Question

List<string> arguments = new List<string>(Environment.GetCommandLineArgs().Skip(1).Take(4));
int variant = consoleOptions.HandleInput(arguments);

public int HandleInput(List<string> input)
{
        int variant = 0;

        //for (int i = 0; i < input.Count; i++)
        //{
        //    if (input[i].Contains("-s"))
        //    {
        //         variant = 1; 
        //    }
        //}

        if (input[0].Contains("-s"))
        {
            variant = 1; 

            if (!String.IsNullOrWhiteSpace(input[1]) && !String.IsNullOrWhiteSpace(input[2]))
            {
                variant = 2;        
            }

            if (!String.IsNullOrWhiteSpace(input[3]))
            {
                variant = 3;
            }
        }
        return variant;
}

I’m starting my application from Commandline.
Then I get a List of Strings (max 4).

What I want to do now is:

if the first String in List is “-s” then variant = 1

if the second and third string isn’t Empty then variant = 2

if the fourth string isn’t Empty then variant = 3

I tried some things (Code above), but the problem is, if I only get the first String (one item),
The Compiler crashes on other place (checking Second string, cause Index not accessible)..

What would be the best method?

Answer 1

The Take(4) doesn’t guarantee that you’ll have 4 elements, it just means you won’t have more than 4. So you have to check the list length.

if (input.Count >= 1 && input[0].Contains("-s"))
{
    return 1;
}
if (input.Count >= 3)
{ 
    return 2;
}
if (input.Count >= 4)
{
    return 3;
}

return 0; //what do you return if none of the conditions are met?