如何关闭消息对话框编程 [英] How to close Message Dialog programmatically

问题描述

我想在我的WinRT应用程序关闭一个MessageDialog。我注意到，如果我试图表明一次两个消息的对话框中，我得到一个UnauthorizedAccessException。为了避免这种情况，我想关闭现有消息对话框，如果它是开放的。我使用它来显示对话框：

I am trying to close a MessageDialog in my WinRT App. I have noticed if I attempt to show two message dialogs at once, I get an UnauthorizedAccessException. To avoid this, I want to close the existing message dialog if it is open. I use this to show the dialog:

    MessageDialog md = new MessageDialog(" ");

    private void MessageBox(string s)
    {
        Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
        {
            md.Content = s;
            //CLOSE HERE
            md.ShowAsync();
        }
        );
    }

我怎么关闭它？

How do I close it?

推荐答案

而不是试图找到一种方法来关闭它，试试这个
声明一个实例变量AsyncCommand;

instead of trying to find a way to close it, try this declare a instance variable for AsyncCommand;

AsyncCommand command;

command = md.ShowAsync();

然后在您的commandhandler，运行你的方法检查，如果命令为null

then in your commandhandler, before running your method check if command is null

if(command!=null)
{
command.Cancel();
}

//
做的东西/ TRYAGAIN块

// do stuff/ tryagain block

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