Creating a Null Object

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how to Creating a Null Object in c# and what it use???

Posted 20-Nov-11 20:09pm

Shubham Vijay

Updated 20-Nov-11 20:11pm

Sander Rossel

v2

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Sergey Alexandrovich Kryukov 21-Nov-11 2:30am

Object @object = new null; care to try? :-)
--SA

Sander Rossel 21-Nov-11 2:36am

My vote of 1, doesn't compile ;-)

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Sander Rossel · Accepted Answer · 2011-11-20T20:24:00

Solution 1

If you are meaning assigning null to an Object[^]:
This can be used to explicitly eliminate a reference to an Object[^].

C#

SomeObject so = new SomeObject();
so.DoSomething();
so.Dispose();
so = null; // We are now absolutely sure the SomeObject so was referencing to is no longer referenced by so.
// This should theoretically not be necessary in .NET.

Create a Nullable Object:
It is possible to create Nullable types[^] of value types that would otherwise not allow a null reference.

C#

Nullable<int> i1 = null; // Actually has a null reference.
int? i2 = null; // Same as code above.

Posted 20-Nov-11 20:24pm

Sander Rossel

Updated 20-Nov-11 20:31pm

v2

Comments

Sergey Alexandrovich Kryukov 21-Nov-11 2:29am

First sample won't compile. I cannot suspect you don't know this, because you reference an article about nullable types. Also, assigning null even to a nullable object does not have the semantic of default value. Wow! If this is a joke, you should disclose it somewhere, because OP is so naive...
--SA

Sander Rossel 21-Nov-11 2:32am

Argh, you're right SA, got it out of my answer.
That stuff only works in VB... *shame, shame*
It's still early ;)

Sergey Alexandrovich Kryukov 21-Nov-11 2:32am

You should have explained that a null can be assigned only to a variable of a reference type, including the nullable.
--SA

Sander Rossel 21-Nov-11 2:36am

I quote from my (original) answer above: "value types that would otherwise not allow a null reference"