DropDownItems プロパティ (RecordFilterDropDownPopulatingEventArgs)

フィルター ドロップダウンに表示される項目を返します。新しいエントリの追加またはフィルター ドロップダウンから存在のエントリの削除をするのにリストの変更が可能です。

シンタックス

Visual Basic

'宣言
 
Public ReadOnly Property DropDownItems As List(Of FilterDropDownItem)

C#

public List<FilterDropDownItem> DropDownItems {get;}

解説

ItemsType が MenuItems を返す場合、このプロパティは null を返します。

使用例

Visual Basic

Imports Infragistics.Windows
Imports Infragistics.Windows.Controls
Imports Infragistics.Windows.Editors
Imports Infragistics.Windows.DataPresenter
Imports Infragistics.Windows.DataPresenter.Events

    Private Sub Dp_RecordFilterDropDownPopulating(ByVal sender As Object, ByVal e As RecordFilterDropDownPopulatingEventArgs)
        If e.Field.EditAsTypeResolved Is GetType(String) Then
            ' At this point, e.DropDownItems will be pre-populated with special operands, like
            ' (Custom), (Blanks), (NonBlanks) etc... You can remove them if you don't want to
            ' display those options.
            ' 
            ' Remove all but (All) and (Custom) items from the drop-down.
            ' 
            Dim i As Integer
            For i = e.DropDownItems.Count - 1 To 0 Step -1
                ' Remove all but (All) and (Custom) items from the list.
                ' 
                If Not e.DropDownItems(i).DisplayText.StartsWith("(All)") _
                  AndAlso Not e.DropDownItems(i).DisplayText.StartsWith("(Custom)") Then
                    e.DropDownItems.RemoveAt(i)
                End If
            Next


            ' After this event is raised, data presenter will populate the drop-down with
            ' field values. If you don't want to display field values in the filter drop-down
            ' then set IncludeUniqueValues to false, which will prevent the data presenter
            ' from adding field values to the drop-down.
            ' 
            e.IncludeUniqueValues = False

            ' Add custom items. Items can be ICondition derived class (here we are using built-in
            ' ComparisonCondition), or a SpecialFilterBase derived class, or a ICommand (which
            ' lets you to take an action, like show a dialog). You can even implement your own 
            ' ICondition to provide completely custom logic.
            ' 
            Dim item As FilterDropDownItem
            item = New FilterDropDownItem(New ComparisonCondition(ComparisonOperator.Match, "^[A-F]"), "A-F")
            e.DropDownItems.Add(item)

            item = New FilterDropDownItem(New ComparisonCondition(ComparisonOperator.Match, "^[G-K]"), "G-K")
            e.DropDownItems.Add(item)

            item = New FilterDropDownItem(New ComparisonCondition(ComparisonOperator.Match, "^[L-P]"), "L-P")
            e.DropDownItems.Add(item)

            item = New FilterDropDownItem(New ComparisonCondition(ComparisonOperator.Match, "^[Q-Z]"), "Q-Z")
            e.DropDownItems.Add(item)
        End If
    End Sub

C#

using Infragistics.Windows;
using Infragistics.Windows.Controls;
using Infragistics.Windows.Editors;
using Infragistics.Windows.DataPresenter;
using Infragistics.Windows.DataPresenter.Events;

		private void dp_RecordFilterDropDownPopulating( object sender, RecordFilterDropDownPopulatingEventArgs e )
		{
			if ( e.Field.EditAsTypeResolved == typeof( string ) )
			{
				// At this point, e.DropDownItems will be pre-populated with special operands, like
				// (Custom), (Blanks), (NonBlanks) etc... You can remove them if you don't want to
				// display those options.
				// 
				// Remove all but (All) and (Custom) items from the drop-down.
				// 
				for ( int i = e.DropDownItems.Count - 1; i >= 0; i-- )
				{
					// Remove all but (All) and (Custom) items from the list.
					// 
					if ( ! e.DropDownItems[i].DisplayText.StartsWith( "(All)" )
						&& ! e.DropDownItems[i].DisplayText.StartsWith( "(Custom)" ) )
					{
						e.DropDownItems.RemoveAt( i );
					}
				}

				// After this event is raised, data presenter will populate the drop-down with
				// field values. If you don't want to display field values in the filter drop-down
				// then set IncludeUniqueValues to false, which will prevent the data presenter
				// from adding field values to the drop-down.
				// 
				e.IncludeUniqueValues = false;

				// Add custom items. Items can be ICondition derived class (here we are using built-in
				// ComparisonCondition), or a SpecialFilterBase derived class, or a ICommand (which
				// lets you to take an action, like show a dialog). You can even implement your own 
				// ICondition to provide completely custom logic.
				// 
				FilterDropDownItem item;
				item = new FilterDropDownItem( new ComparisonCondition( ComparisonOperator.Match, "^[A-F]" ), "A-F" );
				e.DropDownItems.Add( item );

				item = new FilterDropDownItem( new ComparisonCondition( ComparisonOperator.Match, "^[G-K]" ), "G-K" );
				e.DropDownItems.Add( item );

				item = new FilterDropDownItem( new ComparisonCondition( ComparisonOperator.Match, "^[L-P]" ), "L-P" );
				e.DropDownItems.Add( item );

				item = new FilterDropDownItem( new ComparisonCondition( ComparisonOperator.Match, "^[Q-Z]" ), "Q-Z" );
				e.DropDownItems.Add( item );
			}
		}