【原創】WinForm導出數據到EXCEL（根據微軟的Excel插件）

導出數據到Excel算是一個比較成熟的技術點了，現在的方法也比較，比如：可以用微軟的EXCEL組件，第三方開源組件(NPOI,MyXls等等。)
今天我就首先說一下微軟的EXCEL組件

在開發過程中可能出現一系列的問題

（1）Excel行數的限制，office2003的行數為65536行。如果超過這個行數應該再來一個sheet

（2）導出數據慢的問題，如果數據量比較小可能一般的程序邏輯看不出來它的性能問題，當我們導出的數據很多時，應該選擇什么方案解決

（3)  導出的格式問題，一些導出到Excel中的格式可能需要計算，那么它就是數字型的

本例先簡單說一下實現邏輯，不多說，直接上代碼：

（1）添加引用

（2）可以寫代碼了

第一步：創建一個Excel工作薄

           Interop.Excel.Application xlApp = new Interop.Excel.Application(); ////建立一個Excel.Application的新進程

            Excel.Workbooks workbooks = xlApp.Workbooks; //工作薄的創建

            Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet); //工作表sheet的創建

【當然也可以用下面的代碼創建工作表sheet】

  　　　　object missing = System.Reflection.Missing.Value;

              Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets.Add(missing, missing, missing, missing);//添加一個sheet

第二步：插入數據

                        object[,] dataArray = new object[rowCount, colCount];

                        for (int j = 0; j < rowCount; j++)

                        {

                            for (int k = 0; k < colCount; k++)

                            {

                                dataArray[j, k] = drs[j][k].ToString();

                            }

                        }

                        worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowCount, colCount]).Value2 = dataArray;

注：這種方式是把一個二維數組的數據插入到Excel的固定區域，不用一個單元格一個單元格的插入，速度快很多。解決了導出數據慢的問題

可能你保存的時候定義Excel的格式，可以用NumberFormat來定義，例如：

worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowCount + 1, colCount]).NumberFormat = "@";

第三步：保存Excel

 workbook.SaveAs(strFilePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                workbook.Close(true, Type.Missing, Type.Missing);
                workbook = null;

 

以上是最簡潔的方式，不過第一個問題還沒有給解決，直接上代碼吧。主要是邏輯問題了。沒有什么技術難點。

/// <summary>
        /// 導出Excel文件
        /// </summary>
        /// <param name="ds">要導入到Excel的數據</param>
        public static string DataSetToExcel2(System.Data.DataSet ds)
        {
            string strFilePath = System.AppDomain.CurrentDomain.BaseDirectory + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xls";

            Interop.Excel.Application xlApp = new Interop.Excel.Application();
            Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Interop.Excel.Workbook workbook = workbooks.Add(Interop.Excel.XlWBATemplate.xlWBATWorksheet);

            try
            {
                if (ds.Tables.Count == 0)
                {
                    return "沒有數據導出";
                }

                int MaxRowCount = 60000; //一個sheet的最大行數限制，主要考慮到office2003的行數有限

                DataTable dt = ds.Tables[0];//數據源

                int rowCount = dt.Rows.Count;
                int colCount = dt.Columns.Count;

                if (rowCount > 0 && rowCount <= MaxRowCount)
                {
                    object missing = System.Reflection.Missing.Value;
                    Interop.Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets.Add(missing, missing, missing, missing);//添加一個sheet
                    //Worksheet worksheet = (Worksheet)workbook.Worksheets[i];
                    worksheet.Name = "sheet";


