c# - Json.Net无法序列化为流，但是可以很好地序列化为字符串

在内部，JsonConvert.SerializeObject(obj, Formatting.Indented)归结为

JsonSerializer jsonSerializer = JsonSerializer.Create(null);
StringWriter stringWriter = new StringWriter(new StringBuilder(256), (IFormatProvider) CultureInfo.InvariantCulture);
using (JsonTextWriter jsonTextWriter = new JsonTextWriter((TextWriter) stringWriter))
{
  jsonTextWriter.Formatting = formatting;
  jsonSerializer.Serialize((JsonWriter) jsonTextWriter, value);
}
return stringWriter.ToString();

这样很好。但是，如果我执行以下操作:

string json;

JsonSerializer jsonSerializer = JsonSerializer.Create();

using (var stream = new MemoryStream())
using (var streamWriter = new StreamWriter(stream, Encoding.UTF8))
using (var jsonWriter = new JsonTextWriter(streamWriter))
{
    serializer.Serialize(jsonWriter, cmd);

    stream.Position = 0;
    using (var reader = new StreamReader(stream))
    {
        json = reader.ReadToEnd();
    }
}

那么json的值为""。谁能指出我的错误？

最佳答案

问题是您没有在编写后刷新streamWriter:

serializer.Serialize(jsonWriter, cmd);
streamWriter.Flush();
stream.Position = 0;

另外，为什么不只使用StringWriter开头呢？

using (var writer = new StringWriter())
{
    using (var jsonWriter = new JsonTextWriter(writer))
    {
        serializer.Serialize(jsonWriter, cmd);
        Console.WriteLine(writer.ToString());
    }
}

关于c# - Json.Net无法序列化为流，但是可以很好地序列化为字符串，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/9845741/