NET中按名称字符串初始化类型

问题描述

我有一个应用程序，该应用程序在启动时会从App.config中读取其设置.该应用程序可以使用其他持久性存储提供程序.目前，我已经实现了两个:Oracle和Dummy(出于测试目的).

I have an application that reads its setting at startup from App.config. The application may use different presistent storage providers. Currently I have two implemented: Oracle and Dummy (for test purposes).

现在在我的Program.cs中，我读取了要使用的存储类型的名称.它可以是OracleStorage或DemoStorage.这些是类型名称，其实现位于单独的dll项目中.

Now in my Program.cs I read the name of the type of storage to use. It may be either OracleStorage or DemoStorage. These are type names, the implementations of which reside in a separate dll project.

现在，考虑到我拥有类型名称，如何实例化一个对象?

Now, how do I instantiate an object given that I have a type name?

所以我可以写:

IStorageProvider storage = new typof(myStorageClassNameReadFromAppConfig);

推荐答案

您可以使用 Activator.CreateInstance 与 Type.GetType :

You can use Activator.CreateInstance combined with Type.GetType:

IStorageProvider storage =
        (IStorageProvider) Activator.CreateInstance(
                             Type.GetType(myStorageClassNameReadFromAppConfig)
                           );

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