How to declare a class instance as a constant in C#?

Question

I need to implement this:

static class MyStaticClass
{
    public const TimeSpan theTime = new TimeSpan(13, 0, 0);
    public static bool IsTooLate(DateTime          


        

Answer 1

Constants have to be compile time constant, and the compiler can't evaluate your constructor at compile time. Use readonly and a static constructor.

static class MyStaticClass
{
  static MyStaticClass()
  {
     theTime = new TimeSpan(13, 0, 0);
  }

  public static readonly TimeSpan theTime;
  public static bool IsTooLate(DateTime dt)
  {
    return dt.TimeOfDay >= theTime;
  }
}

In general I prefer to initialise in the constructor rather than by direct assignment as you have control over the order of initialisation.