129 lines
4.3 KiB
C#
129 lines
4.3 KiB
C#
//------------------------------------------------------------------------------
|
|
// <copyright file="ListSourceHelper.cs" company="Microsoft">
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
// </copyright>
|
|
//------------------------------------------------------------------------------
|
|
|
|
namespace System.Web.UI {
|
|
|
|
using System.Collections;
|
|
using System.ComponentModel;
|
|
|
|
public static class ListSourceHelper {
|
|
|
|
public static bool ContainsListCollection(IDataSource dataSource) {
|
|
ICollection viewNames = dataSource.GetViewNames();
|
|
if (viewNames != null && viewNames.Count > 0) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
public static IList GetList(IDataSource dataSource) {
|
|
ICollection viewNames = dataSource.GetViewNames();
|
|
|
|
if (viewNames != null && viewNames.Count > 0) {
|
|
return new ListSourceList(dataSource);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
internal sealed class ListSourceList : CollectionBase, ITypedList {
|
|
IDataSource _dataSource;
|
|
|
|
public ListSourceList(IDataSource dataSource) {
|
|
_dataSource = dataSource;
|
|
((IList)this).Add(new ListSourceRow(_dataSource));
|
|
}
|
|
|
|
#region ITypedList implementation
|
|
string ITypedList.GetListName(PropertyDescriptor[] listAccessors) {
|
|
return String.Empty;
|
|
}
|
|
|
|
PropertyDescriptorCollection ITypedList.GetItemProperties(PropertyDescriptor[] listAccessors) {
|
|
if (_dataSource != null) {
|
|
ICollection viewNames = _dataSource.GetViewNames();
|
|
if (viewNames != null && viewNames.Count > 0) {
|
|
string[] viewNamesArray = new string[viewNames.Count];
|
|
viewNames.CopyTo(viewNamesArray, 0);
|
|
PropertyDescriptor[] props = new PropertyDescriptor[viewNames.Count];
|
|
for (int i = 0; i < viewNamesArray.Length; i++) {
|
|
props[i] = new ListSourcePropertyDescriptor(viewNamesArray[i]);
|
|
}
|
|
return new PropertyDescriptorCollection(props);
|
|
}
|
|
}
|
|
return new PropertyDescriptorCollection(null);
|
|
}
|
|
#endregion ITypedList implementations
|
|
}
|
|
|
|
internal class ListSourceRow {
|
|
IDataSource _dataSource;
|
|
|
|
public ListSourceRow(IDataSource dataSource) {
|
|
_dataSource = dataSource;
|
|
}
|
|
|
|
public IDataSource DataSource {
|
|
get {
|
|
return _dataSource;
|
|
}
|
|
}
|
|
}
|
|
|
|
internal class ListSourcePropertyDescriptor : PropertyDescriptor {
|
|
string _name;
|
|
|
|
public ListSourcePropertyDescriptor(string name) : base(name, null) {
|
|
_name = name;
|
|
}
|
|
|
|
public override Type ComponentType {
|
|
get {
|
|
return typeof(ListSourceRow);
|
|
}
|
|
}
|
|
|
|
public override bool IsReadOnly {
|
|
get {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public override Type PropertyType {
|
|
get {
|
|
return typeof(IEnumerable);
|
|
}
|
|
}
|
|
|
|
public override bool CanResetValue(object value) {
|
|
return false;
|
|
}
|
|
|
|
public override object GetValue(object source) {
|
|
if (source is ListSourceRow) {
|
|
ListSourceRow row = (ListSourceRow)source;
|
|
IDataSource dataSource = row.DataSource;
|
|
return dataSource.GetView(_name).ExecuteSelect(DataSourceSelectArguments.Empty);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public override void ResetValue(object component) {
|
|
throw new NotSupportedException();
|
|
}
|
|
|
|
public override void SetValue(object component, object value) {
|
|
throw new NotSupportedException();
|
|
}
|
|
|
|
public override bool ShouldSerializeValue(object component) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|