反序列化用引号括起来的 JSON 字符串

Question

有没有办法正确反序列化以双引号开头和结尾的 JSON 字符串？

这是从文件中读取的流的内容：

"[{\"startTime\":1610396717400,\"eventCode\":44,\"eventParam\":5},{\"startTime\":1610396717700,\"eventCode\":81,\"eventParam\":56},{\"startTime\":1610396717800,\"eventCode\":44,\"eventParam\":4}"

JsonSerializer 似乎没有正确反序列化。 但是，对于具有以下内容的 JSON 文件，它按预期工作：

[{"startTime":1610396717400,"eventCode":44,"eventParam":5},{"startTime":1610396717700,"eventCode":81,"eventParam":56}]

这是片段：

public class ControllerEventJson
{
    [JsonProperty("startTime")]
    public long StartTime { get; set; }

    [JsonProperty("eventCode")]
    public int EventCode { get; set; }

    [JsonProperty("eventParam")]
    public int EventParam { get; set; }
}


class Program
{
    static void Main(string[] args)
    {
        using (Stream stream = File.Open("test.json", FileMode.Open))
        using (StreamReader sr = new StreamReader(stream))
        using (JsonTextReader reader = new JsonTextReader(sr))
        {
            // Required for large JSON objects to avoid errors when streaming
            reader.SupportMultipleContent = true;

            JsonSerializer serializer = new JsonSerializer();
            while (reader.Read())
            {
                // Deserialize each object in array individually
                if (reader.TokenType == JsonToken.StartObject)
                {
                    var obj = serializer.Deserialize<ControllerEventJson>(reader);
                    // Do something with obj
                }
            }
        }
    }
}

Answer 1

好吧，我的意思是，如果您只想去掉开头和结尾的引号，那么您可以检查它并在使用 StreamReader 读取它之前人为地显式删除它们。 像这样的东西：

        string fileName = @"c:\temp\test.json";
        string data = File.ReadAllText(fileName);
        string newFileName = "";
        //If quotation marks are at the start or end, then remove them
        if (data.StartsWith(@"""") || data.EndsWith(@""""))
        {
            newFileName = Path.GetTempFileName();
            using (StreamWriter sw = new StreamWriter(newFileName))
            {
                sw.Write(data.Trim('"'));
            };
        }

        using (Stream stream = File.Open(newFileName != "" ? newFileName : fileName, FileMode.Open))
        using (StreamReader sr = new StreamReader(stream))
        using (JsonTextReader reader = new JsonTextReader(sr))
        {
            // Required for large JSON objects to avoid errors when streaming
            reader.SupportMultipleContent = true;

            JsonSerializer serializer = new JsonSerializer();
            while (reader.Read())
            {
                // Deserialize each object in array individually
                if (reader.TokenType == JsonToken.StartObject)
                {
                    //do stuff
                }
            }
        }

        if (newFileName != "") File.Delete(newFileName); //Clean up after yourself