WPF CheckBox双向绑定不起作用 [英] WPF CheckBox TwoWay Binding not working

问题描述

我有

 <DataGridCheckBoxColumn 
     Binding="{Binding Path=Foo, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
 />

和

 public bool Foo{ get; set; }

Checking/Unchecking 设置 Foo，但在代码中设置 Foo 不会改变 Checkbox 状态.有什么建议吗?

Checking/Unchecking sets Foo, but setting Foo in code does not change the Checkbox state. Any Suggesitons?

推荐答案

当您在 DataContext 中设置 Foo 时，您需要引发 PropertyChanged 事件.通常，它看起来像:

You need to raise the PropertyChanged event when you set Foo in your DataContext. Normally, it would look something like:

public class ViewModel : INotifyPropertyChanged
{
    private bool _foo;

    public bool Foo
    {
        get { return _foo; }
        set
        {
            _foo = value;
            OnPropertyChanged("Foo");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string propertyName)
    {
        var propertyChanged = PropertyChanged;
        if (propertyChanged != null)
        {
            propertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

如果您调用 Foo = someNewvalue，将引发 PropertyChanged 事件并且您的 UI 应该更新

If you call Foo = someNewvalue, the PropertyChanged event will be raised and your UI should be updated

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