MVVM 中的 Silverlight UserControl 与 RelayCommand- 例子？

发布于 2024-11-19 23:59:37 字数 556 浏览 2 评论 0原文

有人有一个很好的例子来创建用户控件，然后将命令绑定到它吗？

我的问题是将命令转发到 UserControl 中的控件，例如 TreeView 的 Drop 事件。目前尚不清楚，我该怎么做。

两个答案都很有趣，谢谢，他们有帮助，但是...

我想要这样的东西：

用法：

<my:MyControl Command="{Binding XCommand}" CommandParameter="{Binding [Here what?]}"/>

控件包含两个 DependencyProperties、Command 和 CommandParameters，我想将这两个 DependecyProperties 绑定到 TreeView - Drop 事件。我怎样才能做到这一点？因为 CommandParameter 的用法是相反的：不是控件传递参数，而是用户想要一些东西： CommandParameter="{Binding Text, ElementName=DisableCommandTextBox}"

原文

Has somebody a good example to create a UserControl, and then bind commands to it?

My problem is to forward the command to a control in the UserControl, for example to a TreeView's Drop event. It's not clear, how can I do that.

Both answer are interesting and thanks, they help, but...

I want something like that:

The usage:

<my:MyControl Command="{Binding XCommand}" CommandParameter="{Binding [Here what?]}"/>

The control contains the two DependencyProperties, Command and CommandParameters, and I'd like to bind these two DependecyProperties to a TreeView - Drop event. How can I do that? Because the usage of the CommandParameter is reversed: not the control passes a parameter, but the users wants something: CommandParameter="{Binding Text, ElementName=DisableCommandTextBox}"

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梦冥 2024-11-26 23:59:37

您正在尝试将事件转发到您的视图模型。我想您不需要 RelayCommand，但您需要 EventToCommand。我不知道如何绑定树视图事件，但你总是可以尝试一下。

使用 MVVM Light 的示例：
http://geekswithblogs.net/lbugnion/archive/2009/11/05/mvvm-light-toolkit-v3-alpha-2-eventtocommand-behavior.aspx

<Rectangle Fill="White"
           Stroke="Black"
           Width="200"
           Height="100">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseEnter">
            <cmd:EventToCommand Command="{Binding TestCommand,
                                          Mode=OneWay}"
               CommandParameter="{Binding Text,
                                  ElementName=MyTextBox,
                                  Mode=OneWay}"
               MustToggleIsEnabledValue="True" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Rectangle>

You are trying to forward an event to your viewmodel. I guess you don't need RelayCommand but you will need EventToCommand. I don't know about binding the treeview events, but you can always give it a try.

Example using MVVM Light:
http://geekswithblogs.net/lbugnion/archive/2009/11/05/mvvm-light-toolkit-v3-alpha-2-eventtocommand-behavior.aspx

<Rectangle Fill="White"
           Stroke="Black"
           Width="200"
           Height="100">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseEnter">
            <cmd:EventToCommand Command="{Binding TestCommand,
                                          Mode=OneWay}"
               CommandParameter="{Binding Text,
                                  ElementName=MyTextBox,
                                  Mode=OneWay}"
               MustToggleIsEnabledValue="True" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Rectangle>

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