概念问题 Application_BeginRequest 中Context.User.Identity.Name

2003-04-29 11:00:02 227 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

ASP.NET请求生命周期的物理执行路径解析 ASP.NET请求生命周期并非孤立运行的托管流程，而是IIS与CLR深度协同的结果。其核心原理在于IIS通过经典模式或集成模式将HTTP请求委托给CLR宿主（w3wp.exe），再由HttpModule/HttpHandler管道逐级处理；这一机制直接决定了Session状态管理、线程模型行为及错误传播路径的技术价值。在高并发、混合部署与老旧系统迁移等真实场景中，理解IIS托管模式差异、CLR AppDomain卸载时机以及HttpHandler的标记接口（如IRequiresSessionState）至关阅读详情

Line 26: void Application_BeginRequest(Object sender, EventArgs e) {
Line 27: Response.Write("User.Identity.Name");
Line 28: Response.Write(Context.User.Identity.Name);
Line 29: Response.End

错误为Line 28
Object reference not set to an instance of an object.

Context是什么冬冬?

...全文

ASP.NET中HttpContext.Current的5大高危场景与解耦方案 HttpContext.Current是ASP.NET中用于访问当前HTTP请求上下文的核心静态入口，其本质是线程静态（ThreadStatic）单例，生命周期严格绑定IIS工作线程的单次请求执行栈。由于它并非真正‘全局’或‘线程安全’，在async/await、后台任务、SignalR、Global.asax事件及单元测试等场景下极易出现null引用、上下文错乱与并发异常。理解其底层基于IIS经典管道的时序依赖和AsyncLocal与ThreadStatic的关键差异，是规避隐式耦合的前提。本文聚焦工程落阅读详情

hardVB

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切换为时间正序

chinchy 2003-05-10

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hardVB 2003-04-29

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哪位师兄帮帮忙看看？

hardVB 2003-04-29

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这是代码，请看看Context哪里初始化?

<%@ Import Namespace="ASPNetPortal" %>
<%@ Import Namespace="System.Security" %>
<%@ Import Namespace="System.Security.Principal" %>
<%@ Import Namespace="System.Data.SqlClient" %>

<script language="C#" runat="server">

//*********************************************************************
//
// Application_BeginRequest Event
//
// The Application_BeginRequest method is an ASP.NET event that executes
// on each web request into the portal application. The below method
// obtains the current tabIndex and TabId from the querystring of the
// request -- and then obtains the configuration necessary to process
// and render the request.
//
// This portal configuration is stored within the application's "Context"
// object -- which is available to all pages, controls and components
// during the processing of a single request.
//
//*********************************************************************

void Application_BeginRequest(Object sender, EventArgs e) {

int tabIndex = 0;
int tabId = 0;

// Get TabIndex from querystring

if (Request.Params["tabindex"] != null) {
tabIndex = Int32.Parse(Request.Params["tabindex"]);
}

// Get TabID from querystring

if (Request.Params["tabid"] != null) {
tabId = Int32.Parse(Request.Params["tabid"]);
}

Context.Items.Add("PortalSettings", new PortalSettings(tabIndex, tabId));
}

//*********************************************************************
//
// Application_AuthenticateRequest Event
//
// If the client is authenticated with the application, then determine
// which security roles he/she belongs to and replace the "User" intrinsic
// with a custom IPrincipal security object that permits "User.IsInRole"
// role checks within the application
//
// Roles are cached in the browser in an in-memory encrypted cookie. If the
// cookie doesn't exist yet for this session, create it.
//
//*********************************************************************

void Application_AuthenticateRequest(Object sender, EventArgs e) {

if (Request.IsAuthenticated == true) {

String[] roles;

// Create the roles cookie if it doesn't exist yet for this session.
if ((Request.Cookies["portalroles"] == null) || (Request.Cookies["portalroles"].Value == "")) {

// Get roles from UserRoles table, and add to cookie
UsersDB user = new UsersDB();
roles = user.GetRoles(User.Identity.Name);
Response.Write("User.Identity.Name:");
Response.Write(User.Identity.Name);
Response.End();
// Create a string to persist the roles
String roleStr = "";
foreach (String role in roles) {
roleStr += role;
roleStr += ";";
}

// Create a cookie authentication ticket.
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
1, // version
Context.User.Identity.Name, // user name
DateTime.Now, // issue time
DateTime.Now.AddHours(1), // expires every hour
false, // don't persist cookie
roleStr // roles
);

// Encrypt the ticket
String cookieStr = FormsAuthentication.Encrypt(ticket);

// Send the cookie to the client
Response.Cookies["portalroles"].Value = cookieStr;
Response.Cookies["portalroles"].Path = "/";
Response.Cookies["portalroles"].Expires = DateTime.Now.AddMinutes(1);
}
else {

// Get roles from roles cookie
FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(Context.Request.Cookies["portalroles"].Value);

//convert the string representation of the role data into a string array
ArrayList userRoles = new ArrayList();

foreach (String role in ticket.UserData.Split( new char[] {';'} )) {
userRoles.Add(role);
}

roles = (String[]) userRoles.ToArray(typeof(String));
}

// Add our own custom principal to the request containing the roles in the auth ticket
Context.User = new GenericPrincipal(Context.User.Identity, roles);
}
}

</script>

hardVB 2003-04-29

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在哪里初始化?

hardVB 2003-04-29

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如何查看Context 的ClassName

timmy3310 2003-04-29

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Context是请求的上下文

你在这里使用Context属性是不行的，这时候Context属性还没有初始化

hardVB 2003-04-29

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补充:以上在global.asax

概念问题 Application_BeginRequest 中Context.User.Identity.Name

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