为什么 RelayCommand.Execute 采用对象而不是 T？
这没有做任何事情，只是导致需要进行不必要的转换（或者更确切地说，导致我拉下代码库并自己进行更改）。这样做有理由吗？
参考资料：
编辑 这是一个例子：
DoCommand = new RelayCommand<AsyncCallback>((callBack) =>
{
Console.WriteLine("In the Action<AsyncCallback>");
SomeAsyncFunction((async_result) =>
{
Console.WriteLine("In the AsyncCallback");
callBack.Invoke(new MyAsyncResult(true));
});
});
DoCommand.Execute((iasyncresult) => Console.WriteLine(iasyncresult.IsCompleted));
//Where MyAsyncResult is a class implement IAsyncResult that sets IsCompleted in the constructor
// This will cause the "cannot cast lambda as object" error
This hasn't done anything but cause the need for what would otherwise be unnecessary casting (or rather, caused me to pull down the codebase and make the change myself). Is there a reason for doing this?
References:
Edit
Here's an example:
DoCommand = new RelayCommand<AsyncCallback>((callBack) =>
{
Console.WriteLine("In the Action<AsyncCallback>");
SomeAsyncFunction((async_result) =>
{
Console.WriteLine("In the AsyncCallback");
callBack.Invoke(new MyAsyncResult(true));
});
});
DoCommand.Execute((iasyncresult) => Console.WriteLine(iasyncresult.IsCompleted));
//Where MyAsyncResult is a class implement IAsyncResult that sets IsCompleted in the constructor
// This will cause the "cannot cast lambda as object" error
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评论（2）
因为 ICommand 不是通用的。 ICommand 的通用实现必须从接口进行强制转换、处理无效强制转换并将强制转换实例转发给通用方法。
Because ICommand is not generic. A generic implementation of ICommand must cast from the interface, handle invalid casts, and forward the cast instance to the generic methods.
您的错误是由于 lambda 无法作为
对象传递。相反尝试：Your error is due to the lambda not being able to be passed as an
object. Instead try: