kejie

JsonToExcel:

 1   public static void JsonToExcel(List<Dictionary<string, object>> json, string fileName)
 2         {
 3             using (MemoryStream ms = new MemoryStream())
 4             {
 5 
 6                 IWorkbook workbook = null;
 7 
 8                 if (fileName.IndexOf(".xlsx") > 0)
 9                     workbook = new XSSFWorkbook();
10                 if (fileName.IndexOf(".xls") > 0)
11                     workbook = new HSSFWorkbook();
12                 ISheet sheet = workbook.CreateSheet();
13                 IRow headerRow = sheet.CreateRow(0);
14 
15                 //// handling header.  
16                 //foreach (DataColumn column in table.Columns)
17                 //    headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value  
18 
19 
20                 var keys = json.FirstOrDefault().Keys.ToList();
21                 for (var i = 0; i < keys.Count(); i++)
22                 {
23                     headerRow.CreateCell(i).SetCellValue(keys[i]);
24                 }
25 
26                 // handling value.  
27                 int rowIndex = 1;
28                 
29                 for (var i = 0; i < json.Count(); i++)
30                 {
31                     IRow dataRow = sheet.CreateRow(rowIndex);
32 
33                     var values=json[i].Values.ToList();
34                     for (var j = 0; j <values.Count();j++)
35                     {
36                         dataRow.CreateCell(j).SetCellValue(values[j].ToString());
37                     }
38 
39                     rowIndex++;
40                 }
41 
42                 workbook.Write(ms);
43                 ms.Flush();
44 
45                 using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
46                 {
47                     byte[] data = ms.ToArray();
48 
49                     fs.Write(data, 0, data.Length);
50                     fs.Flush();
51 
52                     data = null;
53                 }
54             }
55         }

 

 

 

 

DataTableToExcel:

 1  public static void dataTableToExcel(DataTable table, string fileName)
 2         {
 3             using (MemoryStream ms = new MemoryStream())
 4             {
 5 
 6                 IWorkbook workbook = null;
 7 
 8                 if (fileName.IndexOf(".xlsx") > 0)
 9                     workbook = new XSSFWorkbook();
10                 if (fileName.IndexOf(".xls") > 0)
11                     workbook = new HSSFWorkbook();
12                 ISheet sheet = workbook.CreateSheet();
13                 IRow headerRow = sheet.CreateRow(0);
14 
15                 // handling header.  
16                 foreach (DataColumn column in table.Columns)
17                     headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value  
18 
19                 // handling value.  
20                 int rowIndex = 1;
21 
22                 foreach (DataRow row in table.Rows)
23                 {
24                     IRow dataRow = sheet.CreateRow(rowIndex);
25 
26                     foreach (DataColumn column in table.Columns)
27                     {
28                         dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
29                     }
30 
31                     rowIndex++;
32                 }
33 
34                 workbook.Write(ms);
35                 ms.Flush();
36 
37                 using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
38                 {
39                     byte[] data = ms.ToArray();
40 
41                     fs.Write(data, 0, data.Length);
42                     fs.Flush();
43 
44                     data = null;
45                 }
46             }
47         }

ExcelToDataTable:


 /// <summary>
        /// 将excel中的数据导入到DataTable中
        /// </summary>
        /// <param name="sheetName">excel工作薄sheet的名称</param>
        /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
        /// <returns>返回的DataTable</returns>
        public static DataTable ExcelToDataTable(string filePath, bool isColumnName, int sheetName)
        {
            DataTable dataTable = null;
            FileStream fs = null;
            DataColumn column = null;
            DataRow dataRow = null;
            IWorkbook workbook = null;
            ISheet sheet = null;
            IRow row = null;
            ICell cell = null;
            int startRow = 0;
            try
            {
                using (fs = File.OpenRead(filePath))
                {
                    // 2007版本
                    if (filePath.IndexOf(".xlsx") > 0)
                        workbook = new XSSFWorkbook(fs);
                    // 2003版本
                    else if (filePath.IndexOf(".xls") > 0)
                        workbook = new HSSFWorkbook(fs);

                    if (workbook != null)
                    {
                        sheet = workbook.GetSheetAt(sheetName);//读取第一个sheet,当然也可以循环读取每个sheet
                        dataTable = new DataTable();
                        if (sheet != null)
                        {
                            int rowCount = sheet.LastRowNum;//总行数
                            if (rowCount > 0)
                            {
                                IRow firstRow = sheet.GetRow(0);//第一行
                                int cellCount = firstRow.LastCellNum;//列数

                                //构建datatable的列
                                if (isColumnName)
                                {
                                    startRow = 1;//如果第一行是列名,则从第二行开始读取
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        cell = firstRow.GetCell(i);
                                        if (cell != null)
                                        {
                                            if (cell.StringCellValue != null)
                                            {
                                                column = new DataColumn(cell.StringCellValue);
                                                dataTable.Columns.Add(column);
                                            }
                                        }
                                    }
                                }
                                else
                                {
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        column = new DataColumn("column" + (i + 1));
                                        dataTable.Columns.Add(column);
                                    }
                                }

                                //填充行
                                for (int i = startRow; i <= rowCount; ++i)
                                {
                                    row = sheet.GetRow(i);
                                    if (row == null) continue;
                                    dataRow = dataTable.NewRow();
                                    for (int j = row.FirstCellNum; j < cellCount; ++j)
                                    {
                                        cell = row.GetCell(j);
                                        if (cell == null)
                                        {
                                            dataRow[j] = "";
                                        }
                                        else
                                        {
                                            //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
                                            switch (cell.CellType)
                                            {
                                                case CellType.Blank:
                                                    dataRow[j] = "";
                                                    break;
                                                case CellType.Numeric:
                                                    short format = cell.CellStyle.DataFormat;
                                                    //对时间格式(2015.12.5、2015/12/5、2015-12-5等)的处理
                                                    if (format == 14 || format == 31 || format == 57 || format == 58)
                                                        dataRow[j] = cell.DateCellValue;
                                                    else
                                                        dataRow[j] = cell.NumericCellValue;
                                                    break;
                                                case CellType.String:
                                                    dataRow[j] = cell.StringCellValue;
                                                    break;
                                            }
                                        }
                                    }
                                    dataTable.Rows.Add(dataRow);
                                }
                            }
                        }
                    }
                }
                return dataTable;
            }
            catch (Exception ex)
            {
                Console.WriteLine("exception:" + ex.ToString());
                Console.ReadLine();
                if (fs != null)
                {
                    fs.Close();
                }
                return null;
            }
        }

 


 

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