Question

我已经编写了用于登录检查和用户类型检查的C＃代码。逻辑似乎是正确的，但为什么输出不正确？

我在这里做了一些编辑。请立即查看。

没有重定向没有重定向没有重定向正在进行

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

namespace Bidders_Joint
{
    public partial class WebForm2 : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnLogin_Click(object sender, EventArgs e)
        {


            string constr = ConfigurationManager.ConnectionStrings["BiddersJoint"].ToString();
            string type;
            SqlConnection con = new SqlConnection(constr);
            SqlCommand cmd = new SqlCommand("select Type from TABLE_USER where User_ID = @userid AND Password=@password", con);
            cmd.Parameters.AddWithValue("@userid", txtUserid.Text.ToString());
            cmd.Parameters.AddWithValue("@password", txtPassword.Text.ToString());
            try
            {
                con.Open();//cmd.Connection.Open();
                SqlDataReader dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    if (dr.HasRows)
                    {
                        type = dr["Type"].ToString();
                        if (type == "admin")
                        {
                            Response.Redirect("administrator.aspx");
                            Response.End();
                        }
                        else if (type == "general")
                        {
                            Response.Redirect("userspage.aspx");
                            Response.End();
                        }
                    }

                    else
                    {
                        lblMessage.Text = "wrong userid or password";
                    }
                }

            }
            catch (Exception ex)
            {
                lblMessage.Text = ex.Message;
            }
            finally
            {
                con.Close(); //cmd.Connection.Close();
            }
        }
    }
}

Answer 1

将第一个和第二个if与else：

连接起来

while (dr.Read())
{
      password = dr["Password"].ToString();
      type = dr["Type"].ToString();
      if ((password == txtPassword.Text.ToString()) && (type == "admin"))
      {
         Response.Redirect("administrator.aspx");
      }
      else if ((password==txtPassword.Text.ToString()) && (type=="general"))
      {
         Response.Redirect("userspage.aspx");
      }
}

lblMessage.Text = "wrong userid or password";

<强>更新

                while (dr.Read())
                {
                        type = dr["Type"].ToString();
                        if (type == "admin")
                        {
                            Response.Redirect("administrator.aspx");
                            Response.End();
                        }
                        else if (type == "general")
                        {
                            Response.Redirect("userspage.aspx");
                            Response.End();
                        }
                }
                lblMessage.Text = "wrong userid or password";

我已经编写了用于登录检查和用户类型检查的C＃代码。逻辑似乎是正确的，但为什么输出不正确？

1 个答案: