Question

c#中怎么实现两个下拉列表的联级操作

Answer 1

后面的下拉列表根据前面下拉列表选中的元素进行检索和填充

Answer 2

在第一个的 下拉列表控件的 SeletedIndexChange 事件里面 写第二个下拉列表控件的代码

Answer 3

/// <summary>
/// 加载省信息
/// </summary>
private void JzProvince()
{
this.ddlprovince.DataSource = BLL.NewInfo.TerminalOperator.TheInstance.GetProvinceInfo();
this.ddlprovince.DataTextField = "ProvinceName";
this.ddlprovince.DataValueField = "ProvinceID";
this.ddlprovince.DataBind();
} /// <summary>
/// 根据省初始化市
/// </summary>
private void InitCityByProvince()
{
ddlcity.Items.Clear();
String pid = ddlprovince.SelectedValue;
DataSet ds = BLL.NewInfo.TerminalOperator.TheInstance.GetProvinceInfoByCityID(Int32.Parse(pid));
this.ddlcity.DataSource = ds;
this.ddlcity.DataTextField = "CityName";
this.ddlcity.DataValueField = "CityID";
this.ddlcity.DataBind();
}
/// <summary>
/// 当省的信息改变时，加载其下面的市
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void ddlprovince_SelectedIndexChanged(object sender, EventArgs e)
{
InitCityByProvince();
}