Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / QueryableFilterRepeater.cs / 1305376 / QueryableFilterRepeater.cs
using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System.Globalization; using System.Linq; using System.Web.Resources; using System.Web.UI; #if ORYX_VNEXT using Microsoft.Web.Data.UI.WebControls.Expressions; using Microsoft.Web.Data.UI.WebControls; #else using System.Web.UI.WebControls.Expressions; using System.Web.UI.WebControls; #endif namespace System.Web.DynamicData { ////// A templated control that automatically generates a collection of filters for a table associated with a given data source. /// It is designed to work with the QueryExtender architecture and it will not render anything unless it's referenced by a /// DynamicFilterExpression inside of a QueryExtender. /// [ParseChildren(true)] [PersistChildren(false)] public class QueryableFilterRepeater : Control, IFilterExpressionProvider { private HttpContextBase _context; private IQueryableDataSource _dataSource; private List_filters = new List (); private bool _initialized = false; // for unit testing private new HttpContextBase Context { get { return _context ?? new HttpContextWrapper(HttpContext.Current); } } /// /// The ID of a DynamicFilter control inside of the template that will be used configured to be a filter for a particular column. /// The default value is "DynamicFilter" /// [ Category("Behavior"), DefaultValue("DynamicFilter"), Themeable(false), IDReferenceProperty(typeof(QueryableFilterUserControl)), ResourceDescription("DynamicFilterRepeater_DynamicFilterContainerId") ] public string DynamicFilterContainerId { get { string id = ViewState["__FilterContainerId"] as string; return String.IsNullOrEmpty(id) ? "DynamicFilter" : id; } set { ViewState["__FilterContainerId"] = value; } } ////// The template in which the layout of each filter can be specified. Just like ItemTempalte in Repeater. /// [Browsable(false)] [DefaultValue(null)] [PersistenceMode(PersistenceMode.InnerProperty)] [TemplateContainer(typeof(INamingContainer))] public virtual ITemplate ItemTemplate { get; set; } public QueryableFilterRepeater() { } // for unit testing internal QueryableFilterRepeater(HttpContextBase context) : this() { _context = context; } [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")] protected override void OnPreRender(EventArgs e) { if (_filters.Count == 0) { this.Visible = false; } base.OnPreRender(e); } #region IFilterExpressionProvider Members void IFilterExpressionProvider.Initialize(IQueryableDataSource dataSource) { if (dataSource == null) { throw new ArgumentNullException("dataSource"); } if (ItemTemplate == null) { return; } _dataSource = dataSource; Page.InitComplete += new EventHandler(Page_InitComplete); } internal void Page_InitComplete(object sender, EventArgs e) { if (_initialized) { return; } Debug.Assert(_dataSource != null); MetaTable table = DynamicDataExtensions.GetMetaTable(_dataSource, Context); int itemIndex = 0; foreach (MetaColumn column in table.GetFilteredColumns()) { FilterRepeaterItem item = new FilterRepeaterItem() { DataItemIndex = itemIndex, DisplayIndex = itemIndex }; itemIndex++; ItemTemplate.InstantiateIn(item); Controls.Add(item); DynamicFilter filter = item.FindControl(DynamicFilterContainerId) as DynamicFilter; if (filter == null) { throw new InvalidOperationException( String.Format(CultureInfo.CurrentCulture, DynamicDataResources.FilterRepeater_CouldNotFindControlInTemplate, ID, typeof(QueryableFilterUserControl).FullName, DynamicFilterContainerId)); } filter.Context = Context; // needed for unit testing filter.DataField = column.Name; item.DataItem = column; item.DataBind(); item.DataItem = null; // Keep track of all the filters we create _filters.Add(filter); } _filters.ForEach(f => f.Initialize(_dataSource)); _initialized = true; } IQueryable IFilterExpressionProvider.GetQueryable(IQueryable source) { foreach (DynamicFilter filter in _filters) { source = ((IFilterExpressionProvider)filter).GetQueryable(source); } return source; } #endregion private class FilterRepeaterItem : Control, IDataItemContainer { public object DataItem { get; internal set; } public int DataItemIndex { get; internal set; } public int DisplayIndex { get; internal set; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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