C#通过Assembly反射创建对象的实例

Love The Way You Lie 2023-02-14 13:07 15阅读 0赞

我感觉下面这个反射帮助类不错,贴出来给大家共享一下:

/// <summary>
        /// 反射帮助类
        /// </summary>
        public static class ReflectionHelper
        {
            /// <summary>
            /// 创建对象实例
            /// </summary>
            /// <typeparam name="T"></typeparam>
            /// <param name="fullName">命名空间.类型名</param>
            /// <param name="assemblyName">程序集</param>
            /// <returns></returns>
            public static T CreateInstance<T>(string fullName, string assemblyName)
            {
                string path = fullName + "," + assemblyName;//命名空间.类型名,程序集
                Type o = Type.GetType(path);//加载类型
                object obj = Activator.CreateInstance(o, true);//根据类型创建实例
                return (T)obj;//类型转换并返回
            }
    
            /// <summary>
            /// 创建对象实例
            /// </summary>
            /// <typeparam name="T">要创建对象的类型</typeparam>
            /// <param name="assemblyName">类型所在程序集名称</param>
            /// <param name="nameSpace">类型所在命名空间</param>
            /// <param name="className">类型名</param>
            /// <returns></returns>
            public static T CreateInstance<T>(string assemblyName, string nameSpace,         string className)
            {
                try
                {
                    string fullName = nameSpace + "." + className;//命名空间.类型名
                    //此为第一种写法
                    object ect = Assembly.Load(assemblyName).CreateInstance(fullName);//加载程序集，创建程序集里面的 命名空间.类型名 实例
                    return (T)ect;//类型转换并返回
                    //下面是第二种写法
                    //string path = fullName + "," + assemblyName;//命名空间.类型名,程序集
                    //Type o = Type.GetType(path);//加载类型
                    //object obj = Activator.CreateInstance(o, true);//根据类型创建实例
                    //return (T)obj;//类型转换并返回
                }
                catch
                {
                    //发生异常，返回类型的默认值
                    return default(T);
                }
            }
        }

调用方法:

static void Main(string[] args)
            {
                Assembly assembly = Assembly.GetExecutingAssembly(); // 获取当前程序集
                string aaa = assembly.FullName;
                Type t = typeof(test);
                string className = t.Name;
                string nameSpaceName = t.Namespace;
                string fullName = t.FullName;
                //第一种
                test tt = ReflectionHelper.CreateInstance<test>(fullName, aaa);
                tt.printTest();
    
                //第二种
                tt = ReflectionHelper.CreateInstance<test>(aaa, nameSpaceName, className);
                tt.printTest();
    
                Console.ReadKey();
            }