如果您放置一个名为app_offline.htm的文件 在一个web应用程序目录的根目录，ASP。NET 2.0+将关闭应用程序并停止对该应用程序的任何新传入请求的正常处理，只显示所有新请求的app_offline.htm文件的内容。

这是在将更改重新部署(或回滚)到生产服务器时显示“站点暂时不可用”通知的最快速和最简单的方法。

另外，正如marxidad所指出的，确保文件中至少有512字节的内容，这样IE6才能正确地呈现它。

If you use web services instead WCF services, you can still use standard .Net membership to enforce authentication and login session behaviour on a set web services similarly to a how you would secure web site with membership forms authentication & without the need for a special session and/or soap headers implementations by simply calling System.Web.Security.FormsAuthentication.SetAuthCookie(userName, false) [after calling Membership.ValidateUser(userName, password) of course] to create cookie in the response as if the user has logged in via a web form. Then you can retrieve this authentication cookie with Response.Cookies[].Value and return it as a string to the user which can be used to authenticate the user in subsequent calls by re-creating the cookie in the Application_BeginRequest by extracting the cookie method call param from the Request.InputStream and re-creating the auth cookie before the membership authenticates the request this way the membership provider gets tricked and will know the request is authenticated and enforce all its rules.

将此cookie返回给用户的示例web方法签名如下: 字符串登录(用户名、密码)

后续web方法调用示例如下: 字符串DoSomething(字符串authcookie，字符串methodParam1,int methodParam2等，等)，你需要提取authcookie(这是从登录方法获得的值)参数从请求。InputStreamis

这也模拟了一个登录会话并调用FormsAuthentication。签出在web方法，如注销(authcookie)将 使用户需要再次登录。

HttpContext.Current will always give you access to the current context's Request/Response/etc., even when you don't have access to the Page's properties (e.g., from a loosely-coupled helper class). You can continue executing code on the same page after redirecting the user to another one by calling Response.Redirect(url, false ) You don't need .ASPX files if all you want is a compiled Page (or any IHttpHandler). Just set the path and HTTP methods to point to the class in the <httpHandlers> element in the web.config file. A Page object can be retrieved from an .ASPX file programmatically by calling PageParser.GetCompiledPageInstance(virtualPath,aspxFileName,Context)

System.Web.VirtualPathUtility

应用程序变量可以与web应用程序一起使用，以便在整个应用程序中进行通信。它在全局中初始化。Asax文件，并在该web应用程序的页面上使用的所有用户独立于他们创建的会话。

在开始一个长时间运行的任务之前，检查客户端是否仍然连接:

if (this.Response.IsClientConnected)
{
  // long-running task
}