707 lines
24 KiB
C#
707 lines
24 KiB
C#
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using System.ComponentModel;
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using System.ComponentModel.DataAnnotations;
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using System.Data.Spatial;
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using System.Diagnostics;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.Linq;
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using System.Reflection;
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using System.Web.DynamicData.ModelProviders;
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using System.Web.DynamicData.Util;
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namespace System.Web.DynamicData {
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/// <summary>
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/// Object that represents a database column used by dynamic data
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/// </summary>
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public class MetaColumn : IFieldFormattingOptions, IMetaColumn {
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private TypeCode _typeCode = TypeCode.Empty;
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private Type _type;
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private object _metadataCacheLock = new object();
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// text, ntext, varchar(max), nvarchar(max) all have different maximum lengths so this is a minimum value
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// that ensures that all of the abovementioned columns get treated as long strings.
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private static readonly int s_longStringLengthCutoff = ((Int32.MaxValue >> 1) - 4);
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// Metadata related members
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private IMetaColumnMetadata _metadata;
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private bool? _scaffoldValueManual;
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private bool? _scaffoldValueDefault;
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public MetaColumn(MetaTable table, ColumnProvider columnProvider) {
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Table = table;
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Provider = columnProvider;
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}
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/// <summary>
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/// The collection of metadata attributes that apply to this column
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/// </summary>
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public AttributeCollection Attributes {
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get {
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return Metadata.Attributes;
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}
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}
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/// <summary>
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/// The CLR type of the property/column
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/// </summary>
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public Type ColumnType {
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get {
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if (_type == null) {
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// If it's an Nullable<T>, work with T instead
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_type = Misc.RemoveNullableFromType(Provider.ColumnType);
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}
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return _type;
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}
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}
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/// <summary>
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/// The DataTypeAttribute used for the column
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/// </summary>
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public DataTypeAttribute DataTypeAttribute {
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get {
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return Metadata.DataTypeAttribute;
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}
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}
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/// <summary>
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/// This column's defalut value. It is typically used to populate the field when creating a new entry.
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/// </summary>
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public object DefaultValue {
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get {
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return Metadata.DefaultValue;
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}
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}
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/// <summary>
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/// A description for this column
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/// </summary>
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public virtual string Description {
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get {
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//
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return Metadata.Description;
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}
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}
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/// <summary>
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/// A friendly display name for this column
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/// </summary>
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public virtual string DisplayName {
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get {
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// Default to the Name if there is no DisplayName
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return Metadata.DisplayName ?? Name;
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}
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}
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/// <summary>
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/// The PropertyInfo of the property that represents this column on the entity type
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/// </summary>
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public PropertyInfo EntityTypeProperty { get { return Provider.EntityTypeProperty; } }
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/// <summary>
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/// The FilterUIHint used for the column
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/// </summary>
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public string FilterUIHint {
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get {
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return Metadata.FilterUIHint;
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}
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}
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/// <summary>
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/// Does this column contain binary data
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/// </summary>
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public bool IsBinaryData {
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get {
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return ColumnType == typeof(byte[]);
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}
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}
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/// <summary>
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/// meant to indicate that a member is an extra property that was declared in a partial class
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/// </summary>
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public bool IsCustomProperty { get { return Provider.IsCustomProperty; } }
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/// <summary>
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/// Is this column a floating point type (float, double, decimal)
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/// </summary>
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public bool IsFloatingPoint {
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get {
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return ColumnType == typeof(float) || ColumnType == typeof(double) || ColumnType == typeof(decimal);
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}
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}
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/// <summary>
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/// This is set for columns that are part of a foreign key. Note that it is NOT set for
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/// the strongly typed entity ref columns (though those columns 'use' one or more columns
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/// where IsForeignKeyComponent is set).
