C#DataTable導出Excel，並實現合並單元格

asp.net webwofrm后台代碼----------建議Framework4.0及以上，3.5試過出現好多莫名錯誤...

首先導入兩個程序集。我的是 office2003，引用的COM里面的 Microsoft.office.Interop.Excel 14.0   和 程序集里的Microsoft Excel 12.0 Object Library。有多個版本，根據自己的office版本選擇。

添加之后引用里力會出現兩個DLL Microsoft.office.Core 和Microsoft.office.Interop.Excel

生成一下項目，如果出現  Excel.ApplicationClass()無法互嵌套操作類型 請改用適用的接口 

把引用的Microsoft.Office.Interop.Excel 右擊屬性 嵌入互操作類型改為false即可

 

        DataTable dt = new DataTable();
        DataColumn dc1 = new DataColumn();
        dc1.ColumnName = "name";
        dc1.DataType = typeof(string);
        DataColumn dc2 = new DataColumn();
        dc2.ColumnName = "age";
        dc2.DataType = typeof(int);
        dt.Columns.Add(dc1);
        dt.Columns.Add(dc2);
        for (int i = 0; i < 1000; i++)
        {
            DataRow dr = dt.NewRow();
            dr[0] = "茂茂" + i + "號";
            dr[1] = i;
            dt.Rows.Add(dr);
        }
        new Class1().DataTabletoExcel(dt, DateTime.Now.Ticks+".xlsx");

先造些數據，然后將datatable和要導出文件名傳遞給方法。

DataTabletoExcel 方法體，一般的DataTable可以直接導出。比較復雜的結構需要自己定義

      /// ///不要圖省勁省略了System.Data。Microsoft.office.Interop.DataTable 和System.Data.DataTable 會產生歧義
        public  void DataTabletoExcel(System.Data.DataTable tmpDataTable, string strFileName)
        {

            ///先得到datatable的行數
            int rowNum = tmpDataTable.Rows.Count;
            ///列數
            int columnNum = tmpDataTable.Columns.Count;
            ///聲明一個應用程序類實例
            Application xlApp = new ApplicationClass();

            //xlApp.DefaultFilePath = "";  ///默認文件路徑，將其設置路徑后發現沒什么變化。導出excel的路徑還是在參數strFileName里設置
            //xlApp.DisplayAlerts = true;
            //xlApp.SheetsInNewWorkbook = 1;///返回或設置 Microsoft Excel 自動插入到新工作簿中的工作表數目。Long 類型，可讀寫。設置為2之后沒發現什么區別
            //創建一個新工作簿
            Workbook xlBook = xlApp.Workbooks.Add();
            ///在工作簿中得到sheet。
            _Worksheet oSheet = (_Worksheet)xlBook.Worksheets[1];
            #region 繪制列
            ///自定義方法，想sheet中繪制列
            RangeBuild(oSheet, "A1", "A2", "編號");
            RangeBuild(oSheet, "B1", "B2", "畜主");
            RangeBuild(oSheet, "C1", "C2", "地址");
            RangeBuild(oSheet, "D1", "D2", "區划");
            RangeBuild(oSheet, "E1", "E2", "規模");
            RangeBuild(oSheet, "F1", "H1", "總存欄量");
            RangeBuild(oSheet, "F2", "F2", "期初");
            RangeBuild(oSheet, "G2", "G2", "期末");
            RangeBuild(oSheet, "H2", "H2", "變更");
            RangeBuild(oSheet, "I1", "K1", "母豬");
            RangeBuild(oSheet, "I2", "I2", "期初");
            RangeBuild(oSheet, "J2", "J2", "期末");
            RangeBuild(oSheet, "K2", "K2", "變更");
            RangeBuild(oSheet, "L1", "N1", "肉豬");
            RangeBuild(oSheet, "L2", "L2", "期初");
            RangeBuild(oSheet, "M2", "M2", "期末");
            RangeBuild(oSheet, "N2", "N2", "變更");
            RangeBuild(oSheet, "O1", "Q1", "仔豬");
            RangeBuild(oSheet, "O2", "O2", "期初");
            RangeBuild(oSheet, "P2", "P2", "期末");
            RangeBuild(oSheet, "Q2", "Q2", "變更");
            RangeBuild(oSheet, "R1", "T1", "公豬");
            RangeBuild(oSheet, "R2", "R2", "期初");
            RangeBuild(oSheet, "S2", "S2", "期末");
            RangeBuild(oSheet, "T2", "T2", "變更");
            RangeBuild(oSheet, "U1", "W1", "總面積");
            RangeBuild(oSheet, "U2", "U2", "期初");
            RangeBuild(oSheet, "V2", "V2", "期末");
            RangeBuild(oSheet, "W2", "W2", "變更");
            RangeBuild(oSheet, "X1", "Z1", "批建");
            RangeBuild(oSheet, "X2", "X2", "期初");
            RangeBuild(oSheet, "Y2", "Y2", "期末");
            RangeBuild(oSheet, "Z2", "Z2", "變更");
            RangeBuild(oSheet, "AA1", "AC1", "未批建");
            RangeBuild(oSheet, "AA2", "AA2", "期初");
            RangeBuild(oSheet, "AB2", "AB2", "期末");
            RangeBuild(oSheet, "AC2", "AC2", "變更");
            #endregion 
            //將DataTable中的數據導入Excel中
            for (int i = 0; i < rowNum; i++)
            {
             
                for (int j = 0; j < columnNum; j++)
                {
                   ///excel中的列是從1開始的
                    xlApp.Cells[i+2, j+1] = tmpDataTable.Rows[i][j].ToString();
                }
            }
            ///保存,路徑一塊穿進去。否則回到一個很奇妙的地方，貌似是system32里 temp下....
            oSheet.SaveAs(@"D:\a\" + strFileName);
        }

        private static void RangeBuild(_Worksheet oSheet,string startcell,string endcell,string value)
        {
            ///創建一個區域對象。第一個參數是開始格子號，第二個參數是終止格子號。比如選中A1——D3這個區域。
            Range range = (Range)oSheet.get_Range(startcell, endcell);
            ///合並方法，0的時候直接合並為一個單元格
            range.Merge(0);
            ///合並單元格之后，設置其中的文本
            range.Value = value;
            //橫向居中
            range.HorizontalAlignment = XlVAlign.xlVAlignCenter;
            ///字體大小
            range.Font.Size = 18;
        ///字體
            range.Font.Name = "黑體";
            ///行高
            range.RowHeight = 24;
            //自動調整列寬
            range.EntireColumn.AutoFit();
            //填充顏色
            range.Interior.ColorIndex = 20;
            //設置單元格邊框的粗細
            range.Cells.Borders.LineStyle = 1;
        }

我這樣導出的excel是這樣子的