Asynchronously reads the element and decodes the BinHex content.
buffer The buffer into which to copy the resulting text. This value cannot be null.index The offset into the buffer where to start copying the result.count The maximum number of bytes to copy into the buffer. The actual number of bytes copied is returned from this method.
The number of bytes written to the buffer.
This is the asynchronous version of XmlReader.ReadElementContentAsBinHex(Byte[], int, int), with the same functionality. To use this method, you must set the XmlReaderSettings.Async flag to true.