Parameters

chars

The character array containing the set of characters to encode.

index

The index of the first character to encode.

count

The number of characters to encode.

Returns

The number of bytes produced by encoding the specified characters.

Exceptions

Type	Reason
ArgumentNullException	chars is null .
ArgumentOutOfRangeException	The return value is greater than int.MaxValue. -or- index or count is less than zero. -or- index and count do not specify a valid range in chars (i.e. (index + count) > chars.Length).
ArgumentException	Error-checking is turned on for the current instance and chars contains an invalid surrogate sequence.

Remarks

To calculate the exact array size required by UTF8Encoding.GetBytes(string, int, int, Byte[], int) to store the resulting bytes, the application uses UTF8Encoding.GetByteCount(Char[], int, int). To calculate the maximum array size, the application should use UTF8Encoding.GetMaxByteCount(int). The UTF8Encoding.GetByteCount(Char[], int, int) method generally allows allocation of less memory, while the UTF8Encoding.GetMaxByteCount(int) method generally executes faster.

With error detection, an invalid sequence causes this method to throw a ArgumentException. Without error detection, invalid sequences are ignored, and no exception is thrown.

Note:

To ensure that the encoded bytes are decoded properly, the application should prefix encoded bytes with a preamble.

Requirements