74 lines
3.1 KiB
C#
74 lines
3.1 KiB
C#
using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Data.Metadata.Edm;
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using System.Data.Objects;
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using System.Linq;
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using System.Reflection;
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namespace System.Web.DynamicData.ModelProviders {
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internal sealed class EFTableProvider : TableProvider {
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private ReadOnlyCollection<ColumnProvider> _roColumns;
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public EFTableProvider(EFDataModelProvider dataModel, EntitySet entitySet, EntityType entityType,
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Type entityClrType, Type parentEntityClrType, Type rootEntityClrType, string name)
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: base(dataModel) {
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EntityType = entityClrType;
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Name = name;
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DataContextPropertyName = entitySet.Name;
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ParentEntityType = parentEntityClrType;
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RootEntityType = rootEntityClrType;
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var genericMethod = DataModel.ContextType.GetMethod("CreateQuery");
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CreateQueryMethod = genericMethod.MakeGenericMethod(EntityType);
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CreateQueryString = CreateEntitySqlQueryString(entitySet);
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var keyMembers = entityType.KeyMembers;
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// columns (entity properties)
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// note 1: keys are also available through es.ElementType.KeyMembers
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// note 2: this includes "nav properties", kind of fancy, two-way relationship objects
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var columns = new List<ColumnProvider>();
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foreach (EdmMember m in entityType.Members) {
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if (EFColumnProvider.IsSupportedEdmMemberType(m) && IsPublicProperty(entityClrType, m.Name)) {
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EFColumnProvider entityMember = new EFColumnProvider(entityType, this, m, keyMembers.Contains(m));
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columns.Add(entityMember);
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}
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}
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_roColumns = new ReadOnlyCollection<ColumnProvider>(columns);
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}
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private static bool IsPublicProperty(Type entityClrType, string propertyName) {
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var property = entityClrType.GetProperty(propertyName);
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return property != null && property.GetGetMethod() != null;
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}
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private MethodInfo CreateQueryMethod { get; set; }
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private string CreateQueryString { get; set; }
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private static string CreateEntitySqlQueryString(EntitySet entitySet) {
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// Qualify the entity set name with the container name (in case the ObjectContext's default
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// container name is not set or has an unexpected value)
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return QuoteEntitySqlIdentifier(entitySet.EntityContainer.Name) + "." + QuoteEntitySqlIdentifier(entitySet.Name);
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}
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private static string QuoteEntitySqlIdentifier(string identifier) {
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// Enclose in square brackets and escape the one reserved character (])
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return "[" + identifier.Replace("]", "]]") + "]";
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}
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public override ReadOnlyCollection<ColumnProvider> Columns {
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get {
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return _roColumns;
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}
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}
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public override IQueryable GetQuery(object context) {
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return (IQueryable)CreateQueryMethod.Invoke(context,
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new object[] { CreateQueryString, new ObjectParameter[0] });
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}
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}
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}
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