c# - WindowsBase.dll 中发生类型为 'System.InvalidCastException' 的第一次机会异常

Question

将 ListBox 的 ItemsSource 绑定(bind)到 ObservableCollection<object> 时出现此异常.

该集合混合了 {DependencyPropertyChangedEventArgs, EventEntry}

我偷看了DependencyPropertyChangedEventArgs并发现:

public struct DependencyPropertyChangedEventArgs
{
    ...
    public override bool Equals(object obj)
    {
        return this.Equals((DependencyPropertyChangedEventArgs)obj); <- huge cast right here?
    }
}

EventEntry 代码:

public class EventEntry
{
    public EventEntry(string name)
    {
        Name = name;
    }
    public string Name { get; private set; }
}

当我阅读偷看的代码时，它会爆炸。

这样对吗？

Answer 1

确认错误，重现:

[Test]
public void Repro()
{
    var args = new DependencyPropertyChangedEventArgs(UIElement.IsEnabledProperty, false, true);
    Assert.Throws<InvalidCastException>(() => args.Equals(1));
}

Confirmed bug in the implementation: (below code is from reference source)

public override bool Equals(object obj)
{
    return Equals((DependencyPropertyChangedEventArgs)obj);
}

Filed a bug on Connect