C# Message Box, variable usage

Question

I have searched but I dont know if I am using the correct verbiage to search for. I am writing a program in C# for my class but I am having trouble with the message box.

I am trying to have the message box show a message and read a variable at the same time. I have no problem doing this in the console applications but I cannot figure it out for the Windows side.

So far I have:

MessageBox.Show("You are right, it only took you {0} guesses!!!", "Results", MessageBoxButtons.OK);

Which works fine. Howerver I am trying to have the {0} be the result of the variable numGuesses. I'm sure this is simple and I am just overlooking it in the book or something, or I have the syntax incorrect someplace.

Albers

MessageBox.Show(String.Format("You are right, it only took you {0} guesses!!!", numGuesses), "Results", MessageBoxButtons.OK); – Tinfoil

Answer 1

try

MessageBox.Show(string.Format ("You are right, it only took you {0} guesses!!!", numGuesses ), "Results", MessageBoxButtons.OK);

see http://msdn.microsoft.com/en-us/library/system.string.format(v=VS.100).aspx

Lynxeyed

Answer 2

You can use String.Format or simple string concatenation.

MessageBox.Show(String.Format("You are right, it only took you {0} guesses!!!", myVariable), "Results", MessageBoxButtons.OK);

http://msdn.microsoft.com/en-us/library/system.string.format(v=VS.100).aspx

Concatenation:

MessageBox.Show("You are right, it only took you " + myVariable + " guesses!!!", "Results", MessageBoxButtons.OK);

Both results are equivalent, but you may prefer String.Format if you have multiple variables in the same string.

Baseler

Answer 3

What about String.Format() ?

MessageBox.Show(String.Format("You are right, it only took you {0} guesses!!!", numGuesses), "Results", MessageBoxButtons.OK);

Mizzenmast

Answer 4

String.Format is what you want:

string message = string.Format("You are right, it only took you {0} guesses!!!",numGuesses)

MessageBox.Show(message, "Results", MessageBoxButtons.OK);

Perfusion

Answer 5

MessageBox.Show(
                  string.Format(
                                 "You are right, it only took you {0} guesses!!!",
                                Results
                               ), 
                  MessageBoxButtons.OK
               );

Neolith

Answer 6

You are well done with your class, and this thread is old. With that said, today you can solve this issue as such:

var firstName = "Sam";
MessageBox.Show($"My first name is { firstName }.", "First Name", MessageBoxButtons.Ok);

You can also use it in a catch block:

...
}
catch (Exception ex)
{
    MessageBox.Show($"Program encountered an error \n\n{ ex.Message }", "Program Error", MessageBoxButtons.Ok);
}

Basically any string variable can be used in this way. Not sure about functions that return a string, though I don't see why not.

Anthology

Answer 7

I tend to do this - it allows flexible arguments and it's quite compact:

private void MsgBox(string msg, params object[] args)
{
    MessageBox.Show(String.Format(msg, args));
}

string routine = "TimerHandler";
int errorcode = 1234;

MsgBox("Error {0} in function {1}.", errorcode, routine);

Latanya