Simple argument pasrer class for C#.

ArgumentParser.cs

// Copyright 2018 zekro Development
// 
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// a copy of this software and associated documentation files (the "Software"), 
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// 
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/// <summary>
/// ArgumentParser - A simple class to parse start arguments 
/// by key-value-principle.
/// </summary>
class ArgumentParser
{
    private List<string> _args;

    /// <summary>
    /// Cretae instance of ArgumentParser.
    /// </summary>
    /// <param name="args">Start arguments</param>
    public ArgumentParser(string[] args)
    {
        _args = new List<string>(args);
    }

    /// <summary>
    /// Get the first position of the first found key in the arguments list.
    /// Returns -1 if key is not existent.
    /// </summary>
    /// <param name="keys">Key(s) to get positions of.</param>
    /// <returns>Position or -1 if not existent.</returns>
    public int GetKeyPos(params string[] keys)
    {
        foreach (string key in keys)
        {
            int currInd = _args.IndexOf(key);
            if (currInd > -1)
                return currInd;
        }
        return -1;
    }

    /// <summary>
    /// Check if one of the passed keys are existent in the argument list.
    /// </summary>
    /// <param name="keys">Key(s) to check for.</param>
    /// <returns>True if one of the given keys is existent.</returns>
    public bool CheckForKey(params string[] keys)
    {
        return (GetKeyPos(keys) > -1);
    }

    /// <summary>
    /// Get the specified value following the first found key in the arguments 
    /// list if the key is existent.
    /// </summary>
    /// <param name="keys">Key(s) to search for.</param>
    /// <returns>Value following the key.</returns>
    public string GetValueByKey(params string[] keys)
    {
        int pos = GetKeyPos(keys);
        if (pos > -1 && _args.Count > pos + 1)
            return _args[pos + 1];
        else
            return null;
    }
}