cSharp:use Activator.CreateInstance with an Interface?

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///<summary> ///数据访问工厂 ///生成時間2015-2-13 10:54:34 ///塗聚文(Geovin Du) /// (利用工厂模式+反射机制+缓存机制,实现动态创建不同的数据层对象接口) ///</summary> public class AbstractFactory {         protected static string path = ConfigurationManager.AppSettings["WebDAL"]; //"DAL";//生成的DLL文件名       /// <summary>     /// 数据库类型     /// </summary>     protected static string dalType     {                     get         {             if (path.Contains("AccessDAL"))             {                 //path = "AcessDAL";                                    return "AccessDAL";             }             else if (path=="DAL")             {                // path = "DAL";//生成的DLL文件名                 return "SqlServerDAL";//命名空间名称             }             else if (path.Contains("MySQLDAL"))             {                 return "MySQLDAL";             }             else if (path.Contains("DALSQLite"))             {                 //path = "DALSQLite";                 return "SQLiteDAL";             }             else if (path.Contains("PostgreSQLDAL"))             {                // path = "DALPostgreSQL";                 return "PostgreSQLDAL";             }             else if (path.Contains("OracleDAL"))             {                 return "OracleDAL";             }             else             {                 //path = "DAL";                 return "SqlServerDAL";             }         }     }       public AbstractFactory()     { }       ///<summary>     ///分页接口     /// </summary>     ///<returns></returns>     public static ISelectPage CreateSelectPage()     {         //ISelectPage page = new SelectPage();         //return page;         string className = "GeovinDu." + dalType + ".SelectPage";         return (ISelectPage)Assembly.Load(path).CreateInstance(className); //命名空间名称GeovinDu.SqlServerDAL         //path = "AcessDAL";//生成的DLL文件名       }       ///<summary>     ///CompanyBranch接口     /// </summary>     ///<returns></returns>     public static ICompanyBranch CreateCompanyBranch(string _databaseprefix, string _sysdatarolefix)     {         //ICompanyBranch iCompanyBranch = new CompanyBranchDAL();         //return iCompanyBranch;         string className = "GeovinDu." + dalType + ".CompanyBranchDAL";//(_databaseprefix, _sysdatarolefix)         return (ICompanyBranch)Assembly.Load(path).CreateInstance(className); //GeovinDu.SqlServerDAL     }       ///<summary>     ///EnterpriseType接口     /// </summary>     ///<returns></returns>     public static IEnterpriseType CreateEnterpriseType(string _databaseprefix, string _sysdatarolefix)     {         //IEnterpriseType iEnterpriseType = new EnterpriseTypeDAL();         //return iEnterpriseType;         string className = "GeovinDu." + dalType + ".EnterpriseTypeDAL";         return (IEnterpriseType)Assembly.Load(path).CreateInstance(className);     }       ///<summary>     ///LoginDiaryList接口     /// </summary>     ///<returns></returns>     public static ILoginDiaryList CreateLoginDiaryList(string _databaseprefix, string _sysdatarolefix)     {         //ILoginDiaryList iLoginDiaryList = new LoginDiaryListDAL();         //return iLoginDiaryList;         string className = "GeovinDu." + dalType + ".LoginDiaryListDAL";//(_databaseprefix, _sysdatarolefix)         return (ILoginDiaryList)Assembly.Load(path).CreateInstance(className);     }       ///<summary>     ///OperatingUser接口     ///https://msdn.microsoft.com/zh-cn/library/ms173128(VS.80).aspx       ///https://stackoverflow.com/questions/2202381/reflection-how-to-invoke-method-with-parameters     /// </summary>     ///<returns></returns>     public static IOperatingUser CreateOperatingUser(string _databaseprefix, string _sysdatarolefix)     {         //IOperatingUser iOperatingUser = new OperatingUserDAL(_databaseprefix, _sysdatarolefix);         //return iOperatingUser;         IOperatingUser iOperatingUser = null;         string className = "GeovinDu." + dalType + ".OperatingUserDAL";//(_databaseprefix, _sysdatarolefix)         //return (IOperatingUser)Assembly.Load(path).CreateInstance(className);           //string className = "GeovinDu.SQLiteDAL.OperatingUserDAL";         //Assembly assembly = Assembly.LoadFrom(@"G:\winxp备份\PayrollPrint4\PayrollPrint\bin\Release\DALSQLite.dll");         // object oo = assembly.CreateInstance(className);  //得到对象命名空间名         // MethodInfo methodinfo = assembly.GetType("GeovinDu.GeovinDu.SQLiteDAL.OperatingUserDAL").GetMethod("OperatingUserDAL");   //得到方法         //Object obj = methodinfo.Invoke(oo, new object[] { _databaseprefix, _sysdatarolefix });         //IOperatingUser iOperatingUser = (IOperatingUser)obj;         object obj = Assembly.Load(path).CreateInstance(className);         Type t2 = obj.GetType();// Type.GetType("GeovinDu.SQLiteDAL.OperatingUserDAL", false, true);         if (t2 != null)         {             iOperatingUser = (OperatingUserDAL)Activator.CreateInstance(t2, new object[] { });          //Assembly.Load(path).CreateInstance(className);  //值為空         }            //iOperatingUser = (IOperatingUser)Activator.CreateInstance(System.Type.GetType(className));             return iOperatingUser;       }       ///<summary>     ///PrintWordDocumentTemplateList接口     /// </summary>     ///<returns></returns>     public static IPrintWordDocumentTemplateList CreatePrintWordDocumentTemplateList(string _databaseprefix, string _sysdatarolefix)     {         //IPrintWordDocumentTemplateList iPrintWordDocumentTemplateList = new PrintWordDocumentTemplateListDAL();         //return iPrintWordDocumentTemplateList;         string className = "GeovinDu." + dalType + ".PrintWordDocumentTemplateListDAL";//(_databaseprefix, _sysdatarolefix)         return (IPrintWordDocumentTemplateList)Assembly.Load(path).CreateInstance(className);     }          /// <summary>     ///     /// </summary>     /// <returns></returns>     public static ISysConfig CreateSysConfig()     {           string className = "GeovinDu." + dalType + ".SysConfigDAL";         return (ISysConfig)Assembly.Load(path).CreateInstance(className);         //databaseprefix = _databaseprefix;         //ISysConfig iSysConfig = new DAL.SysConfigDAL();         //return iSysConfig;     } }

