Provides a failure-handling mechanism, called a fallback, for an encoded input byte sequence that cannot be converted to an output character. The fallback emits a user-specified replacement string instead of a decoded input byte sequence. This class cannot be inherited.
Assemblies: System.Text.Encoding (in System.Text.Encoding.dll)
mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|CreateFallbackBuffer||Creates a DecoderFallbackBuffer object that is initialized with the replacement string of this object. (Overrides DecoderFallback.CreateFallbackBuffer().)|
|Equals||Indicates whether the value of a specified object is equal to the object. (Overrides Object.Equals(Object).)|
|GetHashCode||Retrieves the hash code for the value of the object. (Overrides Object.GetHashCode().)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
A common reason for an encoding or decoding operation to fail is if the underlying encoding class does not provide a mapping between a character and an equivalent byte sequence. For example, an ASCIIEncoding object cannot decode a byte value greater than 0x7F. If an input byte sequence cannot be converted to an output character, a object emits a replacement string into the output to represent the original input byte sequence. The conversion process then continues to decode the remainder of the original input.
The replacement string used by a object is determined by the call to its class constructor. Two options are available:
Replacement with the default character. If you call the DecoderReplacementFallback() constructor, the replacement character is "?" (U+003F).
Replacement with a string of your choice. If you call the DecoderReplacementFallback(String) constructor, you provide the replacement string.
This class is one of two .NET Framework classes that implement different fallback strategies for handling decoding conversion failures. The other class is the DecoderExceptionFallback class, which throws a DecoderFallbackException when an invalid byte sequence is encountered.