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