I have a textbox that filters listbox results, and if I type it all caps it won't return anything, but all lower will. I want to see if I missed something. Here is what I am using.
Thanks
private void Filter(object sender, FilterEventArgs e)
{
var src = e.Item as Users;
if (src == null)
e.Accepted = false;
//else if (src.Name!= null && !src.Name.Contains(Search))
else if (src.Name!= null && !src.Name.ToLower().Contains(Search))
e.Accepted = false;
}
Internally string.Contains is implemented using IndexOf and an OrdinalCompare enum.
So your code could be changed to use a simple IndexOf without incurring the penalty required by the ToLower method that return a new copy of the original string.
if (src == null || string.IsNullOrEmpty(src.Name))
e.Accepted = false;
else if (src.Name.IndexOf(Search, StringComparison.CurrentCultureIgnoreCase) < 0)
e.Accepted = false;
Strings are immutable, meaning that once created you can't change a string.
A method like ToLower actually creates a new string object to hold the new sequence of characters of the lower case kind, and that new object is returned.
Change your Search to lower case also
else if (src.Name!= null && !src.Name.ToLower().Contains(Search.ToLower()))
e.Accepted = false;
