文章标题C#实现json与dt、array的转换

xiaoxiao2021-02-28  13

/// <summary> /// datatable转化为JSON /// </summary> /// <param name="dt"></param> /// <returns></returns> public string DataTableJson(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(); } /// <summary> /// list集合转化为JSON /// </summary> /// <param name="str"></param> /// <returns></returns> public string toJson(List<string> str) { StringBuilder json = new StringBuilder(); if (str == null) { return "null"; } json.Append("["); foreach (var item in str) { json.Append("{\"Name\":\""); json.Append(item); json.Append("\"},"); } return json.ToString().Substring(0, json.ToString().LastIndexOf(",")) + "]"; } /// <summary> /// 将二维数组转化为json /// </summary> private void arrayToJson(string[,] array) { StringBuilder Json=new StringBuilder(); int num = 0; string temp = ""; Json.Append("[{"); for (int i = 0; i < 3;i++ ) { num = i; temp = turnToJson(array[i, 0], array[i, 1]); Json.Append( temp ); if (i != 2) Json.Append(","); } Json.Append("}]"); }

/// ///将传入的两个字符串转换为json中键值对的形式 /// private string turnToJson(string str1,string str2) { string json = “”; json+=”\”“; json += str1 + “\”:\”“; json += str2 + “\”“; return json; }

/// <summary> /// json转为datatable /// </summary> /// <param name="strJson"></param> /// <returns></returns> private DataTable JsonToDataTable(string strJson) { //转换json格式 strJson = strJson.Replace(",\"", "*\"").Replace("\":", "\"#").ToString(); //取出表名 var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase); string strName = rg.Match(strJson).Value; DataTable tb = null; //去除表名 strJson = strJson.Substring(strJson.IndexOf("[") + 1); strJson = strJson.Substring(0, strJson.IndexOf("]")); //获取数据 rg = new Regex(@"(?<={)[^}]+(?=})"); MatchCollection mc = rg.Matches(strJson); for (int i = 0; i < mc.Count; i++) { string strRow = mc[i].Value; string[] strRows = strRow.Split('*'); //创建表 if (tb == null) { tb = new DataTable(); tb.TableName = strName; foreach (string str in strRows) { var dc = new DataColumn(); string[] strCell = str.Split('#'); if (strCell[0].Substring(0, 1) == "\"") { int a = strCell[0].Length; dc.ColumnName = strCell[0].Substring(1, a - 2); } else { dc.ColumnName = strCell[0]; } tb.Columns.Add(dc); } tb.AcceptChanges(); } //增加内容 DataRow dr = tb.NewRow(); for (int r = 0; r < strRows.Length; r++) { dr[r] = strRows[r].Split('#')[1].Trim().Replace(",", ",").Replace(":", ":").Replace("\"", ""); } tb.Rows.Add(dr); tb.AcceptChanges(); } return tb; }
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