Trying to create custom filter for RadGridView

I'm trying to create a custom filter for a RadGridView, but no matter what I do I get the following error.

The value "(CategoryList Contains Allergies)" is not of type "Telerik.Windows.Data.IFilterDescriptor" and cannot be used in this generic collection.

Parameter name: value

The column that the filter is on contains a List<string> of possibly multiple category names in each row and the filter contains a distinct list of the categories.

001.publicpartialclassCategoryFilter : UserControl, IFilteringControl

002.{

003. privateGridViewBoundColumnBase _column;

004.

005. publicdelegatevoidBeginCategoryChangeEvent();

006. publiceventBeginCategoryChangeEvent BeginCategoryChange;

007.

008. publicdelegatevoidCategoryChangeEvent();

009. publiceventCategoryChangeEvent CategoryChange;

010. privateCompositeFilterDescriptor _compositeFilter;

011.

012.

013. publicclassCategoryItem

014. {

015. publicstringCategoryName { get; set; }

016. publicboolIsChecked { get; set; }

017. }

018.

019. privateList<CategoryItem> MainCategoryList;

020.

021. /// <summary>

022. /// Gets or sets a value indicating whether the filtering is active.

023. /// </summary>

024. publicboolIsActive

025. {

026. get{ return(bool)GetValue(IsActiveProperty); }

027. set{ SetValue(IsActiveProperty, value); }

028. }

029.

030. /// <summary>

031. /// Identifies the <see cref="IsActive"/> dependency property.

032. /// </summary>

033. publicstaticreadonlyDependencyProperty IsActiveProperty =

034. DependencyProperty.Register(

035. "IsActive",

036. typeof(bool),

037. typeof(CategoryFilter),

038. newSystem.Windows.PropertyMetadata(false));

039.

040.

041.

042.

043. publicboolthis[stringCategoryName]

044. {

045. get

046. {

047. CategoryItem item = MainCategoryList.FirstOrDefault(i => i.CategoryName == CategoryName);

048.

049. if(item == null)

050. thrownewException("Category Name not found");

051.

052. return(item.IsChecked);

053. }

054. set

055. {

056. CategoryItem item = MainCategoryList.FirstOrDefault(i => i.CategoryName == CategoryName);

057.

058. if(item == null)

059. thrownewException("Category Name not found");

060.

061. item.IsChecked = value;

062. }

063. }

064.

065. [TypeConverter(typeof(String))]

066. publicList<string> Categories

067. {

068. get

069. {

070. returnMainCategoryList.Where(i => i.IsChecked).Select(i => i.CategoryName).ToList();

071. }

072. set

073. {

074. foreach(CategoryItem item inMainCategoryList)

075. {

076. item.IsChecked = value.Contains(item.CategoryName);

077. }

078. }

079. }

080.

081. publicSystem.Windows.Controls.ListBox CategoryList

082. {

083. get{ returnthis.LstCategories; }

084. }

085.

086. publicCategoryFilter()

087. {

088. InitializeComponent();

089. }

090.

091. publicvoidPrepare(GridViewColumn column)

092. {

093. this._column = column asGridViewBoundColumnBase;

094. if(this._column == null)

095. {

096. return;

097. }

098.

099. List<string> catList = ((List<EducationChoices>)(column.DataControl.ItemsSource))

100. .SelectMany(l => l.CategoryList)

101. .Distinct()

102. .Where(l => (l ?? "")

103. .Trim() != "")

104. .OrderBy(c => c)

105. .ToList();

106.

107. MainCategoryList = catList

108. .Select(i => newCategoryItem() {CategoryName = i, IsChecked = false})

109. .ToList();

110.

111. LstCategories.ItemsSource = MainCategoryList;

112. }

113.

114. privatevoidChangeFilter(objectsender, RoutedEventArgs e) {

115. BeginCategoryChange();

116.

117. if(_compositeFilter != null) {

118. _column.DataControl.FilterDescriptors.Remove(_compositeFilter);

119. }

120. _compositeFilter = newCompositeFilterDescriptor { LogicalOperator = FilterCompositionLogicalOperator.Or };

121. var dataMember = _column.DataMemberBinding.Path.Path;

122.

123. stringCategory = ((CheckBox)e.OriginalSource).Tag.ToString();

124.

125. foreach(var item inMainCategoryList) {

126. if(item.IsChecked) {

127. var filter = newFilterDescriptor(dataMember, FilterOperator.Contains, Category);

128. _compositeFilter.FilterDescriptors.Add(filter);

129. }

130. }

131.

132. if((((CheckBox)e.OriginalSource).IsChecked ?? false) &&

133. _compositeFilter.FilterDescriptors.All(f => ((FilterDescriptor)f).Value.ToString() != Category))

134. {

135. var filter = newFilterDescriptor(dataMember, FilterOperator.Contains, Category);

136. _compositeFilter.FilterDescriptors.Add(filter);

137. } elseif(!(((CheckBox) e.OriginalSource).IsChecked ?? false) &&

138. _compositeFilter.FilterDescriptors.Any(f => ((FilterDescriptor) f).Value.ToString() == Category))

139. {

140. _compositeFilter.FilterDescriptors.Remove(

141. _compositeFilter.FilterDescriptors.FirstOrDefault(

142. f => ((FilterDescriptor) f).Value.ToString() == Category));

143. }

144.

145.

146. if(!_column.DataControl.FilterDescriptors.Contains(_compositeFilter)) {

147. _column.DataControl.FilterDescriptors.Add(_compositeFilter);

148. }

149.

150. this.IsActive = true;

151.

152. CategoryChange();

153. }

154.}

I found this thread and tried to figure out what it was doing, but it didn't help.

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