QueryableFilterRepeater.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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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