激活剂以及我们如何使用它 [英] activator and how we can use it

问题描述

激活类的确切用途是什么？

what is the exact use of activator class???

 Type ClassType = Type.GetType(ClassName + ", TMS.API, Version=1.0.0.0, Culture=neutral,  Custom=null");
            try
            {
                // Open connection
                OpenConnection();
                // Create the command
                //Execute the SP and return Reader
                dataReaderToFill = ExecuteReaderForXML(spName, baseObject.GetXML());
                int ColumnLength = dataReaderToFill.FieldCount;
                while (dataReaderToFill.Read())
                {
                    Object ClassObject = Activator.CreateInstance(ClassType);

...

推荐答案

Quote：

包含在本地或远程创建对象类型的方法，或获取对现有远程对象的引用。

Contains methods to create types of objects locally or remotely, or obtain references to existing remote objects.

System.Activator [ ^ ]



在上面的例子中，它是用于根据类的类型创建类。类的类型是在第一行中动态创建的。

System.Activator[^]

In the case above, its being used to create a class based on the type of the class. The type of the class is created dynamically in the first line.

Activator是.Net中内置的反射内容的一部分，因此适用于动态实例化类。 />


如果您使用的是工厂模式，Activator是您最好的朋友。



我经常使用它进程处理程序工厂（不要将它与HTTP处理程序混淆，它们是不同的）。我构建了一个抽象基类和一些使用该基类的进程，调用它的抽象方法来完成某些事情。然后我将子类的完全限定类型名称放入数据库或其他配置中，并从中进行实例化。



通常情况如下：

Activator is part of the reflection stuff built into .Net, and as such, is good for dynamically instantiating a class.

If you're using the factory pattern, Activator is your best friend.

I frequently use it for process-handler factories (don't confuse this with HTTP handlers, they're different). I build an abstract base class and some processes that use that base class, calling its abstract methods to get something done. Then I put the fully-qualified type name of the child classes into a database or other configuration, and instantiate from that.

Typically it goes something like this:

// do something to get type name here, for now, just pretend it's stored in childClassName
Type t = Type.GetType(childClassName);
FooBaseClass fbc = (FooBaseClass)Activator.CreateInstance(t);
// fbc is ready to use as an instance of a child class of FooBaseClass

这是配置驱动工厂的核心。

That's the core of a configuration-driven factory.

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