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namespace System.Web.UI.WebControls {
using System.Web.UI.WebControls.Expressions;
using System;
using System.ComponentModel;
using System.Drawing;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Security.Permissions;
using System.Web.UI;
using System.Web.Resources;
[TargetControlType(typeof(IQueryableDataSource))]
[NonVisualControl()]
[DefaultProperty("TargetControlID")]
[ToolboxBitmap(typeof(QueryExtender), "QueryExtender.bmp")]
[Designer("System.Web.UI.Design.QueryExtenderDesigner, " + AssemblyRef.SystemWebExtensionsDesign)]
[ParseChildren(true, "Expressions")]
[PersistChildren(false)]
public class QueryExtender : Control {
private QueryExpression _query;
private string _targetControlID;
private IQueryableDataSource _dataSource;
public QueryExtender() {
}
internal QueryExtender(IQueryableDataSource dataSource) {
_dataSource = dataSource;
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public virtual IQueryableDataSource DataSource {
get {
if (_dataSource == null) {
if (String.IsNullOrEmpty(TargetControlID)) {
throw new InvalidOperationException(AtlasWeb.DataSourceControlExtender_TargetControlIDMustBeSpecified);
}
_dataSource = DataBoundControlHelper.FindControl(this, TargetControlID) as IQueryableDataSource;
//
if (_dataSource == null) {
throw new InvalidOperationException(
String.Format(CultureInfo.CurrentCulture,
AtlasWeb.QueryExtender_DataSourceMustBeIQueryableDataSource,
TargetControlID));
}
}
return _dataSource;
}
}
[
Category("Behavior"),
ResourceDescription("QueryExtender_Expressions"),
PersistenceMode(PersistenceMode.InnerDefaultProperty),
]
public DataSourceExpressionCollection Expressions {
get {
return Query.Expressions;
}
}
[
Category("Behavior"),
DefaultValue(""),
IDReferenceProperty,
ResourceDescription("ExtenderControl_TargetControlID"),
SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "ID"),
]
public virtual string TargetControlID {
get {
return _targetControlID ?? String.Empty;
}
set {
if (_targetControlID != value) {
_dataSource = null;
_targetControlID = value;
}
}
}
private QueryExpression Query {
get {
if (_query == null) {
_query = new QueryExpression();
}
return _query;
}
}
[SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")]
protected internal override void OnInit(EventArgs e) {
if (!DesignMode) {
DataSource.QueryCreated += new EventHandler<QueryCreatedEventArgs>(OnDataSourceQueryCreated);
// Initialize the Query
Query.Initialize(this, Context, DataSource);
}
base.OnInit(e);
}
private void OnDataSourceQueryCreated(object sender, QueryCreatedEventArgs e) {
e.Query = Query.GetQueryable(e.Query);
}
protected override object SaveViewState() {
Pair p = new Pair();
p.First = base.SaveViewState();
p.Second = _query != null ? ((IStateManager)_query.Expressions).SaveViewState() : null;
return p;
}
protected override void LoadViewState(object savedState) {
Pair p = (Pair)savedState;
base.LoadViewState(p.First);
if (p.Second != null) {
((IStateManager)Query.Expressions).LoadViewState(p.Second);
}
}
protected override void TrackViewState() {
base.TrackViewState();
if (_query != null) {
((IStateManager)_query.Expressions).TrackViewState();
}
}
}
}
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