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C#利用Attribute实现面向切面编程（AOP）

article 2025/1/7 14:08:08

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1.定义自定义 Attribute

using System;

[AttributeUsage(AttributeTargets.Method)]
public class LogAttribute : Attribute
{
    public void BeforeMethod()
    {
        Console.WriteLine("Before method execution.");
    }

    public void AfterMethod()
    {
        Console.WriteLine("After method execution.");
    }
}

2.创建业务类和方法

public class BusinessClass
{
    [Log]
    public void DoSomething()
    {
        Console.WriteLine("Doing something...");
    }
}

3.实现 AOP 框架

using System.Reflection;

public class AopFramework
{
    public static void InvokeMethod(object obj, MethodInfo method)
    {
        var attributes = method.GetCustomAttributes(typeof(LogAttribute), false);
        foreach (var attribute in attributes)
        {
            ((LogAttribute)attribute).BeforeMethod();
        }

        method.Invoke(obj, null);

        foreach (var attribute in attributes)
        {
            ((LogAttribute)attribute).AfterMethod();
        }
    }
}

4.调用

class Program
{
    static void Main()
    {
        var businessObj = new BusinessClass();
        var method = businessObj.GetType().GetMethod("DoSomething");
        AopFramework.InvokeMethod(businessObj, method);
    }
}