CODEWITHSUNDEEP
c#.net
Sam Walker
Sam Walker

Reputation: 31

.NET already contains a definition for event variable starting with add_

I'm struggling to understand why these errors/warnings are occurring the below. Most importantly the error, because it's blocking the compile. I can "fix" the error by following the proposed naming convention in the messages and begin the variables with upper case characters. But I just don't understand why .NET is throwing the error.

Severity Code Description Project File Line Suppression State
Error CS0102 The type 'Class1' already contains a definition for 'add_a' ClassLibrary1 ClassLibrary1\Class1.cs 10 Active
Message IDE1006 Naming rule violation: These words must begin with upper case characters: add_a ClassLibrary1 ClassLibrary1\Class1.cs 8 Active
Message IDE1006 Naming rule violation: These words must begin with upper case characters: add_a ClassLibrary1 ClassLibrary1\Class1.cs 8 Active
Message IDE1006 Naming rule violation: These words must begin with upper case characters: a ClassLibrary1 ClassLibrary1\Class1.cs 10 Active
Message IDE1006 Naming rule violation: These words must begin with upper case characters: a ClassLibrary1 ClassLibrary1\Class1.cs 10 Active 
namespace ClassLibrary1
{
    public class Class1
    {
        public event myHandler add_a;

        public event myHandler a;

        public delegate void myHandler(object sender, EventArgs e);
    }
}

Upvotes: 2

Views: 62

Answers (1)

Sam Walker
Sam Walker

Reputation: 31

Copying Charlieface comment, which is the answer.

An event implies internal methods such as add_YourEvent and remove_YourEvent so there is a naming clash.

See the spec with reserved names for events https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/classes#143103-member-names-reserved-for-events

Upvotes: 0

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