.net中 关于反射的详细介绍

class Program
    {
        static void Main(string[] args)
        {
            A a = new A();
            B b = new B();
            if (a is A) 
            {
                Console.WriteLine("a is an A");   //这个打印，因为a 是 A 类型的对象
            }
            if (b is A)
            {
                //这个打印，因为b是B类型的对象，而B类型派生于A类型，由于b对象可以转换为A类型，因此b对象与A类型是兼容的，但是反过来就不成立，例如下面不打印
                Console.WriteLine("b is an A because it is derived from");
            }
            if (a is B)
            {
                //这个不打印
                Console.WriteLine("This won't display , because a not derived from B");
            }
            if (a is object)
            {
                //这个打印
                Console.WriteLine("a is an object");
            }
            Console.ReadKey();
        }
    }
    class A { }
    class B : A { }

 class Program
    {
        static void Main(string[] args)
        {
            A a = new A();
            B b = new B();
            if (a is B)
            {
                b = (B)a;   //由于a变量不是B类型，因此这里将a变量转换为B类型是无效的。
            }
            else
            {
                b = null;
            }

            if (b ==null)
            {
                //这个打印
                Console.WriteLine("The cast in b=(B)a is not allowed");
            }

            //上面使用as运算符，能够把两部合二为一。

            b = a as B;   //as类型先检查强制类型转换的有效性，如果有效，则执行强类型转换过程。这些都在这一句完成。
            if (b == null)
            {
                //这个打印
                Console.WriteLine("The cast in b=(B)a is not allowed");
            }
            Console.ReadKey();
        }
    }
    class A { }
    class B : A { }

  static void Main(string[] args)
        {
            Type t=typeof(StringBuilder);

            Console.WriteLine(t.FullName);  //FullName属性返回类型的全称

            if (t.IsClass)
            {
                Console.WriteLine("is a class"); //打印
            }
            if (t.IsSealed)  //是否为密封类
            {
                Console.WriteLine("is Sealed");  //打印
            }
            Console.ReadKey();

        }

    class MyClass
    {
        int x;
        int y;
        public MyClass(int i, int j)
        {
            x = i;
            y = j;
        }
        public int sum()
        {
            return x + y;
        }
        public bool IsBetween(int i)
        {
            if (x < i && i < y) return true;
            else return false;               
        }
        public void Set(int a, int b)
        {
            x = a;
            y = b;
        }
        public void Set(double a, double b)
        {
            x = (int)a;
            y = (int)b;
        }
        public void Show()
        {
            Console.WriteLine("x:{0},y:{1}",x,y);
        }
    }
    class ReflectDemo
    {
        static void Main(string[] args)
        {
            Type t=typeof(MyClass);   //获取描述MyClass类型的Type对象
            Console.WriteLine("Analyzing methods in "+t.Name);  //t.Name="MyClass"

            MethodInfo[] mi = t.GetMethods();  //MethodInfo对象在System.Reflection命名空间下。
            foreach (MethodInfo m in mi) //遍历mi对象数组
            {
                Console.Write(m.ReturnType.Name); //返回方法的返回类型
                Console.Write(" " + m.Name + "("); //返回方法的名称

                ParameterInfo[] pi = m.GetParameters();  //获取方法参数列表并保存在ParameterInfo对象数组中
                for (int i = 0; i < pi.Length; i++)
                {
                    Console.Write(pi[i].ParameterType.Name); //方法的参数类型名称
                    Console.Write(" "+pi[i].Name);  // 方法的参数名
                    if (i + 1 < pi.Length)
                    {
                        Console.Write(", ");
                    }
                }
                Console.Write(")");
                Console.WriteLine(); //换行
            }

            Console.ReadKey();
        }
    }

class MyClass
    {
        int x;
        int y;
        public MyClass(int i, int j)
        {
            x = i;
            y = j;
        }
        private int sum()
        {
            return x + y;
        }
        public bool IsBetween(int i)
        {
            if (x < i && i < y) return true;
            else return false;               
        }
        public void Set(int a, int b)
        {
            x = a;
            y = b;
        }
        public void Set(double a, double b)
        {
            x = (int)a;
            y = (int)b;
        }
        public void Show()
        {
            Console.WriteLine("x:{0},y:{1}",x,y);
        }
    }
    class ReflectDemo
    {
        static void Main(string[] args)
        {
            Type t=typeof(MyClass);   //获取描述MyClass类型的Type对象
            Console.WriteLine("Analyzing methods in "+t.Name);  //t.Name="MyClass"

            MethodInfo[] mi = t.GetMethods(BindingFlags.DeclaredOnly|BindingFlags.Instance|BindingFlags.Public);  //不获取继承方法，为实例方法，为公开的
            foreach (MethodInfo m in mi) //遍历mi对象数组
            {
                Console.Write(m.ReturnType.Name); //返回方法的返回类型
                Console.Write(" " + m.Name + "("); //返回方法的名称

