分享一段C#反射代码-[Type是反射的入口]--[查看类型信息]--[动态生成对象]
反射是一个非常强大的机制。利用它可以动态的生成一个对象。还可以查看作用到类型上的Attribute。
当然了,利用反射在效率上会有些影响,但没有反射许多地方真的不容易实现,甚至实现不了,所以说要辨证的去看待这个问题。
下面贴一段非常简单的代码,查看了类型,查看了类型中的成员信息。
//程序集-包含->模块-包含->类型-包含->元素
代码如下:
using System; using System.Reflection; namespace zuo_TestReflectionProject{ #region "程序入口" public class Program{ static void Main(){ People pa = new People("鸿蒙","道人",3600); Console.WriteLine(pa); Console.WriteLine(new string('-',40)); Type tx = pa.GetType(); //反射入口,获取类型 Console.WriteLine("类型名:{0}\n",tx.Name); Console.WriteLine("全名称:{0}\n",tx.FullName); Console.WriteLine(new string('-',40)); object[] what = tx.GetCustomAttributes(typeof(SoftInfoAttribute),false); //将作用在这个类型上的特性提取出来 foreach(SoftInfoAttribute si in what){ //遍历特性项 Console.WriteLine(si.InfoType); Console.WriteLine(si.Author); Console.WriteLine(si.Dm); if(!String.IsNullOrEmpty(si.Memo)){ Console.WriteLine(si.Memo); } Console.WriteLine(new string('-',40)); } MethodInfo[] mis = tx.GetMethods(
BindingFlags.Instance
|BindingFlags.Static
|BindingFlags.Public
|BindingFlags.NonPublic
|BindingFlags.DeclaredOnly); //将其所有的方法都列出来 Console.WriteLine("列出其所有的方法:\n"); foreach(MethodInfo mi in mis){ Console.WriteLine("方法名:{1} {2} {0}();",mi.Name,mi.MemberType,mi.ReturnType);
//查看方法上是否有被作用的特性 object[] metAttribute = mi.GetCustomAttributes(typeof(SoftInfoAttribute),false); foreach(SoftInfoAttribute ss in metAttribute){ //列出作用在方法上的特性项 Console.WriteLine("\t{0} {1} {2} {3}",ss.InfoType,ss.Author,ss.Dm,ss.Memo); } } Console.WriteLine("\n\n"); Assembly currentAssembly = Assembly.GetExecutingAssembly(); //载入程序集,当前程序集 Console.WriteLine("当前程序集的名称:{0}",currentAssembly.FullName); Console.WriteLine("\n当前程序集的模块:"); Module[] MyModules = currentAssembly.GetModules(); //获取模块 foreach(Module me in MyModules){ Console.WriteLine("模块名:{0}",me.Name); } //程序集-包含->模块-包含->类型-包含->元素 Console.WriteLine("\n当前程序集的类型:\n"); Type[] AssTypes = currentAssembly.GetTypes(); //获取所有的类 foreach(Type sm in AssTypes){ Console.WriteLine("类型名:{0}",sm.Name); Console.WriteLine("\n\t类型下的所有成员:"); //获取所有的类成员 MemberInfo[] mems = sm.GetMembers(
BindingFlags.Instance
|BindingFlags.Static
|BindingFlags.Public
|BindingFlags.NonPublic
|BindingFlags.DeclaredOnly); foreach(MemberInfo mem in mems){ Console.WriteLine("\t{0} {1}",mem.MemberType,mem); } } Console.WriteLine("\n\n实例化Test类"); object[] parameters = new object[]{"反射创建的Test类对象……"}; object priobj = currentAssembly.CreateInstance("zuo_TestReflectionProject.Test",
true,
BindingFlags.Default,
null,
parameters,
null,
null); //调用Test类中的方法 Type tt = typeof(Test); tt.InvokeMember("show",BindingFlags.InvokeMethod,null,priobj,null); //调用方法 } } #endregion #region "应用程序区" public class Test{ //创建一个带有私有构造函数的类 private string tname; public Test(string t){ this.tname = t; Console.WriteLine("是谁从沉睡中唤醒了我?"); } public void show(){ Console.WriteLine(this.tname); } } [SoftInfo("毁灭者","Ancore","3000-01-01",Memo="末日来临,万物皆灭!")] [SoftInfo("修改人","Rich","2012-01-01",Memo="改进算法")] [SoftInfo("创造人","左安坤","2011-09-27")] public class People { private string firstName; private string lastName; private int age; private string info; public People():this(String.Empty,String.Empty,0){} public People(string f,string l,int a){ this.firstName = f; this.lastName = l; this.age = a; } public string FirstName{ get{ return this.firstName; } } public string LastName{ get{ return this.lastName; } } public int Age{ get{ return this.age; } } public string Info{ get{ return this.info; } set{ this.info = value; } } [SoftInfo("信息发送","沟通","2011-09-27",Memo="科技发展迅猛时期!")] public void SendMessage(People pp,string s){ pp.Info = s; Console.WriteLine("信息发送成功!"); } public override string ToString() { return String.Format("姓:{0} 名:{1} 年龄:{2}",this.firstName,this.lastName,this.age); } } #endregion #region "特性区" [AttributeUsage(AttributeTargets.Class|AttributeTargets.Method,AllowMultiple=true)] public class SoftInfoAttribute:Attribute { private string infoType; //类型 private string author; //作者 private DateTime dm; //日期 private string memo; //备注 public SoftInfoAttribute(string it,string au,string date){ this.infoType = it; this.author = au; this.dm = Convert.ToDateTime(date); } public string InfoType{ get{ return this.infoType; } } public string Author{ get{ return this.author; } } public DateTime Dm{ get{ return this.dm; } } public string Memo{ get{ return this.memo; } set{ this.memo = value; } } } #endregion }