Gets the atomized string containing the same characters as the specified range of characters in the given array.
The atomized string or null if the string has not already been atomized. If len is zero, String.Empty is returned.
Type Reason IndexOutOfRangeException start
< 0.
- or -
start >= key.Length.
- or -
len > key.Length - start.
The above conditions do not cause an exception to be thrown if len = 0.
ArgumentOutOfRangeException len < 0.
For more information on atomized strings, see System.Xml.NameTable.