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