                    object[,] dataArray = new object[rowCount + 1, colCount];
                    //表頭導出
                    for (int j = 0; j < colCount; j++)
                    {
                        dataArray[0, j] = dt.Columns[j].ColumnName.ToString();
                    }
                    //內容導出
                    for (int j = 0; j < rowCount; j++)
                    {
                        for (int k = 0; k < colCount; k++)
                        {
                            dataArray[j + 1, k] = dt.Rows[j][k].ToString();
                        }
                    }
                    worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowCount + 1, colCount]).NumberFormat = "@";
                    worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowCount + 1, colCount]).Value2 = dataArray;
                }
                else //超過sheet表單的就再創適sheet表單
                {
                    int sheetCount = 1; //sheet表單個數
                    if (rowCount % MaxRowCount == 0)
                    {
                        sheetCount = rowCount / MaxRowCount;
                    }
                    else
                    {
                        sheetCount = rowCount / MaxRowCount + 1;
                    }

                    int Flag = 1;
                    for (var m = 0; m < sheetCount; m++)
                    {
                        //添加一個sheet表單
                        object missing1 = System.Reflection.Missing.Value;
                        Excel.Worksheet worksheet1 = (Excel.Worksheet)workbook.Worksheets.Add(missing1, missing1, missing1, missing1);//添加一個sheet

                        worksheet1.Name = "第" + (m + 1) + "頁sheet";
                        //如果是最后一個sheet的話 並且最后一個sheet表單數據不等於60000
                        if (Flag == sheetCount && (rowCount % MaxRowCount != 0))
                        {
                            int newrowCount = rowCount - ((Flag - 1) * MaxRowCount); //最后一個sheet的數據
                            object[,] dataArray = new object[newrowCount + 1, colCount];

                            int RowIndex = 0;


                            for (int j = 0; j < colCount; j++)
                            {
                                dataArray[0, j] = dt.Columns[j].ColumnName.ToString();
                            }

                            int startIndex = (Flag - 1) * MaxRowCount;
                            for (int n = startIndex; n < startIndex + newrowCount; n++)
                            {
                                for (int t = 0; t < colCount; t++)
                                {
                                    dataArray[RowIndex + 1, t] = dt.Rows[n][t].ToString();
                                }

                                   RowIndex++;
                            }
                            worksheet1.get_Range(worksheet1.Cells[1, 1], worksheet1.Cells[newrowCount + 1, colCount]).NumberFormat = "@";
                            worksheet1.get_Range(worksheet1.Cells[1, 1], worksheet1.Cells[newrowCount + 1, colCount]).Value2 = dataArray;

                        }
                        else
                        {
                            object[,] dataArray = new object[MaxRowCount + 1, colCount];

                            int RowIndex = 0;
                            for (int j = 0; j < colCount; j++)
                            {
                                dataArray[0, j] = dt.Columns[j].ColumnName.ToString();
                            }

                            int startIndex = (Flag - 1) * MaxRowCount;
                            for (int n = startIndex; n < startIndex + MaxRowCount; n++)
                            {
                                for (int t = 0; t < colCount; t++)
                                {
                                    dataArray[RowIndex + 1, t] = dt.Rows[n][t].ToString();
                                }
                                if (n % 100 == 0)
                                {

                                    System.Windows.Forms.Application.DoEvents();
                                }

                                RowIndex++;
                            }
                            worksheet1.get_Range(worksheet1.Cells[1, 1], worksheet1.Cells[MaxRowCount + 1, colCount]).NumberFormat = "@";
                            worksheet1.get_Range(worksheet1.Cells[1, 1], worksheet1.Cells[MaxRowCount + 1, colCount]).Value2 = dataArray;
                        }
                        Flag++;
                    }

                }
                workbook.SaveAs(strFilePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                workbook.Close(true, Type.Missing, Type.Missing);
                workbook = null;
            }


            catch
            {
                xlApp.Quit();
                xlApp = null;
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);

                GC.Collect();
                return "出現異常";
            }
            finally
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);

                GC.Collect();
            }

            return "導出成功，導出文件路徑：" + strFilePath;
        }

 

頭一次寫文章，主要記錄自己開發過程的點點滴滴，如果能幫助大家一點最好，哈哈。

 轉載的請注原創地址，謝謝。