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/// </summary>
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public bool IsForeignKeyComponent {
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get { return Provider.IsForeignKeyComponent; }
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}
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/// <summary>
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/// Is this column's value auto-generated in the database
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/// </summary>
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public bool IsGenerated { get { return Provider.IsGenerated; } }
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/// <summary>
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/// Is this column a integer
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/// </summary>
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public bool IsInteger {
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get {
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return ColumnType == typeof(byte) || ColumnType == typeof(short) || ColumnType == typeof(int) || ColumnType == typeof(long);
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}
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}
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/// <summary>
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/// Is this column a 'long' string. This is used to determine whether a textbox or textarea should be used.
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/// </summary>
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public bool IsLongString {
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get {
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return IsString && Provider.MaxLength >= s_longStringLengthCutoff;
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}
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}
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/// <summary>
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/// Is this column part if the table's primary key
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/// </summary>
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public bool IsPrimaryKey { get { return Provider.IsPrimaryKey; } }
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/// <summary>
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/// Is this a readonly column
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/// </summary>
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[SuppressMessage("Microsoft.Security", "CA2119:SealMethodsThatSatisfyPrivateInterfaces",
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Justification = "Interface denotes existence of property, not used for security.")]
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public virtual bool IsReadOnly {
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get {
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return Provider.IsReadOnly || Metadata.IsReadOnly ||
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(Metadata.EditableAttribute != null && !Metadata.EditableAttribute.AllowEdit);
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}
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}
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/// <summary>
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/// Specifies if a read-only column (see IsReadOnly) allows for a value to be set on insert.
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/// The default value is false when the column is read-only; true when the column is not read-only.
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/// The default value can be override by using EditableAttribute (note that this will indicate that
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/// the column is meant to be read only).
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/// </summary>
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public bool AllowInitialValue {
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get {
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if (IsGenerated) {
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// always return false for generated columns, since that is a stronger statement.
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return false;
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}
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return Metadata.EditableAttribute.GetPropertyValue(a => a.AllowInitialValue, !IsReadOnly);
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}
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}
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/// <summary>
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/// Does this column require a value
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/// </summary>
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public bool IsRequired {
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get {
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return Metadata.RequiredAttribute != null;
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}
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}
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/// <summary>
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/// Is this column a string
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/// </summary>
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public bool IsString {
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get {
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return ColumnType == typeof(string);
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}
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}
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/// <summary>
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/// The maximun length allowed for this column (applies to string columns)
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/// </summary>
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public int MaxLength {
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get {
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var stringLengthAttribute = Metadata.StringLengthAttribute;
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return stringLengthAttribute != null ? stringLengthAttribute.MaximumLength : Provider.MaxLength;
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}
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}
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/// <summary>
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/// The MetaModel that this column belongs to
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/// </summary>
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public MetaModel Model { get { return Table.Model; } }
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/// <summary>
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/// The column's name
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/// </summary>
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public string Name { get { return Provider.Name; } }
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/// <summary>
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/// A value that can be used as a watermark in UI bound to value represented by this column.
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/// </summary>
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public virtual string Prompt { get { return Metadata.Prompt; } }
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/// <summary>
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/// the abstraction provider object that was used to construct this metacolumn.
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/// </summary>
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public ColumnProvider Provider { get; private set; }
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/// <summary>
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/// The error message used if this column is required and it is set to empty
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/// </summary>
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public string RequiredErrorMessage {
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get {
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var requiredAttribute = Metadata.RequiredAttribute;
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return requiredAttribute != null ? requiredAttribute.FormatErrorMessage(DisplayName) : String.Empty;
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}
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}
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/// <summary>
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/// Is it a column that should be displayed (e.g. in a GridView's auto generate mode)
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/// </summary>
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[SuppressMessage("Microsoft.Security", "CA2119:SealMethodsThatSatisfyPrivateInterfaces",
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Justification = "Interface denotes existence of property, not used for security.")]
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public virtual bool Scaffold {
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get {
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// If the value was explicitely set, that always takes precedence
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if (_scaffoldValueManual != null) {
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return _scaffoldValueManual.Value;
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}
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// If there is a DisplayAttribute with an explicit value, always honor it
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var displayAttribute = Metadata.DisplayAttribute;
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if (displayAttribute != null && displayAttribute.GetAutoGenerateField().HasValue) {
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return displayAttribute.GetAutoGenerateField().Value;
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}
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// If there is an explicit Scaffold attribute, always honor it
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var scaffoldAttribute = Metadata.ScaffoldColumnAttribute;
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if (scaffoldAttribute != null) {
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return scaffoldAttribute.Scaffold;
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}
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if (_scaffoldValueDefault == null) {
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_scaffoldValueDefault = ScaffoldNoCache;
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}
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return _scaffoldValueDefault.Value;
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}
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set {
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_scaffoldValueManual = value;
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}
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}
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/// <summary>
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/// Look at various pieces of data on the column to determine whether it's
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/// Scaffold mode should be on. This only gets called once per column and the result
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/// is cached
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/// </summary>
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internal virtual bool ScaffoldNoCache {
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get {
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// Any field with a UIHint should be included
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if (!String.IsNullOrEmpty(UIHint)) return true;
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// Skip columns that are part of a foreign key, since they are already 'covered' in the
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// strongly typed foreign key column
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if (IsForeignKeyComponent) return false;
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// Skip generated columns, which are not typically interesting
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if (IsGenerated) return false;
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// Always include non-generated primary keys
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if (IsPrimaryKey) return true;
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// Skip custom properties
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if (IsCustomProperty) return false;
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// Include strings and characters
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if (IsString) return true;
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if (ColumnType == typeof(char)) return true;
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// Include numbers
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if (IsInteger) return true;
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if (IsFloatingPoint) return true;
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// Include date related columns
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if (ColumnType == typeof(DateTime)) return true;
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if (ColumnType == typeof(TimeSpan)) return true;
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if (ColumnType == typeof(DateTimeOffset)) return true;
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// Include bools
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if (ColumnType == typeof(bool)) return true;
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// Include enums
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Type enumType;
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if (this.IsEnumType(out enumType)) return true;
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//Include spatial types
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if (ColumnType == typeof(DbGeography)) return true;
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if (ColumnType == typeof(DbGeometry)) return true;
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return false;
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}
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}
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/// <summary>
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/// A friendly short display name for this column. Meant to be used in GridView and similar controls where there might be
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/// limited column header space
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/// </summary>
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public virtual string ShortDisplayName {
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get {
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// Default to the DisplayName if there is no ShortDisplayName
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return Metadata.ShortDisplayName ?? DisplayName;
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}
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}
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/// <summary>
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/// The expression used to determine the sort order for this column
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/// </summary>
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public string SortExpression {
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get {
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return SortExpressionInternal;
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}
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}
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internal virtual string SortExpressionInternal {
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get {
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return Provider.IsSortable ? Name : string.Empty;
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}
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}
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/// <summary>
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/// The MetaTable that this column belongs to
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/// </summary>
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public MetaTable Table { get; private set; }
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/// <summary>
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/// The TypeCode of this column. It is derived from the ColumnType
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/// </summary>
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public TypeCode TypeCode {
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get {
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if (_typeCode == TypeCode.Empty) {
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_typeCode = DataSourceUtil.TypeCodeFromType(ColumnType);
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}
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return _typeCode;
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}
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}
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/// <summary>
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/// The UIHint used for the column
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/// </summary>
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[SuppressMessage("Microsoft.Security", "CA2119:SealMethodsThatSatisfyPrivateInterfaces",
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Justification = "Interface denotes existence of property, not used for security.")]
