Set nullable explicitly in a generic method.

CSharp · Console

/Program.cs

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

public class Program
{
	public static void Main()
	{
		var p = new Program();
		
		var list = p.CreateEnumerable<int?>(1, 2, 3, 4);
		p.DoWork(list);
	}

	public void DoWork(IEnumerable<int?> enumerable)
	{
		enumerable.ToList().ForEach(x => 
		{
			Console.WriteLine(x);
		});
	}
	
	public IEnumerable<T> CreateEnumerable<T>(params T[] items)
    {
        if (items == null)
            yield break;

        foreach (T mitem in items)
            yield return mitem;
    }
}