　　

https://github.com/fabriciorissetto/CustomActivator

https://www.codeproject.com/Articles/55710/Reflection-in-NET

https://www.codeproject.com/Articles/14593/A-General-Fast-Method-Invoker

 https://github.com/ekonbenefits/impromptu-interface

 https://www.codeproject.com/Articles/109868/General-DynamicObject-Proxy-and-Fast-Reflection-Pr

https://www.codeproject.com/articles/15089/an-abstract-factory-using-app-config-and-reflectio

 https://www.microsoft.com/net/download/windows

 

　

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/// <summary> /// 无构造函数的用法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="dllname"></param> /// <param name="fullClassName"></param> /// <returns></returns> public static T CreateInstance<T>(string dllname, string fullClassName) {     //string fullClassName = nameSpace + "." + className;     return (T)Assembly.Load(dllname).CreateInstance(fullClassName); } /// <summary> /// 有構造函數的用法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="dllname"></param> /// <param name="fullName"></param> /// <param name="parameters">构造函数的参数</param> /// <returns></returns> public static T CreateInstance<T>(string dllname, string fullName, object[] parameters) {     try     {         //string fullName = nameSpace + "." + className;//命名空间.类型名         object ect = Assembly.Load(dllname).CreateInstance(fullName, true, System.Reflection.BindingFlags.Default | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, parameters, null, null);//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     }     catch     {         //发生异常，返回类型的默认值         return default(T);     } } /// <summary> /// 有構造函數的用法 /// geovindu /// 塗聚文 涂聚文 /// Geovin Du /// </summary> /// <typeparam name="T"></typeparam> /// <param name="fullTypeName"></param> /// <param name="paramArray">构造函数的参数</param> /// <returns></returns> public static T CreateInstance<T>(string fullTypeName, object[] parameters) {     return (T)Activator.CreateInstance(Type.GetType(fullTypeName), parameters); } /// <summary> /// 有構造函數的用法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="dllname"></param> /// <param name="fullTypeName"></param> /// <param name="paramArray"></param> /// <returns></returns> public static T CreateInstanceActivator<T>(string dllname, string fullTypeName, object[] paramArray) {     Assembly tempAssembly = Assembly.Load(dllname);     Type typeofControl = tempAssembly.GetType(fullTypeName);     return (T)Activator.CreateInstance(typeofControl, paramArray); } /// <summary> /// 有構造函數的用法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="fullTypeName"></param> /// <param name="paramArray"></param> /// <returns></returns> //public static T CreateInstance<T>(string fullTypeName, params object[] paramArray) //{ //    return (T)Activator.CreateInstance(Type.GetType(fullTypeName), args: paramArray); //} /// <summary> /// 无构造函数的用法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="fullTypeName"></param> /// <returns></returns> public static T CreateInstance<T>(string fullTypeName) {     return (T)Activator.CreateInstance(Type.GetType(fullTypeName)); }

　　

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string dir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);           string pdll = dir + @"\DALSQLite.dll";           Type type = Type.GetType("System.String");           object obj = Assembly.Load("DALSQLite").CreateInstance(className, true, System.Reflection.BindingFlags.Default | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, parameter, null, null);//className           //构造函数                       Type t2 = obj.GetType();           object oodu = Activator.CreateInstance(t2,parameter);               //t2.GetConstructors           if (oodu != null)           {               string du = oodu.ToString();           }             string[] str = { _databaseprefix, _sysdatarolefix };             //Type type = Type.GetType("System.String");           Assembly pluginAssembly = Assembly.LoadFrom(pdll);           Type dynclasstype = pluginAssembly.GetType(className);             Type[] pt = new Type[2];           pt[0] = typeof(string);// typeof(string);           pt[1] = typeof(string);//typeof(string);           //object dynobj = Activator.CreateInstance(dynclasstype);//有構造函數不可以用           object dynobj = Activator.CreateInstance(dynclasstype,parameter);           if (dynobj != null)           {               dynobj.ToString();               ConstructorInfo[] cinfos = dynclasstype.GetConstructors();// (pt);               ConstructorInfo cinfo = cinfos[0];// dynclasstype.GetConstructor(pt);                               if (cinfo != null)               {                   string na = cinfo.Name;                   ParameterInfo[] psci = cinfo.GetParameters();                   foreach (ParameterInfo pici in psci)   //遍历并打印所该构造函数的所有参数                   {                      string nci=pici.ParameterType.ToString() + " :" + pici.Name + ",";                   }                 }           }             Type classType = pluginAssembly.GetType(className);           StringBuilder g = new StringBuilder();           ConstructorInfo[] ci = t2.GetConstructors();    //获取类的所有构造函数           foreach (ConstructorInfo c in ci) //遍历每一个构造函数           {               c.ToString();               ParameterInfo[] ps = c.GetParameters();    //取出每个构造函数的所有参数               foreach (ParameterInfo pi in ps)   //遍历并打印所该构造函数的所有参数               {                   g.Append(pi.ParameterType.ToString() + " :" + pi.Name + ",");               }                           }