private string DataTableToJson(DataTable dt) {string Json = "";Json = Json + "[";foreach (DataRow dr in dt.Rows) {Json = Json + "{";foreach (DataColumn dc in dt.Columns) {Json = Json + "\"" + dc.ColumnName + "\":\"" + dr[dc].ToString() + "\""+",";}Json = Json.Substring(0, Json.Length - 1);Json = Json + "},";}Json = Json.Substring(0, Json.Length - 1);Json = Json + "]";return Json;}

　正好有项目需要用，就写出来了，备忘把。