c# - 通过 json.net 从流中反序列化多个对象

Question

您好!我需要反序列化序列化为 json 的不同对象的文件。这是生成的文件:

{
  "Number": 1,
  "Description": "Run version with strategy data",
  "Context": "NA"
}[
  {
    "N": 0.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.0,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 1.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.2999999523162842,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 2.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.0,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 3.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.2999999523162842,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 4.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.0,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 5.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.2999999523162842,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 6.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.0,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 7.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.2999999523162842,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 8.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.0,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  },
  {
    "N": 9.0,
    "T": 2.0,
    "Adc": [
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0,
      0.0
    ],
    "SpltFr": 2.2999999523162842,
    "Acc": 1.0,
    "DAcc": 0.0,
    "Acc2": 1.0,
    "OscFr": 0.5,
    "Fltr": 0,
    "CmpEr": false,
    "ErrPck": 0,
    "IndxDiff": 0,
    "Pos": 0,
    "FastAcc": [],
    "GIndx": 0,
    "Indx": 0,
    "PcTime": "0001-01-01T00:00:00"
  }
]

我正在使用 json.net，但它似乎无法正常工作。

StreamReader reader = new StreamReader(fileName, Encoding.GetEncoding(1251));
var serializer = new JsonSerializer() { CheckAdditionalContent = false };
var obj1 = serializer.Deserialize(reader, typeof(Type1));
var obj2 = serializer.Deserialize(reader, typeof(Type2));

此代码只读取第一个对象并在读取第二个时抛出异常。我做错了什么？ json.net 甚至可以完成我的任务吗？提前致谢!

考虑到本主题的一些建议，我将代码修改为:

using (FileStream fs = File.Open(fileName, FileMode.Open))
using (StreamReader sr = new StreamReader(fs, Encoding.GetEncoding(1251)))
using (JsonTextReader jr = new JsonTextReader(sr))
{

     JsonSerializer serializer = new JsonSerializer()
     {
            Formatting = Newtonsoft.Json.Formatting.Indented,
            CheckAdditionalContent = false,
            TypeNameHandling = TypeNameHandling.Auto

     };
     var data1 = serializer.Deserialize(jr, typeof(Type1));

     var data2 = serializer.Deserialize(jr, typeof(List<Type2>));
}

但是还是不能正常工作。似乎在读取第一个对象后，我的光标不会立即停在它的末尾，而是停在第二个对象的某处。因此，我的读者无法再阅读任何对象。

Answer 1

更新:最新的 JSON.NET 大师现在通过在 JsonReader 上设置 SupportMultipleContent 来支持这一点。

---

据我所知，JSON.NET 不支持这个，所以我决定实现这个功能。结果是 on github ，用法是这样的:

var reader = new JsonTextReader(
    new StreamReader(fileName, Encoding.GetEncoding(1251)));
var serializer = new JsonSerializer { CheckAdditionalContent = false };
var obj1 = serializer.Deserialize(reader, typeof(Type1));
var obj2 = serializer.Deserialize(reader, typeof(Type2));

您需要在此处显式使用 JsonTextReader，因为它保存从 TextReader 读取的字符。