在ASP.NET中如何将数据库的数据（Name）显示到DropDownList中，如Post表中有，ID,Name，Explication 5
5个回答
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<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="ddlProvince" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlProvince_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlCity" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlCity_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlDist" runat="server">
</asp:DropDownList>
</div>
</form>
</body>
cs代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
namespace Ganged
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bind();
}
}
//数据绑定
private void Bind()
{
using (SqlConnection con = new SqlConnection("server=.;database=ganged;uid=sa;pwd=sa;"))
{
con.Open();
//先初始化省
SqlCommand cmdPro = new SqlCommand("select ProID,ProName from T_Province", con);
SqlDataReader drPro = cmdPro.ExecuteReader();
this.ddlProvince.DataSource = drPro;
this.ddlProvince.DataTextField ="ProName";//显示值
this.ddlProvince.DataValueField = "ProID"; //显示主键
this.ddlProvince.DataBind();
drPro.Close();
//初始化市
SqlCommand cmdCity = new SqlCommand("select CityID,CityName from T_City where ProID='" + this.ddlProvince.SelectedValue + "'", con);
SqlDataReader drCity = cmdCity.ExecuteReader();
this.ddlCity.DataSource = drCity;
this.ddlCity.DataTextField = "CityName";
this.ddlCity.DataValueField = "CityID";
this.ddlCity.DataBind();
drCity.Close();
//初始化县
SqlCommand cmdDist = new SqlCommand("select id,DisName from T_District where CityID='" +this.ddlCity.SelectedValue + "'",con);
SqlDataReader drDist = cmdDist.ExecuteReader();
this.ddlDist.DataSource = drDist;
this.ddlDist.DataTextField = "DisName";
this.ddlDist.DataValueField = "id";
this.ddlDist.DataBind();
drDist.Close();
}
}
protected void ddlProvince_SelectedIndexChanged(object sender, EventArgs e) //DropDownList选中(省改变)产生的事件
{
string ProID = this.ddlProvince.SelectedValue;
using (SqlConnection con = new SqlConnection("server=.;database=ganged;uid=sa;pwd=sa;"))
{
con.Open();
SqlCommand cmdCity = new SqlCommand("select CityID,CityName from T_City where ProID='" + ProID + "'", con);
SqlDataReader drCity = cmdCity.ExecuteReader();
this.ddlCity.DataSource = drCity;
this.ddlCity.DataTextField = "CityName";
this.ddlCity.DataValueField = "CityID";
this.ddlCity.DataBind();
drCity.Close();
con.Close();
ddlCityBind();
}
}
protected void ddlCity_SelectedIndexChanged(object sender, EventArgs e)//DropDownList选中(市改变)产生的事件
{
ddlCityBind();
}
private void ddlCityBind()
{
string CityID = this.ddlCity.SelectedValue;
using (SqlConnection con = new SqlConnection("server=.;database=ganged;uid=sa;pwd=sa;"))
{
con.Open();
SqlCommand cmdDist = new SqlCommand("select id,DisName from T_District where CityID='" + CityID + "'", con);
SqlDataReader drDist = cmdDist.ExecuteReader();
this.ddlDist.DataSource = drDist;
this.ddlDist.DataTextField = "DisName";
this.ddlDist.DataValueField = "id";
this.ddlDist.DataBind();
drDist.Close();
}
}
}
}
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="ddlProvince" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlProvince_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlCity" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlCity_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlDist" runat="server">
</asp:DropDownList>
</div>
</form>
</body>
cs代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
namespace Ganged
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bind();
}
}
//数据绑定
private void Bind()
{
using (SqlConnection con = new SqlConnection("server=.;database=ganged;uid=sa;pwd=sa;"))
{
con.Open();
//先初始化省
SqlCommand cmdPro = new SqlCommand("select ProID,ProName from T_Province", con);
SqlDataReader drPro = cmdPro.ExecuteReader();
this.ddlProvince.DataSource = drPro;
this.ddlProvince.DataTextField ="ProName";//显示值
this.ddlProvince.DataValueField = "ProID"; //显示主键
this.ddlProvince.DataBind();
drPro.Close();
//初始化市
SqlCommand cmdCity = new SqlCommand("select CityID,CityName from T_City where ProID='" + this.ddlProvince.SelectedValue + "'", con);
SqlDataReader drCity = cmdCity.ExecuteReader();
this.ddlCity.DataSource = drCity;
this.ddlCity.DataTextField = "CityName";
this.ddlCity.DataValueField = "CityID";
this.ddlCity.DataBind();
drCity.Close();
//初始化县
SqlCommand cmdDist = new SqlCommand("select id,DisName from T_District where CityID='" +this.ddlCity.SelectedValue + "'",con);
SqlDataReader drDist = cmdDist.ExecuteReader();
this.ddlDist.DataSource = drDist;
this.ddlDist.DataTextField = "DisName";
this.ddlDist.DataValueField = "id";
this.ddlDist.DataBind();
drDist.Close();
}
}
protected void ddlProvince_SelectedIndexChanged(object sender, EventArgs e) //DropDownList选中(省改变)产生的事件
{
string ProID = this.ddlProvince.SelectedValue;
using (SqlConnection con = new SqlConnection("server=.;database=ganged;uid=sa;pwd=sa;"))
{
con.Open();
SqlCommand cmdCity = new SqlCommand("select CityID,CityName from T_City where ProID='" + ProID + "'", con);
SqlDataReader drCity = cmdCity.ExecuteReader();
this.ddlCity.DataSource = drCity;
this.ddlCity.DataTextField = "CityName";
this.ddlCity.DataValueField = "CityID";
this.ddlCity.DataBind();
drCity.Close();
con.Close();
ddlCityBind();
}
}
protected void ddlCity_SelectedIndexChanged(object sender, EventArgs e)//DropDownList选中(市改变)产生的事件
{
ddlCityBind();
}
private void ddlCityBind()
{
string CityID = this.ddlCity.SelectedValue;
using (SqlConnection con = new SqlConnection("server=.;database=ganged;uid=sa;pwd=sa;"))
{
con.Open();
SqlCommand cmdDist = new SqlCommand("select id,DisName from T_District where CityID='" + CityID + "'", con);
SqlDataReader drDist = cmdDist.ExecuteReader();
this.ddlDist.DataSource = drDist;
this.ddlDist.DataTextField = "DisName";
this.ddlDist.DataValueField = "id";
this.ddlDist.DataBind();
drDist.Close();
}
}
}
}
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public void abc(){
DataTable dt = PostService.getPost();
dropdownList1.DataSource = dt;
dropdownList1.DataTextField = "Name"; //库中 Name字段
dropdownList1.DataValueField = "ID";//库中 ID 字段
dropdownList1.DataBind();
}
DataTable dt = PostService.getPost();
dropdownList1.DataSource = dt;
dropdownList1.DataTextField = "Name"; //库中 Name字段
dropdownList1.DataValueField = "ID";//库中 ID 字段
dropdownList1.DataBind();
}
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private void BindDrop()
{
DataSet de = dalei.GetList("");
DropDownList1.DataSource = de;
DropDownList1.DataTextField = "Name";
DropDownList1.DataValueField = "ID";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem("-请选择-", "0"));
}
{
DataSet de = dalei.GetList("");
DropDownList1.DataSource = de;
DropDownList1.DataTextField = "Name";
DropDownList1.DataValueField = "ID";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem("-请选择-", "0"));
}
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那就将数据库中的数据取出，然后再添加到dropdowmlist控件中。
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用sqldatasource绑定数据库
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