试试这个:

if (MessageBox.Show("Are you sure", "Title_here", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
{
    Do something here for 'Yes'...
}

MessageBox.Show(title, text, messageboxbuttons.yes/no)

这将返回一个您可以检查的dialgresult。

例如,

if(MessageBox.Show("","",MessageBoxButtons.YesNo) == DialogResult.Yes)
{
   //do something
}

MessageBox确实会产生一个dialgresults

DialogResult r = MessageBox.Show("Some question here");

您还可以很容易地指定按钮。更多文档可以在http://msdn.microsoft.com/en-us/library/ba2a6d06.aspx上找到

dynamic MsgResult = this.ShowMessageBox("Do you want to cancel all pending changes ?", "Cancel Changes", MessageBoxOption.YesNo);

if (MsgResult == System.Windows.MessageBoxResult.Yes)
{
    enter code here
}
else 
{
    enter code here
}

从这里查看更多细节

if (MessageBox.Show("Please confirm before proceed" + "\n" + "Do you want to Continue ?", "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)

{
//do something if YES
}

else

{
//do something if NO
}

DialogResult dr = MessageBox.Show("Are you happy now?", 
                      "Mood Test", MessageBoxButtons.YesNo);
switch(dr)
{
   case DialogResult.Yes:
      break;
   case DialogResult.No:
      break;
}

MessageBox类就是您要找的。