C#中把Datatable转换为Json的5个代码实例
一、
/// <summary> /// Datatable转换为Json /// </summary> /// <param name="table">Datatable对象</param> /// <returns>Json字符串</returns> public static string ToJson(DataTable dt) { StringBuilder jsonString = new StringBuilder(); jsonString.Append("["); DataRowCollection drc = dt.Rows; for (int i = 0; i < drc.Count; i++) { jsonString.Append("{"); for (int j = 0; j < dt.Columns.Count; j++) { string strKey = dt.Columns[j].ColumnName; string strValue = drc[i][j].ToString(); Type type = dt.Columns[j].DataType; jsonString.Append("\"" + strKey + "\":"); strValue = StringFormat(strValue, type); if (j < dt.Columns.Count - 1) { jsonString.Append(strValue + ","); } else { jsonString.Append(strValue); } } jsonString.Append("},"); } jsonString.Remove(jsonString.Length - 1, 1); jsonString.Append("]"); return jsonString.ToString(); } /// <summary> /// 格式化字符型、日期型、布尔型 /// </summary> /// <param name="str"></param> /// <param name="type"></param> /// <returns></returns> private static string StringFormat(string str, Type type) { if (type == typeof(string)) { str = String2Json(str); str = "\"" + str + "\""; } else if (type == typeof(DateTime)) { str = "\"" + str + "\""; } else if (type == typeof(bool)) { str = str.ToLower(); } else if (type != typeof(string) && string.IsNullOrEmpty(str)) { str = "\"" + str + "\""; } return str; } /// <summary> /// 过滤特殊字符 /// </summary> /// <param name="s">字符串</param> /// <returns>json字符串</returns> private static string String2Json(String s) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < s.Length; i++) { char c = s.ToCharArray()[i]; switch (c) { case '\"': sb.Append("\\\""); break; case '\\': sb.Append("\\\\"); break; case '/': sb.Append("\\/"); break; case '\b': sb.Append("\\b"); break; case '\f': sb.Append("\\f"); break; case '\n': sb.Append("\\n"); break; case '\r': sb.Append("\\r"); break; case '\t': sb.Append("\\t"); break; default: sb.Append(c); break; } } return sb.ToString(); }
二、
public static string CreateJsonParameters(DataTable dt) { /**//**/ /**//* /**************************************************************************** * Without goingin to the depth of the functioning of this Method, i will try to give an overview * As soon as this method gets a DataTable it starts to convert it into JSON String, * it takes each row and in each row it grabs the cell name and its data. * This kind of JSON is very usefull when developer have to have Column name of the . * Values Can be Access on clien in this way. OBJ.HEAD[0].<ColumnName> * NOTE: One negative point. by this method user will not be able to call any cell by its index. * *************************************************************************/ StringBuilder JsonString = new StringBuilder(); //Exception Handling if (dt != null && dt.Rows.Count > 0) { JsonString.Append("{ "); JsonString.Append("\"T_blog\":[ "); for (int i = 0; i < dt.Rows.Count; i++) { JsonString.Append("{ "); for (int j = 0; j < dt.Columns.Count; j++) { if (j < dt.Columns.Count - 1) { JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\","); } else if (j == dt.Columns.Count - 1) { JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\""); } } /**//**/ /**//*end Of String*/ if (i == dt.Rows.Count - 1) { JsonString.Append("} "); } else { JsonString.Append("}, "); } } JsonString.Append("]}"); return JsonString.ToString(); } else { return null; } }
效果：
{"T_blog":
[
{"id":"14","title":"深圳市盈基实为有限公司","addtime":"2008-08-08"},
{"id":"15","title":"文立商行","addtime":"2008-09-12"},
{"id":"17","title":"邓事文","addtime":"2008-09-19"},
{"id":"21","title":"深圳地铁通了","addtime":"2008-09-25"}
]
}
三、
