Question

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



public partial class Details : System.Web.UI.Page
{
    string strcon = ConfigurationManager.ConnectionStrings["con"].ConnectionString;
    string objective = " ";

    protected void Page_Load(object sender, EventArgs e)
    {
           SqlConnection con = new SqlConnection(strcon);
           if (con.State == ConnectionState.Closed)
           {
               con.Open();
           }

           {
               String SQL = "SELECT TOP 2 * FROM QuestionBank ORDER BY NEWID()";
               SqlDataAdapter Adpt = new SqlDataAdapter(SQL, con);
               DataSet login1 = new DataSet();
               Adpt.Fill(login1);

               foreach (DataRow dr in login1.Tables[0].Rows)
               {
                   objective = login1.Tables[0].Rows[0]["s_id"].ToString() + "," + login1.Tables[0].Rows[1]["s_id"].ToString();

                   Label1.Text = login1.Tables[0].Rows[0]["question"].ToString();
                   Label2.Text = login1.Tables[0].Rows[0]["question"].ToString();

                   break;
               }
           }
       }

   protected void Button1_Click(object sender, EventArgs e))
    {

        SqlConnection con = new SqlConnection(strcon);
        if (con.State == ConnectionState.Closed)
        {
            con.Open();
        }

        SqlCommand cmd = new SqlCommand("Insert into PaperTbl values('" + objective + "','" + TextBox1.Text + "','" + TextBox2.Text + "')", con);
        cmd.ExecuteNonQuery();
        Response.Write("<script>alert('Answers Saved Successfully');location.href='Details.aspx'</script>");


    }
}

当我单击“保存”按钮时然后Label1和Label2中的问题得到更改因此，来自textbox1和textbox2的答案变得错误。因此，在保存数据时，将刷新并保存新问题而不是旧问题。请帮助我。

Answer 1

Page_Load 正在运行，您的 TextBox1_TextChanged 回发事件之前。因此，将填充新值，然后保存。

请参见此处以了解页面生命周期https://www.c-sharpcorner.com/UploadFile/8911c4/page-life-cycle-with-examples-in-Asp-Net/

这应该有效：

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

    private void LoadNew()
    {
        string strcon = ConfigurationManager.ConnectionStrings["con"].ConnectionString;
        string objective = " ";

        SqlConnection con = new SqlConnection(strcon);
        if (con.State == ConnectionState.Closed)
        {
            con.Open();
        }

        {
            String SQL = "SELECT TOP 2 * FROM QuestionBank ORDER BY NEWID()";
            SqlDataAdapter Adpt = new SqlDataAdapter(SQL, con);
            DataSet login1 = new DataSet();
            Adpt.Fill(login1);

            foreach (DataRow dr in login1.Tables[0].Rows)
            {
                objective = login1.Tables[0].Rows[0]["s_id"].ToString() + "," + login1.Tables[0].Rows[1]["s_id"].ToString();

                Label1.Text = login1.Tables[0].Rows[0]["question"].ToString();
                Label2.Text = login1.Tables[0].Rows[0]["question"].ToString();

                break;
            }
        }
    }

    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection(strcon);
        if (con.State == ConnectionState.Closed)
        {
            con.Open();
        }

        SqlCommand cmd = new SqlCommand("Insert into PaperTbl values('" + objective + "','" + TextBox1.Text + "','" + TextBox2.Text + "')", con);
        cmd.ExecuteNonQuery();

        LoadNew();

        Response.Write("<script>alert('Answers Saved Successfully');location.href='Details.aspx'</script>");


    }

数据库存储插入查询

1 个答案: