将数据表转换为不带表头的JSON

Question

我正在尝试将数据表转换为JSON。 我可以得到它，但是问题是我正在序列化结果字符串中获取与表头相对应的属性名称：

private string TestForEach(DataTable table)
    {
        var categoryList = new List<FilterCountry>(table.Rows.Count);
        foreach (DataRow row in table.Rows)
        {
            var values = row.ItemArray;
            var category = new FilterCountry()
            {
                Country = values[0].ToString(),
                Count = (Int32)values[1]
            };
            categoryList.Add(category);
        }
        System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
        return serializer.Serialize(categoryList);
    }

这将返回一个字符串：

[{"Count":2,"Country":"China"},{"Count":3,"Country":"India"},{"Count":3,"Country":"Pakistan"},{"Count":5,"Country":"United Arab Emirates"}]

但我不需要字符串中的属性名称，我只需要：

"China":2,"India":3,"Pakistan":3,"United Arab Emirates":5

Answer 1

您需要实现和使用自定义JavaScriptConverter 。 在您的情况下，它可能看起来像这样：

public class FilterCountryListConverter : JavaScriptConverter
{
   public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
   {
       throw new NotImplementedException();
   }

   public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
   {
       var output = new Dictionary<string, object>();
       List<FilterCountry> filters = obj as List<FilterCountry>;
       filters.ForEach( f => output.Add( f.Country, f.Count ) );
       return output;
   }

   public override IEnumerable<Type> SupportedTypes
   {
       get { return new List<Type>(new List<Type>(new Type[] { typeof(List<FilterCountry>) }));  }
   }
}

然后，您需要在调用序列化例程之前在序列化器中注册它：

System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
serializer.RegisterConverters(new JavaScriptConverter[] { new FilterCountryListConverter() });
var res = serializer.Serialize(categoryList);

然后您将获得如下输出：

{"China":2,"India":2,"Pakistan":3,"United Arab Emirates":5}