KeyNotFoundException Exception

You tried to access an item in a Dictionary using a key that is not in the Dictionary.

# Example

The following For loop produces a KeyNotFoundException error when the loop runs with the counter equal to 2. The value of 2 -- which is a Variant, not an Integer -- has just been removed.

Dim d as New Dictionary
Dim i as Integer
d.Value(1)="ID"
d.Value(2)="Lois Lane"
d.Value(3)="Reporter"
d.Value(4)=84000
d.Remove(2)
For i=1 to d.Count //fails when i=2
ListBox1.Addrow d.value(i)
Next

To handle the error, add an Exception block to the end of the method, such as:

Exception err as KeyNotFoundException
MsgBox "You tried to access a nonexistent item!"

# See Also

Dictionary, RuntimeException classes; Exception block.