I'm trying to remove an item from a Generic List
which is bound to a repeater control.
So far I've got a remove method (after scouring the interwebs) that should of been working:
Label lblMemberName = (Label)e.Item.FindControl("lblMemberName");
switch (e.CommandName)
{
case "RemoveMember":
foreach (challenge.Member member in Members.Where(member => member.Name == lblMemberName.Text))
{
//This line doesnt work
Members.Remove(member);
}
break;
}
Unfortunately, the actual removal apart of this scenario is not working.
I understand that you can't create a new
instance of a List<>
to delete. So, that's why I used the Linq
statement to find the previous details.
What am I doing wrong and how could possibly ix it?
As above, you cannot modify the contents of a collection whilst iterating over it.
You could also try List(T).RemoveAll() . Refer to LINQ: How to Use RemoveAll without using For loop with Array . This is a more succinct solution than another list.
It's illegal to modify the list you're foreach-ing through. You can, however, convert it to a for-loop instead of foreach, and modify it then.
for (int i=0; i < Members.Count; i++)
{
if (Members[i].Name == lblMemberName.Text)
Members.RemoveAt(i--); // decrement because we just shrunk the list)
}
Get the member:
var member = Members.FirstOrDefault(i=>i.Name.Equals(thename));
And then remove it from list:
if (member != null)
{
Members.Remove(member);
}
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