C#中把Json数据转为DataTable

Yelena ·

更新时间:2024-11-10

· 23 次阅读

简单

        /// <summary>
        /// 将json转换为DataTable
        /// </summary>
        /// <param name="strJson">得到的json</param>
        /// <returns></returns>
        public static DataTable JsonToDT(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;
        }

处理不规则

        /// <summary>
        /// Json 字符串 转换为 DataTable数据集合
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static DataTable ToDataTable(string json)
        {
            DataTable dataTable = new DataTable();  //实例化
            DataTable result;
            try
            {
                dataTable.Columns.Add("id");
                dataTable.Columns.Add("mac");
                dataTable.Columns.Add("rssi");
                dataTable.Columns.Add("ch");
                dataTable.Columns.Add("ts");
                dataTable.Columns.Add("tmc");
                dataTable.Columns.Add("tc");
                dataTable.Columns.Add("ds");
                dataTable.Columns.Add("essid");
                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;
                        }//Rows
                        string root = "";
                        foreach (string current in dictionary.Keys)
                        {
                            if (current != "data")
                                root = current;
                            else
                            {
                                ArrayList list = dictionary[current] as ArrayList;
                                foreach (Dictionary<string, object> dic in list)
                                {
                                    DataRow dataRow = dataTable.NewRow();
                                    dataRow[root] = dictionary[root];
                                    foreach (string key in dic.Keys)
                                    {
                                        dataRow[key] = dic[key];
                                    }
                                    dataTable.Rows.Add(dataRow);
                                }
                            }
                        }
                    }
                }
            }
            catch
            {
            }
            result = dataTable;
            return result;
        }

处理复杂

        /// <summary>
        /// Json 字符串 转换为 DataTable数据集合
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static DataTable ToDataTable(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;
                        }
                        //Columns
                        if (dataTable.Columns.Count == 0)
                        {
                            foreach (string current in dictionary.Keys)
                            {
                                if (current != "data")
                                    dataTable.Columns.Add(current, dictionary[current].GetType());
                                else
                                {
                                    ArrayList list = dictionary[current] as ArrayList;
                                    foreach (Dictionary<string, object> dic in list)
                                    {
                                        foreach (string key in dic.Keys)
                                        {
                                            dataTable.Columns.Add(key, dic[key].GetType());
                                        }
                                        break;
                                    }
                                }
                            }
                        }
                        //Rows
                        string root = "";
                        foreach (string current in dictionary.Keys)
                        {
                            if (current != "data")
                                root = current;
                            else
                            {
                                ArrayList list = dictionary[current] as ArrayList;
                                foreach (Dictionary<string, object> dic in list)
                                {
                                    DataRow dataRow = dataTable.NewRow();
                                    dataRow[root] = dictionary[root];
                                    foreach (string key in dic.Keys)
                                    {
                                        dataRow[key] = dic[key];
                                    }
                                    dataTable.Rows.Add(dataRow);
                                }
                            }
                        }
                    }
                }
            }
            catch
            {
            }
            result = dataTable;
            return result;
        }

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json数据 JSON C# datatable

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