Suppose we have the code below. I want to access the element that is highlighted by a comment in the Main() method in the class that has an indexer. The indexer also has a comment in the "set" section of the indexer code describing where the element is to be accessed. If I am missing something, any advice would be much appreciated.

Main():

arrayaccess aa = new arrayaccess();
string a = "karl";
if (a is string)
Console.WriteLine(aa[a]);
else
{
    double d = Convert.ToDouble(a);
    d = Math.Floor(d);
    Console.WriteLine(aa[Convert.ToByte(d)]);
}
//set code
aa[3] = "karl";//the name (string) karl is to be accessed in the indexer of "ArrayClass" class.

class arrayaccess
    {

        private string[] names = new string[] { "carl", "karl", "doe", "john" };
        public string this[object index]
        {
            get
            {
                if (index is string)
                {
                    if (names.Contains(index))
                        return "found";
                    else return "not found";
                }
                else
                {

                    if (Convert.ToByte(index) >= names.Length)
                        throw new IndexOutOfRangeException("Index should be less than or equal to 3");
                    return names[Convert.ToByte(index)];

                }

            }
            set
            {
                //it's easy to do with the get accessor
                if (names.Contains(/*value here*/))//want to access here
                    throw new ArgumentException("Sorry, duplicate"  
                        "values not allowed");
                else names[Convert.ToByte(index)] = value;
            }
        }
}

CodePudding user response：

Use the "value" keyword in your code:

if(names.Contains(value))