使用Json.Net序列化对象会导致Out of Memoryexception

免责声明:我确实完成了这里提供的大部分解决方案,但大部分都是在反序列化时讨论OOMexception。

我正在尝试使用Json.Net将对象(它是一个树)序列化为Json。 一切都适用于小对象但我在尝试使用大对象时会出现OOMexception。 由于它适用于相同数据类型的较小对象,我假设没有循环引用(我确实检查了我的数据结构)。 有没有办法我可以将我的对象转换为流(这是一个Windowsapp store应用程序)并使用该流生成Json?

public static async Task SerializeIntoJson(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,这在Windows商店应用程序dll中是不可用的。

这是由于您尝试序列化的记录数量非常大,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。

如果你有Object使用TextWrite

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

如果你有字符串使用StringWriter

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

根据对问题的评论中的建议更新了代码 ,这有效!

 public static async Task SerializeIntoJson(string fileName, StorageFolder destinationFolder, Content content) { try { StorageFile file = await destinationFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting); using (var stream = await file.OpenStreamForWriteAsync()) { StreamWriter writer = new StreamWriter(stream); JsonTextWriter jsonWriter = new JsonTextWriter(writer); JsonSerializer ser = new JsonSerializer(); ser.Formatting = Newtonsoft.Json.Formatting.Indented; ser.PreserveReferencesHandling = PreserveReferencesHandling.Objects; ser.TypeNameHandling = TypeNameHandling.All; ser.Error += ReportJsonErrors; ser.Serialize(jsonWriter, content); jsonWriter.Flush(); } return true; } catch (NullReferenceException nullException) { logger.LogError("Exception happened while serializing input object, Error: " + nullException.Message); return false; } catch (Exception e) { logger.LogError("Exception happened while serializing input object, Error: " + e.Message, e.ToString()); return false; } }