67 lines
2.2 KiB
C#
67 lines
2.2 KiB
C#
namespace System.Web.UI.WebControls.Expressions {
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using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Linq.Expressions;
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using System.Web.UI.WebControls;
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[
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PersistChildren(false),
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ParseChildren(true, "Parameters")
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]
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public abstract class ParameterDataSourceExpression : DataSourceExpression {
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private ParameterCollection _parameters;
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[PersistenceMode(PersistenceMode.InnerDefaultProperty)]
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public ParameterCollection Parameters {
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get {
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if (_parameters == null) {
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_parameters = new ParameterCollection();
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_parameters.ParametersChanged += new EventHandler(OnParametersChanged);
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}
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return _parameters;
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}
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}
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internal virtual IDictionary<string, object> GetValues() {
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return Parameters.ToDictionary(Context, Owner);
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}
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public override void SetContext(Control owner, HttpContext context, IQueryableDataSource dataSource) {
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base.SetContext(owner, context, dataSource);
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owner.Page.LoadComplete += new EventHandler(OnPageLoadComplete);
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}
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private void OnParametersChanged(object sender, EventArgs e) {
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if (DataSource != null) {
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DataSource.RaiseViewChanged();
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}
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}
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private void OnPageLoadComplete(object sender, System.EventArgs e) {
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Parameters.UpdateValues(Context, Owner);
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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 = DataSourceHelper.SaveViewState(_parameters);
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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)Parameters).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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DataSourceHelper.TrackViewState(_parameters);
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}
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}
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}
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