C#反射的使用

1、先定义个类，编译成dll,用于调用

nameSpace Test
{
    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);
        }
    }
}

2、测试调用。读取dll中的属性和方法，赋值，并得到输出结果。 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace TestApp
{
    class Program
    {
        static void Main(string[] args)
        {
            //获取dll程序集
            Assembly tmpAss = Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + "Test.dll");

            //获取程序集所有类型
            Type[] tmpTypes = tmpAss.GetTypes();

            foreach (Type tmpType in tmpTypes)
            {
                //获取程序集中的构造函数
                ConstructorInfo[] tmpInfors = tmpType.GetConstructors();
                foreach (ConstructorInfo tmpInfo in tmpInfors)
                {
                    //获取构造函数的参数
                    ParameterInfo[] tmpParamInfos = tmpInfo.GetParameters();
                    object[] tmpParams = new object[tmpParamInfos.Length];
                    for (int i = 0; i < tmpParamInfos.Length; i++)
                    {
                        //判断参数类型并赋值
                        tmpParams[i] = tmpAss.CreateInstance(tmpParamInfos[i].ParameterType.FullName);
                        if (tmpParamInfos[i].ParameterType.FullName == "System.String")
                        {
                            tmpParams[i] = "Clint";
                        }
                    }
                    object tmpObj = tmpInfo.Invoke(tmpParams);
                    Console.WriteLine(tmpObj);

                    //获取程序集中的方法
                    foreach (MethodInfo tmpMethod in tmpType.GetMethods())
                    {
                        tmpParamInfos = tmpMethod.GetParameters();
                        tmpParams = new object[tmpParamInfos.Length];
                        for (int i = 0; i < tmpParamInfos.Length; i++)
                        {
                            //判断参数类型并赋值
                            tmpParams[i] = tmpAss.CreateInstance(tmpParamInfos[i].ParameterType.FullName);
                            if (tmpParamInfos[i].ParameterType.FullName == "System.String")
                            {
                                tmpParams[i] = "Clint Su";
                            }
                            if (tmpParamInfos[i].ParameterType.FullName == "System.Int32")
                            {
                                tmpParams[i] = 27;
                            }

                        }
                        tmpMethod.Invoke(tmpObj, tmpParams);
                    }
                    Console.WriteLine(tmpObj);

                }

                Console.ReadLine();
            }
        }
    }
}

输出结果：

Name:Clint,Age:0
Name:Clint Su,Age:27