C# 反射应用(加载、解析--获取构造、方法、属性)

注：以下代码仅供参考使用，实际使用过程，应根据实际场景--进行提取重构，提升复用效率......

简单理解，反射应用于加载动态库DLL，解析其内部实现.......

示例如下所示：注，该代码基于.NET 5 

  运行效果如下所示：

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using System; using System.Reflection; using TestDLL;   namespace Reflection {     /// <summary>     /// ---------------------C# 反射应用------------------     /// 加载、调用（TestDLL.dll为例--应和启动程序同目录）、实例化...     /// </summary>     class Program     {         static void Main(string[] args)         {             Console.WriteLine("-----------------加载 DLL------------");             Assembly assembly = LoadDLL(@"TestDLL.dll"); //加载 DLL             //Type type = assembly.GetType("TestDLL.ReflectionTest");             Type type = GetTypeByNamespace(assembly, "TestDLL.ReflectionTest");               Console.WriteLine("-----------------获取指定动态库的所有实例------------");             GetTypes(assembly);               Console.WriteLine("-----------------构造调用------------");             object obj = GetStructMethod(type, "反射反射来一个");             //GetStructAllMethod(type);//构造调用               Console.WriteLine("-----------------普通方法调用------------");             ReflectionTest show = obj as ReflectionTest;             show.Show1();             //temp.Show3<ReflectionTest>();             //temp.Show4<ReflectionTest>("Show4入参测试");             Console.WriteLine("-----------------私有方法调用------------");             GetPrivateMethod(type, obj, "Show2");               Console.WriteLine("-----------------泛型方法调用------------");             //泛型方法调用             GetMethodByName(type, obj, "Show3");             GetMethodByNameAndParams(type, obj, "Show4", "有参泛型方法调用测试入参");               Console.WriteLine("-----------------泛型类 + 泛型方法------------");             //泛型类 + 泛型方法(一定要给定具体的类型参数) `1表示一个参数             GetGenericMethod(assembly, "TestDLL.GenericClass`1", "GenericMethod");               //设置属性和获取属性             Console.WriteLine("-----------------设置属性和获取属性------------");             GetProperty(assembly, "TestDLL.PropertyClass");               Console.ReadLine();         }           private static void GetProperty(Assembly assembly, string propertyClass)         {             Type type = assembly.GetType(propertyClass);             object obj = Activator.CreateInstance(type);             int index = 0;             foreach (var item in type.GetProperties())             {                 Console.WriteLine("属性名称==" + item.Name);                 index++;                 //测试一把                 if (item.Name.Equals("Id")) item.SetValue(obj, index);                 if (item.Name.Equals("Name")) item.SetValue(obj, "Name" + index);                 if (item.Name.Equals("NickName")) item.SetValue(obj, "NickName" + index);             }         }           private static void GetGenericMethod(Assembly assembly, string genericClass, string methodName)         {             Type type = assembly.GetType(genericClass).MakeGenericType(typeof(string));             object obj = Activator.CreateInstance(type);             var method = type.GetMethod(methodName).MakeGenericMethod(new Type[] { typeof(string) });             method.Invoke(obj, new object[] { });         }           /// <summary>         /// 泛型方法调用--无参         /// </summary>         /// <param name="type">Type type</param>         /// <param name="obj">object obj</param>         /// <param name="methodName">方法名称</param>         private static void GetMethodByNameAndParams(Type type, object obj,             string methodName, string paramStr)         {             //查找指定的方法             var method = type.GetMethod(methodName);             //指定泛型参数类型             var temp = method.MakeGenericMethod(new Type[] { typeof(string) });             temp.Invoke(obj, new object[] { paramStr });         }           /// <summary>         /// 泛型方法调用--无参         /// </summary>         /// <param name="type">Type type</param>         /// <param name="obj">object obj</param>         /// <param name="methodName">方法名称</param>         private static void GetMethodByName(Type type, object obj, string methodName)         {             //查找指定的方法             var method = type.GetMethod(methodName);             //指定泛型参数类型             var temp = method.MakeGenericMethod(new Type[] { typeof(string) });             temp.Invoke(obj, new object[] { });         }           /// <summary>         /// 泛型方法调用         /// </summary>         /// <param name="type">Type type</param>         /// <param name="obj">object obj</param>         /// <param name="methodName">方法名称</param>         private static void