7
如果cookie中存在UserName和Password，我想在masterpage的page_load中自动登录我的用户！
所以我写了下面的代码：服务器在发送HTTP头之后无法修改cookie，Fix如何？
protected void Page_Load(object sender, EventArgs e)
{
LoadDataFromCookieIfExistAndLogin();
}
private void LoadDataFromCookieIfExistAndLogin()
{
string Query = Request.Url.Query.ToString();
string[] Ar_Query = new string[2];
string[] splitter = { "%2f" };
Ar_Query = Query.Split(splitter, System.StringSplitOptions.None);
string[] Ar_new_Query = new string[2];
int minLength = Math.Min(Ar_Query.Length, Ar_new_Query.Length);
Array.Copy(Ar_Query, Ar_new_Query, minLength);
if (string.IsNullOrEmpty(Ar_new_Query[1]))
{
Ar_new_Query[1] = string.Empty;
}
if ((Request.QueryString["ReturnURL"] != null) && (Ar_new_Query[1].ToString().ToUpper() == "ADMIN"))
{
Session.Clear();
FormsAuthentication.SignOut();
}
else if ((Request.QueryString["ReturnURL"] != null) && (Ar_new_Query[1].ToString().ToUpper() == "ELMAH.AXD"))
{
Session.Clear();
FormsAuthentication.SignOut();
}
else
{
HttpCookie Situation_Cookie = Request.Cookies["Situation"];
if (Situation_Cookie != null)
{
if (Situation_Cookie["Login"] == "Yes")
{
HttpCookie Data_Cookie = Request.Cookies["Data"];
if (Data_Cookie != null)
{
string UserName = Data_Cookie["UserName"].ToString();
string PassWord = ata_Cookie["PassWord"].ToString();
string HashedPass = FormsAuthentication.HashPasswordForStoringInConfigFile(PassWord, "MD5");
DataSet dsUsers = DataLayer.Users.SelectRowForLogin_FromCookie(UserName, HashedPass);
if (dsUsers.Tables["Users"].Rows.Count > 0)
{
DataRow drUsers = dsUsers.Tables["Users"].Rows[0];
if (Session["User_ID"] == null)
{
Session["UserName"] = UserName;
Session["Password"] = PassWord;
Session["User_ID"] = drUsers["ID"].ToString();
Session["UserType_ID"] = drUsers["UserType_ID"].ToString();
DataLayer.OnlineUsers.UpdateRow_UserID_By_SessionID(
Session["User_ID"],
Session.SessionID);
}
if (!HttpContext.Current.User.Identity.IsAuthenticated)
{
FormsAuthentication.SetAuthCookie(drUsers["ID"].ToString(), true);
}
}
}
}
}
}
}
也理解我的登入密码我使用RoleProvider象下面这样：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Data;
namespace NiceFileExplorer.Classes
{
public class NiceFileExplorerRoleProvider : RoleProvider
{
public override void AddUsersToRoles(string[] usernames, string[] roleNames)
{
throw new NotImplementedException();
}
public override string ApplicationName
{
get
{
throw new NotImplementedException();
}
set
{
throw new NotImplementedException();
}
}
public override void CreateRole(string roleName)
{
throw new NotImplementedException();
}
public override bool DeleteRole(string roleName, bool throwOnPopulatedRole)
{
throw new NotImplementedException();
}
public override string[] FindUsersInRole(string roleName, string usernameToMatch)
{
throw new NotImplementedException();
}
public override string[] GetAllRoles()
{
throw new NotImplementedException();
}
//public override string[] GetRolesForUser(string username)
public override string[] GetRolesForUser(string User_ID)
{
string[] UserTypes = new string[1];
DataSet dsUser = DataLayer.Users.SelectRowWithUserTypeInfo(int.Parse(User_ID));
if (dsUser.Tables["Users"].Rows.Count > 0)
{
DataRow drUser = dsUser.Tables["Users"].Rows[0];
UserTypes[0] = drUser["Name"].ToString();
}
if (User_ID == "-255")
{
UserTypes[0] = "Administrators";
}
return UserTypes;
}
public override string[] GetUsersInRole(string roleName)
{
throw new NotImplementedException();
}
public override bool IsUserInRole(string username, string roleName)
{
throw new NotImplementedException();
}
public override void RemoveUsersFromRoles(string[] usernames, string[] roleNames)
{
throw new NotImplementedException();
}
public override bool RoleExists(string roleName)
{
throw new NotImplementedException();
}
}
}
有时我有以下错误：
系统。 Web.HttpException：服务器在发送HTTP标头后无法修改cookie。
System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Web.HttpException (0x80004005): Server cannot modify cookies after HTTP headers have been sent.
at System.Web.HttpCookieCollection.Add(HttpCookie cookie)
at System.Web.Security.FormsAuthentication.SetAuthCookie(String userName, Boolean createPersistentCookie, String strCookiePath)
at NiceFileExplorer.en.Site1.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
看来问题是用于下面的行：
FormsAuthentication.SetAuthCookie;（drUsers [ “ID”]的ToString（），真）。
这个错误意味着什么，我该如何防止它？
感谢答案/但你瞧，我的方法没有SignOut或重定向（LoadDataFromCookieIfExistAndLogin（）），那么为什么仍然有错误 - >仅ELMAH表明我这个错误和视觉工作室在调试期间显示此错误。在浏览器页面上工作时，此错误不会显示！ – MoonLight
我的意思是FormsAuthentication.SignOut（）;请确保FormsAuthentication.SignOut（）;修改前不执行/设置cookie值 – testuser
- >没有FormsAuthentication.SignOut（）;在修改/设置cookie值之前，这正是我想知道为什么我有异常？ – MoonLight