[WPF][ListBox]鼠标拖拽多选,（Shift Key、Ctrl Key多选有效）（转）

<ListBox Name="listBox" SelectionMode="Extended">

    <ListBox.Resources>

        <Style TargetType="{x:Type ListBoxItem}">

            <EventSetter Event="ListBoxItem.PreviewMouseLeftButtonDown" Handler="lbItem_PreviewMouseLeftButtonDown"/>

            <EventSetter Event="ListBoxItem.PreviewMouseUp" Handler="lbItem_PreviewMouseUp"/>

            <EventSetter Event="ListBoxItem.PreviewMouseMove" Handler="lbItem_PreviewMouseMove"/>

        </Style>

    </ListBox.Resources>

    <x:Type TypeName="DependencyObject"/>

    <x:Type TypeName="Visual"/>

    <x:Type TypeName="UIElement"/>

    <x:Type TypeName="FrameworkElement"/>

    <x:Type TypeName="Control"/>

</ListBox>

private bool inMouseSelectionMode = false;

private List<ListBoxItem> selectedItems = new List<ListBoxItem>(); 

private void lbItem_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)

{

    // MouseDown时清空已选Item

    // 同时开始"inMouseSelectionMode"

    foreach (var item in selectedItems)

    {

        item.ClearValue(ListBoxItem.BackgroundProperty);

        item.ClearValue(TextElement.ForegroundProperty);

    }

    selectedItems.Clear();

    inMouseSelectionMode = true;

}

private void lbItem_PreviewMouseUp(object sender, MouseButtonEventArgs e)

{

    // MouseUp时停止"inMouseSelectionMode"

    ListBoxItem mouseUpItem = sender as ListBoxItem;

    inMouseSelectionMode = false;

} 

private void lbItem_PreviewMouseMove(object sender, MouseEventArgs e)

{

    ListBoxItem mouseOverItem = sender as ListBoxItem;

    if (mouseOverItem != null && inMouseSelectionMode && e.LeftButton == MouseButtonState.Pressed)

    {

        // Mouse所在的Item设置高亮

        mouseOverItem.Background = SystemColors.HighlightBrush;

        mouseOverItem.SetValue(TextElement.ForegroundProperty, SystemColors.HighlightTextBrush);

        if (!selectedItems.Contains(mouseOverItem)) { selectedItems.Add(mouseOverItem); }

    }

}

　　本文来自ny_dsc的博客，原文地址：http://hi.baidu.com/ny_dsc/blog/item/2bc69a31fdfb3186a8018e9a.html