检查用户是否按yes \\ no \\ cancel的代码是什么？ （C＃）

Question

i'm using messageBoxButton.YesNoCancel button, and i wanna know which button the user press

how do i do it ?

this is the code:

 MessageBox.Show("this item is already in the system, do you want to add it anyway ?",
                 "Question",MessageBoxButtons.YesNoCancel);

thanks...

Answer 1

You can store the answers in a DialogResult object. Then you can analyze the answers like that:

       DialogResult result = MessageBox.Show("this item is already in the system, do you want to add it anyway ?", "Question",MessageBoxButtons.YesNoCancel);

       if (result == DialogResult.Yes) {
           //your code here
       } else if (result == DialogResult.Cancel) {
           //your code here
       } else if (result == DialogResult.No) {
          // your code here
       }

Answer 2

From http://msdn.microsoft.com/en-us/library/0x49kd7z.aspx :

        result = MessageBox.Show(message, caption, buttons);
        if (result == System.Windows.Forms.DialogResult.Yes)
        {
            // Closes the parent form.
            this.Close();
        }

Answer 3

DialogResult dialogResult = MessageBox.Show("your question?", 
                      "window title", MessageBoxButtons.YesNo);
switch(dialogResult){
   case DialogResult.Yes: break;
   case DialogResult.No: break;
}

All possible dialog results:

• DialogResult.Yes
• DialogResult.No
• DialogResult.Cancel
• DialogResult.Abort
• DialogResult.Ignore
• DialogResult.None
• DialogResult.Retry
• DialogResult.OK

And see the MessageBox MSDN entry.

Answer 4

The MessageBox.Show function returns a value of type DialogResult that indicates which button the user clicked. By examining that return value, you can figure out which one they chose.

DialogResult result = MessageBox.Show("this item is already in the system, do you want to add it anyway ?", "Question",MessageBoxButtons.YesNoCancel);

if (result == DialogResult.Yes)
{
    // they clicked Yes
}
else if (result == DialogResult.No)
{
    // they clicked No
}
else
{
    // they clicked Cancel
}

Alternatively, you could use a switch statement, rather than if .

Answer 5

MessageBox.Show() returns a DialogResult.

http://msdn.microsoft.com/en-us/library/0x49kd7z.aspx

http://msdn.microsoft.com/en-us/library/system.windows.forms.dialogresult.aspx

result = MessageBox.Show(...);

if(result == DialogResult.Yes)
{
}

Answer 6

if (MessageBox.Show(message, caption, buttons) == System.Windows.Forms.DialogResult.Yes) // or No or Cancel
        {

        }