FilterRepeater.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / FilterRepeater.cs / 1305376 / FilterRepeater.cs
                        
                        
                            namespace System.Web.DynamicData { 
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis; 
    using System.Globalization;
    using System.Linq; 
    using System.Security.Permissions; 
    using System.Web;
    using System.Web.Compilation; 
    using System.Web.Resources;
    using System.Web.UI;
    using System.Web.UI.WebControls;
 
    /// 
    /// Repeater Control that enumerates over all the filterable columns in a table 
    ///  
    [ToolboxItem(false)]
    [ParseChildren(true)] 
    public class FilterRepeater : Repeater, IWhereParametersProvider {
        private string _contextTypeName;
        private string _dynamicFilterContainerId;
        private List _filters = new List(); 
        private MetaTable _table;
        private string _tableName; 
 
        /// 
        /// The context that the filtered table belongs to 
        /// 
        [Category("Data"),
        DefaultValue((string)null),
        Themeable(false)] 
        //
        public string ContextTypeName { 
            get { 
                return _contextTypeName ?? String.Empty;
            } 
            set {
                if (!ContextTypeName.Equals(value)) {
                    _contextTypeName = value;
                    _table = null; 
                }
            } 
        } 

        ///  
        /// ID of the filter control in the ItemTemplate. By default, it's "DynamicFilter".
        /// 
        [Category("Behavior"),
        DefaultValue("DynamicFilter"), 
        Themeable(false),
        IDReferenceProperty(typeof(FilterUserControlBase)), 
        ResourceDescription("DynamicFilterRepeater_DynamicFilterContainerId")] 
        public string DynamicFilterContainerId {
            get { 
                if (String.IsNullOrEmpty(_dynamicFilterContainerId)) {
                    _dynamicFilterContainerId = "DynamicFilter";
                }
                return _dynamicFilterContainerId; 
            }
            set { 
                _dynamicFilterContainerId = value; 
            }
        } 

        /// 
        /// Returns the table associated with this filter repeater.
        ///  
        public MetaTable Table {
            get { 
                if (_table == null) { 
                    _table = GetTable();
                } 
                return _table;
            }
        }
 
        /// 
        /// Name of the table being filtered 
        ///  
        [Category("Data"),
        DefaultValue((string)null), 
        Themeable(false),
        ResourceDescription("FilterRepeater_TableName")]
        public string TableName {
            get { 
                return _tableName ?? String.Empty;
            } 
            set { 
                if (!TableName.Equals(value)) {
                    _tableName = value; 
                    _table = null;
                }
            }
        } 

        public override bool Visible { 
            get { 
                //
 

                return base.Visible && _filters.Count > 0;
            }
            set { 
                base.Visible = value;
            } 
        } 

        ///  
        /// same as base.
        /// 
        public override void DataBind() {
            // Start with an empty filters list when DataBinding. This is needed when DataBind() 
            // gets called multiple times.
            _filters.Clear(); 
 
            base.DataBind();
        } 

        /// 
        /// Returns an enumeration of the columns belonging to the table associated with
        /// this filter repeater that are sortable (by default, foreign key and boolean columns) 
        /// that are scaffoldable
        ///  
        ///  
        protected internal virtual IEnumerable GetFilteredColumns() {
            return Table.Columns.Where(c => IsFilterableColumn(c)); 
        }

        internal IEnumerable GetFilterControls() {
            return _filters; 
        }
 
        private MetaTable GetTable() { 
            if (!String.IsNullOrEmpty(ContextTypeName) || !String.IsNullOrEmpty(TableName)) {
                // get table from control properties 

                string contextTypeName = ContextTypeName;
                string tableName = TableName;
 
                if (String.IsNullOrEmpty(ContextTypeName)) {
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, 
                        DynamicDataResources.FilterRepeater_MissingContextTypeName, 
                        ID));
                } else if (String.IsNullOrEmpty(tableName)) { 
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture,
                        DynamicDataResources.FilterRepeater_MissingTableName,
                        ID));
                } 

