C# 将datatable 转换json

        public static string DataTableToJson(DataTable dt)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("{\"");
            //jsonBuilder.Append(dt.TableName);
            jsonBuilder.Append("data");
            jsonBuilder.Append("\":[");
            for (int i = ; i < dt.Rows.Count; i++)
            {
                jsonBuilder.Append("{");
                for (int j = ; j < dt.Columns.Count; j++)
                {
                    jsonBuilder.Append("\"");
                    jsonBuilder.Append(dt.Columns[j].ColumnName);
                    jsonBuilder.Append("\":\"");
                    jsonBuilder.Append(dt.Rows[i][j].ToString());
                    jsonBuilder.Append("\",");
                }
                jsonBuilder.Remove(jsonBuilder.Length - , );
                jsonBuilder.Append("},");
            }
            jsonBuilder.Remove(jsonBuilder.Length - , );
            jsonBuilder.Append("]}");
            return jsonBuilder.ToString();
        }