asp.net DataTable和Dataset序列化成Json格式(2)

DatasetToJson：

public class DataSetConverter : JsonConverter 
{ 
    public override bool CanConvert(Type objectType) 
    { 
        return typeof(DataSet).IsAssignableFrom(objectType); 
    } 
 
    public override void WriteJson(JsonWriter writer, object value) 
    { 
        DataSet ds = (DataSet)value; 
        writer.WriteStartObject(); 
        foreach (DataTable dt in ds.Tables) 
        { 
            writer.WritePropertyName(dt.TableName); 
            writer.WriteStartArray(); 
            foreach (DataRow dr in dt.Rows) 
            { 
                writer.WriteStartObject(); 
                foreach (DataColumn dc in dt.Columns) 
                { 
                    writer.WritePropertyName(dc.ColumnName); 
                    writer.WriteValue(dr[dc].ToString()); 
                } 
                writer.WriteEndObject(); 
            } 
            writer.WriteEndArray(); 
        } 
        writer.WriteEndObject(); 
    } 
} 
调用的话：JavaScriptConvert.SerializeObject(GetTestDataSet(), new DataSetConverter());

DataTableToJson2：

public class DataTableConverter : JsonConverter 
    { 
        public override void WriteJson(JsonWriter writer, object value)