Throws an exception because the input character cannot be encoded. Parameters specify the value and index position of the surrogate pair in the input, and the nominal return value is not used.
None. No value is returned because the EncoderExceptionFallbackBuffer.Fallback(char, char, int) method always throws an exception.
The erload:System.Text.Encoding.GetBytes and erload:System.Text.Encoder.Convert methods call EncoderExceptionFallbackBuffer.Fallback(char, char, int) if they encounter a surrogate pair in their input. In response, EncoderExceptionFallbackBuffer.Fallback(char, char, int) always throws an exception.