MessageBox variable

Question

I need to create a variable and assign it a message box.

Example:

MessageBox nomatch =  MessageBox.Show("No such thing", "Warning");

Is this possible in c# windows forms?

Answer 1

When i make a search and the input doesn't found a match, this message box appears... And i need to use it for multiple exceptions

MessageBox doesn't have any public constructor so you can't create it and assign to a variable. But if you want to execute same code in different place, you can declare a Func delegate like this:

Func<DialogResult> showMsgBox = () => MessageBox.Show("No such thing", "Warning");

And call it wherever you want to show message box:

showMsgBox();

If you don't care about return value you can use Action instead.

Answer 2

After reading the comments, I think this is what you may want.

private static void ShowMessageBox(){
    MessageBox.Show("No such thing", "Warning");
}

when you need the messagebox, just use

ShowMessageBox()

you can also extend the method to

private static void ShowMessageBox(string msg){
    MessageBox.Show(msg, "Warning");
}

show you can input the message you want with ShowMessageBox("Hello World!")

Answer 3

You cannot create a new instance of the MessageBox class.

Look into the remarks section of below MSDN documentation.

https://msdn.microsoft.com/en-us/library/system.windows.forms.messagebox(v=vs.110).aspx

More over show returns DialogResult, which is enum type.