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public virtual string UIHint {
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get {
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return Metadata.UIHint;
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}
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}
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#region IFieldFormattingOptions Members
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/// <summary>
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/// Same semantic as the same property on System.Web.UI.WebControls.BoundField
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/// </summary>
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public bool ApplyFormatInEditMode {
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get {
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return Metadata.ApplyFormatInEditMode;
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}
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}
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/// <summary>
|
||
|
|
/// Same semantic as the same property on System.Web.UI.WebControls.BoundField
|
||
|
|
/// </summary>
|
||
|
|
public bool ConvertEmptyStringToNull {
|
||
|
|
get {
|
||
|
|
return Metadata.ConvertEmptyStringToNull;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Same semantic as the same property on System.Web.UI.WebControls.BoundField
|
||
|
|
/// </summary>
|
||
|
|
public string DataFormatString {
|
||
|
|
get {
|
||
|
|
return Metadata.DataFormatString;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Same semantic as the same property on System.Web.UI.WebControls.BoundField
|
||
|
|
/// </summary>
|
||
|
|
public bool HtmlEncode {
|
||
|
|
get {
|
||
|
|
return Metadata.HtmlEncode;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Same semantic as the same property on System.Web.UI.WebControls.BoundField
|
||
|
|
/// </summary>
|
||
|
|
public string NullDisplayText {
|
||
|
|
get {
|
||
|
|
return Metadata.NullDisplayText;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Build the attribute collection, later made available through the Attributes property
|
||
|
|
/// </summary>
|
||
|
|
protected virtual AttributeCollection BuildAttributeCollection() {
|
||
|
|
return Provider.Attributes;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Perform initialization logic for this column
|
||
|
|
/// </summary>
|
||
|
|
internal protected virtual void Initialize() { }
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Resets cached column metadata (i.e. information coming from attributes). The metadata cache will be rebuilt
|
||
|
|
/// the next time any metadata-derived information gets requested.
|
||
|
|
/// </summary>
|
||
|
|
public void ResetMetadata() {
|
||
|
|
_metadata = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Shows the column name. Mostly for debugging purpose.
|
||
|
|
/// </summary>
|
||
|
|
[SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")]
|
||
|
|
public override string ToString() {
|
||
|
|
return GetType().Name + " " + Name;
|
||
|
|
}
|
||
|
|
|
||
|
|
internal IMetaColumnMetadata Metadata {
|
||
|
|
get {
|
||
|
|
// Use a local to avoid returning null if ResetMetadata is called
|
||
|
|
IMetaColumnMetadata metadata = _metadata;
|
||
|
|
if (metadata == null) {
|
||
|
|
metadata = new MetaColumnMetadata(this);
|
||
|
|
_metadata = metadata;
|
||
|
|
}
|
||
|
|
return metadata;
|
||
|
|
}
|
||
|
|
set {
|
||
|
|
// settable for unit testing
|
||
|
|
_metadata = value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#region Metadata abstraction
|
||
|
|
|
||
|
|
internal interface IMetaColumnMetadata {
|
||
|
|
|
||
|
|
AttributeCollection Attributes { get; }
|
||
|
|
|
||
|
|
DisplayAttribute DisplayAttribute { get; }
|
||
|
|
|
||
|
|
bool ApplyFormatInEditMode { get; }
|
||
|
|
|
||
|
