Extension method resolution with nullable value type params

Question

public static class Extension
{
    public static void Test(this DateTime? dt)
    {
    }
}


void Main()
{
    var now = DateTime.Now;
    Extension.Test(now); //          


        

Answer 1

you need to create your variable now with the corret type nullable like this:

 DateTime? dateTime = DateTime.Now;
 dateTime.Test();