Json.NET 可以序列化/反序列化到/来自流吗?

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...

但是我在 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上反序列化一个包含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(非常特别的)测试中，它似乎比使用 DataContractJsonSerializer 从流中直接反序列化慢了大约 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?

答

UPDATE: 这不再适用于当前版本，请参阅下面以获得正确答案(无需否决，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).

使用带有 StreamReader 的 JsonTextReader 类或使用直接采用 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);

Json.NET 可以序列化/反序列化到/来自流吗?

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