无法将类型'System.EventHandler'隐式转换为'System.EventHandler< object>'用于情节提要完整 [英] Cannot implicitly convert type 'System.EventHandler' to 'System.EventHandler<object>' for storyboard complete

问题描述

我已经阅读了一些有关此的主题，但是我仍然不知道如何解决此问题.我来自Java，大部分是C#的新手

我想在动画结束时附加侦听器:

myStoryBoard.Completed += new EventHandler(onMyStoryBoardCompleted);

并且:

private void onMyStoryBoardCompleted(object sender, EventArgs e)
{       
}

我得到标题中的错误.我试过了:

 myStoryBoard.Completed += new EventHandler<object>(onMyStoryBoardCompleted);

但是我得到:

no overload for 'onMyStoryBoardCompleted' matches delegate 'System.EventHandler<object>'

因此，签名似乎与EventHandler <object>不兼容，我找不到如何使其兼容的方式，我也不知道这种方法是否正确.

我读

了解C#中的事件和事件处理程序

C#动态模板隐式转换从System.EventHandler到System.EventHandler< TEventArgs>

的错误

定义Tick的事件处理程序Windows 8应用程序中DispatcherTimer的事件

但是仍然找不到这种情况的解决方案.

谢谢.

解决方案

尝试:

private void onMyStoryBoardCompleted(object sender, object e)
{ }

并使用通用EventHandler<object>订阅:

myStoryBoard.Completed += new EventHandler<object>(onMyStoryBoardCompleted);

当然，这违反了.NET Framework约定，事件处理程序的第二个参数应为EventArgs的实例(或其派生类).我假设您正在另一个框架上运行，例如Windows 8 Metro，该框架的Timeline类定义了Understanding events and event handlers in C#

C# Dynamic template implicit conversion error from System.EventHandler to System.EventHandler<TEventArgs>

defining event handler for Tick event of DispatcherTimer in windows 8 app

But still don't find the solution for this case.

Thanks in advance.

解决方案

Try:

private void onMyStoryBoardCompleted(object sender, object e)
{ }

And subscribe using the generic EventHandler<object>:

myStoryBoard.Completed += new EventHandler<object>(onMyStoryBoardCompleted);

Of course, this goes against the .NET Framework convention that the second argument to an event handler should be an instance of EventArgs (or a class derived thereof). I am assuming that you are running on another framework, such as Windows 8 Metro, whose Timeline class defines a Completed event with an EventHandler<object> signature.

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