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Processing Command-Line Arguments

Now that you better understand the return value of the Main() method, let’s examine the incoming

array of string data. Assume that you now wish to update your application to process any possible

command-line parameters. One way to do so is using a C# for loop (do note that C#’s iteration con-

structs will be examined in some detail near the end of this chapter):

static int Main(string[] args)

{

...

// Process any incoming args.

for(int i = 0; i < args.Length; i++)

Console.WriteLine("Arg: {0}", args[i]);

Console.ReadLine();

return -1;

}

Here, you are checking to see whether the array of strings contains some number of items

using the Length property of System.Array. As you’ll see in Chapter 4, all C# arrays actually alias the

System.Array type, and therefore share a common set of members. As you loop over each item in

the array, its value is printed to the console window. Supplying the arguments at the command line

is equally as simple, as shown in Figure 3-2.

Figure 3-2.

Supplying arguments at the command line

As an alternative to the standard for loop, you may iterate over an incoming string array using

the C# foreach keyword. Here is some sample usage: