Click here to Skip to main content
15,867,686 members
Articles / Programming Languages / C#

How can we mark a method as deprecated in c#?

Rate me:
Please Sign up or sign in to vote.
4.73/5 (35 votes)
20 Jun 2021CPOL1 min read 65.5K   19   21
How can we mark a method as deprecated?

Many times you want to warn developers that some methods or classes should not be used as they are either replaced or going to be replaced with new versions. This is possible by using the “[Obsolete]” attribute.

In the below class we have a method called as “Method1”. Now let’s say you have created a better improvised version of “Method1” called as “NewMethod1”. You want to send an alert to all your developers who are consuming this class to use “NewMethod1” rather than using “Method1”.

So you can decorate “Method1” with the “[Obsolete]” attribute as shown in the below code.

C#
public class Class1
{
    [Obsolete]
    public void Method1()
    {

    }

    public void NewMethod1()
    {
    }
}

Now if any programmer consumes the above class he will get a warning message as shown in the below figure.

Image 1

In case you want to show some message to the developers you can pass the message in the “Obsolete” attribute as shown in the below code snippet.

C#
[Obsolete("Please use NewMethod1")]
public void Method1()
{

}

If you want to be bit strict and do not developers to use that method, you can pass ‘true” to the “Obsolete” attribute as shown in the below code.

C#
[Obsolete("Please use NewMethod1",true)]
public void Method1()
{

}

Now in case developers try to make a call to “Method1” they will get error and not just a simple warning.

Also have a look at the following practical demonstration on C# Obsolete video: -

Image 2

For Further reading do watch  the below interview preparation videos and step by step video series.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Architect https://www.questpond.com
India India

Comments and Discussions

 
GeneralMy vote of 2 Pin
tbayart28-Jun-21 11:44
professionaltbayart28-Jun-21 11:44 
GeneralRe: My vote of 2 Pin
Shivprasad koirala28-Jun-21 20:38
Shivprasad koirala28-Jun-21 20:38 
GeneralMy vote of 5 Pin
Vincent Radio21-Jun-21 2:38
professionalVincent Radio21-Jun-21 2:38 
QuestionIf you want others to use NewMethod1 rather than Method1, then why dont you delete Method1? Pin
devenendra.72-Jan-18 3:22
devenendra.72-Jan-18 3:22 
AnswerRe: If you want others to use NewMethod1 rather than Method1, then why dont you delete Method1? Pin
Shivprasad koirala3-Jan-18 5:31
Shivprasad koirala3-Jan-18 5:31 
GeneralMy vote of 1 Pin
Member 852840918-Aug-13 6:09
Member 852840918-Aug-13 6:09 
GeneralMy vote of 1 on Your Vote of 1 Pin
Keith Barrow19-Aug-13 4:54
professionalKeith Barrow19-Aug-13 4:54 
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Member 852840921-Aug-13 4:18
Member 852840921-Aug-13 4:18 
I think the author's purpose is to advertise his website.
That's why I say not worth.
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Keith Barrow21-Aug-13 4:21
professionalKeith Barrow21-Aug-13 4:21 
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Shivprasad koirala21-Aug-13 5:57
Shivprasad koirala21-Aug-13 5:57 
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Keith Barrow21-Aug-13 22:42
professionalKeith Barrow21-Aug-13 22:42 
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Shivprasad koirala21-Aug-13 5:58
Shivprasad koirala21-Aug-13 5:58 
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Shivprasad koirala21-Aug-13 5:59
Shivprasad koirala21-Aug-13 5:59 
GeneralRe: My vote of 1 on Your Vote of 1 Pin
Member 852840921-Aug-13 10:26
Member 852840921-Aug-13 10:26 
GeneralMy vote of 4 Pin
SriramNidamanuri15-Aug-13 19:49
SriramNidamanuri15-Aug-13 19:49 
GeneralMy vote of 5 Pin
Humayun Kabir Mamun14-Aug-13 23:10
Humayun Kabir Mamun14-Aug-13 23:10 
GeneralMy vote of 5 Pin
DrABELL10-Aug-13 15:37
DrABELL10-Aug-13 15:37 
GeneralMy vote of 5 Pin
R.Hari Prasath1-Aug-13 23:46
R.Hari Prasath1-Aug-13 23:46 
GeneralMy vote of 5 Pin
Matej Vilim21-Jul-13 23:48
Matej Vilim21-Jul-13 23:48 
GeneralMy vote of 5 Pin
Cindy Meister17-Jul-13 3:39
Cindy Meister17-Jul-13 3:39 
GeneralMy vote of 5 Pin
dxs75315-Jul-13 1:07
dxs75315-Jul-13 1:07 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.