How to: Display Command Line Arguments (C# Programming Guide)

Arguments provided to an executable on the command-line are accessible through an optional parameter to Main. The arguments are provided in the form of an array of strings. Each element of the array contains one argument. White-space between arguments is removed. For example, consider these command-line invocations of a fictitious executable:

Input on Command-line Array of strings passed to Main
executable.exe a b c "a"

"b"

"c"
executable.exe one two "one"

"two"
executable.exe "one two" three "one two"

"three"

Note

When you are running an application in Visual Studio, you can specify command-line arguments in the Debug Page, Project Designer.

Example

This example displays the command line arguments passed to a command-line application. The output shown is for the first entry in the table above.

class CommandLine
{ 
    static void Main(string[] args)
    {
        // The Length property provides the number of array elements.
        Console.WriteLine($"parameter count = {args.Length}");

        for (int i = 0; i < args.Length; i++)
        {
            Console.WriteLine($"Arg[{i}] = [{args[i]}]");
        }
    }
}
/* Output (assumes 3 cmd line args): 
    parameter count = 3
    Arg[0] = [a]
    Arg[1] = [b]
    Arg[2] = [c]
*/

See also