使用Json.Net序列化对象会导致内存不足异常 [英] Serializing an object using Json.Net causes Out of Memory exception

问题描述

免责声明:我确实经历了此处提供的大多数解决方案，但大多数人都在谈论反序列化时的OOM异常.

Disclaimer: I did went through most of the solution provided here but most of them were talking about OOM exception while Deserialization.

我正在尝试使用Json.Net将一个对象(它是一棵树)序列化为Json.一切都适用于小对象，但是当我尝试使用大对象时会出现OOM异常.因为它适用于相同数据类型的较小对象，所以我假设没有循环引用(我确实检查了它的数据结构). 是否可以将对象转换为流(这是Windows Store应用程序)并使用该流生成Json?

I am trying to serialize an object( it's a Tree) into Json using Json.Net. Everything works fine for small objects but i get OOM exception when i try it with large objects. As it works with smaller object of same datatype i am assuming there is no circular reference (I did inspect my data structure for it). Is there a way where i can convert my object into stream ( this is a Windows Store app ) and generate the Json using that stream ?

 public static async Task<bool> SerializeIntoJson<T>(string fileName, StorageFolder destinationFolder, Content content)
    {
        ITraceWriter traceWriter = new MemoryTraceWriter();
        try
        {

            string jsonString = JsonConvert.SerializeObject(content, Formatting.Indented, new JsonSerializerSettings
            {
                PreserveReferencesHandling = PreserveReferencesHandling.Objects,
                TypeNameHandling = TypeNameHandling.All,
                Error = ReportJsonErrors,
                TraceWriter = traceWriter,
                StringEscapeHandling = StringEscapeHandling.EscapeNonAscii
            });
            System.Diagnostics.Debug.WriteLine(traceWriter);

            StorageFile file = await destinationFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
            await Windows.Storage.FileIO.WriteTextAsync(file, jsonString);
            return true;
        }
        catch (NullReferenceException nullException)
        {
            System.Diagnostics.Debug.WriteLine(traceWriter);
            logger.LogError("Exception happened while serializing input object, Error: " + nullException.Message);
            return false;
        }
        catch (Exception e)
        {
            System.Diagnostics.Debug.WriteLine(traceWriter);
            logger.LogError("Exception happened while serializing input object, Error: " + e.Message, e.ToString());
            return false;
        }
    }

为了将我的对象转换为流，我发现的代码使用的是BinaryFormatter，Windows Store应用程序dll中没有该代码.

In order to convert my object into stream, the code i found out was using a BinaryFormatter which is not available in Windows store app dll's.

推荐答案

这是由于您要序列化的记录数量过多，这会占用大量内存.我发现此错误的解决方案是使用StreamWriter(JsonWriter或TextWriter)直接写入文档.

It is due to very large number of records you are trying to serialize, which occupies large memory. Solutions which I have found for this error as directly writing to the documents using StreamWriter(JsonWriter or TextWriter).

如果您有对象，请使用TextWrite

If you have Object use TextWrite

using (TextWriter textWriter = File.CreateText("LocalJsonFile.json"))
{
    var serializer = new JsonSerializer();
    serializer.Serialize(textWriter , yourObject);
}

如果您有字符串，请使用StringWriter

If you have string use StringWriter

  StringBuilder sb = new StringBuilder();
  StringWriter sw = new StringWriter(sb);

  using(JsonWriter textWriter = new JsonTextWriter(sw))
  {
     var serializer = new JsonSerializer();
     serializer.Serialize(textWriter, yourObject);
  }

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