GetPrivateMethod(Type type, object obj, string methodName)         {             var method = type.GetMethod(methodName, BindingFlags.Instance | BindingFlags.NonPublic);             method.Invoke(obj, new object[] { });         }           /// <summary>         /// 获取指定动态库的所有实例         /// </summary>         /// <param name="assembly">Assembly assembly</param>         /// <returns></returns>         private static Type[] GetTypes(Assembly assembly)         {             var temps = assembly.GetTypes();             foreach (var item in temps)             {                 Console.WriteLine("name==" + item.Name);             }             return temps;         }           /// <summary>         /// 构造调--实例化         /// </summary>         /// <param name="type"></param>         private static void GetStructAllMethod(Type type)         {             foreach (var ctor in type.GetConstructors(BindingFlags.Instance | BindingFlags.NonPublic                 | BindingFlags.Public))             {                 Console.WriteLine("构造方法如下：" + ctor.Name);                 foreach (var param in ctor.GetParameters())                 {                     Console.WriteLine("构造方法的参数：" + param.ParameterType);                 }             }         }           /// <summary>         /// 构造调--实例化         /// </summary>         /// <param name="type"></param>         private static object GetStructMethod(Type type, string paramStr)         {             //动态获取实例类型--var/object类型(无参构造调用)             //var temp = Activator.CreateInstance(type);               //动态获取实例类型--var/object类型(有参构造调用)             var temp = Activator.CreateInstance(type, new object[] { paramStr });               //私有构造方法调用（）             var privateStruct = Activator.CreateInstance(type, true);               return privateStruct;         }           /// <summary>         /// 通过反射获取指定类型(TestDLL.dll为例)         /// </summary>         /// <param name="assembly">Assembly assembly</param>         /// <param name="namespaceAll">Assembly assembly</param>         /// <returns></returns>         private static Type GetTypeByNamespace(Assembly assembly, string namespaceAll)         {             return assembly.GetType(namespaceAll);         }           /// <summary>         /// 加载 DLL         /// </summary>         /// <returns></returns>         private static Assembly LoadDLL(string dllName)         {             //建议使用方式             Assembly assembly = Assembly.LoadFrom(dllName);//@"TestDLL.dll"               //加载DLL文件  加载文件需在项目启动位置             //Assembly assembly1 = Assembly.Load("TestDLL");               //不建议使用方式             //Assembly assembly3 = Assembly             //    .LoadFrom(@"D:\常用dll整理包\C# 反射应用\Reflection\bin\Debug\net5.0\TestDLL.dll");             //Assembly assembly4 = Assembly             //    .LoadFile(@"D:\常用dll整理包\C# 反射应用\Reflection\bin\Debug\net5.0\TestDLL.dll");             return assembly;         }     } }   using System;   namespace TestDLL {     public class GenericClass<T>     {         public void GenericMethod<TType>()         {             Console.WriteLine("GenericMethod方法调用");         }     } }   namespace TestDLL {     public class PropertyClass     {         public int Id { get; set; }         public string Name { get; set; }         public string NickName { get; set; }     } }   using System;   namespace TestDLL {     public class ReflectionTest     {         public ReflectionTest()         {             Console.WriteLine("私有调用无参构造方法成功");         }           //public ReflectionTest()         //{         //    Console.WriteLine("调用无参构造方法成功");         //}           public ReflectionTest(string paramValue)         {             Console.WriteLine("调用有参构造方法成功，参数=" + paramValue);         }           public void Show1()         {             Console.WriteLine("Show1普通方法调用", this.GetType());         }           private void Show2()         {             Console.WriteLine("Show2私有方法调用", this.GetType());         }         public void Show3<T>()         {             Console.WriteLine("Show3泛型方法调用", this.GetType());         }           public void Show4<T>(string name)         {             Console.WriteLine("Show4泛型方法调用,参数是==" + name, this.GetType());         }     } }   using System;   namespace TestDLL {     public class ReflectionTest2     {         public ReflectionTest2()         {             Console.WriteLine("ReflectionTest2调用无参构造方法成功");         }           public ReflectionTest2(string paramValue)         {             Console.WriteLine("ReflectionTest2调用有参构造方法成功，参数=" + paramValue);         }     } }