c# – 使用Json.net将大型数据列表作为JSON格式流式传输

//Current implementation:
response.Write(Newtonsoft.Json.JsonConvert.SerializeObject(Data,formatting));
response.End();

//I know I can use the JsonSerializer instead
Newtonsoft.Json.JsonSerializer serializer = new Newtonsoft.Json.JsonSerializer();
serializer.Serialize(textWriter,Data);

假设您的最终输出是一个JSON数组,并且每个“块”是该数组中的一个项目,您可以尝试类似下面的JsonStreamingResult类.它使用JsonTextWriter将JSON写入输出流,并使用JObject作为在将每个项目写入writer之前单独序列化的方法.您可以将JsonStreamingResult传递给IEnumerable实现,该实现可以从您的数据源中单独读取项目,这样您就不会将它们全部存储在内存中.我没有对此进行过广泛的测试,但它应该让你朝着正确的方向前进.

public class JsonStreamingResult : ActionResult
{
    private IEnumerable itemsToSerialize;

    public JsonStreamingResult(IEnumerable itemsToSerialize)
    {
        this.itemsToSerialize = itemsToSerialize;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        var response = context.HttpContext.Response;
        response.ContentType = "application/json";
        response.ContentEncoding = Encoding.UTF8;

        JsonSerializer serializer = new JsonSerializer();

        using (StreamWriter sw = new StreamWriter(response.OutputStream))
        using (JsonTextWriter writer = new JsonTextWriter(sw))
        {
            writer.WriteStartArray();
            foreach (object item in itemsToSerialize)
            {
                JObject obj = JObject.FromObject(item,serializer);
                obj.WriteTo(writer);
                writer.Flush();
            }
            writer.WriteEndArray();
        }
    }
}