c# – 将数据行转换为JSON对象

America              |  Africa               |     Japan     |   
   -------------------------------------------------------------
  {"Id":1,"Title":"Ka"} | {"Id":2,"Title":"Sf"} | {"Id":3,"Title":"Ja","Values":{"ValID":4,"Type":"Okinawa"}}

{
"America": {
    "Id": 1,"Title": "Ka"
},"Africa": {
    "Id": 2,"Title": "Sf"
},"Japan": {
    "Id": 3,"Title": "Ja","Values": {
        "ValID": 4,"Type": "Okinawa"
    }
   }
  }

string js = JSonConvverter.Serializeobject(datatable);
    var objType =  JObject.Parse(js);

Json.NET有一个特殊的内置转换器 DataTableConverter,它以缩写格式输出数据表.虽然它也有 one for DataSet,但它没有 DataRow的特定内置转换器.因此,在序列化DaTarow时,它将序列化DaTarow的所有字段和属性,从而产生更详细的输出.

如果要以DataTable使用的更紧凑的形式序列化DaTarow,最简单的方法是使用JArray.FromObject()将整个表序列化为JArray,然后选择第一个元素,如下所示：

var datatable = MakeTable();

        var objType = JArray.FromObject(datatable,JsonSerializer.CreateDefault(new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore })).FirstOrDefault(); // Get the first row            
        var js = objType.ToString(); 

        Debug.WriteLine(js); // Outputs abbreviated JSON as desired.

哪个输出：

06001

完整示例：

public class Values
{
    public int ValID { get; set; }
    public string Type { get; set; }
}

public class Place
{
    public int Id { get; set; }
    public string Title { get; set; }
    public Values Values { get; set; }
}

public class TestClass
{
    static DataTable MakeTable()
    {
        var table = new DataTable();

        table.Columns.Add("America",typeof(Place));
        table.Columns.Add("Africa",typeof(Place));
        table.Columns.Add("Japan",typeof(Place));

        DaTarow row = table.NewRow();

        row["America"] = JsonConvert.DeserializeObject<Place>(@"{""Id"":1,""Title"":""Ka""}");
        row["Africa"] = JsonConvert.DeserializeObject<Place>(@"{""Id"":2,""Title"":""Sf""}");
        row["Japan"] = JsonConvert.DeserializeObject<Place>(@"{""Id"":3,""Title"":""Ja"",""Values"":{""ValID"":4,""Type"":""Okinawa""}}");
        table.Rows.Add(row);    
        return table;

    }

    public static void test()
    {
        var datatable = MakeTable();

        var objType = JArray.FromObject(datatable,JsonSerializer.CreateDefault(new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore })).FirstOrDefault(); // Get the first row            
        var js = objType.ToString(); 

        Debug.WriteLine(js); // Outputs abbreviated JSON as desired.
    }
}