1、来定义一个接口

    public interface ICustom
    {
        string Get();
    }

2、创建接口的两个实现CustomA和CustomB

    public class CustomA : ICustom
    {
        public string SendTimeout { get; set; }
        public string Address { get; set; }
        public CustomA(string sendTimeout, string address)
        {
            this.SendTimeout = sendTimeout;
            this.Address = address;
        }
        public string Get()
        {
            return string.Concat("CustomA ",SendTimeout," ", Address);
        }
    }
    public class CustomB : ICustom
    {
        public string SendTimeout { get; set; }
        public string Address { get; set; }
        public CustomB(string sendTimeout, string address)
        {
            this.SendTimeout = sendTimeout;
            this.Address = address;
        }
        public string Get()
        {
            return string.Concat("CustomB ", SendTimeout, " ", Address);
        }
    }

注意:实现中需要实现一个带两个参数的构造函数,我们会在动态调用中传入这两个参数

3、 应用Activator.CreateInstance动态调用指定的ICustom的实现

            ICustom iCustom = null;
            Type type = Type.GetType("CSDN.Profile.Statistic.WebTest.CustomA,CSDN.Profile.Statistic.WebTest");
            if (type != null)
            {
                iCustom = (ICustom)Activator.CreateInstance(type, new object[] { "00:00:03", "net.pipe://localhost/StatisticProvider" });
            }


            string str = iCustom.Get();
            Response.Output.Write(str);

返回的结果是CustomA 00:00:03 net.pipe://localhost/StatisticProvider

显示已经成功通过配置type来动态构建了一个相对应的接口了。

+++++++++++++++++++++++

C#中Activator.CreateInstance()方法用法介绍

Activator 类

包含特定的方法,用以在本地或从远程创建对象类型,或获取对现有远程对象的引用。

C#在类工厂中动态创建类的实例,所使用的方法为:

1. Activator.CreateInstance (Type)

2. Activator.CreateInstance (Type, Object[])

两种方法区别仅为:创建无参数的构造方法和创建有参数的构造函数。

//Activator.CreateInstance(Type)
object result = null;
Type typeofControl =null;
typeofControl = Type.GetType(vFullClassName);
result = Activator.CreateInstance(typeofControl);
//Activator.CreateInstance(Type,Object[])
object result = null;
Type typeofControl =null;
typeofControl = Type.GetType(vFullClassName);
result = Activator.CreateInstance(typeofControl, objParam);

但是在动态创建时,可能会动态使用到外部应用的DLL中类的实例,则此时需要进行反编译操作,使用Reflection命名控件下的Assembly类。

//先使用Assembly类载入DLL,再根据类的全路径获取类

object result = null;
Type typeofControl = null;
Assembly tempAssembly;
tempAssembly = Assembly.LoadFrom(vDllName);
typeofControl = tempAssembly.GetType(vFullClassName);
result = Activator.CreateInstance(typeofControl, objParam);