                Type contextType = null; 
                if (!String.IsNullOrEmpty(ContextTypeName)) { 
                    try {
                        contextType = BuildManager.GetType(contextTypeName, /*throwOnError*/ true, /*ignoreCase*/ true); 
                    } catch (Exception e) {
                        throw new InvalidOperationException(String.Format(
                            CultureInfo.CurrentCulture,
                            DynamicDataResources.FilterRepeater_InvalidContextTypeName, 
                            ID,
                            contextTypeName), e); 
                    } 
                }
                MetaModel model; 
                try {
                     model = MetaModel.GetModel(contextType);
                } catch (InvalidOperationException e) {
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, 
                        DynamicDataResources.FilterRepeater_UnknownContextTypeName,
                        ID, 
                        contextType.FullName), e); 
                }
                try { 
                    return model.GetTable(tableName);
                } catch (ArgumentException e) {
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture,
                        DynamicDataResources.FilterRepeater_InvalidTableName, 
                        ID,
                        tableName), e); 
                } 
            } else {
                MetaTable table = DynamicDataRouteHandler.GetRequestMetaTable(HttpContext.Current); 
                if (table == null) {
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture,
                        DynamicDataResources.FilterRepeater_CantInferInformationFromUrl,
                        ID)); 
                }
                return table; 
            } 
        }
 
        internal static bool IsFilterableColumn(MetaColumn column) {
            if (!column.Scaffold) return false;

            if (column.IsCustomProperty) return false; 

            if (column is MetaForeignKeyColumn) return true; 
 
            if (column.ColumnType == typeof(bool)) return true;
 
            return false;
        }

 
        /// 
        /// gets called for every item and alternating item template being instantiated by this 
        /// repeater during databinding 
        /// 
        ///  
        protected virtual void OnFilterItemCreated(RepeaterItem item) {
            var filter = item.FindControl(DynamicFilterContainerId) as FilterUserControlBase;
            if (filter == null) {
                throw new InvalidOperationException( 
                    String.Format(CultureInfo.CurrentCulture,
                        DynamicDataResources.FilterRepeater_CouldNotFindControlInTemplate, 
                        ID, 
                        typeof(FilterUserControlBase).FullName,
                        DynamicFilterContainerId)); 
            }

            var column = (MetaColumn)item.DataItem;
            filter.TableName = column.Table.Name; 
            filter.DataField = column.Name;
            filter.ContextTypeName = column.Table.DataContextType.AssemblyQualifiedName; 
 
            // Keep track of all the filters we create
            _filters.Add(filter); 
        }

        /// 
        /// See base class documentation 
        /// 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] 
        protected override void OnInit(EventArgs e) { 
            base.OnInit(e);
 
            // Don't do anything in Design mode
            if (DesignMode) {
                return;
            } 

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

        ///  
        /// See base class documentation
        /// 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")]
        protected override void OnItemCreated(RepeaterItemEventArgs e) { 
            base.OnItemCreated(e);
 
            if (DesignMode) { 
                return;
            } 

            ListItemType listItemType = e.Item.ItemType;
            if (listItemType == ListItemType.Item || listItemType == ListItemType.AlternatingItem) {
                OnFilterItemCreated(e.Item); 
            }
        } 
 
        private void Page_InitComplete(object sender, EventArgs e) {
            // We need to do this in InitComplete rather than Init to allow the user to set the 
            // TableName in Page_Init
            DataSource = GetFilteredColumns();
            DataBind();
        } 

        #region IWhereParametersProvider Members 
 
        /// 
        /// See IWhereParametersProvider 
        /// 
        public virtual IEnumerable GetWhereParameters(IDynamicDataSource dataSource) {
            // Add all the specific filters as where parameters
            return GetFilterControls().Select(filter => (Parameter)new DynamicControlParameter(filter.UniqueID) { 
                Name = filter.DataField,
            }); 
        } 

        #endregion 
    }
}

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

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