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	index < 0. -or- count < 0. -or- index and count do not specify a valid range in chars (i.e. ( index + count) > chars.Length).

Remarks

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