C#

Two string values are considered equal when one of the following is true:

    * Both values are null.
    * Both values are non-null references to string instances that have identical lengths and identical characters in each character position.

Colin Angus Mackay wrote:

Incorrect. Here is what reflector has to say on the subject:
public static readonly string Empty;

That means there is only one representation ever in memory. It is not copied, it is referenced. That means they will ALL point to the same memory address.

((object)"") == String.Empty :::: False
("") == String.Empty         :::: True

((object)"") == String.Empty :::: True
("") == String.Empty         :::: True

George_George wrote:

What do you mean "It is not copied, it is referenced"? Could you show some pseude code please?

George_George wrote:

"create two different reference type variables and they have same memory reference"

George_George wrote:

you create a base type variable (reference type) and a derived type variable (reference type), they are of different types but pointing to the same memory address

George_George wrote:

I am doing input parameter checking for a string type, and string value except empty is valid. My function is provided to outer client to call. Sometimes I find to check null is not enough, I also need to check String.Empty.

Member 3754905 wrote:

How can I instantiate a list for the type found above? something like (doesn't work):

public class CreatableTest<T> where T : new()
{
  public static T CreateTestObject()
  {
    return new T();
  }
}