在派生类中重写时，计算对字节序列（从指定的字节指针开始）进行解码所产生的字符数。

When overridden in a derived class, calculates the number of characters produced by decoding a sequence of bytes from the specified byte array.

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在派生类中重写时，将一组字符(从指定的字符指针开始)编码为一个字节序列，并从指定的字节指针开始存储该字节序列。

When overridden in a derived class, encodes a set of characters starting at the specified character pointer into a sequence of bytes that are stored starting at the specified byte pointer.

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