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EncoderFallbackException Class
Visual Studio 2010
The exception that is thrown when an encoder fallback operation fails. This class cannot be inherited.
System::Object
System::Exception
System::SystemException
System::ArgumentException
System.Text::EncoderFallbackException
System::Exception
System::SystemException
System::ArgumentException
System.Text::EncoderFallbackException
Assembly: mscorlib (in mscorlib.dll)
The EncoderFallbackException type exposes the following members.
| Name | Description | |
|---|---|---|
![]() ![]() | EncoderFallbackException() | Initializes a new instance of the EncoderFallbackException class. |
![]() ![]() | EncoderFallbackException(String) | Initializes a new instance of the EncoderFallbackException class. A parameter specifies the error message. |
![]() ![]() | EncoderFallbackException(String, Exception) | Initializes a new instance of the EncoderFallbackException class. Parameters specify the error message and the inner exception that is the cause of this exception. |
| Name | Description | |
|---|---|---|
![]() ![]() | CharUnknown | Gets the input character that caused the exception. |
![]() ![]() | CharUnknownHigh | Gets the high component character of the surrogate pair that caused the exception. |
![]() ![]() | CharUnknownLow | Gets the low component character of the surrogate pair that caused the exception. |
![]() | Data | Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.) |
![]() | HelpLink | Gets or sets a link to the help file associated with this exception. (Inherited from Exception.) |
![]() ![]() | HResult | Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.) |
![]() ![]() | Index | Gets the index position in the input buffer of the character that caused the exception. |
![]() ![]() | InnerException | Gets the Exception instance that caused the current exception. (Inherited from Exception.) |
![]() | Message | Gets the error message and the parameter name, or only the error message if no parameter name is set. (Inherited from ArgumentException.) |
![]() | ParamName | Gets the name of the parameter that causes this exception. (Inherited from ArgumentException.) |
![]() | Source | Gets or sets the name of the application or the object that causes the error. (Inherited from Exception.) |
![]() ![]() | StackTrace | Gets a string representation of the immediate frames on the call stack. (Inherited from Exception.) |
![]() | TargetSite | Gets the method that throws the current exception. (Inherited from Exception.) |
| Name | Description | |
|---|---|---|
![]() ![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() ![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() ![]() | GetBaseException | When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.) |
![]() ![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetObjectData | Sets the SerializationInfo object with the parameter name and additional exception information. (Inherited from ArgumentException.) |
![]() | GetType | Gets the runtime type of the current instance. (Inherited from Exception.) |
![]() | IsUnknownSurrogate | Indicates whether the input that caused the exception is a surrogate pair. |
![]() ![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() ![]() | ToString | Creates and returns a string representation of the current exception. (Inherited from Exception.) |
| Name | Description | |
|---|---|---|
![]() | SerializeObjectState | Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception.) |
The following code example demonstrates the EncoderExceptionFallback and EncoderFallbackException classes.
// This example demonstrates the EncoderExceptionFallback class. using namespace System; using namespace System::Text; int main() { // Create an encoding, which is equivalent to calling the // ASCIIEncoding class constructor. // The EncoderExceptionFallback parameter causes an exception to // be thrown when a character cannot be encoded. // A decoder exception fallback is also specified, but it is not // used because this example terminates during the encoding operation. Encoding^ asciiEncoding = Encoding::GetEncoding("us-ascii", gcnew EncoderExceptionFallback(), gcnew DecoderExceptionFallback()); // The input string consists of the Unicode characters LEFT POINTING // DOUBLE ANGLE QUOTATION MARK (U+00AB), 'X' (U+0058), and RIGHT // POINTING DOUBLE ANGLE QUOTATION MARK (U+00BB). // The encoding can only encode characters in the US-ASCII range of // U+0000 through U+007F. Consequently, the characters bracketing the // 'X' character cause an exception. String^ inputString = L"\u00abX\u00bb"; String^ twoNewLines = Environment::NewLine + Environment::NewLine; array<Byte>^ encodedBytes = gcnew array<Byte>( asciiEncoding->GetMaxByteCount(inputString->Length)); int numberOfEncodedBytes = 0; // --------------------------------------------------------------------- Console::Clear(); // Display the name of the encoding. Console::WriteLine("The name of the encoding is \"{0}\".{1}", asciiEncoding->WebName, Environment::NewLine); // Display the input string in text. Console::WriteLine("Input string ({0} characters): \"{1}\"", inputString->Length, inputString); // Display the input string in hexadecimal. Console::Write("Input string in hexadecimal: "); for each (char c in inputString) { Console::Write("0x{0:X2} ", c); } Console::Write(twoNewLines); // --------------------------------------------------------------------- // Attempt to encode the input string. However, an exception is thrown // before the input string can be encoded. Console::WriteLine("Encode the input string..."); // The code example terminates during the call to the GetBytes() method. try { numberOfEncodedBytes = asciiEncoding->GetBytes(inputString, 0, inputString->Length, encodedBytes, 0); // This statement is never executed. Console::WriteLine("This statement is never executed."); } catch (EncoderFallbackException^ ex) { Console::WriteLine(ex); Console::WriteLine( "{0}*** THE CODE EXAMPLE TERMINATES HERE AS INTENDED. ***", Environment::NewLine); } } /* This code example produces the following results: The name of the encoding is "us-ascii". Input string (3 characters): "X" Input string in hexadecimal: 0xAB 0x58 0xBB Encode the input string... System.Text.EncoderFallbackException: Unable to translate Unicode character \u00AB at inde x 0 to specified code page. at System.Text.EncoderExceptionFallbackBuffer.Fallback(Char charUnknown, Int32 index) at System.Text.EncoderFallbackBuffer.InternalFallback(Char ch, Char*& chars) at System.Text.ASCIIEncoding.GetBytes(Char* chars, Int32 charCount, Byte* bytes, Int32 byteCount, EncoderNLS encoder) at System.Text.ASCIIEncoding.GetBytes(String chars, Int32 charIndex, Int32 charCount, B yte[] bytes, Int32 byteIndex) at Sample.Main() *** THE CODE EXAMPLE TERMINATES HERE AS INTENDED. *** */
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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