如何在自定义控件中创建可绑定的命令? [英] How to create bindable commands in Custom control?

问题描述

假设下面的代码，

public class SomeViewModel{
      ICommand ReloadCommand{get...}
      ICommand SaveCommand{get..}
}

//SomeView.xaml
<SomeCustomControl Reload="ReloadCommand" Save="SaveCommand" /> //NOT SURE HOW??

//SomeCustomContro.xaml
<SomeCustomControl x:Name="someCustomControl">
<Button Command={Binding ElementName=someCustomControl, Path=Reload />
<Button Command={Binding ElementName=someCustomControl, Path=Save />
</SomeCustomControl>

//SomeCustomControl.xaml.cs
.....  //NOT SURE HOW TO ALLOW BINDING TO A ICOMMAND ??

在我的SomeCustomControl中，我需要支持在xaml中绑定ICommand". 我知道DependencyProperties可以这样绑定，但是在这种情况下，我需要绑定ICommand.

In my SomeCustomControl, I need to support "binding of ICommand in xaml". I understand DependencyProperties could be bind like this, but in this case I need to bind ICommand.

有人可以建议这样做的最好方法是什么? 任何建议的材料或链接都将有用，因为我错过了方向.

Can somebody please suggest what is the best way to do this? Any suggested material or link would be of use because I am missing a direction.

编辑1)我可以在SomeCustomControl中使用DataContext SomeView.两者之间还有更多我无法解决的逻辑和分离.我必须在SomeCustomControl中的某个位置维护对Reload/Save ICommands的引用.

EDIT 1) I can use the DataContext SomeView in SomeCustomControl. There is more logic and separation between the two which I can not dissolve. I 'must' maintain a reference of Reload/Save ICommands somewhere in my SomeCustomControl.

非常感谢.

推荐答案

让我直截了当，您想绑定到Reload和Save对吗?

Let me get you straight, you want to bind to the Reload and Save right?

因此需要为SomeCustomControl创建，声明和定义两个类型为ICommand的依赖项属性ReloadCommandProperty和SaveCommandProperty.

So that needs creating, declaring and defining two dependency properties ReloadCommandProperty and SaveCommandProperty of type ICommand for SomeCustomControl.

因此，假设SomeCustomControl来自Control ...

So assuming that SomeCustomControl derives from Control ...

public class SomeCustomControl : Control
{
    public static DependencyProperty ReloadCommandProperty
        = DependencyProperty.Register(
            "ReloadCommand",
            typeof (ICommand),
            typeof (SomeCustomControl));

    public static DependencyProperty SaveCommandProperty
        = DependencyProperty.Register(
            "SaveCommand",
            typeof(ICommand),
            typeof(SomeCustomControl));

    public ICommand ReloadCommand
    {
        get
        {
            return (ICommand)GetValue(ReloadCommandProperty);
        }

        set
        {
            SetValue(ReloadCommandProperty, value);
        }
    }

    public ICommand SaveCommand
    {
        get
        {
            return (ICommand)GetValue(SaveCommandProperty);
        }

        set
        {
            SetValue(SaveCommandProperty, value);
        }
    }
}

正确绑定到RelodCommand和SaveCommand属性后，将开始工作...

After this proper binding to RelodCommand and SaveCommand properties will start working...

     <SomeCustomControl RelodCommand="{Binding ViewModelReloadCommand}"
                        SaveCommand="{Binding ViewModelSaveCommand}" /> 

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