NP134 null

Question

Hi Guys

NP134 null

In the following program string value is declared as a null. Is there any advantage of declaring string value as a null? Because string is a reference-type variable whereas null is a default value of reference-type variables.

Please explain.

Thank you

using System;

class MainClass

{

public static void Main(string[] args)

{

string formStr = null;

formStr = string.Format("you had {0:C} in your account?", 99989.987);

Console.WriteLine(formStr);

}

/*

you had $99,989.99 in your account?

*/

Alan · Answer

There's no point in assigning formStr a value of null when you're going to assign it a different value in the next line. If I'd been writing that code I would have combined those two lines into one: string formStr = string .Format( you had {0:C} in your account?  99989.987); However it should be noted that local variables (unlike fields) don't have a default value and if you try to use them before the compiler can be certain that they've been assigned a value then the compiler will complain. For this reason many C# deveoplers always give their local variables default values when they're declared as did the developer of the code you posted.

Maha · Answer

Thank you very much for explanation.