An encoding operation calls the erload:System.Text.EncoderFallbackBuffer.Fallback method if the operation encounters an unknown character or surrogate pair in the input. For example, in the case of a replacement fallback, if the erload:System.Text.EncoderFallbackBuffer.Fallback method returns true, a substitute string exists that can be encoded instead of the unknown input. The encoding operation calls the EncoderFallbackBuffer.GetNextChar method repeatedly and obtains the substitute string one character at a time. When all characters in the fallback buffer have been returned to the encoder, the EncoderFallbackBuffer.GetNextChar method should return U+0000.

For an exception fallback handler, the EncoderFallbackBuffer.GetNextChar method should return U+0000.

Namespace: System.Text
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0