本文实例讲述了C#实现Json转DataTable并导出Excel的方法。分享给大家供大家参考，具体如下：

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":"9"},{"mac":"20:f1:7c:c5:cd:85","rssi":"-91","ch":"9"}]

/// <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 > 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) { 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":"9"},{"mac":"20:f1:7c:c5:cd:85","rssi":"-91","ch":"9"}]},
{"id":"00e58d53","data":[{"mac":"bc:d1:77:8e:26:78","rssi":"-94","ch":"11"},{"mac":"14:d1:1f:3e:bb:ac","rssi":"-76","ch":"11"},{"mac":"20:f1:7c:d4:05:41","rssi":"-86","ch":"12"}]}]

/// <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;}

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":"13"},{"mac":"50:bd:5f:02:80:44","rssi":"-90","ch":"1"}]},
{"id":"00ccda81","data":[{"mac":"bc:46:99:4e:96:c8","rssi":"-92","ch":"1"},{"mac":"bc:3a:ea:fc:77:6c","rssi":"-93","ch":"6","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 > 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;}

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 = 0; 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(0, title.Length - 1) + "\n"; sw.Write(title); foreach (DataRow row in table.Rows) { string line = ""; for (int i = 0; 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(0, line.Length - 1) + "\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}

PS：关于json操作，这里再为大家推荐几款比较实用的json在线工具供大家参考使用：

在线JSON代码检验、检验、美化、格式化工具：
http://tools.jb51.net/code/json

JSON在线格式化工具：
http://tools.jb51.net/code/jsonformat

在线XML/JSON互相转换工具：
http://tools.jb51.net/code/xmljson

json代码在线格式化/美化/压缩/编辑/转换工具：
http://tools.jb51.net/code/jsoncodeformat

在线json压缩/转义工具：
http://tools.jb51.net/code/json_yasuo_trans

更多关于C#相关内容还可查看本站专题：《C#字符串操作技巧总结》、《C#常见控件用法教程》、《WinForm控件用法总结》、《C#程序设计之线程使用技巧总结》、《C#中XML文件操作技巧汇总》、《C#数据结构与算法教程》、《C#数组操作技巧总结》及《C#面向对象程序设计入门教程》

希望本文所述对大家C#程序设计有所帮助。