asp.net：如何从下拉列表中删除项目？

Question

I have a dropdownlist, and in some cases need to remove an item (in the code-behind). I need to remove the item based on the value of the item.

How can I do this?

Answer 1

你可以使用这个：

myDropDown.Items.Remove(myDropDown.Items.FindByValue("TextToFind"));

Answer 2

Code:

ListItem removeItem= myDropDown.Items.FindByValue("TextToFind");
drpCategory.Items.Remove(removeItem);

Replace "TextToFind" with the item you want to remove.

Answer 3

myDropDown.Items.Remove(myDropDown.Items.FindByText("TextToFind"))

Answer 4

You can use the

myDropDown.Items.Remove(ListItem li);

or

myDropDown.Items.RemoveAt(int index);

to remove it using C#.

Answer 5

There is also a slightly simpler way of removing the value.

mydropdownid.Items.Remove("Chicago"); 
<dropdown id=mydropdown .....>

values

• Florida
• Texas
• Utah
• Chicago

Answer 6

myDropDown.Items.Remove(myDropDown.Items.FindByText("Chicago"));

Answer 7

I have Done Like this, i have remove all items except the value coming as 1 and 3.

ListItemCollection liCol = ddlcustomertype.Items;
for (int i = 0; i < liCol.Count;i++ )
{
    ListItem li = liCol[i];
    if (li.Value != "1" || li.Value != "3")
        ddlcustomertype.Items.Remove(li);
}

Answer 8

As other people have answered, you need to do;

myDropDown.Items.Remove(ListItem li);

but if you want the page to refresh asynchronously, the dropdown needs to be inside an asp:UpdatePanel

after you do the Remove call, you need to call:

yourPanel.Update();

Answer 9

Try this code.

If you can add any item and set value in dropdown then try it.

 dropdown1.Items.Insert(0, new ListItem("---All---", "0"));

You can Removed Item in dropdown then try it.

 ListItem removeItem = dropdown1.Items.FindByText("--Please Select--");
 dropdown1.Items.Remove(removeItem);

Answer 10

I would add an identifying Id or class to the dropbox and remove using Javascript.

The article here should help.

D

Answer 11

to insert into DropDownList:

DropDownList.Items.Insert(0, new ListItem("-- Select item --", "0"));

and to remove item from DropDownList:

DropDownList.Items.Remove(new ListItem("-- Select item --", "0"));