通過AJAX非同步減少網路內容傳輸，而JSON則可以把傳輸內容縮減到純資料；然後利用jQuery內建的AJAX功能直接獲得JSON格式的資料；在客戶端直接繫結到資料控制元件裡面，從而達到最優。

#region dataTable轉換成Json格式  
/// <summary>  
/// dataTable轉換成Json格式  
/// </summary>  
/// <param name="dt"></param>  
/// <returns></returns>  
public static string DataTable2Json(DataTable dt)  
{  
    StringBuilder jsonBuilder = new StringBuilder();  
    jsonBuilder.Append("{\"");  
    jsonBuilder.Append(dt.TableName.ToString());  
    jsonBuilder.Append("\":[");  
    for (int i = 0; i < dt.Rows.Count; i++)  
    {  
        jsonBuilder.Append("{");  
        for (int j = 0; 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 - 1, 1);  
        jsonBuilder.Append("},");  
    }  
    jsonBuilder.Remove(jsonBuilder.Length - 1, 1);  
    jsonBuilder.Append("]");  
    jsonBuilder.Append("}");  
    return jsonBuilder.ToString();  
}  
 
#endregion dataTable轉換成Json格式  
 
#region DataSet轉換成Json格式  
/// <summary>  
/// DataSet轉換成Json格式  
/// </summary>  
/// <param name="ds">DataSet</param>  
/// <returns></returns>  
public static string Dataset2Json(DataSet ds)  
{  
    StringBuilder json = new StringBuilder();  
      
    foreach (DataTable dt in ds.Tables)  
    {  
        json.Append("{\"");  
        json.Append(dt.TableName);  
        json.Append("\":");  
        json.Append(DataTable2Json(dt));  
        json.Append("}");  
    }  
    return json.ToString();  
}  
#endregion 
 

今天又發現了有更好的轉換方法，具體如下 ：

 public class ConventDataTableToJson

    {

          /// <summary>

           /// 序列化方法（帶分頁）
           /// </summary>

           /// <param name="dt"></param>

          /// <returns></returns>
        public static string Serialize(DataTable dt)

        {

            List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

            foreach (DataRow dr in dt.Rows)

            {

                Dictionary<string, object> result = new Dictionary<string, object>();

                foreach (DataColumn dc in dt.Columns)

                {

                    result.Add(dc.ColumnName, dr[dc].ToString());

                }

                list.Add(result);

            }

            int count = 0;

            try

            {

                count = Convert.ToInt32(dt.TableName);

            }

            catch (System.Exception ex)

            {

                count = dt.Rows.Count;

            }

            string strReturn = "";

            if (count == 0)

            {

                strReturn = "{\"totalCount\":0,\"data\":[]}";

            }

            else

            {

                strReturn = ConventToJson(list, count);

            }

            return strReturn;

        }

 

        /// <summary>

        /// 轉換為JSON物件
        /// </summary>

        /// <returns></returns>

        public static string ConventToJson<T>(List<T> list, int count)

        {

            JavaScriptSerializer serializer = new JavaScriptSerializer();

            string strJson = serializer.Serialize(list);

            strJson = strJson.Substring(1);

            strJson = strJson.Insert(0, "{totalCount:" + count + ",data:[");

            strJson += "}";

 

            return strJson;

        }

 

        /// <summary>

        /// 不需要分頁
        /// </summary>

        /// <param name="dt"></param>

        /// <param name="flag">false</param>

        /// <returns></returns>

        public static string Serialize(DataTable dt,bool flag)

        {

            JavaScriptSerializer serializer = new JavaScriptSerializer();

            List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

            foreach (DataRow dr in dt.Rows)

            {

                Dictionary<string, object> result = new Dictionary<string, object>();

                foreach (DataColumn dc in dt.Columns)

                {

                    result.Add(dc.ColumnName, dr[dc].ToString());

                }

                list.Add(result);

            }

            return serializer.Serialize(list); ;

        }

}