从流中加载多个连接的 JSON 对象 [英] Load multiple concatenated JSON objects from stream

问题描述

我阅读了几个类似的问题，但没有找到任何与 JObject 相关的问题.这是问题所在:我有一个带有连接 JSON 对象的 Stream，即:

I read a couple of similar questions but didn't find any one related to JObject. Here's the problem: I have a Stream with concatenated JSON objects, i.e:

{"key1":"value1"}{"key2":"value2"}{"key3":"value3"}

现在，我想将这些对象一一读入JObject.以下是我尝试的方法:

Now, I want to read these objects one by one into JObject. Here's how I tried to do it:

public class JsonStreamReader : JsonTextReader
{
    public JsonStreamReader(Stream s) : base(new StreamReader(s)) {}
}

private void LoadJson(Stream s)
{
    var r = new JsonStreamReader(s) { SupportMultipleContent = true };
    var obj = JObject.Load(r);
    // ... get data from JObject ...
}

这里的问题是 JObject.Load() 从流中读取所有可用数据，但只解析第一个对象并丢弃所有其他对象.我该如何处理?

The problem here is that JObject.Load() reads all available data from stream, but parses only first object and discards all the rest. How do I deal with that?

如果出现 XY 问题(我为什么需要它):我想通过 TCP 流传输 JSON 消息.因为我使用原始 TCP 流，所以我需要知道消息的大小才能读取它.我决定在每条消息之前用 size 和 message type 写小标题，这样我就可以将标题读入一个小缓冲区，获取以下消息的大小然后读取它完全.

And just in case of XY-problem (why do I need that): I want to transfer JSON messages via TCP stream. Because I use raw TCP stream, I need to know the size of message to read it. I decided to write small header with size and message type before each message, so I can read the header into a small buffer, get the size of the following message and then read it entirely.

推荐答案

您可以通过将 JsonReader 上的 SupportMultipleContent 设置为 true 来实现:

You can do that by setting SupportMultipleContent on JsonReader to true:

使用 JsonReader 读取多个片段

如果将 JObject.Load 与该设置一起使用时出现问题，请改用 JsonConvert.DeserializeObject.

If there is an issue with using JObject.Load with that setting then use JsonConvert.DeserializeObject instead.

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