MVVMLight-将参数传递给ViewModel构造函数? [英] MVVMLight-- Passing a parameter to a ViewModel constructor?

问题描述

假设我有一个ListBox，该ListBox绑定到Foo对象的集合，并且所选的Foo显示在contentcontrol中，内容模板为FooView.

Suppose I have a ListBox which is bound to a collection of Foo objects, and the selected Foo is displayed in a contentcontrol with the content template being a FooView.

有没有一种方法可以使FooView将选定的Foo传递给FooViewModel的构造函数，该构造函数是通过ViewModelLocator的数据上下文?

Is there a way that I can make it so that the FooView passes the selected Foo to the constructor of the FooViewModel which is it's datacontext via the ViewModelLocator?

推荐答案

MainViewModel

MainViewModel

/*INotifyPropertChanged property*/
public FooViewModel CurrentFooVM{
    get{/*INPC code*/}
    private set{/*INPC code*/}
}

/*INotifyPropertChanged property*/
public Foo SelectedFoo{
    get{/*INPC code*/}
    set{/*INPC code*/ CurrentFooVM = new FooViewModel(_selectedFoo)}
}

public ObservableCollection<Foo> Foos {get; private set;}

MainView

<ListBox ItemsSource={Binding Foos}
         SelectedItem={Binding SelectedFoo}>...
<FooView... bind to CurrentFooVM...

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