創(chuàng)建對(duì)象一般有3中方式：1.構(gòu)造器創(chuàng)建。2.靜態(tài)工廠創(chuàng)建。3.實(shí)例工廠創(chuàng)建。

多數(shù)情況下，容器會(huì)根據(jù)對(duì)象定義中的type屬性值去直接調(diào)用響應(yīng)類型的某個(gè)構(gòu)造器。另外，容器也可以調(diào)用工廠方法來創(chuàng)建對(duì)象，這時(shí)type屬性的值就應(yīng)該是包含工廠方法的類型（注：而不是要?jiǎng)?chuàng)建的類型，但通過該對(duì)象定義的名稱獲取的是由工廠方法所創(chuàng)建的對(duì)象）。工廠方法的產(chǎn)生對(duì)象可以是工廠方法所在的類型，也可以是其他類型（注：很多情況下工廠方法位于單獨(dú)的類型中），這無關(guān)緊要。

一、通過構(gòu)造器創(chuàng)建對(duì)象、

通過構(gòu)造器創(chuàng)建隊(duì)形需要滿足這幾個(gè)條件：1.指明對(duì)象類型type=”類全名，程序集名”

2.有一個(gè)無參的構(gòu)造函數(shù)或者默認(rèn)構(gòu)造函數(shù)。

  <!--構(gòu)造器-->
  <object id="PersonDao" type="Dao.PersonDao,　Dao">
  </object>

        /// <summary>
        /// 構(gòu)造器創(chuàng)建
        /// </summary>
        static void CreateByConstructor()
        {
            string[] XMLFiles = new string[]
            {
                "assembly://CreateObjects/CreateObjects/Objects.xml"
            };
            IApplicationContext context = new XmlApplicationContext(XMLFiles);
            IObjectFactory factory = (IObjectFactory)context;
            Console.Write(factory.GetObject("PersonDao").ToString());
        }

嵌套類型對(duì)象的創(chuàng)建需要“+”號(hào)來連接被嵌套的類型。如果在PersonDao中嵌套了類型Person

  <!--嵌套類型-->
  <object id="Person" type="Dao.PersonDao+Person,　Dao">
  </object>

        /// <summary>
        /// 嵌套類型創(chuàng)建
        /// </summary>
        static void CreateNested()
        {
            string[] XMLFiles = new string[]
            {
                "assembly://CreateObjects/CreateObjects/Objects.xml"
            };
            IApplicationContext context = new XmlApplicationContext(XMLFiles);
            IObjectFactory factory = (IObjectFactory)context;
            Console.Write(factory.GetObject("Person").ToString());
        }

二、靜態(tài)工廠創(chuàng)建

使用靜態(tài)工廠創(chuàng)建對(duì)象需要配置factory-mothod屬性

  <!--靜態(tài)工廠-->
  <object id="StaticObjectsFactory" type="DaoFactory.DataAccess,　DaoFactory" factory-method="CreatePersonDao">
  </object>

        /// <summary>
        /// 靜態(tài)工廠創(chuàng)建
        /// </summary>
        static void CreateByStaticFactory()
        {
            string[] XMLFiles = new string[]
            {
                "assembly://CreateObjects/CreateObjects/Objects.xml"
            };
            IApplicationContext context = new XmlApplicationContext(XMLFiles);
            IObjectFactory factory = (IObjectFactory)context;
            Console.Write(factory.GetObject("StaticObjectsFactory").ToString());
        }

三、使用實(shí)例工廠創(chuàng)建對(duì)象

使用實(shí)例工廠創(chuàng)建隊(duì)形需要先定義一個(gè)工廠，然后設(shè)factory-object和factory-method屬性，且滿足實(shí)例工廠方法所在的對(duì)象必須也要配置在同一容器（或父容器）中 和 對(duì)象定義就不能包含type屬性

  <!--實(shí)例工廠-->
  <!--工廠-->
  <object id="instanceObjectsFactory" type="DaoFactory.DataAccess,　DaoFactory">
  </object>
  <!--創(chuàng)建的對(duì)象-->
  <object id="instancePersonDao" factory-method="CreateInstance" factory-object="instanceObjectsFactory"> 
</object>

        /// <summary>
        /// 實(shí)例工廠創(chuàng)建
        /// </summary>
        static void CreateByInstanceFactory()
        {
            string[] xmlFiles = new string[]
            {
                "assembly://CreateObjects/CreateObjects/Objects.xml"
            };
            IApplicationContext context = new XmlApplicationContext(xmlFiles);
            IObjectFactory factory = (IObjectFactory)context;
            Console.WriteLine(factory.GetObject("instancePersonDao").ToString());
        }

四、泛型類型的創(chuàng)建

泛型類型的創(chuàng)建比較類型于以上幾種創(chuàng)建，可以有通過構(gòu)造器創(chuàng)建，還可以通過靜態(tài)或者工廠創(chuàng)建，但是設(shè)置type屬性的時(shí)候要注意：左尖括號(hào)<要替換成字符串”<”,因?yàn)樵赬ML中左尖括號(hào)會(huì)被認(rèn)為是小于號(hào)。

  <!--創(chuàng)建泛型-->
  <object id="genericClass" type="Dao.GenericClass<int>, Dao" >
  </object>    

        /// <summary>
        /// 泛型創(chuàng)建
        /// </summary>
        static void CreateByGenericClass()
        {
            string[] xmlFiles = new string[]
            {
                "assembly://CreateObjects/CreateObjects/Objects.xml"
            };
            IApplicationContext context = new XmlApplicationContext(xmlFiles);
            IObjectFactory factory = (IObjectFactory)context;
            Console.WriteLine(factory.GetObject("genericClass").ToString());
        }

代碼連接：https://download.csdn.net/download/wjgwrr/10429544