如何将下拉列表值作为存储过程的参数传递
本文关键字:存储过程 参数传递 下拉列表 | 更新日期: 2023-09-27 18:08:03
我正在创建两个基本上绑定的下拉列表,一个用于PROVINCE和一个用于CITY。我有一个c# web应用程序项目:我希望城市的列表根据PROVINCE下拉列表中选择的项目进行更改。但是每次从PROVINCE列表中选择一个新项目时,CITY列表中的数据不会改变。我不知道问题出在哪里。它是在选定的索引更改或…?tnx
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;
namespace WebApplication3_DrpDwnListAndSQL
{
public partial class WebForm2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
func1();
func2();
//func3();
}
}
protected void DrpDwnProvince_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.Text = DrpDwnProvince.SelectedValue;
//string a = DrpDwnProvince.SelectedValue;
}
//First function for Province DrpDwnList
private void func1()
{
SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=DrpBoxDB;Data Source=ARASH-PC");
SqlDataAdapter com = new SqlDataAdapter("_Province_selectAll", con);
com.SelectCommand.CommandType = CommandType.StoredProcedure;
DataSet ds = new DataSet();
if (com != null)
{ com.Fill(ds); }
DrpDwnProvince.DataSource = ds;
DrpDwnProvince.DataTextField = "Prv_Name";
DrpDwnProvince.DataValueField = "Prv_Id";
DrpDwnProvince.DataBind();
}
//Second function for City DrpDwnList
private void func2()
{
SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=DrpBoxDB;Data Source=ARASH-PC");
SqlDataAdapter com1 = new SqlDataAdapter("_City_selectItems", con);
com1.SelectCommand.CommandType = CommandType.StoredProcedure;
com1.SelectCommand.Parameters.AddWithValue("@vari", DrpDwnProvince.SelectedValue);
DataSet ds1 = new DataSet();
if (com1 != null)
{ com1.Fill(ds1); }
DrpDwnCity.DataSource = ds1;
DrpDwnCity.DataTextField = "Cty_Name";
DrpDwnCity.DataValueField = "Cty_Id";
DrpDwnCity.DataBind();
}
//Third function for District DrpDwnList
// private void func3()
// {
// }
}
}
一种可能是AutoPostBack="true"
属性没有在.aspx文件的下拉列表中设置。这是在用户选择不同项时让页面响应所必需的。
例如:
<asp:DropDownList ID="DrpDwnProvince"
OnSelectedIndexChanged="DrpDwnProvince_SelectedIndexChanged"
AutoPostBack="true" runat="server" />
Update:根据下面的注释-看起来问题是func2()在事件处理程序中没有被调用。所以解决方案是这样的:
protected void DrpDwnProvince_SelectedIndexChanged(object sender, EventArgs e)
{
func2();
}