An error in the attribute section of the program. Please help

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C#

#define DEBUG
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConditionalAttribute
{
    public class MyClass : Attribute
    {
        [Conditional("DEBUG")]
        public static void Message(string msg)
        {
            Console.WriteLine(msg);
        }
    }
    class Test
    {
        static void function1()
        {
            MyClass.Message("In function 1.");
            function2();
        }
        static void function2()
        {
            MyClass.Message("In function 2:");
        }
        public static void Main(string[] args)
        {
            MyClass.Message("In Main function. ");
            function1();
            Console.ReadKey();
        }
    }
}

Posted 28-Sep-15 19:46pm

Derin J Tom

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Derin J Tom 29-Sep-15 1:48am

I am new to the C# world. I am learning it myself. I am getting an error when the classes are declared in the namespace. There were no errors when I removed the namespace. Please help.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 29-Sep-15 2:25am

What is that error?

Derin J Tom 29-Sep-15 3:59am

Error 1 'ConditionalAttribute' is not an attribute class

I am not getting any error when the classes are declared without the namespace.

Please help.

Krunal Rohit 29-Sep-15 1:55am

What error occurred ?

-KR

Derin J Tom 29-Sep-15 4:00am

Error 1 'ConditionalAttribute' is not an attribute class

I am not getting any error when the classes are declared without the namespace.

Please help.

1 solution

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OriginalGriff · Accepted Answer · 2015-09-28T20:36:00

Couple of things:
Don't use #define in C# - it doesn't work like it does in C or C++. #define values can only be used in #if and suchlike, not to affect "normal" code

You are deriving MyClass from the abstract class Attribute - but you aren't implementing any of the required methods.
Since you are a beginner, just remove the derivation:

C#

public class MyClass
{
    [Conditional("DEBUG")]
    public static void Message(string msg)
    {
        Console.WriteLine(msg);
    }
}

And ensure you are compiling the debug version of your code.

"Learning it myself" is not a good solution: get a book, or better go on a course - and follow it from the beginning to the end. Just trying to learn it as you go along is a good way to confuse yourself, as I think you have here. C# shares a lot of similar syntax with C and C++, but it is a very different language under the hood, and you shouldn't try to use C or C++ methodology and thinking or it will get very confusing!