/// <summary> /// 将一个数据表转换成一个JSON字符串，在客户端可以直接转换成二维数组。 /// </summary> /// <param name="source">需要转换的表。</param> /// <returns></returns> public static string DataTableToJson(DataTable source) { if (source.Rows.Count == 0) return ""; StringBuilder sb = new StringBuilder("["); foreach (DataRow row in source.Rows) { sb.Append("["); for (int i = 0; i < source.Columns.Count; i++) { sb.Append('"' + row[i].ToString() + "\","); } sb.Remove(sb.Length - 1, 1); sb.Append("],"); } sb.Remove(sb.Length - 1, 1); sb.Append("]"); return sb.ToString(); } /// <summary> /// 反回JSON数据到前台 /// </summary> /// <param name="dt">数据表</param> /// <returns>JSON字符串</returns> public string CreateJsonParameters(DataTable dt) { StringBuilder JsonString = new StringBuilder(); //Exception Handling if (dt != null && dt.Rows.Count > 0) { JsonString.Append("{ "); JsonString.Append("\"TableInfo\":[ "); for (int i = 0; i < dt.Rows.Count; i++) { JsonString.Append("{ "); for (int j = 0; j < dt.Columns.Count; j++) { if (j < dt.Columns.Count - 1) { JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\","); } else if (j == dt.Columns.Count - 1) { JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\""); } } /**/ /*end Of String*/ if (i == dt.Rows.Count - 1) { JsonString.Append("} "); } else { JsonString.Append("}, "); } } JsonString.Append("]}"); return JsonString.ToString(); } else { return null; } }
四、
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(); } }
五、
#region DataTable 转换为Json字符串实例方法 /// <summary> /// GetClassTypeJosn 的摘要说明 /// </summary> public class GetClassTypeJosn : IHttpHandler { /// <summary> /// 文件名:DataTable 和Json 字符串互转 /// 版权所有:Copyright (C) Create Family Wealth liangjw /// 创建标示：2013-08-03 /// </summary> //用法说明实例 public void ProcessRequest(HttpContext context) { context.Response.ContentType = "application/json"; context.Response.Charset = "utf-8"; HttpRequest req = context.Request; string method = req["method"].ToStr().ToLower(); //获取合同明细列表 DataTable 转换为Json字符串 if (method == "txtdate") { string json = ""; BO.MakeContractMx bll = new MakeContractMx(); DataSet ds = bll.GetDataTable(); if (ds.Tables.Count > 0) { json =ToJson(ds.Tables[0]); } context.Response.Write(json); return; } } public bool IsReusable { get { return false; } } } #endregion #region Json字符串转换为DataTable 实例方法 public DataTable JsonToDataTable(json) { DataTable dt= ToDataTable(json); return dt; } #endregion #region DataTable 转换为Json 字符串 /// <summary> /// DataTable 对象 转换为Json 字符串 /// </summary> /// <param name="dt"></param> /// <returns></returns> public static string ToJson(this DataTable dt) { JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer(); javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值 ArrayList arrayList = new ArrayList(); foreach (DataRow dataRow in dt.Rows) { Dictionary<string, object> dictionary = new Dictionary<string, object>(); //实例化一个参数集合 foreach (DataColumn dataColumn in dt.Columns) { dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToStr()); } arrayList.Add(dictionary); //ArrayList集合中添加键值 } return javaScriptSerializer.Serialize(arrayList); //返回一个json字符串 } #endregion #region Json 字符串 转换为 DataTable数据集合 /// <summary> /// Json 字符串 转换为 DataTable数据集合 /// </summary> /// <param name="json"></param> /// <returns></returns> public static DataTable ToDataTable(this string json) { DataTable dataTable = new DataTable(); //实例化 DataTable result; try { JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer(); javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值 ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json); if (arrayList.Count > 0) { foreach (Dictionary<string, object> dictionary in arrayList) { if (dictionary.Keys.Count<string>() == 0) { result = dataTable; return result; } if (dataTable.Columns.Count == 0) { foreach (string current in dictionary.Keys) { dataTable.Columns.Add(current, dictionary[current].GetType()); } } DataRow dataRow = dataTable.NewRow(); foreach (string current in dictionary.Keys) { dataRow[current] = dictionary[current]; } dataTable.Rows.Add(dataRow); //循环添加行到DataTable中 } } } catch { } result = dataTable; return result; } #endregion #region 转换为string字符串类型 /// <summary> /// 转换为string字符串类型 /// </summary> /// <param name="s">获取需要转换的值</param> /// <param name="format">需要格式化的位数</param> /// <returns>返回一个新的字符串</returns> public static string ToStr(this object s, string format = "") { string result = ""; try { if (format == "") { result = s.ToString(); } else { result = string.Format("{0:" + format + "}", s); } } catch { } return result; } #endregion
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