Use:

MessageBoxResult m = MessageBox.Show("The file will be saved here.", "File Save", MessageBoxButton.OKCancel);
if(m == m.Yes)
{
    // Do something
}
else if (m == m.No)
{
    // Do something else
}

在Windows Phone上使用MessageBoxResult而不是dialgresult…

这应该做到:

DialogResult dialogResult = MessageBox.Show("Sure", "Some Title", MessageBoxButtons.YesNo);
if(dialogResult == DialogResult.Yes)
{
    //do something
}
else if (dialogResult == DialogResult.No)
{
    //do something else
}

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

@Mikael Svenson的答案是正确的。我只是想补充一点:

消息框图标还可以包含一个额外的属性，如下所示:

DialogResult dialogResult = MessageBox.Show("Sure", "Please Confirm Your Action", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

Use:

MessageBoxResult m = MessageBox.Show("The file will be saved here.", "File Save", MessageBoxButton.OKCancel);
if(m == m.Yes)
{
    // Do something
}
else if (m == m.No)
{
    // Do something else
}

在Windows Phone上使用MessageBoxResult而不是dialgresult…

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