在C#4.0中对DynamicObject进行子类化?

我一直在测试VS 2010和C#4.0中的一些新东西,并一直在努力了解它的局限性,到目前为止,我喜欢我所看到的,但有一件事让我有点恼火。。。

TryGetMember 直接)以避免铸造 dynamic ? 也许可以设置一些魔法属性 Test ?

class DynamicPropertyObject : DynamicObject
{
    private Dictionary<string, object> _properties = new Dictionary<string, object>();

    public override IEnumerable<string> GetDynamicMemberNames()
    {
        foreach (string s in _properties.Keys)
            yield return s;
    }

    public override bool TrySetMember(SetMemberBinder binder, object value)
    {
        _properties[binder.Name] = value;
        return true;
    }

    public override bool TryGetMember(GetMemberBinder binder, out object result)
    {
        result = null;
        if (!_properties.ContainsKey(binder.Name))
            return false;

        result = _properties[binder.Name];
        return true;
    }
}

class Test : DynamicPropertyObject
{
    public Test()
    {
        ((dynamic)this).Foo = "test";
    }
}