VisualBasic InputBox Cancel

问题:

Quick question:

I'm using a Microsoft.VisualBasic.Interaction.InputBox in my C# code to allow users to add websites to a list, but I don't want them to enter an empty string so I give an error popup in case that happens. However, the error will also pop up if the user presses "cancel", which I don't want to happen.

Reading the documentation on it says that pressing "cancel" returns an empty string, hence why it fires the error. Is there a way to still define wether the user pressed "okay" with an empty string or "cancel"?

Thanks in advance,

-Peter

回答1:

You can't do this. From MSDN

If the user clicks Cancel, a zero-length string is returned.

    Dim result As String = Microsoft.VisualBasic.InputBox("Enter some text")
    If result.Length > 0 Then
        Debug.WriteLine("Something entered and OK Clicked")
    Else
        Debug.WriteLine("Cancel Button Clicked OR Blank String Entered and OK Clicked")
    End If

The easiest solution is just to create your own simple input form and test the DialogResult value

回答2:

string a;
            a = Interaction.InputBox("message", "title");
            if (a.Length > 0)
            {
                comboBox2.Items.Add(a);
                // ok
            }
            else
            {
                // cancel
            }