107 lines
3.7 KiB
C#
107 lines
3.7 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="DataColumnPropertyDescriptor.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">Microsoft</owner>
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// <owner current="true" primary="false">Microsoft</owner>
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// <owner current="false" primary="false">Microsoft</owner>
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//------------------------------------------------------------------------------
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namespace System.Data {
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using System.Diagnostics;
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using System.ComponentModel;
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using System.Data.Common;
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internal sealed class DataColumnPropertyDescriptor : PropertyDescriptor {
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DataColumn column;
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internal DataColumnPropertyDescriptor(DataColumn dataColumn) : base(dataColumn.ColumnName, null) {
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this.column = dataColumn;
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}
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public override AttributeCollection Attributes {
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get {
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if (typeof(System.Collections.IList).IsAssignableFrom(this.PropertyType)) {
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Attribute[] attrs = new Attribute[base.Attributes.Count + 1];
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base.Attributes.CopyTo(attrs, 0);
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// we don't want to show the columns which are of type IList in the designer
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attrs[attrs.Length - 1] = new ListBindableAttribute(false);
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return new AttributeCollection(attrs);
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} else {
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return base.Attributes;
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}
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}
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}
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internal DataColumn Column {
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get {
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return column;
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}
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}
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public override Type ComponentType {
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get {
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return typeof(DataRowView);
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}
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}
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public override bool IsReadOnly {
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get {
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return column.ReadOnly;
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}
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}
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public override Type PropertyType {
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get {
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return column.DataType;
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}
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}
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public override bool Equals(object other) {
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if (other is DataColumnPropertyDescriptor) {
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DataColumnPropertyDescriptor descriptor = (DataColumnPropertyDescriptor) other;
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return(descriptor.Column == Column);
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}
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return false;
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}
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public override Int32 GetHashCode() {
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return Column.GetHashCode();
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}
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public override bool CanResetValue(object component) {
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DataRowView dataRowView = (DataRowView) component;
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if (!column.IsSqlType)
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return (dataRowView.GetColumnValue(column) != DBNull.Value);
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return (!DataStorage.IsObjectNull(dataRowView.GetColumnValue(column)));
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}
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public override object GetValue(object component) {
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DataRowView dataRowView = (DataRowView) component;
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return dataRowView.GetColumnValue(column);
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}
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public override void ResetValue(object component) {
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DataRowView dataRowView = (DataRowView) component;
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dataRowView.SetColumnValue(column, DBNull.Value);// no need to ccheck for the col type and set Sql...Null!
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}
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public override void SetValue(object component, object value) {
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DataRowView dataRowView = (DataRowView) component;
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dataRowView.SetColumnValue(column, value);
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OnValueChanged(component, EventArgs.Empty);
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}
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public override bool ShouldSerializeValue(object component) {
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return false;
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}
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public override bool IsBrowsable {
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get {
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return (column.ColumnMapping == System.Data.MappingType.Hidden ? false : base.IsBrowsable);
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}
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}
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}
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}
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