属性类能不能实现这种功能？
比如

C# code

class Log(){    bool Save=false;    SaveLog(String Log)    {        if (Save)        {             // ...        }    }}class OtherClass(){    SaveLog("Log1");    [DEBUG]    SaveLog("Log2");}

只有加上[DEBUG]才允许保存日志？

[解决办法]
没这样玩过，看楼下的

[解决办法]
没产生过这样的想法...
[解决办法]
为什么不给SaveLog为个参数呢
[解决办法]
貌似楼主想要实现的效果对同一个方法无法区分
定义属性类后可以修饰类或者方法
但是一旦修饰之后类或者方法就确立了这种属性
比如WebMethod，Serializable一旦被修饰了就拥有了这种属性
并不能在运行时出现两种差异，楼主的效果还是方法重载才能实现。

[解决办法]
晕.
你直接传个参数标识一下不就行了.非要这么麻烦干啥!

想自定义(扩展)元数据?

C# code

using System;using System.Reflection;namespace CustomAttrCS {    // An enumeration of animals. Start at 1 (0 = uninitialized).    public enum Animal {        // Pets.        Dog = 1,        Cat,        Bird,    }    // A custom attribute to allow a target to have a pet.    public class AnimalTypeAttribute : Attribute {        // The constructor is called when the attribute is set.        public AnimalTypeAttribute(Animal pet) {            thePet = pet;        }        // Keep a variable internally ...        protected Animal thePet;        // .. and show a copy to the outside world.        public Animal Pet {            get { return thePet; }            set { thePet = Pet; }        }    }    // A test class where each method has its own pet.    class AnimalTypeTestClass {        [AnimalType(Animal.Dog)]        public void DogMethod() {}        [AnimalType(Animal.Cat)]        public void CatMethod() {}        [AnimalType(Animal.Bird)]        public void BirdMethod() {}    }    class DemoClass {        static void Main(string[] args) {            AnimalTypeTestClass testClass = new AnimalTypeTestClass();            Type type = testClass.GetType();            // Iterate through all the methods of the class.            foreach(MethodInfo mInfo in type.GetMethods()) {                // Iterate through all the Attributes for each method.                foreach (Attribute attr in                     Attribute.GetCustomAttributes(mInfo)) {                    // Check for the AnimalType attribute.                    if (attr.GetType() == typeof(AnimalTypeAttribute))                        Console.WriteLine(                            "Method {0} has a pet {1} attribute.",                             mInfo.Name, ((AnimalTypeAttribute)attr).Pet);                }            }        }    }}/* * Output: * Method DogMethod has a pet Dog attribute. * Method CatMethod has a pet Cat attribute. * Method BirdMethod has a pet Bird attribute. */