程序的属性部分中的错误。请帮忙 [英] An error in the attribute section of the program. Please help

问题描述

#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();
        }
    }
}

推荐答案

几件事：

不要在C＃中使用#define - 它不像在C或C ++中那样工作。 #define值只能在#if等中使用，不会影响普通代码



你导出 MyClass 来自抽象类属性 - 但是你没有实现任何必需的方法。

既然你是初学者，只需删除推导：

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:

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

并确保您正在编译代码的调试版本。



自己学习不是一个好的解决方案：拿一本书，或者更好地继续学习 - 并从头到尾跟着它。试着去学习它是一种混淆自己的好方法，因为我认为你在这里。 C＃与C和C ++共享许多类似的语法，但它是一种非常不同的语言，你不应该尝试使用C或C ++方法和思考，否则它会变得非常混乱！

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!

这篇关于程序的属性部分中的错误。请帮忙的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！