DynamicFilter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / DynamicFilter.cs / 1305376 / DynamicFilter.cs
                        
                        
                            using System.ComponentModel; 
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Web.Compilation; 
using System.Web.UI;
using System.Web.UI.WebControls; 
#if !ORYX_VNEXT 
using System.Web.UI.WebControls.Expressions;
using System.Web.Resources; 
#else
using Microsoft.Web.Data.UI.WebControls.Expressions;
using Microsoft.Web.Data.UI.WebControls;
#endif 

namespace System.Web.DynamicData { 
    public class DynamicFilter : Control, IFilterExpressionProvider { 
        private HttpContextBase _context;
        private IQueryableDataSource _dataSource; 
        private Func _filterLoader;
        private QueryableFilterUserControl _filterUserControl;

        protected internal MetaColumn Column { 
            get;
            private set; 
        } 

        ///  
        /// The name of the column that this control handles
        /// 
        [
        Category("Data"), 
        DefaultValue(""),
        ResourceDescription("DynamicFilter_DataField") 
        ] 
        public string DataField {
            get { 
                object o = ViewState["DataField"];
                return (o == null) ? String.Empty : (string)o;
            }
            set { 
                ViewState["DataField"] = value;
            } 
        } 

        ///  
        /// An optional property that can be used to override the column's default default filter UI hint.
        /// 
        [
        Category("Behavior"), 
        DefaultValue(""),
        ResourceDescription("DynamicFilter_FilterUIHint") 
        ] 
        public string FilterUIHint {
            get { 
                object o = ViewState["FilterUIHint"];
                return (o == null) ? String.Empty : (string)o;
            }
            set { 
                ViewState["FilterUIHint"] = value;
            } 
        } 

        public DynamicFilter() 
            : this(CreateUserControl) {
        }

        // internal for unit testing 
        internal DynamicFilter(Func filterLoader) {
            _filterLoader = filterLoader; 
        } 

        // internal for unit testing 
        internal static QueryableFilterUserControl CreateUserControl(MetaColumn column, string filterUiHint) {
            return column.Model.FilterFactory.CreateFilterControl(column, filterUiHint);
        }
 
        internal new HttpContextBase Context {
            get { 
                return _context ?? new HttpContextWrapper(HttpContext.Current); 
            }
            set { 
                _context = value;
            }
        }
 
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 
        public event EventHandler FilterChanged; 

        ///  
        /// Returns the filter template that was created for this control.
        /// 
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 
        public Control FilterTemplate {
            get { 
                return _filterUserControl; 
            }
        } 

        protected override void Render(HtmlTextWriter writer) {
            if (DesignMode) {
                writer.Write("[" + GetType().Name + "]"); 
            }
            else { 
                base.Render(writer); 
            }
        } 

        private void EnsureInit(IQueryableDataSource dataSource) {
            if (_filterUserControl == null) {
                MetaTable table = DynamicDataExtensions.GetMetaTable(dataSource, Context); 
                Column = table.GetColumn(DataField);
                _filterUserControl = _filterLoader(Column, FilterUIHint); 
                _filterUserControl.Initialize(Column, dataSource, Context); 

                _filterUserControl.FilterChanged += new EventHandler(Child_FilterChanged); 

                Controls.Add(_filterUserControl);
            }
        } 

        private void Child_FilterChanged(object sender, EventArgs e) { 
            EventHandler eventHandler = FilterChanged; 
            if (eventHandler != null) {
                eventHandler(sender, e); 
            }
        }

        internal void Initialize(IQueryableDataSource dataSource) { 
            Debug.Assert(dataSource != null);
            EnsureInit(dataSource); 
        } 

        #region IFilterExpressionProvider Members 

        void IFilterExpressionProvider.Initialize(IQueryableDataSource dataSource) {
            if (dataSource == null) {
                throw new ArgumentNullException("dataSource"); 
            }
 
            _dataSource = dataSource; 

            Page.InitComplete += new EventHandler(Page_InitComplete); 
        }

        void Page_InitComplete(object sender, EventArgs e) {
            Debug.Assert(_dataSource != null); 
            EnsureInit(_dataSource);
        } 
 
        IQueryable IFilterExpressionProvider.GetQueryable(IQueryable source) {
            return _filterUserControl.GetQueryable(source); 
        }

        #endregion
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DynamicFilter.cs source code in C# .NET

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