|
bool ConvertEmptyStringToNull { get; }
|
||
|
|
|
||
|
|
bool HtmlEncode { get; }
|
||
|
|
|
||
|
|
string DataFormatString { get; }
|
||
|
|
|
||
|
|
DataTypeAttribute DataTypeAttribute { get; }
|
||
|
|
|
||
|
|
object DefaultValue { get; }
|
||
|
|
|
||
|
|
string Description { get; }
|
||
|
|
|
||
|
|
string DisplayName { get; }
|
||
|
|
|
||
|
|
string FilterUIHint { get; }
|
||
|
|
|
||
|
|
string ShortDisplayName { get; }
|
||
|
|
|
||
|
|
string NullDisplayText { get; }
|
||
|
|
|
||
|
|
string Prompt { get; }
|
||
|
|
|
||
|
|
RequiredAttribute RequiredAttribute { get; }
|
||
|
|
|
||
|
|
ScaffoldColumnAttribute ScaffoldColumnAttribute { get; }
|
||
|
|
|
||
|
|
StringLengthAttribute StringLengthAttribute { get; }
|
||
|
|
|
||
|
|
string UIHint { get; }
|
||
|
|
|
||
|
|
bool IsReadOnly { get; }
|
||
|
|
|
||
|
|
EditableAttribute EditableAttribute { get; }
|
||
|
|
}
|
||
|
|
|
||
|
|
internal class MetaColumnMetadata : IMetaColumnMetadata {
|
||
|
|
private MetaColumn Column { get; set; }
|
||
|
|
|
||
|
|
public AttributeCollection Attributes { get; private set; }
|
||
|
|
|
||
|
|
public MetaColumnMetadata(MetaColumn column) {
|
||
|
|
Debug.Assert(column != null);
|
||
|
|
Column = column;
|
||
|
|
|
||
|
|
Attributes = Column.BuildAttributeCollection();
|
||
|
|
|
||
|
|
DisplayAttribute = Attributes.FirstOrDefault<DisplayAttribute>();
|
||
|
|
DataTypeAttribute = Attributes.FirstOrDefault<DataTypeAttribute>() ?? GetDefaultDataTypeAttribute();
|
||
|
|
DescriptionAttribute = Attributes.FirstOrDefault<DescriptionAttribute>();
|
||
|
|
DefaultValueAttribute = Attributes.FirstOrDefault<DefaultValueAttribute>();
|
||
|
|
DisplayNameAttribute = Attributes.FirstOrDefault<DisplayNameAttribute>();
|
||
|
|
RequiredAttribute = Attributes.FirstOrDefault<RequiredAttribute>();
|
||
|
|
ScaffoldColumnAttribute = Attributes.FirstOrDefault<ScaffoldColumnAttribute>();
|
||
|
|
StringLengthAttribute = Attributes.FirstOrDefault<StringLengthAttribute>();
|
||
|
|
|
||
|
|
UIHint = GetHint<UIHintAttribute>(a => a.PresentationLayer, a => a.UIHint);
|
||
|
|
FilterUIHint = GetHint<FilterUIHintAttribute>(a => a.PresentationLayer, a => a.FilterUIHint);
|
||
|
|
|
||
|
|
EditableAttribute = Attributes.FirstOrDefault<EditableAttribute>();
|
||
|
|
IsReadOnly = Attributes.GetAttributePropertyValue<ReadOnlyAttribute, bool>(a => a.IsReadOnly, false);
|
||
|
|
|
||
|
|
var displayFormatAttribute = Attributes.FirstOrDefault<DisplayFormatAttribute>() ??
|
||
|
|
(DataTypeAttribute != null ? DataTypeAttribute.DisplayFormat : null);
|
||
|
|
|
||
|
|
ApplyFormatInEditMode = displayFormatAttribute.GetPropertyValue(a => a.ApplyFormatInEditMode, false);
|
||
|
|
ConvertEmptyStringToNull = displayFormatAttribute.GetPropertyValue(a => a.ConvertEmptyStringToNull, true);
|
||
|
|
DataFormatString = displayFormatAttribute.GetPropertyValue(a => a.DataFormatString, String.Empty);
|
||
|
|
NullDisplayText = displayFormatAttribute.GetPropertyValue(a => a.NullDisplayText, String.Empty);
|
||
|
|
HtmlEncode = displayFormatAttribute.GetPropertyValue(a => a.HtmlEncode, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
public DisplayAttribute DisplayAttribute { get; private set; }
|
||
|
|
|
||
|
|
public bool ApplyFormatInEditMode { get; private set; }
|
||
|
|
|
||
|
|
public bool ConvertEmptyStringToNull { get; private set; }
|
||
|
|
|
||
|
|
public string DataFormatString { get; private set; }
|
||
|
|
|
||
|
|
public DataTypeAttribute DataTypeAttribute { get; private set; }
|
||
|
|
|
||
|
|
public object DefaultValue {
|
||
|
|
get {
|
||
|
|
return DefaultValueAttribute.GetPropertyValue(a => a.Value, null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private DefaultValueAttribute DefaultValueAttribute { get; set; }
|
||
|
|
|
||
|
|
public string Description {
|
||
|
|
get {
|
||
|
|
return DisplayAttribute.GetPropertyValue(a => a.GetDescription(), null) ??
