C# 反射

反射，Reflection，通过它我们可以在运行时获得各种信息，如程序集、模块、类型、字段、属性、方法和事件

通过对类型动态实例化后，还可以对其执行操作

简单来说就是用string可以在runtime为所欲为的东西，实际上就是一个.net framework内建的万能工厂

一般用于插件式框架程序和设计模式的实现，当然反射是一种手段可以充分发挥其能量来完成你想做的任何事情

Demo

新建一类库,代码如下：

namespace RefTest2{ public class Class1 { private string name; private int age; public Class1(string Name, int Age) { name = Name; age = Age; } public void ChangeName(string NewName) { name = NewName; } public void ChangeAge(int NewAge) { age = NewAge; } public override string ToString() { return string.Format("Name:{0},Age:{1}", name, age); } }}

#region 反射应用
        private void button14_Click(object sender, EventArgs e)
        {
            string path = @"G:/Linq/Linq/RefTest2/bin/Debug/RefTest2.dll";
            Assembly tmpAss = Assembly.LoadFrom(path);
                      //遍历程序集内所有的类型，并实例化
            Type[] tmpTypes = tmpAss.GetTypes();
            foreach (Type tmpType in tmpTypes)
            {
                //获取第一个类型的构造函数信息
                ConstructorInfo[] tmpConsInfos = tmpType.GetConstructors();
                foreach (ConstructorInfo tmpConsInfo in tmpConsInfos)
                {
                    //为构造函数生成调用的参数集合
                    ParameterInfo[] tmpParamInfos = tmpConsInfo.GetParameters();
                    object[] tmpParams = new object[tmpParamInfos.Length];
                    for (int i = 0; i < tmpParamInfos.Length; i++)
                    {
                        tmpParams[i] = tmpAss.CreateInstance(tmpParamInfos[i].ParameterType.FullName);
                        if (tmpParamInfos[i].ParameterType.FullName == "System.String")
                        {
                            tmpParams[i] = "Clark";
                        }
                    }

                    //实例化对象
                    object tmpObj = tmpConsInfo.Invoke(tmpParams);
                    //Console.WriteLine(tmpObj);
                    MessageBox.Show(tmpObj.ToString());

                    //获取所有方法并执行
                    foreach (MethodInfo tmpMethod in tmpType.GetMethods())
                    {
                        //为方法的调用创建参数集合
                        tmpParamInfos = tmpMethod.GetParameters();
                        tmpParams = new object[tmpParamInfos.Length];
                        for (int i = 0; i < tmpParamInfos.Length; i++)
                        {
                            tmpParams[i] = tmpAss.CreateInstance(tmpParamInfos[i].ParameterType.FullName);
                            if (tmpParamInfos[i].ParameterType.FullName == "System.String")
                            {
                                tmpParams[i] = "Clark Zheng";
                            }
                            if (tmpParamInfos[i].ParameterType.FullName == "System.Int32")
                            {
                                tmpParams[i] = 27;
                            }
                        }
                        tmpMethod.Invoke(tmpObj, tmpParams);
                    }

                    //调用完方法后再次打印对象，比较结果
                    //Console.WriteLine(tmpObj);
                    MessageBox.Show(tmpObj.ToString());
                }
            }
        #endregion