The "2048" bug of DataContractJsonSerializer class.

Question

I found a bug of DataContractJsonSerializer class.
When I use this DataContractJsonSerializer.ReadObject method to deserialize a json string that contains more than 684 non-ANSI characters. I get an exception

There was an error deserializing the object of type WindowsFormsApplication1.Action. The token '"' was expected but found 'æ'.

I think there may be a bug in the DataContractJsonSerializer.ReadObject(Stream) method, with some code like 
byte[] bufferNonANSI = new byte[2048];
so that there is no enough space for a string with more than 683 non-ANSI characters.

I hope Microsoft developers for DataContractJsonSerializer class to look into the source code, and check the bug.  I want to use the class and need the bug to be fixed.

Thanks. 

---

Comm100

Answer 1

Hi Jeff,

Can you provide a simple code snipped that reproduces this problem? I tried with the code below, and for all strings from 0-1000 characters I didn't have any problems.

Thanks.

    public class Post_938156c7_ccb5_4436_833d_d560b9901750
    {
        public static void Test()
        {
            for (int stringSize = 0; stringSize < 1000; stringSize++)
            {
                string str = new string((char)0xF000, stringSize);
                string jsonString = "\"" + str + "\"";
                MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
                DataContractJsonSerializer dcjs = new DataContractJsonSerializer(typeof(string));
                try
                {
                    string str2 = (string)dcjs.ReadObject(ms);
                    if (str == str2)
                    {
                        Console.Write(".");
                    }
                    else
                    {
                        Console.WriteLine();
                        Console.WriteLine("Error, different strings for stringSize = {0}", stringSize);
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine();
                    Console.WriteLine("{0}: {1}", e.GetType().FullName, e.Message);
                }
                if ((stringSize % 50) == 49) Console.WriteLine();
            }
        }
    }

Answer 2

Ok, Riquel_Dong

I give you an String like:

string str = new string((char)0x6cd5, stringSize);  //which contains 1000 "法" word in chinese.

Please have a try, and then you will get an exception.

Thanks.

Answer 3

Please help me, I am waiting for result.

Thank you very much!