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What are obsolete attributes in C#?
If a method has an obsolete attribute, then the compiler issues a warning in the code after it is compiled.
When a new method is being used in a class and if you still want to retain the old method in the class, you may mark it as obsolete by displaying a message the new method should be used, instead of the old method.
The following is an example showing how obsolete attribute is used −
using System;
public class Demo {
[Obsolete("Old Method shouldn't be used! Use New Method instead", true)]
static void OldMethod() {
Console.WriteLine("This is the old method!");
}
static void NewMethod() {
Console.WriteLine("This is the new method!");
}
public static void Main() {
OldMethod();
}
}As we have set the warning message above, it will show the following warning −
Compilation failed: 1 error(s), 0 warnings error CS0619: `Demo.OldMethod()' is obsolete: `Old Method shouldn't be used! Use New Method instead'
Updated on 20-Jun-2020 16:59:07
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