将DataGrid行中的DoubleClick命令绑定到虚拟机
将DataGrid行中的DoubleClick命令绑定到虚拟机
提问于 2013-07-02 15:12:42
我有一个Datagrid，我不喜欢我的变通方法在我的视图模型上为被点击的(也就是选中的)行触发双击命令。
查看：
<DataGrid EnableRowVirtualization="True"
ItemsSource="{Binding SearchItems}"
SelectedItem="{Binding SelectedItem}"
SelectionMode="Single"
SelectionUnit="FullRow">
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseDoubleClick">
<cmd:EventToCommand Command="{Binding MouseDoubleClickCommand}" PassEventArgsToCommand="True" />
</i:EventTrigger>
</i:Interaction.Triggers>
...
</DataGrid>ViewModel：
public ICommand MouseDoubleClickCommand
{
get
{
if (mouseDoubleClickCommand == null)
{
mouseDoubleClickCommand = new RelayCommand<MouseButtonEventArgs>(
args =>
{
var sender = args.OriginalSource as DependencyObject;
if (sender == null)
{
return;
}
var ancestor = VisualTreeHelpers.FindAncestor<DataGridRow>(sender);
if (ancestor != null)
{
MessengerInstance.Send(new FindDetailsMessage(this, SelectedItem.Name, false));
}
}
);
}
return mouseDoubleClickCommand;
}
}我想去掉视图模型中与视图相关的代码(带有依赖对象和可视化树帮助器的代码)，因为这以某种方式破坏了可测试性。但从另一方面来说，我避免了当用户不是单击一行而是单击标题时发生的事情。
PS:我试着看一下附加的行为，但我不能在工作时从Skydrive下载，所以一个‘内置’的解决方案将是最好的。
回答 3
Stack Overflow用户
回答已采纳
发布于 2013-07-02 17:29:21
为什么不简单地使用CommandParameter
<DataGrid x:Name="myGrd"
ItemsSource="{Binding SearchItems}"
SelectedItem="{Binding SelectedItem}"
SelectionMode="Single"
SelectionUnit="FullRow">
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseDoubleClick">
<cmd:EventToCommand Command="{Binding MouseDoubleClickCommand}"
CommandParameter="{Binding ElementName=myGrd, Path=SelectedItem}" />
</i:EventTrigger>
</i:Interaction.Triggers>
...
</DataGrid>您的命令如下所示：
public ICommand MouseDoubleClickCommand
{
get
{
if (mouseDoubleClickCommand == null)
{
mouseDoubleClickCommand = new RelayCommand<SearchItem>(
item =>
{
var selectedItem = item;
});
}
return mouseDoubleClickCommand;
}
}编辑:我现在使用它而不是Interaction.Triggers
<DataGrid.InputBindings>
<MouseBinding MouseAction="LeftDoubleClick"
Command="{Binding Path=MouseDoubleClickCommand}"
CommandParameter="{Binding ElementName=myGrd, Path=SelectedItem}" />
</DataGrid.InputBindings>Stack Overflow用户
发布于 2016-01-06 00:39:50
比这里提出的任何解决方案都要简单。
我用的是这个。
<!--
requires IsSynchronizedWithCurrentItem
for more info on virtualization/perf https://stackoverflow.com/questions/9949358/datagrid-row-virtualization-display-issue
-->
<DataGrid ItemsSource="{Binding SearchItems}"
IsSynchronizedWithCurrentItem="True"
AutoGenerateColumns="false" CanUserAddRows="False" CanUserDeleteRows="False" IsReadOnly="True" EnableRowVirtualization="True"
>
<!-- for details on ICollection view (the magic behind {Binding Accounts/} https://marlongrech.wordpress.com/2008/11/22/icollectionview-explained/ -->
<DataGrid.InputBindings>
<MouseBinding
MouseAction="LeftDoubleClick"
Command="{Binding MouseDoubleClickCommand}"
CommandParameter="{Binding SearchItems/}" />
</DataGrid.InputBindings>
</DataGrid>来自WPF DataGrid: CommandBinding to a double click instead of using Events
Stack Overflow用户
发布于 2013-07-02 15:24:35
您可以尝试此解决方法：
<DataGrid EnableRowVirtualization="True"
ItemsSource="{Binding SearchItems}"
SelectedItem="{Binding SelectedItem}"
SelectionMode="Single"
SelectionUnit="FullRow">
<DataGrid.Columns>
<DataGridTemplateColumn Header=".....">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock .....>
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseDoubleClick">
<cmd:EventToCommand Command="{Binding MouseDoubleClickCommand}" PassEventArgsToCommand="True" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBlock>
</DataTemplate>
...................在这种情况下，您必须为DataGrid中的每一列指定DataTemplate
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原文链接：
https://stackoverflow.com/questions/17419570
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