Question

我有两个DataTable，RCPT_HEADER和RCPT_DETAIL，并尝试使用Json.NET / C＃序列化为json对象层次结构。我已经尝试了代码

static JArray DataToArray(string connString, string query)
        {
            JArray jArray = new JArray();
            try
            {
                using (SqlConnection conn = new SqlConnection(connString))
                {
                    conn.Open();
                    using (SqlCommand cmd = new SqlCommand(query, conn))
                    {
                        SqlDataReader reader = cmd.ExecuteReader();
                        while (reader.Read())
                        {
                            int fieldcount = reader.FieldCount;
                            object[] values = new object[fieldcount];
                            reader.GetValues(values);
                            JObject jo = new JObject();

                            for (int index = 0; index < fieldcount; index++)
                            {
                                jo.Add(reader.GetName(index).ToString(), values[index].ToString());
                            }
                            jArray.Add(jo);
                        }
                        reader.Close();
                    }
                }
            }
            catch (SqlException e)
            {
                WriteLog("[DataToArray]: " + e.Message);
            }
            return jArray;
        }

和

 static void Main(string[] args)
            {
                try
                {
                    Hashtable config = getSettings(AppPath() + "mware.config");
                    string connString = config["cs"].ToString();
                    StringBuilder sb = new StringBuilder();
                    StringWriter sw = new StringWriter(sb);
                    JsonWriter jsonWriter = new JsonTextWriter(sw);
                    jsonWriter.Formatting = Newtonsoft.Json.Formatting.Indented;
                    JObject jObject = new JObject();
                    JArray jArray = new JArray();

                    jObject.Add("RCPT_HEADER", DataToArray(connString, "SELECT * FROM RCPT_HEADER"));
                    jObject.Add("RCPT_DETAIL", DataToArray(connString, "SELECT * FROM RCPT_DETAIL"));
                    jObject.WriteTo(jsonWriter);
                    Console.WriteLine(jObject.ToString());
                    Console.ReadLine();
                } 
                catch (Exception e)
                {
                    WriteLog("[postJSON]: " + e.Message);
                }
            }

但是我这样输出：

 {
    "RCPT_HEADER": [
        {
            "RECORD_ID": "1",
            "ACTION_CODE": "SAVE",
            "CONDITION": "Ready",
            "DATE_TIME_STAMP": "9/11/2015 12:00:00 AM"
        }
    ],
    "RCPT_DETAIL": [
        {
            "RECORD_ID": "1",
            "ACTION_CODE": "SAVE",
            "CONDITION": "Ready",
            "LINK_ID": "1",
            "ITEM": "SKU00048700007683",
            "DATE_TIME_STAMP": "9/11/2015 12:00:00 AM"
        },
        {
            "RECORD_ID": "2",
            "ACTION_CODE": "SAVE",
            "CONDITION": "Ready",
            "LINK_ID": "1",
            "ITEM": "SKU00048700007684",
            "DATE_TIME_STAMP": "9/11/2015 12:00:00 AM"
        }
    ]
}

实际上，我希望它能像这样返回输出：

{
    "RCPT_HEADER": [
        {
            "RECORD_ID": "1",
            "ACTION_CODE": "SAVE",
            "CONDITION": "Ready",
            "DATE_TIME_STAMP": "9/11/2015 12:00:00 AM",
            "RCPT_DETAIL": [
                {
                    "RECORD_ID": "1",
                    "ACTION_CODE": "SAVE",
                    "CONDITION": "Ready",
                    "LINK_ID": "1",
                    "ITEM": "SKU00048700007683",
                    "DATE_TIME_STAMP": "9/11/2015 12:00:00 AM"
                },
                {
                    "RECORD_ID": "2",
                    "ACTION_CODE": "SAVE",
                    "CONDITION": "Ready",
                    "LINK_ID": "1",
                    "ITEM": "SKU00048700007684",
                    "DATE_TIME_STAMP": "9/11/2015 12:00:00 AM"
                }
            ]
        }
    ]
}

任何帮助都会非常感激，因为这是我第一次尝试使用JSON.NET。

Answer 1

当您使用数据表时，它将以这种方式将表序列化为JSON数组表您可以编写自己的JsonConverter，以便按照自己的方式对其进行序列化。这是a good article。

但是，在我看来，还有另一个好的但是hacky解决方案：如果你总是拥有相同的结构并且不需要太多的性能，那么再次反序列化它会更容易，移动这个对象并将其序列化。
像这样：

string json = "YOUR_JSON_RESULT";

JObject jsonObject = JObject.Parse(json);

((JObject)jsonObject["RCPT_HEADER"][0])
        .Properties()
        .Last()
        .AddAfterSelf(new JProperty("RCPT_DETAIL", jsonObject["RCPT_DETAIL"]));
jsonObject.Remove("RCPT_DETAIL");

string jsonResult = jsonObject.ToString();

还有另一种优雅且听起来合适的解决方案。您使用数据表，但是您需要通过实现自定义序列化程序或修改器来使其变为序列化，就像它不是表格一样。可能你只是不需要数据表如果可能，请不要使用它 - 使用您自己的类，以便您可以描述任何嵌套和序列化顺序：

public class RcptDetail
{
    public string RECORD_ID { get; set; }
    /* ... */
}

public class RcptHeader
{
    public string RECORD_ID { get; set; }
    /* ... */
    public RcptDetail RCPT_DETAIL { get; set; }
}

序列化的标题详细信息到JSON对象层次结构中

1 个答案: