C#Json转DataTable

需求：有一个log文件，需要整理成Excel，日志文件里面的数据都是json字符串

思路是，把Json字符串转换成DataTable，然后导出到Excel

在网上找了一些资料，整理了以下三种类型的Json

一、Json转换DataTable

1.处理简单Json：

[{"mac":"20:f1:7c:c5:cd:80","rssi":"-86","ch":""},{"mac":"20:f1:7c:c5:cd:85","rssi":"-91","ch":""}]

        /// <summary>
        /// Json 字符串 转换为 DataTable数据集合
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static DataTable ToDataTableTwo(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 > )
                {
                    foreach (Dictionary<string, object> dictionary in arrayList)
                    {
                        if (dictionary.Keys.Count<string>() == )
                        {
                            result = dataTable;
                            return result;
                        }
                        //Columns
                        if (dataTable.Columns.Count == )
                        {
                            foreach (string current in dictionary.Keys)
                            {
                                dataTable.Columns.Add(current, dictionary[current].GetType());
                            }
                        }
                        //Rows
                        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;
        }

2.处理复杂Json

[{"id":"00e58d51","data":[{"mac":"20:f1:7c:c5:cd:80","rssi":"-86","ch":""},{"mac":"20:f1:7c:c5:cd:85","rssi":"-91","ch":""}]},
{"id":"00e58d53","data":[{"mac":"bc:d1:77:8e:26:78","rssi":"-94","ch":""},{"mac":"14:d1:1f:3e:bb:ac","rssi":"-76","ch":""},{"mac":"20:f1:7c:d4:05:41","rssi":"-86","ch":""}]}]

        /// <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 > )
                {
                    foreach (Dictionary<string, object> dictionary in arrayList)
                    {
                        if (dictionary.Keys.Count<string>() == )
                        {
                            result = dataTable;
                            return result;
                        }
                        //Columns
                        if (dataTable.Columns.Count == )
                        {
                            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;
        }

3.处理不规则Json，因为列并不确定，所以直接定义列，不动态生成

[{"id":"00e58d53","data":[{"mac":"34:b3:54:89:86:64","rssi":"-86","ch":""},{"mac":"50:bd:5f:02:80:44","rssi":"-90","ch":""}]},
{"id":"00ccda81","data":[{"mac":"bc:46:99:4e:96:c8","rssi":"-92","ch":""},{"mac":"bc:3a:ea:fc:77:6c","rssi":"-93","ch":"","ds":"Y","essid":"vienna hotel WIFI"}]}]

       /// <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 > )
                {
                    foreach (Dictionary<string, object> dictionary in arrayList)
                    {
                        if (dictionary.Keys.Count<string>() == )
                        {
                            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;
        }

二、导出Excel

        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <param name="table"></param>
        /// <param name="file"></param>
        public void dataTableToCsv(DataTable table, string file)
        {
            string title = "";
            FileStream fs = new FileStream(file, FileMode.OpenOrCreate);
            StreamWriter sw = new StreamWriter(new BufferedStream(fs), System.Text.Encoding.Default);
            for (int i = ; i < table.Columns.Count; i++)
            {
                title += table.Columns[i].ColumnName + "\t"; //栏位：自动跳到下一单元格
            }
            title = title.Substring(, title.Length - ) + "\n";
            sw.Write(title);
            foreach (DataRow row in table.Rows)
            {
                string line = "";
                for (int i = ; i < table.Columns.Count; i++)
                {
                    line += row[i].ToString().Trim() + "\t"; //内容：自动跳到下一单元格
                }
                line = line.Substring(, line.Length - ) + "\n";
                sw.Write(line);
            }
            sw.Close();
            fs.Close();
        }

三、调用实现，数据导出到Excel

        protected void Button1_Click(object sender, EventArgs e)
        {
            string str = File.ReadAllText(@"C:\Users\Admin\Desktop\json.txt");
            DataTable dt = ToDataTable(str);
            this.dataTableToCsv(dt, @"E:\json.xls"); //调用函数
        }