非静态字段、方法或属性需要对象引用'

本文关键字：对象引用 属性 字段 静态 方法 | 更新日期: 2023-09-27 17:49:35

出现如下错误

非静态字段、方法或对象引用是必需的属性"System.Web.UI.Page.Session.get"

你能建议我在会议中解决这个问题吗? 

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.Services;
    using System.Configuration;
    using System.Data.SqlClient;
    using System.Web.SessionState;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    //Onclick Submit Button
    [WebMethod(EnableSession = true)]
    //[System.Web.Services.WebMethod(EnableSession = true)]
    public static string Login(string email, string password)
    {
        var con = new SqlConnection(ConfigurationManager.ConnectionStrings["blogConnString"].ConnectionString);
        con.Open();
        string res = "0";
        SqlDataReader reader;       
        string sql = "select uid,username from personal where email='" + email + "' and password='" + password + "'";
        SqlCommand cmd1 = new SqlCommand(sql, con);       
        reader = cmd1.ExecuteReader();
        while (reader.Read())
        {
            res = "1";
            Session["UID"] = reader["uid"].ToString();           //error line here
            Session["UNAME"] = reader["username"].ToString();    //error line here
         }
        return res;
        con.Close();
    }
}

非静态字段、方法或属性需要对象引用'

尝试这段代码，请注意SQL注入-为了防止它，请使用参数化查询，如下所示:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
using System.Configuration;
using System.Data.SqlClient;
using System.Web.SessionState;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    //Onclick Submit Button
    [WebMethod(EnableSession = true)]
    //[System.Web.Services.WebMethod(EnableSession = true)]
    public static string Login(string email, string password)
    {
        var con = ConfigurationManager.ConnectionStrings["blogConnString"].ConnectionString;
        con.Open();
        string res = "0";
        SqlDataReader reader;       
        string sql = "select uid,username from personal where email=@Email and password=@Password";
        using(SqlConnection connection = new SqlConnection(con))
        {
            SqlCommand command = new SqlCommand(commandText, connection);
            command.Parameters.Add("@Email", SqlDbType.String);
            command.Parameters["@Email"].Value = email;
            command.Parameters.AddWithValue("@Password", password);       
            reader = command.ExecuteReader();
            while (reader.Read())
            {
               res = "1";
               HttpContext.Current.Session["UID"] = reader["uid"].ToString();           //Either Remove Static from Method Declaration or use HttpContext.Current along with session.
               HttpContext.Current.Session["UNAME"] = reader["username"].ToString();
            }
        }
        return res;
        con.Close();
    }
}

不要让你的方法变成静态的。它不需要是静态的，它可以防止您使用任何非静态属性(如Session)。让它:

public string Login(string email, string password)
{
    ....
}

另外，不要连接SQL查询，尤其是来自UI的值。这使您容易受到SQL注入的攻击。使用SQLParameters。

你可以用它来插入一个变量到会话:

HttpContext.Current.Session["UID"] = reader["uid"].ToString();

，不要使用静态

public string Login(string email, string password)
{
}
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