C#(Winform开发)Excel导出

　　网上搜索了一下导出功能，有好些不能使用或者缺少引用文件，浪费本人时间。所以记录一个能用的例子，(代码转载)

　　开发工具vs2015，首先点击  （工具—>NuGet包管理器—>管理解决方案的 NuGet 程序包—>搜索:  Microsoft.Office.Interop.Excel 安装）
　　
　　代码如下:
　　　　　　

   //导出Excel
        private void ExportExcel(DataTable dt)
        {
            DataSet ds = new DataSet();//数据源
            ds.Tables.Add(dt);
            if (ds == null) return;
            string saveFileName = "";
            bool fileSaved = false;
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xls";
            saveDialog.Filter = "Excel文件|*.xls";
            saveDialog.FileName = "Sheet1";
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) return; //被点了取消

            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
                return;
            }
            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 
                                                                                //写入字段 
            for (int i = 0; i < ds.Tables[0].Columns.Count; i++)
            {
                worksheet.Cells[1, i + 1] = ds.Tables[0].Columns[i].ColumnName;
            }
            //写入数值 

            for (int r = 0; r < ds.Tables[0].Rows.Count; r++)
            {
                for (int i = 0; i < ds.Tables[0].Columns.Count; i++)
                {
                    worksheet.Cells[r + 2, i + 1] = ds.Tables[0].Rows[r][i];
                }
                System.Windows.Forms.Application.DoEvents();
            }
            worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
            //Microsoft.Office.Interop.Excel.Range rg = worksheet.get_Range(worksheet.Cells[2, 2], worksheet.Cells[ds.Tables[0].Rows.Count + 1, 2]);
            Microsoft.Office.Interop.Excel.Range rg = worksheet.Range[worksheet.Cells[2, 2], worksheet.Cells[ds.Tables[0].Rows.Count + 1, 2]];
            rg.NumberFormat = "00000000";
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);
                    fileSaved = true;
                }
                catch (Exception ex)
                {
                    fileSaved = false;
                    MessageBox.Show("导出文件时出错,文件可能正被打开！
" + ex.Message);
                }
            }
            else
            {
                fileSaved = false;
            }
            xlApp.Quit();
            GC.Collect();//强行销毁 
            if (fileSaved && System.IO.File.Exists(saveFileName)) System.Diagnostics.Process.Start(saveFileName); //打开EXCEL
        }

    调用时编辑好传入的datatable的内容就行，dt的表头就是Excel的标头。