How do I mark a method as obsolete or deprecated using C#?
The shortest way is by adding the ObsoleteAttribute
as an attribute to the method . Make sure to include an appropriate explanation:
[Obsolete("Method1 is deprecated, please use Method2 instead.")]
public void Method1()
{ … }
You can also cause the compilation to fail, treating the usage of the method as an error instead of warning , if the method is called from somewhere in code like this:
[Obsolete("Method1 is deprecated, please use Method2 instead.", true)]
To mark as obsolete with a warning:
[Obsolete]
private static void SomeMethod()
You get a warning when you use it:
And with IntelliSense:
If you want a message:
[Obsolete("My message")]
private static void SomeMethod()
Here's the IntelliSense tool tip:
Finally if you want the usage to be flagged as an error:
[Obsolete("My message", true)]
private static void SomeMethod()
When used this is what you get:
Note: Use the message to tell people what they should use instead, not why it is obsolete.
Add an annotation to the method using the keyword Obsolete
. Message argument is optional but a good idea to communicate why the item is now obsolete and/or what to use instead.
Example:
[System.Obsolete("use myMethodB instead")]
void myMethodA()
With ObsoleteAttribute
you can mark a method as deprecated. It has three constructors:
[Obsolete]:
is a no parameter constructor and is a default using this attribute.[Obsolete(string message)]:
in this format you can getmessage
of why this method is deprecated.[Obsolete(string message, bool error)]:
in this format message is very explicit buterror
means, in compilation time, compiler must be showing error and cause to fail compiling or not.
For dependency injected methods, Apply the [Obsolete("description")]
attribute to the declaration rather than implementation (:doh: moment for me)
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