global.asax进行配制

最新推荐文章于 2024-03-20 23:44:19 发布

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最新推荐文章于 2024-03-20 23:44:19 发布

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分类专栏： asp.net相关知识文章标签： application authentication object exception vb.net session

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本文详细介绍了ASP.NET中Global.asax文件的作用及其事件处理方法。通过VB.NET代码示例展示了如何利用Application_Start、Session_Start、Application_AuthenticateRequest及Application_Error等事件来初始化应用配置、设置会话变量、实现表单认证以及处理全局错误。

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这个例子只是很简单地使用了一些Global.asax 文件中的事件；重要的是要意识到这些事件是与整个应用程序相关的。这样，所有放在其中的方法都会通过应用程序的代码被提供，这就是它的名字为Global 的原因。

这里是前面的例子相应的 VB.NET 代码：

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) Application("Title") = "Builder.com Sample" End Sub Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) Session("startValue") = 0 End Sub Sub Application_AuthenticateRequest(ByVal sender As Object, ByVal e As EventArgs) ' Extract the forms authentication cookie Dim cookieName As String cookieName = FormsAuthentication.FormsCookieName Dim authCookie As HttpCookie authCookie = Context.Request.Cookies(cookieName) If (authCookie Is Nothing) Then ' There is no authentication cookie. Return End If Dim authTicket As FormsAuthenticationTicket authTicket = Nothing Try authTicket = FormsAuthentication.Decrypt(authCookie.Value) Catch ex As Exception ' Log exception details (omitted for simplicity) Return End Try Dim roles(2) As String roles(0) = "One" roles(1) = "Two" Dim id As FormsIdentity id = New FormsIdentity(authTicket) Dim principal As GenericPrincipal principal = New GenericPrincipal(id, roles) ' Attach the new principal object to the current HttpContext object Context.User = principal End Sub Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs) Response.Write("Error encountered.") End Sub