|
||
|
|
DescriptionAttribute.GetPropertyValue(a => a.Description, null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private DescriptionAttribute DescriptionAttribute { get; set; }
|
||
|
|
|
||
|
|
public string DisplayName {
|
||
|
|
get {
|
||
|
|
return DisplayAttribute.GetPropertyValue(a => a.GetName(), null) ??
|
||
|
|
DisplayNameAttribute.GetPropertyValue(a => a.DisplayName, null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public string ShortDisplayName {
|
||
|
|
get {
|
||
|
|
return DisplayAttribute.GetPropertyValue(a => a.GetShortName(), null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private DisplayNameAttribute DisplayNameAttribute { get; set; }
|
||
|
|
|
||
|
|
public string FilterUIHint { get; private set; }
|
||
|
|
|
||
|
|
public EditableAttribute EditableAttribute { get; private set; }
|
||
|
|
|
||
|
|
public bool IsReadOnly { get; private set; }
|
||
|
|
|
||
|
|
public string NullDisplayText { get; private set; }
|
||
|
|
|
||
|
|
public string Prompt {
|
||
|
|
get {
|
||
|
|
return DisplayAttribute.GetPropertyValue(a => a.GetPrompt(), null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public RequiredAttribute RequiredAttribute { get; private set; }
|
||
|
|
|
||
|
|
public ScaffoldColumnAttribute ScaffoldColumnAttribute { get; private set; }
|
||
|
|
|
||
|
|
public StringLengthAttribute StringLengthAttribute { get; private set; }
|
||
|
|
|
||
|
|
public string UIHint { get; private set; }
|
||
|
|
|
||
|
|
private DataTypeAttribute GetDefaultDataTypeAttribute() {
|
||
|
|
if (Column.IsString) {
|
||
|
|
if (Column.IsLongString) {
|
||
|
|
return new DataTypeAttribute(DataType.MultilineText);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
return new DataTypeAttribute(DataType.Text);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
private string GetHint<T>(Func<T, string> presentationLayerPropertyAccessor, Func<T, string> hintPropertyAccessor) where T : Attribute {
|
||
|
|
var uiHints = Attributes.OfType<T>();
|
||
|
|
var presentationLayerNotSpecified = uiHints.Where(a => String.IsNullOrEmpty(presentationLayerPropertyAccessor(a)));
|
||
|
|
var presentationLayerSpecified = uiHints.Where(a => !String.IsNullOrEmpty(presentationLayerPropertyAccessor(a)));
|
||
|
|
|
||
|
|
T uiHintAttribute = presentationLayerSpecified.FirstOrDefault(a => presentationLayerPropertyAccessor(a).ToLower(CultureInfo.InvariantCulture) == "webforms" ||
|
||
|
|
presentationLayerPropertyAccessor(a).ToLower(CultureInfo.InvariantCulture) == "mvc") ??
|
||
|
|
presentationLayerNotSpecified.FirstOrDefault();
|
||
|
|
|
||
|
|
return uiHintAttribute.GetPropertyValue(hintPropertyAccessor);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
public bool HtmlEncode {
|
||
|
|
get; set;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
|
||
|
|
string IMetaColumn.Description {
|
||
|
|
get {
|
||
|
|
return Description;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
string IMetaColumn.DisplayName {
|
||
|
|
get {
|
||
|
|
return DisplayName;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
string IMetaColumn.Prompt {
|
||
|
|
get {
|
||
|
|
return Prompt;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
string IMetaColumn.ShortDisplayName {
|
||
|
|
get {
|
||
|
|
return ShortDisplayName;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
IMetaTable IMetaColumn.Table {
|
||
|
|
get {
|
||
|
|
return Table;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
IMetaModel IMetaColumn.Model {
|
||
|
|
get {
|
||
|
|
return Model;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|