asp.net Web应用程序中的文本框控件出现问题。 没有从文本框中获取文本以进行更新

Question

我有一个表格AdminHome.aspx 。 当用户登录时，然后在AdminHome.aspx页面的Load Event上，该用户对从数据库加载的数据进行配置并填充相应的Textboxes 。 我有一个用于Update User Information的Button控件。 User登录后，这就是其Home Page外观。 这是图片。

现在，当我将名称从INTERN更改为Trainee 。 这是图片 然后点击Update My Profile按钮。 它不显示任何Errors或Exceptions ，而是显示一条消息， Record Update Successfully 。 但是当我在数据库中检查它时，它没有被更新。 在将其置于debug mood ，我知道它采用了Textboxes的旧值，我的意思是我将Designation的值从INTERN更改为TRAINEE但仍然采用了INTERN 。 这是图片 以下是我的update Button代码

        protected void btnUpdateProfile_Click(object sender, EventArgs e)
    {
        try
        {
                UpdateUser();
        }
        catch (Exception ex)
        {
            ShowNotification("Error: " + ex + "", WarningType.Danger);
        }
    }

    private void UpdateUser()
    {
        using (SqlConnection con = new SqlConnection(Base.GetConnection))
        {

            using (SqlCommand cmd = new SqlCommand("UPDATE TableUserProfile SET UserName=@UserName,UserContact=@UserContact,UserDesignation=@UserDesignation,UserDepartment=UserDepartment WHERE UserEmpNum=@UserEmpNum", con))
            {
                string Uname, UContact, UDesignation, UDepartment, UEmployeeNo;
                Uname = tbName.Value.ToUpper();
                UContact = tbMobileNo.Value.ToUpper();
                UDesignation = tbDesignation.Value.ToUpper();
                UDepartment = tbDepartment.Value.ToUpper();
                UEmployeeNo = tbEmployeeNo.Value.ToUpper();
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("@UserName", Uname);
                cmd.Parameters.AddWithValue("@UserContact", UContact);
                cmd.Parameters.AddWithValue("@UserDesignation", UDesignation);
                cmd.Parameters.AddWithValue("@UserDepartment", UDepartment);
                cmd.Parameters.AddWithValue("@UserEmpNum", UEmployeeNo);
                con.Open();
                cmd.ExecuteNonQuery();
                ShowNotification("Succes: Record Saved Succesfully!", WarningType.Success);
            }
        }
    }

这是.aspx代码。

 <asp:Content ID="Content2" ContentPlaceHolderID="MainContentPlaceHolder" runat="server"> <div class="container"> <div class="row"> <div class="col-md-8"> <div class="card"> <div class="card-body"> <div class="row"> <div class="col-md-10"> <h4>Your Profile</h4> <hr /> </div> </div> <div class="row"> <div class="col-md-12"> <div class="form-group row"> <label for="username" class="col-4 col-form-label">Name*</label> <div class="col-6"> <input runat="server" id="tbName" class="form-control here" required="required" type="text" /> </div> </div> <div class="form-group row"> <label for="name" class="col-4 col-form-label">Mobile Number</label> <div class="col-6"> <input runat="server" id="tbMobileNo" class="form-control here" type="text" /> </div> </div> <div class="form-group row"> <label for="lastname" class="col-4 col-form-label">Employee Number</label> <div class="col-6"> <input runat="server" id="tbEmployeeNo" class="form-control here" readonly="True" type="text" aria-readonly="True" aria-disabled="True" /> </div> </div> <div class="form-group row"> <label for="text" class="col-4 col-form-label">Designation</label> <div class="col-6"> <input runat="server" id="tbDesignation" class="form-control here" required="required" type="text" /> </div> </div> <div class="form-group row"> <label for="text" class="col-4 col-form-label">Department</label> <div class="col-6"> <input runat="server" id="tbDepartment" class="form-control here" required="required" type="text" /> </div> </div> <div class="form-group row"> <div class="offset-4 col-8"> <asp:Button runat="server" ID="btnUpdateProfile" Text="Update My Profile" class="btn btn-primary" OnClick="btnUpdateProfile_Click"></asp:Button> </div> </div> </div> </div> </div> </div> </div> </div> </div> </asp:Content> 

这是PageLoad代码。

     protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["UserEmployee"] != null)
        {
            userEmployeeNumber = Convert.ToString(Session["UserEmployee"]);
            GetUserData();
            ShowNotification("Welcome! Mr/Mrs " + EmployeeID.UserName.ToString() + "", WarningType.Success);
        }
    }

    private void GetUserData()
    {
        using (SqlConnection con = new SqlConnection(Base.GetConnection))
        {
            con.Open();
            using (SqlCommand cmd = new SqlCommand("SELECT [UserName],[UserContact],[UserEmpNum],[UserDesignation],[UserDepartment] FROM TableUserProfile WHERE UserEmpNum=@UserEmpNum", con))
            {
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("UserEmpNum", userEmployeeNumber);
                SqlDataReader r = cmd.ExecuteReader();

                while (r.Read())
                {
                    tbName.Value = r["UserName"].ToString();
                    EmployeeID.UserName = tbName.Value.ToString();
                    tbMobileNo.Value = r["UserContact"].ToString();
                    tbEmployeeNo.Value = r["UserEmpNum"].ToString();
                    tbDesignation.Value = r["UserDesignation"].ToString();
                    tbDepartment.Value = r["UserDepartment"].ToString();
                }
            }
        }
    }

Answer 1

在您的Page_Load中，您必须检查IsPostBack

 protected void Page_Load(object sender, EventArgs e)
 {
       if(!Page.IsPostBack)   
       {
        if (Session["UserEmployee"] != null)
        {
            userEmployeeNumber = Convert.ToString(Session["UserEmployee"]);
            GetUserData();
            ShowNotification("Welcome! Mr/Mrs " + EmployeeID.UserName.ToString() + "", WarningType.Success);
        }
      }
 }

否则，在每个页面加载中，您的文本框数据将使用DB值更新