如何从c＃中的dropdownlist控件中删除项目

Question

I have a dropwdown list with few items like this(in the format "name-number"):

     George Michael - 456456
     Justin Dukes - 5644654
     Peter Heins - 5456454
     Mark Twain - 4454564

Now i have to delete an item from the above list based on the value i have from other query.

My other query gives me a number in string format and i have to remove exactly the same item which is in the above dropdownlist second part(after hyphen).

For ex: My query gives me "5456454".

Now I have to remove the third item(Peter Heins - 5456454) from the dropdownlist which matches with the number my query returns.

I am trying to use

ddl.Items.Remove

But Im not getting what parameter i should pass. Both the text and value fields are same in the dropdownlist and i cannot modify that. So i cannot use

ddl.Items.FindByValue()

Any help?

Thanks in advance.

Answer 1

You could do something like this:

var removeItem = ddl.Items.Cast<ListItem>()
                          .Where(x => x.Value.Contains(number))
                          .FirstOrDefault()

ddl.Items.Remove(removeItem);

Answer 2

If you're populating your DropDownList with ListItem objects, I would set the text for example to "Peter Heins - 5456454" and the value to "5456454".

     ListItem exampleItem = new ListItem("Peter Heins - 5456454", "5456454"); 

Then, you could do as you described and call

     string value = "5456454";
     ListItem valueToRemove = ddl.Items.FindByValue(valueToRemove);
     dd1.Remove(valuetoRemove);

edit: If you absolutely cannot change the value (whether it be for school purposes or some other reason) I would do something like this.

        string id = "5456454";
        foreach (ListItem item in dd1.Items)
        {
            if (item.Text.Contains(id))
            {
                dd1.Items.Remove(item);
            }
        }