[ACCEPTED]-How can I mark a specific parameter as obsolete/deprecated in C#?-obsolete

Accepted answer
Score: 27

Short answer:

You will need to create a new nethod with 28 the new signature, and mark the current 27 as obsolete.

Longer answer

What you want to avoid at all 26 cost is a code break! Then, particularly 25 in a company framework, you want to advertise 24 that your method will no longer be supported, for 23 example, but you do not want to be responsible 22 for depending solutions to crash because 21 of an architecture or design decision or 20 your side, right?

The ObsoleteAttribute class will do the 19 trick for you.

Once a class member marked 18 as obsolete, a warning will be raised on 17 the client-side, the ones who use your framework, to 16 continue that way, or even one of your colleague 15 under the same project.

public class MyClass {
    [Obsolete("This method should no longer be used, please use MyNewMethod() instead.")]
    public void MyMethod(string name, long phoneNumber, long faxNumber) { 
    }

    public void MyNewMethod(string name, long phoneNumber, long faxNumber, string email) { 
    }
}

This will advertise 14 that MyMethod is no longer supported throughout 13 your code users.

After a certain period of 12 time, reasonable enough to allow everyone 11 to change his/her code, you may tell this 10 attribute to throw an error message when 9 your obsolete method is still used in the 8 code.

public class MyClass {
    [Obsolete("This method should no longer be used, please use MyNewMethod() instead.", true)]
    public void MyMethod(string name, long phoneNumber, long faxNumber) { 
    }

    public void MyNewMethod(string name, long phoneNumber, long faxNumber, string email) { 
    }
}

By setting the second ObsoleteAttribute class constructor 7 parameter to true, you tel the compiler to advertise 6 the use of this method as an error.

After 5 some time only, you can completely remove 4 your method from your code to clean it up 3 a little. This is part of the refactoring 2 methods encouraged by the Agile Software 1 Development methodology.

Does this help?

Score: 8

Yes, I think the only way is to create a 2 new method without the parameter and mark 1 the original one with ObsoleteAttribute.

Score: 8

With the Obsolete attribute:

[Obsolete("Please use void AnotherMethod() instead", false)]
void SomeMethod(Int32 data){
}

The Boolean 4 in the attribute tells the compiler to generate 3 a warning, if you change it to true the 2 compiler will generate an error. See here for 1 the documentation on it.

Score: 6

Yes. You can only mark types and members of types as obsolete, not individual parameters. You 3 could, however, overload the method, thereby 2 keeping the same name and mark the old one 1 as obsolete:

class Act
{
    [Obsolete("DoSomething(int, int) is obsolete", false /*warn only*/)]
    public void DoSomething(int i, int j)
    {
    }

    public void DoSomething(int i)
    {
    }
}
Score: 2

I think it would be best to create a new 5 method.

What do you mean by making the parameter 4 obsolete? Does this depend on a specific 3 value for that argument? When you call a 2 method, you always have to specify the argument 1 anyway.

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