Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# C# Basics (Retired) Console I/O Namespaces

koren lahav
koren lahav
963 Points
Posted by koren lahav
koren lahav
963 Points

why when i write mono Program.cs it saying File does not contain a valid CIL image.

why when i write mono Program.cs it saying File does not contain a valid CIL image.

here the code: class Program { static void Main() { // Prompt user for minutes exercised System.Console.Write("Enter how many minutes you exercised: ");

  string entry = System.Console.ReadLine(); 

  System.Console.Write(entry);

    // Add minutes exercised to total 
    // Display total minutes exercised to the screen 
    // Repeat until user quits    
}

}

2 Answers

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

:point_right: You might be using the wrong command for that file type.

To compile a C# source file, you would use the command: "mcs Program.cs". If the compilation is successful, it would create a CIL image file named "Program.exe".

Then to run that compiled output file you would use: "mono Program.exe".

Ron Lemke
Ron Lemke
2,037 Points
Ron Lemke
Ron Lemke
2,037 Points

I had the same problem, but after I logged out of treehouse and came back in, the problem was gone. Not sure what part of that fixed the problem, but it worked for me.