c# - 为什么RelayCommand <T> .Execute接受一个对象而不是T？

这什么都没做，只是导致了对否则不必要的强制转换的需求(或者更确切地说，导致我拉下代码库并自己进行更改)。有这样做的理由吗？

引用:

Source on Codeplex

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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

最佳答案

您的错误是由于lambda无法作为object传递的。而是尝试:

AsyncCallback callback = (iasyncresult) => Console.WriteLine(iasyncresult.IsCompleted);
DoCommand.Execute(callback);

关于c# - 为什么RelayCommand <T> .Execute接受一个对象而不是T？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6296396/