What does public DateTime? DateOfBirth {get; set;} mean?

  • Thread starter Thread starter RayLopez99
  • Start date Start date
R

RayLopez99

I saw this code recently:

public class MyClass
{
public string MyString;
public DateTime? DateOfBirth {get; set;}

public MyClass (string S, DateTime? dateOfBirth)
{
MyString = S;
DateOfBirth = dateOfBirth;
}
}

What does the "?" parameter stand for? Does this mean assignment of a
DateTime is optional? I thought you can't do that in C#

RL
 
RayLopez99 said:
I saw this code recently:

public class MyClass
{
public string MyString;
public DateTime? DateOfBirth {get; set;}

public MyClass (string S, DateTime? dateOfBirth)
{
MyString = S;
DateOfBirth = dateOfBirth;
}
}

What does the "?" parameter stand for? Does this mean assignment of a
DateTime is optional? I thought you can't do that in C#

RL
Click to expand...

It means DateOfBirth is of type Nullable<DateTime> rather than DateTime.
DateOfBirth can take on a value of null, in otherwords. DateTime as a
structure would not normally allow this.

Mike
 
It means DateOfBirth is of type Nullable<DateTime> rather than DateTime.
  DateOfBirth can take on a value of null, in otherwords.  DateTime as a
structure would not normally allow this.

Mike
Click to expand...

I did not know this, thanks for the info. Does that mean that upon
initialization the value defaults to null, or does it still default to
MinValue or 0?
 
I did not know this, thanks for the info. Does that mean that upon
initialization the value defaults to null, or does it still default to
MinValue or 0?
Click to expand...

Write a quick program to test it.
 
It means DateOfBirth is of type Nullable<DateTime> rather than DateTime.
  DateOfBirth can take on a value of null, in otherwords.  DateTime as a
structure would not normally allow this.

Mike
Click to expand...

Thanks FTM! I have dealt with nullable types in C# and this makes
sense.

RL
 
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