                ParameterInfo[] pi = m.GetParameters();  //获取方法参数列表并保存在ParameterInfo对象数组中
                for (int i = 0; i < pi.Length; i++)
                {
                    Console.Write(pi[i].ParameterType.Name); //方法的参数类型名称
                    Console.Write(" "+pi[i].Name);  // 方法的参数名
                    if (i + 1 < pi.Length)
                    {
                        Console.Write(", ");
                    }
                }
                Console.Write(")");
                Console.WriteLine(); //换行
            }

            Console.ReadKey();
        }
    }

class MyClass
    {
        int x;
        int y;
        public MyClass(int i, int j)
        {
            x = i;
            y = j;
        }
        private int sum()
        {
            return x + y;
        }
        public bool IsBetween(int i)
        {
            if (x < i && i < y) return true;
            else return false;
        }
        public void Set(int a, int b)
        {
            Console.Write("Inside set(int,int).");
            x = a;
            y = b;
            Show();
        }
        public void Set(double a, double b)
        {
            Console.Write("Inside set(double,double).");
            x = (int)a;
            y = (int)b;
            Show();
        }
        public void Show()
        {
            Console.WriteLine("x:{0},y:{1}", x, y);
        }
    }

    class InvokeMethDemo
    {
        static void Main()
        {
           Type t=typeof(MyClass);
           MyClass reflectOb = new MyClass(10, 20);
           reflectOb.Show();  //输出为： x:10, y:20
           MethodInfo[] mi = t.GetMethods();          
           foreach (MethodInfo m in mi)
           {
               ParameterInfo[] pi = m.GetParameters();

               if (m.Name.Equals("Set", StringComparison.Ordinal) && pi[0].ParameterType == typeof(int))
               {
                   object[] args = new object[2];
                   args[0] = 9;
                   args[1] = 10;
                   //参数reflectOb,为一个对象引用，将调用他所指向的对象上的方法，如果为静态方法这个参数必须设置为null
                   //参数args，为调用方法的参数数组，如果不需要参数为null
                   m.Invoke(reflectOb, args);   //调用MyClass类中的参数类型为int的Set方法，输出为Inside set(int,int).x:9, y:10
               }
           }
           Console.ReadKey();
        }
    }

class MyClass
    {
        int x;
        int y;
        public MyClass(int i)
        {       
            x = y + i;
        }
        public MyClass(int i, int j)
        {           
            x = i;
            y = j;
        }
        public int sum()
        {
            return x + y;
        }
    }

    class InvokeConsDemo
    {
        static void Main()
        {
            Type t = typeof(MyClass);
            int val;
            ConstructorInfo[] ci = t.GetConstructors();  //使用这个方法获取构造函数列表

            int x;
            for (x = 0; x < ci.Length; x++)
            {
                ParameterInfo[] pi = ci[x].GetParameters(); //获取当前构造函数的参数列表
                if (pi.Length == 2) break;    //如果当前构造函数有2个参数，则跳出循环
            }

            if (x == ci.Length)
            {
                return;
            }

            object[] consargs = new object[2];
            consargs[0] = 10;
            consargs[1] = 20;
            object reflectOb = ci[x].Invoke(consargs);  //实例化一个这个构造函数有两个参数的类型对象,如果参数为空，则为null

            //实例化后，调用MyClass中的方法
            MethodInfo[] mi = t.GetMethods(BindingFlags.Public | BindingFlags.DeclaredOnly | BindingFlags.Instance);
            foreach (MethodInfo m in mi)
            {
                if (m.Name.Equals("sum", StringComparison.Ordinal))
                {
                    val = (int)m.Invoke(reflectOb, null);  //由于实例化类型对象的时候是用的两个参数的构造函数，所以这里返回的结构为30
                    Console.WriteLine(" sum is " + val);  //输出 sum is 30
                }
            }

            Console.ReadKey();
        }
    }

 class MyClass
    {
        int x;
        int y;
        public MyClass(int i)
        {
            x = y + i;
        }
        public MyClass(int i, int j)
        {
            x = i;
            y = j;
        }
        public int sum()
        {
            return x + y;
        }
    }

    class Demo
    {
        static void Main()
        {
            Console.WriteLine("hello word !");
            Console.ReadKey();
        }
    }

 class Class3
    {
        static void Main() {

            Assembly asm = Assembly.LoadFrom(@"C:\Users\lenovo\Documents\visual studio 2010\Projects\Reflection_test\ConsoleApplication1\bin\Debug\MyClass.exe");  //加载指定的程序集
            Type[] alltype = asm.GetTypes();  //获取程序集中的所有类型列表
            foreach (Type temp in alltype)
            {
                Console.WriteLine(temp.Name);  //打印出MyClass程序集中的所有类型名称 MyClass , Demo
            }
            Console.ReadKey();      

        }
    }