DropDownList不使用数据库字段已经绑定好了实现两级联动

Question

这样会出现问题，怎么才能实现我选中一级下拉栏二级就会出现相应的信息

Answer 1

你好,
你的问题原因在于首先你在page_load 事件中绑定了ddlEmiName的数据,但是选择ddlEmiTeam的时候,你清除了ddlEmiName的数据,所以在foreach 匹配的时候,这时候的item 是空. 所以我建议你在ddlEmiTeam 的SelectedIndexChanged事件中做绑定功能. 参照如下:

 <asp:DropDownList ID="ddlEmiTeam" runat="server" OnSelectedIndexChanged="ddlEmiTeam_SelectedIndexChanged"  AutoPostBack="true"></asp:DropDownList>
<asp:DropDownList ID="ddlEmiName" runat="server" ></asp:DropDownList>

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                List<teamemis> teamemi = new List<teamemis>()
           {
               new teamemis(){ Name="aaa"},
               new teamemis(){ Name="bbb"},
               new teamemis(){ Name="ccc"}
           };
                ddlEmiTeam.DataSource = teamemi;
                ddlEmiTeam.DataTextField = "Name";
                ddlEmiTeam.DataValueField = "Name";
                ddlEmiTeam.DataBind();
            }


        }

        protected void ddlEmiTeam_SelectedIndexChanged(object sender, EventArgs e)
        {
            ddlEmiName.Items.Clear();
            string value = ddlEmiTeam.SelectedValue;
            List<Employee> employeesce = new List<Employee>()
                {
                     new Employee(){ Name="aaa",ChineseName="ax"},
                     new Employee(){ Name="bbb",ChineseName="bx"},
                     new Employee(){ Name="ccc",ChineseName="cx"}
                };
            foreach (var item in employeesce)
            {
                if (item.Name == value)
                {
                    ddlEmiName.Items.Add(item.ChineseName);
                }
            }
        }

 public class Employee
    {
        public string Name { get; set; }
        public string ChineseName { get; set; }
    }
    public class teamemis
    {
        public string Name { get; set; }
    }

如果你的数据与我不同或仍有其他问题,你可以给出你的所有代码包括数据.