When adding data to ListBox, determine whether the added data already exists in ListBox

Use openfiledialog to select a file and put the selected file into ListBox. If you want to determine that the data to be added already exists in ListBox, do not add it.

I thought it was loop traversal, but it was very troublesome. I found a method on the Internet,

Directly paste the code

String STR = "";
If (openfiledialog1.showdialog () = dialogresult. OK)
{
For (INT I = 0; I <openfiledialog1.filenames. length; I ++)
{
STR = openfiledialog1.filenames. getvalue (I). tostring ();
// Determine whether the object exists in The ListBox set. If the object does not exist, add the object.
If (! Listbox1.items. Contains (STR ))
{
Listbox1.items. Add (STR );
}


}

}