C# 往excel出力数据

   /// <summary>
   /// 出力Excel
   /// </summary>
   /// <param name="storeModelForExcel"></param>
   public void GenerateExcel(List<ExcelModel> excelModelList,string savePath)
   {
       Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
       if (excel == null)
       {
           return;
       }
       //设置为不可见，操作在后台执行，为 true 的话会打开 Excel
       excel.Visible = false;
       //打开时设置为全屏显式
       //excel.DisplayFullScreen = true;
       //初始化工作簿
       Microsoft.Office.Interop.Excel.Workbooks workbooks = excel.Workbooks;
       //新增加一个工作簿，Add（）方法也可以直接传入参数 true
       Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
       var tt = workbook.Worksheets.Count;
       try
       {
           for (int sheetNum = ; sheetNum < excelModelList.Count; sheetNum++)
           {
               Microsoft.Office.Interop.Excel.Range range;
               for (int k = ; k < tt; k++)
               {
                   //设置表的名称
                   Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[k + ];
                   worksheet.Name = excelModelList[sheetNum].dt.TableName;
                   range = worksheet.get_Range("A1", System.Reflection.Missing.Value);
                   range.NumberFormat = "@";
                   range = range.get_Resize(excelModelList[sheetNum].dt.Rows.Count + , excelModelList[sheetNum].dt.Columns.Count);
                   string[,] saRet = new string[excelModelList[sheetNum].dt.Rows.Count + , excelModelList[sheetNum].dt.Columns.Count];
                   //设置列名
                   for (int i = ; i < excelModelList[sheetNum].dt.Columns.Count; i++)
                   {
                       //设置第一行，即列名
                       saRet[, i] = excelModelList[sheetNum].dt.Columns[i].ColumnName;
                   }
                   //跳过第一行，第一行写入了列名
                   int rowIndex = ;
                   //写入数据
                   for (int i = ; i < excelModelList[sheetNum].dt.Rows.Count; i++)
                   {
                       for (int j = ; j < excelModelList[sheetNum].dt.Columns.Count; j++)
                       {
                           saRet[rowIndex + i, j] = excelModelList[sheetNum].dt.Rows[i][j].ToString();
                       }
                   }
                   range.set_Value(System.Reflection.Missing.Value, saRet);
                   //设置所有列宽为自动列宽
                   //worksheet.Columns.AutoFit();
                   //设置所有单元格列宽为自动列宽
                   worksheet.Cells.Columns.AutoFit();
               }
               //新增加一个 Excel 表(sheet)
               if (sheetNum < excelModelList.Count - )
               {
                   workbook.Worksheets.Add();
               }
           }
           //是否提示，如果想删除某个sheet页，首先要将此项设为fasle。
           excel.DisplayAlerts = false;
           //保存写入的数据，这里还没有保存到磁盘
           workbook.Saved = true;
           ////创建文件
           FileStream file = new FileStream(savePath, FileMode.CreateNew);
           //关闭释放流，不然没办法写入数据
           file.Close();
           file.Dispose();
           ////保存到指定的路径
           workbook.SaveCopyAs(savePath);
           workbook.Close(Type.Missing, Type.Missing, Type.Missing);
           excel.Quit();
           //关闭进程，防止启动多个，导致内存溢出
           IntPtr t = new IntPtr(excel.Hwnd);
           int processId = ;
           GetWindowThreadProcessId(t, out processId);
           System.Diagnostics.Process p = System.Diagnostics.Process.GetProcessById(processId);
           p.Kill();
       }
       catch (Exception e)
       {
           throw e;
       }
   }

   [DllImport("User32.dll", CharSet = CharSet.Auto)]
   public static extern int GetWindowThreadProcessId(IntPtr hwnd, out   int ID);

注意：数据先写到内存saRet，在一次性写进sheet

range.set_Value(System.Reflection.Missing.Value, saRet);