C# 几十万级数据导出Excel，及Excel各种操作

    先上导出代码
    /// <summary>
            /// 导出速度最快
            /// </summary>
            /// <param name="list"><列名，数据></param>
            /// <param name="filepath"></param>
            /// <returns></returns>
            public bool NewExport(List<DictionaryEntry> list, string filepath)
            {
                bool bSuccess = true;
                Microsoft.Office.Interop.Excel.Application appexcel = new Microsoft.Office.Interop.Excel.Application();
                System.Reflection.Missing miss = System.Reflection.Missing.Value;
                appexcel = new Microsoft.Office.Interop.Excel.Application();
                Microsoft.Office.Interop.Excel.Workbook workbookdata = null;
                Microsoft.Office.Interop.Excel.Worksheet worksheetdata = null;
                Microsoft.Office.Interop.Excel.Range rangedata;  

                workbookdata = appexcel.Workbooks.Add();  

                //设置对象不可见
                appexcel.Visible = false;
                appexcel.DisplayAlerts = false;
                try
                {
                    foreach (var lv in list)
                    {
                        var keys = lv.Key as List<string>;
                        var values = lv.Value as List<IList<object>>;
                        worksheetdata = (Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets.Add(miss, workbookdata.ActiveSheet);  

                        for (int i = 0; i < keys.Count-1; i++)
                        {
                            //给工作表赋名称
                            worksheetdata.Name = keys[0];//列名的第一个数据位表名
                            worksheetdata.Cells[1, i + 1] = keys[i+1];
                        }  

                        //因为第一行已经写了表头，所以所有数据都应该从a2开始
                        rangedata = worksheetdata.get_Range("a2", miss);
                        Microsoft.Office.Interop.Excel.Range xlrang = null;  

                        //irowcount为实际行数，最大行
                        int irowcount = values.Count;
                        int iparstedrow = 0, icurrsize = 0;  

                        //ieachsize为每次写行的数值，可以自己设置
                        int ieachsize = 10000;  

                        //icolumnaccount为实际列数，最大列数
                        int icolumnaccount = keys.Count-1;  

                        //在内存中声明一个ieachsize×icolumnaccount的数组，ieachsize是每次最大存储的行数，icolumnaccount就是存储的实际列数
                        object[,] objval = new object[ieachsize, icolumnaccount];
                        icurrsize = ieachsize;  

                        while (iparstedrow < irowcount)
                        {
                            if ((irowcount - iparstedrow) < ieachsize)
                                icurrsize = irowcount - iparstedrow;  

                            //用for循环给数组赋值
                            for (int i = 0; i < icurrsize; i++)
                            {
                                for (int j = 0; j < icolumnaccount; j++)
                                {
                                    var v = values[i + iparstedrow][j];
                                    objval[i, j] = v != null ? v.ToString() : "";
                                }
                            }
                            string X = "A" + ((int)(iparstedrow + 2)).ToString();
                            string col = "";
                            if (icolumnaccount <= 26)
                            {
                                col = ((char)(‘A‘ + icolumnaccount - 1)).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString();
                            }
                            else
                            {
                                col = ((char)(‘A‘ + (icolumnaccount / 26 - 1))).ToString() + ((char)(‘A‘ + (icolumnaccount % 26 - 1))).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString();
                            }
                            xlrang = worksheetdata.get_Range(X, col);
                            xlrang.NumberFormat = "@";
                            // 调用range的value2属性，把内存中的值赋给excel
                            xlrang.Value2 = objval;
                            iparstedrow = iparstedrow + icurrsize;
                        }
                    }
                    ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet1"]).Delete();
                    ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet2"]).Delete();
                    ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet3"]).Delete();
                    //保存工作表
                    workbookdata.SaveAs(filepath, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
                    workbookdata.Close(false, miss, miss);
                    appexcel.Workbooks.Close();
                    appexcel.Quit();  

                    System.Runtime.InteropServices.Marshal.ReleaseComObject(workbookdata);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel.Workbooks);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel);
                    GC.Collect();
                }
                catch (Exception ex)
                {
                    ErrorMsg = ex.Message;
                    bSuccess = false;
                }
                finally
                {
                    if (appexcel != null)
                    {
                        ExcelImportHelper.KillSpecialExcel(appexcel);
                    }
                }
                return bSuccess;
            }  

range.NumberFormatLocal = "@";     //设置单元格格式为文本     

range = (Range)worksheet.get_Range("A1", "E1");     //获取Excel多个单元格区域：本例做为Excel表头     

range.Merge(0);     //单元格合并动作     

worksheet.Cells[1, 1] = "Excel单元格赋值";     //Excel单元格赋值     

range.Font.Size = 15;     //设置字体大小     

range.Font.Underline=true;     //设置字体是否有下划线     

range.Font.Name="黑体";       设置字体的种类     

range.HorizontalAlignment=XlHAlign.xlHAlignCenter;     //设置字体在单元格内的对其方式     

range.ColumnWidth=15;     //设置单元格的宽度     

range.Cells.Interior.Color=System.Drawing.Color.FromArgb(255,204,153).ToArgb();     //设置单元格的背景色     

range.Borders.LineStyle=1;     //设置单元格边框的粗细     

range.BorderAround(XlLineStyle.xlContinuous,XlBorderWeight.xlThick,XlColorIndex.xlColorIndexAutomatic,System.Drawing.Color.Black.ToArgb());     //给单元格加边框     

range.Borders.get_Item(Microsoft.Office.Interop.Excel.XlBordersIndex.xlEdgeTop).LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlLineStyleNone; //设置单元格上边框为无边框     

range.EntireColumn.AutoFit();     //自动调整列宽     

Range.HorizontalAlignment= xlCenter;     // 文本水平居中方式     

Range.VerticalAlignment= xlCenter     //文本垂直居中方式     

Range.WrapText=true;     //文本自动换行     

Range.Interior.ColorIndex=39;     //填充颜色为淡紫色     

Range.Font.Color=clBlue;     //字体颜色     

xlsApp.DisplayAlerts=false;   //对Excel的操作 不弹出提示信息
ApplicationClass xlsApp = new ApplicationClass(); // 1. 创建Excel应用程序对象的一个实例，相当于我们从开始菜单打开Excel应用程序。
if (xlsApp == null)
{
//对此实例进行验证，如果为null则表示运行此代码的机器可能未安装Excel
}  

1. 打开现有的Excel文件  

Workbook workbook = xlsApp.Workbooks.Open(excelFilePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
Worksheet mySheet = workbook.Sheets[1] as Worksheet; //第一个sheet页
mySheet.Name = "testsheet"; //这里修改sheet名称  

2.复制sheet页  

mySheet.Copy(Type.Missing, workbook.Sheets[1]); //复制mySheet成一个新的sheet页，复制完后的名称是mySheet页名称后加一个(2)，这里就是testsheet(2)，复制完后，Worksheet的数量增加一个  

注意 这里Copy方法的两个参数，指是的复制出来新的sheet页是在指定sheet页的前面还是后面，上面的例子就是指复制的sheet页在第一个sheet页的后面。
3.删除sheet页  

xlsApp.DisplayAlerts = false; //如果想删除某个sheet页，首先要将此项设为fasle。
(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Delete();  

4.选中sheet页  

(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Select(Type.Missing); //选中某个sheet页  

5.另存excel文件  

workbook.Saved = true;
workbook.SaveCopyAs(filepath);  

6.释放excel资源  

workbook.Close(true, Type.Missing, Type.Missing);
workbook = null;
xlsApp.Quit();
xlsApp = null;