Question

Lets suppose i have a field with short defined getter setter like following:

public double MyDouble { get; set; }

I want to check this MyDouble value if it is set or not. i can not check like this:

if(MyDouble == null) .... else ....

Because double variables can not get null values. So how can i check this value if it is set or not? Do i have to use a second variable holding the isSet state or is there any default value for the double type?
Thanks.

Answer 1

System.Double is a struct (value type).

It cannot be null.

You neeed to make it nullable:

double? MyDouble { get; set; }

More on Nullable Types : Nullable Types (C# Programming Guide)