How can I make my string property nullable?

Question

I want to make the Middle Name of person optional. I have been using C#.net code first approach. For integer data type its easy just by using ? operator to make

Answer 1

C# 8.0 is published now so you can make reference types nullable too. For this you have to add

#nullable enable

Feature over your namespace. It is detailed here

For example something like this will work:

#nullable enable
namespace TestCSharpEight
{
  public class Developer
  {
    public string FullName { get; set; }
    public string UserName { get; set; }

    public Developer(string fullName)
    {
        FullName = fullName;
        UserName = null;
    }
}}

Also you can have a look this nice article from John Skeet that explains details.

Answer 2

string is by default Nullable ,you don't need to do anything to make string Nullable

Answer 3

It's not possible to make reference types Nullable. Only value types can be used in a Nullable structure. Appending a question mark to a value type name makes it nullable. These two lines are the same:

int? a = null;
Nullable<int> a = null;

Answer 4

string type is a reference type, therefore it is nullable by default. You can only use Nullable<T> with value types.

public struct Nullable<T> where T : struct

Which means that whatever type is replaced for the generic parameter, it must be a value type.

Answer 5

System.String is a reference type so you don't need to do anything like

Nullable<string>

It already has a null value (the null reference):

string x = null; // No problems here

Answer 6

String is a reference type and always nullable, you don't need to do anything special. Specifying that a type is nullable is necessary only for value types.