保存数据后如何更新gridview？

Question

我有一个包含 4 列的网格视图（用户 ID、描述、密码、更改密码[按钮]）。

当我单击更改密码时，会出现带有 3 个文本框（用户 ID、新密码、确认密码）的面板并显示保存按钮。

更改密码后，面板消失，但网格视图中的密码与以前相同。

我想更新密码栏。

以下是我的保存按钮点击
代码

protected void BindGridView()
{
    try
    {
        DataTable dt = new DataTable();
        dt = (DataTable)Session["userinfo"];

        gvPassInfo.DataSource = dt;
        gvPassInfo.DataBind();
    }
    catch (Exception ex)
    {
        //lblMessage.Text = DataObjects.Error_Message();
    }  
 }
 protected void btnSave_Click(object sender, EventArgs e)
 {
    clsUser objuser = new clsUser();
    string user = txtUserid.Text;
    string NewPassword = txtNewPassword.Text;
    string ConfirmPassword = txtConfirmNewPassword.Text;
    objuser.UpdateSystemPassword(user, NewPassword);
    Response.Write("<script LANGUAGE='JavaScript' >alert('Password Changed   Successfully...'); document.location='" +ResolveClientUrl("~\\PasswordInformation_Details.aspx") + "'; </script>");
    BindGridView();
    panelChangePassword.Visible = false;

   }                                                                                     
protected void btnSearch1_Click(object sender, EventArgs e)
{
    try
    {
        using (MySqlConnection conn = new MySqlConnection(clsUser.connStr))
        {
            conn.Open();
            string strQuery = "select DISTINCT user_id,description,sap_system_password from sap_password_info where user_id is not null";
            if (txtSid.Text !="")
            {
                strQuery += " AND sid = '" + txtSid.Text + "'";
            }
            if (txtClient.Text != "")
            {
                strQuery += " AND client_no = '" + txtClient.Text + "'";
            }
            if (txtUser.Text != "")
            {
                strQuery += " AND user_id = '" + txtUser.Text + "'";
            }

            MySqlCommand cmd = new MySqlCommand(strQuery, conn);
            DataTable dt = new DataTable();
            dt.Load(cmd.ExecuteReader(CommandBehavior.CloseConnection));
            Session["userinfo"] = dt;
            Response.Redirect("~\\PasswordInformation_Details.aspx");
        }
    }
    catch (Exception ex)
    {
        //lblMessage.Text = DataObjects.Error_Message();
        lblMsg.Text = ex.Message.ToString();
    }

}

代码是C#，后端是MySQL DB Server..请帮忙..

Answer 1

在 button_click 事件中，将您的 gridview 绑定到一个新列表。

List<something> k = //your sql stuff
GridView1.DataSource = k;
GridView1.DataBind();

Answer 2

阅读此tutorial。互联网上有很多针对 ASP.NET 初学者的教程。谷歌它..

已编辑：保存密码后，从数据库（而不是会话）加载您的 datatable 并将其再次绑定到您的网格视图。

这样

DataTable dt = new DataTable();
dt = //LoadFromDB();    // load data from database not session

gvPassInfo.DataSource = dt;
gvPassInfo.DataBind(); 

Answer 3

在您的更新事件/保存按钮点击事件结束时更新GridView

编辑

您正在更新数据库中的记录，但您没有获取新数据，这就是您获取旧信息的原因

所以在下面的语句从数据库中获取数据并用新数据更新会话数据集之后，你的问题就会解决......

 objuser.UpdateSystemPassword(user, NewPassword);
 //get the updated data from the database after this statement
 //don't forget to update the session with new data

在旧页面中写这段代码

Dictionary<string,string> infor = new Dictionary<string,string>();
infor["sid"] = txtSid.Text;
infor["client_no"] = txtClient.Text;
..
...
Session["queryInfo"] = infor;

在新文件中

GetDataFromDB()
{
Dictionary<string,string> infor = (Dictionary<string,string>)Session["queryInfo"];

try
{
    using (MySqlConnection conn = new MySqlConnection(clsUser.connStr))
    {
        conn.Open();
        string strQuery = "select DISTINCT user_id,description,sap_system_password from sap_password_info where user_id is not null";
        if (infor["sid"] !="")
        {
            strQuery += " AND sid = '" + infor["sid"] + "'";
        }
        //... do like above for remaining if conditions

        MySqlCommand cmd = new MySqlCommand(strQuery, conn);
        DataTable dt = new DataTable();
        dt.Load(cmd.ExecuteReader(CommandBehavior.CloseConnection));
        Session["userinfo"] = dt;
        //Response.Redirect("~\\PasswordInformation_Details.aspx");
    }
}
catch (Exception ex)
{
     throw;
}
}