本文介绍了公共语言运行时（CLR）如何通过不同的宿主来启动各种类型的应用程序，包括Web服务器应用程序、具有丰富Windows用户界面的应用程序等。文中详细列举了ASP.NET、Microsoft Internet Explorer及Shell可执行文件作为CLR宿主的例子，并提到了Microsoft提供的API用于编写自定义的运行时宿主。
Runtime Hosts
The common language runtime has been designed to support a variety of different types of applications, from Web server applications to applications with a traditional rich Windows user interface. Each type of application requires a runtime host to start it. The runtime host loads the runtime into a process, creates the application domains within the process, and loads user code into the application domains.
The .NET Framework ships with a number of different runtime hosts, including the hosts listed in the following table.
| Runtime Host | Description |
|---|---|
| ASP.NET | Loads the runtime into the process that is to handle the Web request. ASP.NET also creates an application domain for each Web application that will run on a Web server. |
| Microsoft Internet Explorer | Creates application domains in which to run managed controls. The .NET Framework supports the download and execution of browser-based controls. The runtime interfaces with the extensibility mechanism of Microsoft Internet Explorer through a mime filter to create application domains in which to run the managed controls. By default, one application domain is created for each Web site. |
| Shell executables | Invokes runtime hosting code to transfer control to the runtime each time an executable is launched from the shell. |
Microsoft provides a set of APIs for writing your own runtime hosts.
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