Comparing nullable DateTime?

Question

Looking for a better way to compare a nullable date time than the following:

Any suggestions?

// myobject.ExpireDatetime is of DateTime?
//
if (!myob         


        

Answer 1

The compiler lifts variables and generates code to check for nulls.

> new DateTime?()
null
> DateTime.Now > null
false
> DateTime.Now < null
false

> new int?()
null
> 10 >= null
false
> 10 =< null
false
> 10 == null
false
> 10 != null
true

Knowing this you can write simple code.

// d is a DateTime? 
DateTime now = DateTime.Now;

bool after = d > now;
bool before = d < now;
bool today = d?.Date == now.Date;

If d is null everything will be false, else it will work like normal DateTime comparison.