SerializeObject抛出System.OutOfMemoryException [英] SerializeObject throws System.OutOfMemoryException

问题描述

"JsonConvert.SerializeObject"存在严重问题，我需要序列化超过500,000个字典记录以使序列化引发以下错误； System.OutOfMemoryException.我试图在foreach中分别序列化每个键，值对，但是它被锁定了.显然这是一个优化问题，但是我不知道从哪里开始，要序列化部分的线程? 这些功能可以正常工作，几乎没有值. 我的代码:

I have a serious problem with "JsonConvert.SerializeObject" I need to serialize more than 500,000 dictionary records to make serialize throws the following error; System.OutOfMemoryException. I tried to serialize each key, value pair individually in a foreach but it's locked. Apparently it is an optimization problem, but I do not know where to start, threads to serialize in parts? These functions works fine with few values. My code:

string json = JsonConvert.SerializeObject(DatatableToDictionary(dt), Newtonsoft.Json.Formatting.Indented);

public List<Dictionary<string, object>> DatatableToDictionary(DataTable dt, List<DataColumn> columns)
{
    return dt.Rows.Cast<DataRow>().Select(
         r => columns.ToDictionary(c => c.ColumnName, c => r[c.ColumnName])).ToList();
}

推荐答案

在处理大量数据时，可以将其流式传输到文件中，以免一次全部存储在内存中.

When you're dealing with a large amount of data, you can stream it to a file to avoid having it all in memory at once.

var filePath = @"C:\somewhere.json";

using (var fs = File.Open(filePath, FileMode.CreateNew))
using (var sw = new StreamWriter(fs))
using (var jw = new JsonTextWriter(sw))
{
    var serializer = new JsonSerializer();
    serializer.Serialize(jw, dictionary);
}

这将一次序列化一点，并避免在内存中有一个巨大的字符串.

This will serialize a bit at a time and avoid having a giant string in memory.

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