如何用另一个DDL填充下拉列表 [英] How to populate a dropdown list with another ddl

问题描述

如何使用选定的值用另一个下拉列表填充一个下拉列表，我尝试了以下代码，但它使用业务逻辑填充了ddl.

how do i populate a dropdownlist with another dropdownlist list using a selected value, i tried the following code but it populates the ddl with business logic.

protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
     {
            Service obj = new Service ();
            List <Service > slist = new List<Service> ();
            Int32 ser = Convert .ToInt32  (DropDownList2.SelectedValue);
            slist = obj.allServcieBYfk(ser);
            drpDwnService.DataSource = slist;
            
            drpDwnService.DataBind();
        }

推荐答案

，但它使用业务逻辑填充ddl"

"but it populates the ddl with business logic"

slist = obj.allServcieBYfk(ser);
drpDwnService.DataSource = slist;

是的，这正是您要它执行的操作.

您希望发生什么事?

Yes, that is doing exactly what it is you are asking it to do.

What is it you expect to happen?

马克说的没错，不清楚是怎么回事?欲了解更多信息，请参阅以下

级联DropDownList根据ASP.NET中其他下拉菜单的选择填充下拉菜单 [^ ]
CascadingDropDown [

Mark is right, Not clear what''s the matter? For further reading see these

Cascading DropDownList Populate dropdown based on selection of other dropdown in ASP.NET[^]
CascadingDropDown[^]

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