How to use get and set in ASP.NET C# ?

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Hey guys,

I got this code here:

C#

private string _firstName;


    public string FirstName
    {
        get { return _firstName; }
        set { _firstName = value; }

    }

But i don't get how it work I tried to play around with it. I'm assuming that it means if I put a value in the private object named _firstName I can use it inside the public object FirstName even if it's private.

Anyone?

Posted 27-Jan-14 3:28am

KatsuneShinsengumi

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2 solutions

Solution 1

Please read these..

Encapsulation in c#[^]
Encapsulation oops[^]
http://www.dotnetperls.com/encapsulate-field[^]

Posted 27-Jan-14 3:44am

Karthik_Mahalingam

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Pete O'Hanlon · Accepted Answer · 2014-01-27T03:47:00

Solution 2

The private string is a backing field that is set when you do FirstName = "...." in your code. Effectively what happens is that this code translates into a hidden set call (that's what the compiler does under the surface). The pseudo-logic looks like this:

C#

public void FirstName_Set(string value)
{
  _firstName = value;
}

By doing this, we ensure that _firstName is hidden from outside classes (we encapsulate it). Of course, if all you are doing is setting a simple value and you aren't doing anything like serialization or more complex forms of validation, then you might as well just have

C#

public string FirstName;

Posted 27-Jan-14 3:47am

Pete O'Hanlon

Updated 27-Jan-14 4:01am

v2

Comments

KatsuneShinsengumi 27-Jan-14 9:55am

One more question, what does the code "value" do? Sorry I'd just started ASP.NET and C# like last week.

Pete O'Hanlon 27-Jan-14 10:02am

You can think of "value" as being a magic variable - it's automatically applied to the set part of a property to pass in the value. I have updated my pseudo-logic to show you where it appears.

KatsuneShinsengumi 27-Jan-14 10:10am

Thanks, although the changes gets me confused, your original post gives me the idea of it's purpose.