Is there a C# IN operator?

Question

In SQL, you can use the following syntax:

SELECT *
FROM MY_TABLE
WHERE VALUE_1 IN (1, 2, 3)

Is there an equivalent in C#? The IDE seems to

Answer 1

You can write an extension. I wrote one time ago, for making code like

if(someObject.stringPropertyX.Equals("abc") || someObject.stringPropertyX.Equals("def") || ....){
    //do something
    ...
}else{
   //do something other...
   ....
}

more readable with an extention s.t. one was able to write

if(someObject.stringPropertyX.In("abc", "def",...,"xyz"){
   //do something
   ...
}else{
  //do something other...
  ....
}

Here's the code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Some.Namespace.Extenders
{
    public static class StringExtender
    {
        /// 

        /// Evaluates whether the String is contained in AT LEAST one of the passed values (i.e. similar to the "in" SQL clause)
        /// 
        /// 
        /// list of strings used for comparison
        /// true if the string is contained in AT LEAST one of the passed values
        public static bool In(this String thisString, params string[] values)
        {
            foreach (string val in values)
            {
                if (thisString.Equals(val, StringComparison.InvariantCultureIgnoreCase))
                    return true;
            }

            return false; //no occurence found
        }
    }
}

This is the one specific to my needs at that time, but you may adapt and modify it to match more different types.