DataTable转为JSON数据格式代码

浏览数：37 / 时间：2015年06月09日

public class DataTableConvertJson
    {

        #region dataTable转换成Json格式
        /// <summary>  
        /// dataTable转换成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转换成Json格式
        #region DataSet转换成Json格式
        /// <summary>  
        /// DataSet转换成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（点击下载）
先添加 Newtonsoft.Json.Net20.dll 的引用

using System.Data;
using System.IO;
using Newtonsoft.Json;
 
/// <summary>将DateTable转为Json格式数据</summary>
/// <param name="dt">要转换的DataTable名称</param>
/// <param name="dtName">应该是转换后的Key如用Json.dtName得到数据</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();
}
 