不同于VB中可以直接使用MsgBox来得到消息框的返回值，在C#中需要使用 DialogResult 类型的变量，从MessageBox.show（）方法接受消息对话框的返回值。至于MessageBox.show（）的返回值是 Yes 、No， Ok还是Cancel，那需要自己在Show()方法中对它可以显示的选择按钮进行设置。以下示例代码可以参考：
// Initializes the variables to pass to the MessageBox.Show method.
string message = "You did not enter a server name. Cancel this operation?";
string caption = "No Server Name Specified";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result;
// Displays the MessageBox.
result = MessageBox.Show(this, message, caption, buttons,
MessageBoxIcon.Question, MessageBoxDefaultButton.Button1,
MessageBoxOptions.RightAlign);
if(result == DialogResult.Yes)
{
//Do your action here.
}
// Initializes the variables to pass to the MessageBox.Show method.
string message = "You did not enter a server name. Cancel this operation?";
string caption = "No Server Name Specified";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result;
// Displays the MessageBox.
result = MessageBox.Show(this, message, caption, buttons,
MessageBoxIcon.Question, MessageBoxDefaultButton.Button1,
MessageBoxOptions.RightAlign);
if(result == DialogResult.Yes)
{
//Do your action here.
}
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