MultiSelectionSearchComboBox

1）Xaml

DrawingExampleVM DataSource

        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Button Content="获取选中" 
                    VerticalAlignment="Bottom"
                    HorizontalAlignment="Center"
                    Click="Button_Click"
                    Margin="0,20,0,0"
                    Style="{StaticResource SuccessPrimaryButton}"/>
            <UniformGrid Columns="2" Rows="2" Grid.Row="1">
                <wd:MultiSelectionSearchComboBox
                VerticalContentAlignment="Center" 
                HorizontalAlignment="Center"
                    ItemsSource="{Binding Drawings}" 
                DisplayMemberPath="Number"
                SelectedValuePath="Index"
                Width="200" Delimiter=","
                IsSelectAllActive="True">
                    <wd:MultiSelectionSearchComboBox.DataContext>
                        <vm:DrawingExampleVM/>
                    </wd:MultiSelectionSearchComboBox.DataContext>
                </wd:MultiSelectionSearchComboBox>
                <wd:MultiSelectionSearchComboBox
                    Name="MyMultiSelectionSearchComboBox2"
                VerticalContentAlignment="Center" 
                HorizontalAlignment="Center"
                ItemsSource="{Binding Drawings}" 
                DisplayMemberPath="Number"
                SelectedValuePath="Index"
                Width="200" Delimiter="^"
                IsSelectAllActive="True"
                wd:ElementHelper.Watermark="MultiSelectionSearchComboBox"
                SearchWatermark="请输入搜索内容">
                    <wd:MultiSelectionSearchComboBox.DataContext>
                        <vm:DrawingExampleVM/>
                    </wd:MultiSelectionSearchComboBox.DataContext>
                </wd:MultiSelectionSearchComboBox>
            </UniformGrid>
        </Grid>

2）CSharp

        private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            WPFDevelopers.Controls.MessageBox.Show($"{MyMultiSelectionSearchComboBox2.Text} \r\n总共选中:{MyMultiSelectionSearchComboBox2.SelectedItems.Count} 条","选中内容",MessageBoxButton.OK,MessageBoxImage.Information);      
        }