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namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Resources;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Web.UI.WebControls.Expressions;
[
ParseChildren(true),
PersistChildren(false)
]
public abstract class QueryableDataSource : DataSourceControl, IQueryableDataSource {
private const string DefaultViewName = "DefaultView";
private ReadOnlyCollection<string> _viewNames;
private QueryableDataSourceView _view;
private readonly new IPage _page;
internal QueryableDataSource(IPage page) {
_page = page;
}
internal QueryableDataSource(QueryableDataSourceView view) {
_view = view;
}
protected QueryableDataSource() {
}
[SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods", Justification="View is used by derived types")]
private QueryableDataSourceView View {
get {
if (_view == null) {
_view = CreateQueryableView();
}
return _view;
}
}
internal IPage IPage {
get {
if (_page != null) {
return _page;
}
else {
Page page = Page;
if (page == null) {
throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull);
}
return new PageWrapper(page);
}
}
}
protected abstract QueryableDataSourceView CreateQueryableView();
protected override ICollection GetViewNames() {
if (_viewNames == null) {
_viewNames = new ReadOnlyCollection<string>(new[] { DefaultViewName });
}
return _viewNames;
}
protected override DataSourceView GetView(string viewName) {
if (viewName == null) {
throw new ArgumentNullException("viewName");
}
// viewName comes from the DataMember property on the databound control and is an empty string
// by default. An empty string should be treated as if it were the default view name.
if ((viewName.Length != 0) &&
!String.Equals(viewName, DefaultViewName, StringComparison.OrdinalIgnoreCase)) {
throw new ArgumentException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSource_InvalidViewName, ID, DefaultViewName), "viewName");
}
return View;
}
[SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")]
protected internal override void OnInit(EventArgs e) {
base.OnInit(e);
IPage.LoadComplete += new EventHandler(OnPageLoadComplete);
}
// Used for unit testing only
internal void SetView(QueryableDataSourceView view) {
_view = view;
}
protected virtual void UpdateParameterVales() {
View.WhereParameters.UpdateValues(Context, this);
View.OrderGroupsByParameters.UpdateValues(Context, this);
View.GroupByParameters.UpdateValues(Context, this);
View.OrderByParameters.UpdateValues(Context, this);
View.SelectNewParameters.UpdateValues(Context, this);
}
private void OnPageLoadComplete(object sender, EventArgs e) {
UpdateParameterVales();
}
protected override object SaveViewState() {
Pair myState = new Pair();
myState.First = base.SaveViewState();
if (_view != null) {
myState.Second = ((IStateManager)_view).SaveViewState();
}
if ((myState.First == null) &&
(myState.Second == null)) {
return null;
}
return myState;
}
protected override void TrackViewState() {
base.TrackViewState();
if (_view != null) {
((IStateManager)_view).TrackViewState();
}
}
protected override void LoadViewState(object savedState) {
if (savedState == null) {
base.LoadViewState(null);
}
else {
Pair myState = (Pair)savedState;
base.LoadViewState(myState.First);
if (myState.Second != null) {
((IStateManager)View).LoadViewState(myState.Second);
}
}
}
#region IQueryableDataSource Members
public void RaiseViewChanged() {
View.RaiseViewChanged();
}
public event EventHandler<QueryCreatedEventArgs> QueryCreated {
add {
View.QueryCreated += value;
}
remove {
View.QueryCreated -= value;
}
}
#endregion
}
}
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