我如何在ASP.net中动态创建多个DropDownList VB

Question

我希望DropDownLists出现的数量取决于BulletedList中的项目。我尝试了下面的代码。

昏暗的数量作为新的DropDownList

For Each x As ListItem In BulletedList1.Items 

     quantity.ID = "mylist" 
     quantity.Items.Add(New ListItem("1", "1")) 
     quantity.Items.Add(New ListItem("2", "2")) 
     quantity.Items.Add(New ListItem("3", "3")) 
     quantity.Items.Add(New ListItem("4", "4")) 
     quantity.Items.Add(New ListItem("5", "5")) 
     PlaceHolder1.Controls.Add(quantity) 
    Next 

Answer 1

你需要为每一个下拉唯一的ID，你也需要创建循环内的下拉列表。

Dim counter As Integer = 0 
For Each x As ListItem In BulletedList1.Items 
    counter += 1   
    Dim quantity As New DropDownList 
    quantity.ID = "mylist" & counter 
    quantity.Items.Add(New ListItem("1", "1")) 
    quantity.Items.Add(New ListItem("2", "2")) 
    quantity.Items.Add(New ListItem("3", "3")) 
    quantity.Items.Add(New ListItem("4", "4")) 
    quantity.Items.Add(New ListItem("5", "5")) 
    PlaceHolder1.Controls.Add(quantity) 
Next