C#知识点-反射

一、开发环境

操作系统：Win7

编译器：VS2010

.net版本：.net4.0

二、项目结构

三、开发流程

0.编写实体类

namespace ReflectDemo

{

    public class Bird

    {

        public string _id;

        public string Name { get; set; }

        public int Age { get; set; }

        public void Eat()

        {

            Console.WriteLine("我是个吃货");

        }

        public void Eat(string birdName)

        {

            Console.WriteLine("我和" + birdName + "都是个吃货");

        }

        public Bird()

        {

        }

        public Bird(string name, int age)

        {

            this.Name = name;

            this.Age = age;

        }

        public void BirdIntroducion()

        {

            Console.WriteLine("我叫" + Name + ",我" + Age + "岁了");

        }

    }

}

1.获取Assembly对象

namespace ReflectDemo

{

    public class GetAssembly

    {

        public void MethodGetAllAssembly()

        {

            //获取当前应用程序域中的Assembly

            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();

            Console.WriteLine(assemblies.ToString());

        }

        public void MethodGetCurrentObjAssembly()

        {

            //获取当前对象所在的Assembly

            Assembly assembly = this.GetType().Assembly;

            Console.WriteLine(assembly.ToString());

        }

        public void MethodGetFromBin()

        {

            //获取bin目录下的指定Assembly

            Assembly assembly = Assembly.LoadFrom("ReflectDemo.exe");

            Console.WriteLine(assembly.ToString());

        }

    }

}

2.获取Type对象

namespace ReflectDemo

{

    public class GetType

    {

        public void MethodGetByClassName()

        {

            //通过类名获得Type

            Type type = typeof(Bird);

            Console.WriteLine(type.ToString());

        }

        public void MethodGetByObjName()

        {

            //通过对象名获得Type

            Bird bird = new Bird();

            Type type = bird.GetType();

            Console.WriteLine(type.ToString());

        }

        public void MethodGetByFullName()

        {

            //通过 命名空间.类名获取

            Assembly assembly = this.GetType().Assembly;

            Type type = assembly.GetType("ReflectDemo.Bird");

        }

        public void MethodGetAll()

        {

            //获取Assembly中所有的类型

            Assembly assembly = this.GetType().Assembly;

            Type[] types = assembly.GetTypes();

        }

        public void MethodGetAllPublic()

        {

            //获取Assembly中定义的所有public类

            Assembly assembly = this.GetType().Assembly;

            Type[] types = assembly.GetExportedTypes();

        }

    }

}

3.获取Type成员对象

3.1获取字段信息

namespace ReflectDemo

{

    public class GetFieldInfo

    {

        public void MethodGetPublicField()

        {

            Bird bird = new Bird()

            {

                _id = "1"

            };

            Type type = bird.GetType();

            FieldInfo idInfo = type.GetField("_id");

            string id = idInfo.GetValue(bird).ToString();

            Console.WriteLine(id);

            idInfo.SetValue(bird, "2");

            string newId = bird._id;

            Console.WriteLine(newId);

        }

    }

}

3.2获取属性信息

namespace ReflectDemo

{

    public class GetPropertyInfo

    {

        public void MethodGetAllPublic()

        {

            Bird bird = new Bird()

            {

                Name = "小黄"

            };

            Type type = bird.GetType();

            PropertyInfo nameInfo = type.GetProperty("Name");

            string name = nameInfo.GetValue(bird, null).ToString();

            Console.WriteLine(name);

            nameInfo.SetValue(bird, "小黄黄", null);

            Console.WriteLine(bird.Name);

        }

    }

}

3.3获取方法信息

namespace ReflectDemo

{

    public class GetMethodInfo

    {

        public void MethodGetWithNoParas()

        {

            Bird bird = new Bird();

            Type type = bird.GetType();

            MethodInfo eatMethodInfo = type.GetMethod("Eat", new Type[] { });

            eatMethodInfo.Invoke(bird, null);

        }

        public void MethodWithParas()

        {

            Bird bird = new Bird();

            Type type = bird.GetType();

            MethodInfo eatMethodInfo = type.GetMethod("Eat", new Type[] { typeof(string) });

            eatMethodInfo.Invoke(bird, new object[] { "小黑" });

        }

    }

}

3.4获取构造函数

namespace ReflectDemo

{

    public class GetConstructorInfo

    {

        public void MethodGetActivator()

        {

            Type type = typeof(Bird);

            Bird bird = Activator.CreateInstance(type, new object[] { "小白", 3 }) as Bird;

            bird.BirdIntroducion();

        }

        public void MethodGetConstructor()

        {

            Type type = typeof(Bird);

            ConstructorInfo ctor = type.GetConstructor(new Type[] { typeof(string), typeof(int) });

            Bird bird = ctor.Invoke(new object[] { "小黑", 5 }) as Bird;

            bird.BirdIntroducion();

        }

    }

}

4.编写控制台程序

namespace ReflectDemo

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("---获取Assembly---");

            GetAssembly getAssembly = new GetAssembly();

            getAssembly.MethodGetAllAssembly();

            getAssembly.MethodGetCurrentObjAssembly();

            getAssembly.MethodGetFromBin();

            Console.WriteLine("\n---获取Type对象---");

            GetType getType = new GetType();

            getType.MethodGetByClassName();

            getType.MethodGetByObjName();

            getType.MethodGetByFullName();

            getType.MethodGetAll();

            getType.MethodGetAllPublic();

            Console.WriteLine("\n---获取字段信息---");

            GetFieldInfo getFieldInfo = new GetFieldInfo();

            getFieldInfo.MethodGetPublicField();

            Console.WriteLine("\n---获取属性信息---");

            GetPropertyInfo getPropertyInfo = new GetPropertyInfo();

            getPropertyInfo.MethodGetAllPublic();

            Console.WriteLine("\n---获取方法信息---");

            GetMethodInfo getMethodInfo = new GetMethodInfo();

            getMethodInfo.MethodGetWithNoParas();

            getMethodInfo.MethodWithParas();

            Console.WriteLine("\n---获取构造函数信息---");

            GetConstructorInfo getConstructorInfo = new GetConstructorInfo();

            getConstructorInfo.MethodGetActivator();

            getConstructorInfo.MethodGetConstructor();

            Console.ReadKey();

        }

    }

}

四、项目说明

1.什么是反射：

(1).在程序运行时，

动态 获取 加载程序集

动态 获取 类型（类，接口）

动态 获取 类型的成员 信息（字段，属性，方法）

(2).在运行时，

动态 创建类型实例，以及 调用 和访问 这些 实例 成员

程序集（Assembly对象）===》类，接口（Type对象）===》类的成员（**Info）

五、其他信息