json.net写入无效的json?

似乎json.net正在编写无效的json,但如果是由于我的误用,我也不会感到惊讶。

它似乎在重复json的最后几个字符:

/* ... */ "Teaser":"\nfoo.\n","Title":"bar","ImageSrc":null,"Nid":44462,"Vid":17}]}4462,"Vid":17}]}

重复字符串是:

4462,"Vid":17}]}

我把它打印到控制台上,所以我不认为这是visual studio的文本可视化工具中的一个bug。

序列化代码:

       static IDictionary<int, ObservableCollection<Story>> _sectionStories;
       private static void writeToFile()
        {
            IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication();
            using (IsolatedStorageFileStream stream = storage.OpenFile(STORIES_FILE, FileMode.OpenOrCreate))
            {
                using (StreamWriter writer = new StreamWriter(stream))
                {
                    writer.Write(JsonConvert.SerializeObject(_sectionStories));
                }

            }

#if DEBUG
            StreamReader reader = new StreamReader(storage.OpenFile(STORIES_FILE, FileMode.Open));
            string contents = reader.ReadToEnd();

            JObject data = JObject.Parse(contents);
            string result = "";
            foreach (char c in contents.Skip(contents.Length - 20))
            {
                result += c;
            }
            Debug.WriteLine(result);

            // crashes here with ArgumentException
            // perhaps because JSON is invalid?
            var foo = JsonConvert.DeserializeObject<Dictionary<int, List<Story>>>(contents);
#endif
        }

我在这里做错什么了吗?还是虫子?有已知的解决方法吗?

奇怪的是, JObject.Parse() 不会抛出任何错误。

我正在为WindowsPhone7构建一个Silverlight应用程序。