DataTable轉為JSON資料格式代碼

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public class DataTableConvertJson
    {

        #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);
            jsonBuilder.Append("\":[");
            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

        /// <summary>
        /// Msdn
        /// </summary>
        /// <param name="jsonName"></param>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static string DataTableToJson(string jsonName, DataTable dt)
        {
            StringBuilder Json = new StringBuilder();
            Json.Append("{\"" + jsonName + "\":[");
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    Json.Append("{");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"");
                        if (j < dt.Columns.Count - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < dt.Rows.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }
    }

方法一：

public static string GetJSON(DataTable dt) {     StringBuilder sb = new StringBuilder();     sb.Append("{\"totalCount\":" + dt.Rows.Count + ",\"data\":");     sb.Append("[");     try    {         if (dt.Rows.Count > 0)         {            Hashtable ht = new Hashtable();            for (int i = 0; i < dt.Columns.Count; i++)            {                ht.Add(i, dt.Columns[i].ColumnName);            }            for (int i = 0; i < dt.Rows.Count; i++)            {                sb.Append("{");                for (int j = 0; j < dt.Columns.Count; j++)                {                    sb.Append(string.Format("\"{0}\":\"{1}\",",                    ht[j], dt.Rows[i][j].ToString()));                }                sb.Remove(sb.ToString().LastIndexOf(","), 1);                sb.Append("},");            }            sb.Remove(sb.ToString().LastIndexOf(","), 1);            ht.Clear();            ht = null;        }    }      catch (Exception ex)    {        throw new Exception(ex.Message);    }    finally    {         sb.Append("]}");    }    return sb.ToString();}

 

方法二：用Newtonsoft.Json.Net20.dll（點擊下載）
先添加 Newtonsoft.Json.Net20.dll 的引用

using System.Data;using System.IO;using Newtonsoft.Json; /// <summary>將DateTable轉為Json格式資料</summary>/// <param name="dt">要轉換的DataTable名稱</param>/// <param name="dtName">應該是轉換後的Key如用Json.dtName得到資料</param>/// <returns></returns>public static string DataTableToJSON(DataTable dt, string dtName){    StringBuilder sb = new StringBuilder();    StringWriter sw = new StringWriter(sb);     using (JsonWriter jw = new JsonTextWriter(sw))    {        JsonSerializer ser = new JsonSerializer();        jw.WriteStartObject();        jw.WritePropertyName(dtName);        jw.WriteStartArray();        foreach (DataRow dr in dt.Rows)        {            jw.WriteStartObject();             foreach (DataColumn dc in dt.Columns)            {                jw.WritePropertyName(dc.ColumnName);                ser.Serialize(jw, dr[dc].ToString());            }             jw.WriteEndObject();        }        jw.WriteEndArray();        jw.WriteEndObject();         sw.Close();        jw.Close();     }     return sb.ToString();}

DataTable轉為JSON資料格式代碼