If you've tried using a
DataContractJsonSerializer
or a
DataContractSerializer
with Push Notification for the Windows Phone, you may have experienced an
ArgumentNullException
during deserialization. This can happen because the
MemoryStream
is buffered with null characters '\0' that prevent deserialization. A solution is to create a new array and copy all bytes except for the trailing nulls, as shown in the following excerpt:
using (BinaryReader reader = new BinaryReader(bodyStream))
{
byte[] bodyBytes = reader.ReadBytes((int)bodyStream.Length);
int lengthWithoutNulls = bodyBytes.Length;
for (int i = bodyBytes.Length - 1; i >= 0 && bodyBytes[i] == '\0';
i--, lengthWithoutNulls--)
{
}
byte[] cleanedBytes = new byte[lengthWithoutNulls];
Array.Copy(bodyBytes, cleanedBytes, lengthWithoutNulls);
DataContractJsonSerializer serializer
= new DataContractJsonSerializer(typeof(StockQuote));
using (MemoryStream stream = new MemoryStream(cleanedBytes))
{
StockQuote = (StockQuote)serializer.ReadObject(stream);
}
}
This excerpt is from the downloadable sample code in my upcoming book
Windows Phone 7 Unleashed.
Have a great day!