问题描述

听说Json.NET比DataContractJsonSerializer快，想试一试……

I have heard that Json.NET is faster than DataContractJsonSerializer, and wanted to give it a try...

但我在 JsonConvert 上找不到任何采用流而不是字符串的方法.

But I couldn't find any methods on JsonConvert that take a stream rather than a string.

以在WinPhone上反序列化包含JSON的文件为例，我使用以下代码将文件内容读入字符串，然后反序列化为JSON.在我的(非常临时的)测试中，它似乎比使用 DataContractJsonSerializer 直接从流中反序列化慢了大约 4 倍......

For deserializing a file containing JSON on WinPhone, for example, I use the following code to read the file contents into a string, and then deserialize into JSON. It appears to be about 4 times slower in my (very ad-hoc) testing than using DataContractJsonSerializer to deserialize straight from the stream...

// DCJS
DataContractJsonSerializer dc = new DataContractJsonSerializer(typeof(Constants));
Constants constants = (Constants)dc.ReadObject(stream);

// JSON.NET
string json = new StreamReader(stream).ReadToEnd();
Constants constants = JsonConvert.DeserializeObject<Constants>(json);

我做错了吗?

推荐答案

更新: 这在当前版本中不再有效，请参阅 下方获取正确答案(无需投票，这在旧版本上是正确的).

UPDATE: This no longer works in the current version, see below for correct answer (no need to vote down, this is correct on older versions).

将 JsonTextReader 类与 StreamReader 一起使用，或直接使用采用 StreamReader 的 JsonSerializer 重载:

Use the JsonTextReader class with a StreamReader or use the JsonSerializer overload that takes a StreamReader directly:

var serializer = new JsonSerializer();
serializer.Deserialize(streamReader);

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