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"


executable.exe one two "one"

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



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


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
        System.Console.WriteLine("parameter count = {0}", args.Length);

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

See Also

C# Programming Guide
Command-line Building With csc.exe
Main() and Command-Line Arguments
How to: Access Command-Line Arguments Using foreach
Main() Return Values