Question

在登录页面上应用表单身份验证之前，我可以从网站的主页重定向到登录和注册页面，但在登录页面上应用表单身份验证后，每当我尝试重定向到登录页面时，它都会显示错误（下面图片）：

我无法找出我犯错误的地方。我发布了登录页面和web.config文件的.cs代码。仔细看看。告诉我我在哪里犯错误，解决方案是什么。

LoginPage.aspx.cs： -

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
using System.Web.Security;


public partial class Registration_LoginPage : System.Web.UI.Page
{
Code code = new Code();
SqlConnection con;
SqlCommand cmd;
bool flag = true;

public Registration_LoginPage()
{
    con = new SqlConnection();
    con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
    cmd = new SqlCommand();
}


protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    { 

    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.Cache.SetExpires(DateTime.Now);
    Response.Cache.SetNoServerCaching();
    Response.Cache.SetNoStore();
    }

    if(User.Identity.Name !=String.Empty)
    {
        FormsAuthentication.RedirectFromLoginPage(User.Identity.Name, false);
    }


}

protected void btnLogIn_Click(object sender, EventArgs e)
{
   // String encryptedPassword = code.encrypt(Request.Form["password"]);

    try
    {
        con.Open();
        cmd.CommandText = "select * from [Users]";
        cmd.Connection = con;
        SqlDataReader rd = cmd.ExecuteReader();

        if (Request.Form["username"] == "admin" && Request.Form["password"] == "admin")
        {
            Session["Username"] = Request.Form["username"];
            Response.Redirect("/AdminHome/AdminMPage.aspx");
        }
        else
        {

            while (rd.Read())
            {
                if (rd["UserName"].ToString() == Request.Form["username"] && rd["Password"].ToString() == Request.Form["password"])
                {
                    Session["Username"] = rd["UserName"];
                    flag = false;
                    break;
                }
            }
            if (flag == true)
                lblMsg.Text = "Username and password invalid";
            else
            {
                if (rd["Role"].ToString() == "Student")
                    //  Response.Redirect("Student.aspx");
                    FormsAuthentication.RedirectFromLoginPage(rd["Role"].ToString(), false);

                /* else
                     Response.Redirect("Teacher.aspx");  */

                if (rd["Role"].ToString() == "Teacher")
                    FormsAuthentication.RedirectFromLoginPage(rd["Role"].ToString(), false);
            }
        }
    }
    catch (Exception ex)
    {
        lblMsg.Text = ex.Message;

    }
}

}

的web.config

＆＃13;

<?xml version="1.0"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>

  <connectionStrings>
    <add name="ConnectionString" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True"
        providerName="System.Data.SqlClient" />
  </connectionStrings>

  

    <system.web>


      <authentication mode="Forms">

        <forms loginUrl="/Registration/LoginPage.aspx">

        </forms>

      </authentication>


      <compilation debug="true" targetFramework="4.5.2" />
      <httpRuntime targetFramework="4.5.2" />
    </system.web>
  
  <location path="FIRST PAGE">
      <system.web>
        <authorization>
          <allow users="*"/>
          
        </authorization>
      </system.web>
    </location>
  
  <location path="Registration">
      <system.web>
        <authorization>
          <allow users="*"/>
          
        </authorization>
      </system.web>
    </location>
  
  
    <location path="AdminHome">
      <system.web>
        <authorization>
          <allow users="admin"/>
          <deny users="*"/>
        </authorization>
      </system.web>
    </location>
  
  <location path="Student">
      <system.web>
        <authorization>
          <allow roles="Student"/>
          <deny users="*"/>
        </authorization>
      </system.web>
    </location>
  
<location path="Teacher">
      <system.web>
        <authorization>
          <allow roles="Teacher"/>
          <deny users="*"/>
        </authorization>
      </system.web>
    </location>

  <appSettings>

    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
    
  </appSettings>
  

</configuration>

＆＃13;

Answer 1

请注意，使用FormsAuthentication.RedirectFromLoginPage需要Username和persistence，因此rd["Role"].ToString()无效。

请按照此示例，因为它将为您提供快速解决方案。 FormsAuthentication.RedirectFromLoginPage to a custom page

使用表单身份验证后无法重定向到登录页面

1 个答案: