winform excel导入--NPOI方式

项目中要用到excel导入数据，用NPOI方式做了一个demo，记录如下：

Form1代码：

 public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             OpenFileDialog f = new OpenFileDialog();
             f.Multiselect = true;
             f.ShowDialog();
             string[] filenames = f.FileNames;

             if (filenames.Length > )
             {
                 this.label1.Text = filenames[];
                 string strFile = System.IO.Path.GetFileName(filenames[]);
                 DataTable dt = GetDataBySQLNew("McsDW", "select 1 from [McsDW].[dbo].[UserGateWayNumber] where ExcelFileName='" + strFile + "'");
                 if (dt != null)
                 {
                     if (dt.Rows.Count > )
                     {
                         MessageBox.Show("数据库里已经导入名称为 " + strFile + " 的excel表，请核对！");
                         this.label1.Text = "";
                     }
                 }
             }
         }

         private void button2_Click(object sender, EventArgs e)
         {
             if (this.label1.Text.Length < )
             {
                 MessageBox.Show("请先选择excel文件！");
                 return;
             }
             string sheetIndex = texBoxSheet.Text;
             int sheetInt = ;
             int.TryParse(sheetIndex, out sheetInt);
             if (sheetInt < )
             {
                 MessageBox.Show("sheet序号请填写整数！");
                 return;
             }

             ReadFromExcelFile(this.label1.Text, sheetInt);
         }

         private DataSet ExcelToDS(string Path)
         {
             string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";
             OleDbConnection conn = new OleDbConnection(strConn);
             conn.Open();
             string strExcel = "";
             OleDbDataAdapter myCommand = null;
             DataSet ds = null;
             strExcel = "select * from [sheet1$]";
             myCommand = new OleDbDataAdapter(strExcel, strConn);
             ds = new DataSet();
             myCommand.Fill(ds, "table1");
             return ds;
         }

         private void TestExcelRead(string file)
         {
             try
             {
                 using (ExcelHelper excelHelper = new ExcelHelper(file))
                 {
                     DataTable dt = excelHelper.ExcelToDataTable("MySheet", true);
                     int SE  = dt.Rows.Count;
                     //PrintData(dt);
                 }
             }
             catch (Exception ex)
             {
                 Console.WriteLine("Exception: " + ex.Message);
             }
         }

         private void ReadFromExcelFile(string filePath, int sheetInt)
         {
             IWorkbook wk = null;
             string extension = System.IO.Path.GetExtension(filePath);
             try
             {
                 FileStream fs = File.OpenRead(filePath);
                 if (extension.Equals(".xls"))//xlsx    xls
                 {
                     //把xls文件中的数据写入wk中
                     wk = new HSSFWorkbook(fs);
                 }
                 else
                 {
                     //把xlsx文件中的数据写入wk中
                     wk = new XSSFWorkbook(fs);
                 }

                 fs.Close();
                 //读取当前表数据
                 string userCount = "";
                 Dictionary<string, List<string>> userDic = new Dictionary<string, List<string>>();
                 if (sheetInt > wk.NumberOfSheets)
                 {
                     MessageBox.Show("sheet序号填写超出范围！");
                     return;
                 }
                 //for (int k = 0; k < wk.NumberOfSheets; k++ )
                 //{

                 ISheet sheet = wk.GetSheetAt(sheetInt-);

                     IRow row = sheet.GetRow();  //读取当前行数据
                     //LastRowNum 是当前表的总行数-1（注意）
                     int offset = ;

                     for (int i = ; i <= sheet.LastRowNum; i++)
                     {
                         row = sheet.GetRow(i);  //读取当前行数据
                         if (row != null)
                         {
                             string uxuhao = "", udanwei = "", ubumen = "", ubianhao = "", uname = "", uAka = "", uBka = "", ukai = "";
                             //LastCellNum 是当前行的总列数
                             for (int j = ; j < row.LastCellNum; j++)
                             {
                                 //读取该行的第j列数据
                                 string value = row.GetCell(j) == null ? "" : row.GetCell(j).ToString();

                                 if (j == )
                                     uxuhao = value;
                                 else if (j == )
                                     udanwei = value;
                                 else if (j == )
                                     ubumen = value;
                                 else if (j == )
                                     ubianhao = value;
                                 else if (j == )
                                     uname = value;
                                 else if (j == )
                                     uAka = value;
                                 else if (j == )
                                     uBka = value;
                                 else if (j == )
                                 {
                                     ukai = value;
                                     if(uxuhao != null)
                                     {
                                         if (uxuhao.Contains("计数"))
                                         {
                                             ukai = row.GetCell(j).NumericCellValue.ToString();
                                         }
                                     }

                                 }

                             }
                             if (!(ubianhao.Equals("") || ubianhao.Equals("员工编号") || ubianhao.Contains("经办人")))
                             {
                                 List<string> ulist = new List<string>();
                                 ulist.Add(udanwei);
                                 ulist.Add(ubumen);
                                 ulist.Add(uname);
                                 ulist.Add(ukai);
                                 ulist.Add(uAka);
                                 ulist.Add(uBka);
                                 userDic.Add(ubianhao, ulist);
                                 //Console.WriteLine("\n");
                             }
                             if (uxuhao != null)
                             {
                                 if (uxuhao.Contains("计数"))
                                 {
                                     userCount = ukai;
                                     break;
                                 }
                                 int uxuhaoInt = ;
                                 int.TryParse(uxuhao, out uxuhaoInt);
                                 if (userDic.Count >  && uxuhaoInt == )
                                 {
                                     userCount = "没有计数";
                                     break;
                                 }
                             }
                         }
                     }
                 //}

                     DoUser(userDic, filePath, userCount, sheetInt);
             }

             catch (Exception e)
             {
                 //只在Debug模式下才输出
                 Console.WriteLine(e.Message);
                 MessageBox.Show(e.Message);
             }
         }

         private void DoUser(Dictionary<string, List<string>> userDic, string filePath, string userCount, int sheetInt)
         {
             if (userDic.Count < )
                 return;
             string namev = "";
             string tip = "";
             DataTable dtNew = new DataTable();
             try
             {
                 //
                 DataTable dt = GetDataBySQLNew("McsDW", "select * from UserViewAll_DW ");

                 dtNew.Columns.Add("员工编号", Type.GetType("System.String"));
                 dtNew.Columns.Add("姓名", Type.GetType("System.String"));
                 dtNew.Columns.Add("A卡", Type.GetType("System.String"));
                 dtNew.Columns.Add("B卡", Type.GetType("System.String"));
                 dtNew.Columns.Add("开通餐卡", Type.GetType("System.String"));
                 dtNew.Columns.Add("备注", Type.GetType("System.String"));

                 string sql = "", sqlabnull = "";
                 string remark = "";
                 int passCount = ;
                 DataTable dtNewABNull = dtNew.Clone();

                 foreach (var d in userDic)
                 {
                     //Console.Write(d.Key+"----"+d.Value);
                     //Console.WriteLine("\n");
                     //namev = d.Value;
                     remark = "";
                     bool isExcel = false;
                     DataRow[] rows = dt.Select("PostionLevel='" + d.Key + "'");
                     //if (d.Value[3].Trim().Equals("否"))
                     //    continue;
                     //开通餐卡为空，默认为不开通
                     if (d.Value[].Trim().Equals(""))
                     {
                         //Console.WriteLine(d.Key + "----" + d.Value + "----开通餐卡为空");
                         //isExcel = true;
                         //remark = "开通餐卡为空!";
                         continue;
                     }
                     //开通餐卡，填的不是A,B
                     if (!(d.Value[].Trim().ToUpper().Equals("A") || d.Value[].Trim().ToUpper().Equals("B")))
                     {
                         isExcel = true;
                         remark += "开通餐卡项填写错误，填的不是A,B";
                     }
                     //如果开通A卡但是A卡为空,B卡不为空，也提示
                     else if (d.Value[].Trim().ToUpper().Equals("A") && d.Value[].Trim().Equals("") && !d.Value[].Trim().Equals(""))
                     {
                         isExcel = true;
                         remark += "需要开通A卡但是A卡为空，B卡不为空，请填B卡";
                     }
                     //如果开通B卡但是B卡为空，A卡不为空，也提示
                     else if (d.Value[].Trim().ToUpper().Equals("B") && d.Value[].Trim().Equals("") && !d.Value[].Trim().Equals(""))
                     {
                         isExcel = true;
                         remark += "需要开通B卡但是B卡为空，A卡不为空，请填A卡";
                     }
                     else if (rows == null)
                     {
                         isExcel = true;
                         remark += "数据库为空";
                     }
                     else if (rows.Length < )
                     {
                         isExcel = true;
                         remark += "数据库找不到该用户";
                     }
                     else
                     {
                         //判断用户名，中文名字
                         if (!(d.Value[].Trim().Equals(rows[]["UserDisplayName"].ToString().Trim())))
                         {
                             isExcel = true;
                             remark += "数据库里该用户名不匹配:" + rows[]["UserDisplayName"].ToString();
                         }
                         //如果开通A卡，判断A卡和数据库是否匹配
                         if (d.Value[].Trim().ToUpper().Equals("A") && !(d.Value[].Trim().Equals(rows[]["GatewayNumber"].ToString().Trim())))
                         {
                             isExcel = true;
                             remark += "开通A卡,但数据库里该用户A卡不匹配:" + rows[]["GatewayNumber"].ToString();
                         }
                         //如果开通B卡，判断B卡和数据库是否匹配
                         if (d.Value[].Trim().ToUpper().Equals("B") && !(d.Value[].Trim().Equals(rows[]["GatewayNumber2"].ToString().Trim())))
                         {
                             isExcel = true;
                             remark += "开通B卡,但数据库里该用户B卡不匹配:" + rows[]["GatewayNumber2"].ToString();
                         }
                         //string kastr = GetKa(rows[0]["GatewayNumber2"], rows[0]["GatewayNumber"]);
                         //if (kastr.Equals("") || kastr.Equals("没有卡号"))
                         //{
                         //    isExcel = true;
                         //    remark += "数据库里该用户卡号有误:" + kastr;
                         //}
                     }

                     string Gender = GetGender(d.Key);
                     //如果A卡和B卡都为空，也提示
                     if (d.Value[].Trim().Equals("") && d.Value[].Trim().Equals(""))
                     {
                         string abnull = "A,B卡都为空，请尽快启动办卡流程";
                         dtNewABNull.Rows.Add(new object[] { d.Key, d.Value[], d.Value[], d.Value[], d.Value[], abnull });

                         sqlabnull += string.Format("  insert into UserGateWayNumberABNull(UnitName,DepartmentName,PostionLevel,UserName,GatewayNumber,ExcelFileName,AorBcard,Remark,Gender) values('{0}','{1}','{2}','{3}','{4}','{5}','{6}','{7}','{8}')",
                             d.Value[], d.Value[], d.Key, d.Value[], "", System.IO.Path.GetFileName(filePath), d.Value[], abnull, Gender);
                         passCount++;
                         continue;
                     }

                     if (isExcel)
                     {
                         DataRow r = dtNew.NewRow();
                         r["员工编号"] = d.Key;
                         r["姓名"] = d.Value[];
                         r["A卡"] = d.Value[];
                         r["B卡"] = d.Value[];
                         r["开通餐卡"] = d.Value[];
                         r["备注"] = remark;

                         dtNew.Rows.Add(r);
                     }
                     else
                     {
                         string gNum = "";
                         if (d.Value[].Trim().ToUpper().Equals("A"))
                             gNum = d.Value[];
                         else
                             gNum = d.Value[];

                         sql += string.Format("  insert into UserGateWayNumber(UnitName,DepartmentName,PostionLevel,UserName,GatewayNumber,ExcelFileName,AorBcard,Gender) values('{0}','{1}','{2}','{3}','{4}','{5}','{6}','{7}')",
                             d.Value[], d.Value[], d.Key, d.Value[], gNum, System.IO.Path.GetFileName(filePath), d.Value[], Gender);
                         passCount++;
                     }
                 }
                 //WriteToExcel(@"F:/web/设计院档案文档/用印不归档/员工卡号.xls");
                 int ucount =;
                 int.TryParse(userCount, out ucount);
                 if (dtNew.Rows.Count > )
                 {
                     //DataRow r = dtNew.NewRow();
                     //r["员工编号"] = filePath;
                     //r["姓名"] = "";
                     //r["A卡"] = "";
                     //r["B卡"] = "";
                     //r["开通餐卡"] = "";
                     //r["备注"] = "";

                     //dtNew.Rows.Add(r);
                     //加入AB都为空的用户
                     foreach(DataRow ro in dtNewABNull.Rows)
                     {
                         dtNew.Rows.Add(ro.ItemArray);
                     }
                     //加入excel名
                     dtNew.Rows.Add(new object[] { filePath, "", "", "", "", "" });

                     DataTableToExcel(dtNew);
                     tip = "总共处理了" + userDic.Count + "条数据，其中异常的有" + (dtNew.Rows.Count-).ToString() + "条。请查看D:/食堂餐卡统计.xls";
                 }
                 else if (ucount != passCount && !userCount.Equals("没有计数"))
                 {
                     tip = "总共处理了" + userDic.Count + "条数据，其中合格数据有" + passCount + "条， excel表中计数的有" + ucount + "条。数据不匹配，请核查！";
                 }
                 else
                 {
                     //GetDataBySQLNew("McsDW", sql + sqlabnull);
                     //tip = "总共处理了" + userDic.Count + "条数据，其中合格数据有" + (passCount - dtNewABNull.Rows.Count).ToString() + "条，数据已经录入到[McsDW].[dbo].[UserGateWayNumber]表中, AB卡都为空但是需要开通卡的用户数据有" + dtNewABNull.Rows.Count + "条，此数据录入到表UserGateWayNumberABNull";
                 }
             }
             catch(Exception e)
             {
                 MessageBox.Show(e.Message + "--" + namev);
             }

             Console.Write("总共"+userDic.Count);
             MessageBox.Show(tip);
         }

         private string GetGender(string pl)
         {
             string sql = "select Gender from [McsDW].[dbo].[UserViewAll_DW] where PostionLevel='" + pl + "'";
             DataTable dt = GetDataBySQLNew("McsDW", sql);
             if (dt == null || dt.Rows.Count < )
                 return "";
             return dt.Rows[][] == null ? "" : dt.Rows[][].ToString();
         }

         private string GetKa(object K2, object K1)
         {
             if (!(K2 == null || K2.Equals("")))
             {
                 return K2.ToString();
             }
             else if (!(K1 == null || K1.Equals("")))
             {
                 return K1.ToString();
             }
             else
                 return "没有卡号";
         }

         private void WriteToExcel(string filePath)
         {
             //创建工作薄
             IWorkbook wb;
             string extension = System.IO.Path.GetExtension(filePath);
             //根据指定的文件格式创建对应的类
             if (extension.Equals(".xls"))
             {
                 wb = new HSSFWorkbook();
             }
             else
             {
                 wb = new XSSFWorkbook();
             }

             ICellStyle style1 = wb.CreateCellStyle();//样式
             style1.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Left;//文字水平对齐方式
             style1.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
             //设置边框
             style1.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
             style1.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
             style1.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
             style1.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
             style1.WrapText = true;//自动换行

             ICellStyle style2 = wb.CreateCellStyle();//样式
             IFont font1 = wb.CreateFont();//字体
             font1.FontName = "楷体";
             font1.Color = HSSFColor.Red.Index;//字体颜色
             font1.Boldweight = (short)FontBoldWeight.Normal;//字体加粗样式
             style2.SetFont(font1);//样式里的字体设置具体的字体样式
             //设置背景色
             style2.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Yellow.Index;
             style2.FillPattern = FillPattern.SolidForeground;
             style2.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.Yellow.Index;
             style2.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Left;//文字水平对齐方式
             style2.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式

             ICellStyle dateStyle = wb.CreateCellStyle();//样式
             dateStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Left;//文字水平对齐方式
             dateStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
             //设置数据显示格式
             IDataFormat dataFormatCustom = wb.CreateDataFormat();
             dateStyle.DataFormat = dataFormatCustom.GetFormat("yyyy-MM-dd HH:mm:ss");

             //创建一个表单
             ISheet sheet = wb.CreateSheet("Sheet0");
             //设置列宽
             int[] columnWidth = { , , ,  };
             for (int i = ; i < columnWidth.Length; i++)
             {
                 //设置列宽度，256*字符数，因为单位是1/256个字符
                 sheet.SetColumnWidth(i,  * columnWidth[i]);
             }

             //测试数据
             int rowCount = , columnCount = ;
     //        object[,] data = {
     //    {"列0", "列1", "列2", "列3"},
     //    {"", 400, 5.2, 6.01},
     //    {"", true, "2014-07-02", DateTime.Now}
     //    //日期可以直接传字符串，NPOI会自动识别
     //    //如果是DateTime类型，则要设置CellStyle.DataFormat，否则会显示为数字
     //};
             object[,] data = {
                 {"列0", "列1", "列2", "列3"},
                 {"", , 5.2, 6.01}
             };

             IRow row;
             ICell cell;

             for (int i = ; i < rowCount; i++)
             {
                 row = sheet.CreateRow(i);//创建第i行
                 for (int j = ; j < columnCount; j++)
                 {
                     cell = row.CreateCell(j);//创建第j列
                     cell.CellStyle = j %  ==  ? style1 : style2;
                     //根据数据类型设置不同类型的cell
                     object obj = data[i, j];
                     SetCellValue(cell, data[i, j]);
                     //如果是日期，则设置日期显示的格式
                     if (obj.GetType() == typeof(DateTime))
                     {
                         cell.CellStyle = dateStyle;
                     }
                     //如果要根据内容自动调整列宽，需要先setCellValue再调用
                     //sheet.AutoSizeColumn(j);
                 }
             }

             //合并单元格，如果要合并的单元格中都有数据，只会保留左上角的
             //CellRangeAddress(0, 2, 0, 0)，合并0-2行，0-0列的单元格
             CellRangeAddress region = new CellRangeAddress(, , , );
             sheet.AddMergedRegion(region);

             try
             {
                 FileStream fs = File.OpenWrite(filePath);
                 wb.Write(fs);//向打开的这个Excel文件中写入表单并保存。
                 fs.Close();
             }
             catch (Exception e)
             {
                 Console.WriteLine(e.Message);
             }
         }
         private void SetCellValue(ICell cell, object obj)
         {
             if (obj.GetType() == typeof(int))
             {
                 cell.SetCellValue((int)obj);
             }
             else if (obj.GetType() == typeof(double))
             {
                 cell.SetCellValue((double)obj);
             }
             else if (obj.GetType() == typeof(IRichTextString))
             {
                 cell.SetCellValue((IRichTextString)obj);
             }
             else if (obj.GetType() == typeof(string))
             {
                 cell.SetCellValue(obj.ToString());
             }
             else if (obj.GetType() == typeof(DateTime))
             {
                 cell.SetCellValue((DateTime)obj);
             }
             else if (obj.GetType() == typeof(bool))
             {
                 cell.SetCellValue((bool)obj);
             }
             else
             {
                 cell.SetCellValue(obj.ToString());
             }
         }

         private bool DataTableToExcel(DataTable dt)
         {
             bool result = false;
             IWorkbook workbook = null;
             FileStream fs = null;
             IRow row = null;
             ISheet sheet = null;
             ICell cell = null;
             try
             {
                 if (dt != null && dt.Rows.Count > )
                 {
                     workbook = new HSSFWorkbook();
                     sheet = workbook.CreateSheet("Sheet0");//创建一个名称为Sheet0的表
                     int rowCount = dt.Rows.Count;//行数
                     int columnCount = dt.Columns.Count;//列数

                     //设置列头
                     row = sheet.CreateRow();//excel第一行设为列头
                     for (int c = ; c < columnCount; c++)
                     {
                         cell = row.CreateCell(c);
                         cell.SetCellValue(dt.Columns[c].ColumnName);
                     }

                     //设置每行每列的单元格,
                     for (int i = ; i < rowCount; i++)
                     {
                         row = sheet.CreateRow(i + );
                         for (int j = ; j < columnCount; j++)
                         {
                             cell = row.CreateCell(j);//excel第二行开始写入数据
                             cell.SetCellValue(dt.Rows[i][j].ToString());
                         }
                     }
                     using (fs = File.OpenWrite(@"D:/食堂餐卡统计.xls"))
                     {
                         workbook.Write(fs);//向打开的这个xls文件中写入数据
                         result = true;
                     }
                 }
                 return result;
             }
             catch (Exception ex)
             {
                 if (fs != null)
                 {
                     fs.Close();
                 }
                 return false;
             }
         }

         private DataTable GetDataBySQLNew(string database, string sql)
         {
             DataTable dt = new DataTable();
             string strServer = "Server=127.0.0.0; DataBase=McsDW; user id=sqluser; password=Pass@word123;";
             if (database.Equals("McsDW"))
             {
                 strServer = "Server=127.0.0.0; DataBase=McsDW; user id=sqluser; password=Pass@word123;";
             }
             else if (database.Equals("McsSP"))
             {
                 strServer = "Server=127.0.0.0; DataBase=McsSP; user id=sqluser; password=Pass@word123;";
             }
             using (System.Data.SqlClient.SqlConnection SqlCnn = new System.Data.SqlClient.SqlConnection(strServer))
             {
                 SqlCnn.Open();
                 System.Data.SqlClient.SqlDataAdapter SqlDa = new System.Data.SqlClient.SqlDataAdapter(sql, SqlCnn);
                 DataSet DS = new DataSet();
                 SqlDa.Fill(DS);
                 SqlDa.Dispose();
                 SqlCnn.Close();
                 if (DS == null || DS.Tables == null || DS.Tables.Count < )
                     return null;
                 dt = DS.Tables[];
             }
             return dt;
         }

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