如何通过/检查指定的 arguments？

Question

I'm currently writing a C# console application and would like to give the user the ability to chose what feature to be executed. For example, when I start MyApp.exe -help the help should show, or when I start MyApp.exe -shutdown the computer should shutdown. How do I pass/check that?

My current code doesn't seem to work:

static void Main(string[] args)
{
        if (args.Equals("-help"))
        {
            Console.WriteLine("Some help here...");
        }
}

Answer 1

    static void Main(string[] args)
    {
        ProcesArguments(args);
    }

    static void ProcesArguments(string[] parameters)
    {
        foreach (var parameter in parameters)
        {
            switch (parameter.ToLower())
            {
                case "-help":
                    DisplayHelp();
                    break;
                case "-reboot":
                    RebootComputer();
                    break;
            }
        }
    }

    static void DisplayHelp()
    {
        Console.WriteLine($"Syntax: {System.AppDomain.CurrentDomain.FriendlyName} <Parameter>");
        // ...
    }

    static void RebootComputer()
    {
        // ...
    }

Answer 2

Args is an array, so you have to reference the argument by its index. So args[0] corresponds to the first argument passed in. In addition, check the array length first to ensure an argument was even provided before you try to access it.

static void Main(string[] args)
{
    if (args.Length > 0 && args[0] == "-help")
    {
        Console.WriteLine("Some help here...");
    }
}

Answer 3

args is an array so you need to look for -help occurrence in it. You can achieve it using String.Contains() method.

static void Main(string[] args)
{
    if (args.Contains("-help"))
    {
        Console.WriteLine("Some help here...");
    }
}