.NET 导出到Excel功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Reflection;

namespace Entry.Web.lib
{
    /// <summary>
    /// 导出excel 简单实现
    /// </summary>
    public static class ExcelUtil
    {
        /// <summary>
        /// 方法1: 将DataTable导出为Excel文件

        /// </summary>
        /// <param name="dt">DataTable,需要导出的DataTable，请使用中文列名</param>
        /// <param name="AbosultedFilePath">string,导出文件的绝对路径</param>
        /// <returns>bool,true导出成功.false导出失败</returns>
        public static bool ExportToExcel(System.Data.DataTable dt, string AbosultedFilePath)
        {
            //检查数据表是否为空，如果为空，则退出
            if (dt == null)
                return false;

            //创建Excel应用程序对象，如果未创建成功则退出
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                System.Web.HttpContext.Current.Response.Write("无法创建Excel对象，可能你的电脑未装Excel");
                return false;
            }

            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
            Microsoft.Office.Interop.Excel.Range range = null;
            long totalCount = dt.Rows.Count;
            long rowRead = 0;
            float percent = 0;

            //写入标题
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                //写入标题名称
                worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;

                //设置标题的样式
                range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
                range.Font.Bold = true; //粗体
                range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter; //居中

                range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null); //背景色
                range.EntireColumn.AutoFit(); //自动设置列宽
                range.EntireRow.AutoFit(); //自动设置行高
            }

            //写入DataTable中数据的内容
            for (int r = 0; r < dt.Rows.Count; r++)
            {
                for (int c = 0; c < dt.Columns.Count; c++)
                {
                    //写入内容
                    worksheet.Cells[r + 2, c + 1] = "'" + dt.Rows[r][c].ToString();
                    //设置样式
                    range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[r + 2, c + 1];
                    range.Font.Size = 9; //字体大小
                    range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null); //加边框
                    range.EntireColumn.AutoFit(); //自动调整列宽
                }
                rowRead++;
                percent = ((float)(100 * rowRead)) / totalCount;
                System.Windows.Forms.Application.DoEvents();
            }

            range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
            if (dt.Columns.Count > 1)
            {
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
            }

            try
            {
                workbook.Saved = true;
                workbook.SaveCopyAs(AbosultedFilePath);
            }
            catch (Exception ex)
            {
                System.Web.HttpContext.Current.Response.Write("导出文件时出错，文件可能正被打开!\n" + ex.ToString());
                return false;
            }

            workbooks.Close();

            if (xlApp != null)
            {
                xlApp.Workbooks.Close();
                xlApp.Quit();

                int generation = System.GC.GetGeneration(xlApp);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);

                xlApp = null;
                System.GC.Collect(generation);
            }
            GC.Collect(); //强行销毁

            #region 强行杀死最近打开的Excel进程
            System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");
            System.DateTime startTime = new DateTime();
            int m, killID = 0;
            for (m = 0; m < excelProc.Length; m++)
            {
                if (startTime < excelProc[m].StartTime)
                {
                    startTime = excelProc[m].StartTime;
                    killID = m;
                }
            }
            if (excelProc[killID].HasExited == false)
            {
                excelProc[killID].Kill();
            }
            #endregion

            return true;
        }

        /// <summary>
        /// 方法2：将页面上的数据导出到excel
        /// </summary>
        /// <param name="ctl">页面上显示数据的控件</param>
        public static void ToExcel(System.Web.UI.Control ctl)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Charset = "";
            string filename = "Report" + System.DateTime.Now.ToString("_yyyyMMddHHmm");
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" +
            System.Web.HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8) + ".xls");
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
            HttpContext.Current.Response.ContentType = "application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword  
            ctl.Page.EnableViewState = false;
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            ctl.RenderControl(hw);
            HttpContext.Current.Response.Write(tw.ToString());
            HttpContext.Current.Response.End();
        }
 
    }
}

方法3:

    添加Microsoft.Office.Interop.Excel引用，并将其属性 “嵌入互操作类型”改为false

        private void ExportToExcel(DataTable datatable)
        {
            Microsoft.Office.Interop.Excel.ApplicationClass ac = new Microsoft.Office.Interop.Excel.ApplicationClass();
            Microsoft.Office.Interop.Excel.Workbook wb;
            Microsoft.Office.Interop.Excel.Worksheet ws;

            //创建工作簿
            wb = ac.Workbooks.Add(System.Reflection.Missing.Value);
            //创建工作表
            ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.Add(System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value);

            ws.Name = "Excel标题";
            //将数据导入工作表的单元格
            if (datatable != null)
            {
                for (int i = 0; i < datatable.Rows.Count; i++)
                {
                    for (int j = 0; j < datatable.Columns.Count; j++)
                    {
                        ws.Cells[1, j + 1] = datatable.Columns[j].ColumnName.ToString();
                        ws.Cells[i + 2, j + 1] = datatable.Rows[i][j].ToString();
                    }
                }

                //保存文件
                SaveFileDialog objSFD = new SaveFileDialog();
                objSFD.Filter = "Excel表(*.xlsx)|*.xlsx";
                if (objSFD.ShowDialog() == true)
                {
                    ws.SaveAs(objSFD.FileName.ToString());
                }
                wb.Close();
                ac.Quit();
            }
        }

方法4：

        /// <summary>
        /// 方法4:将页面的数据导出到WORD 或者EXCEL
        /// </summary>
        /// <param name="ctl">含数据的控件</param>
        /// <param name="FileType">Excel ;Word</param>
        public static void ToFiles(System.Web.UI.Control ctl,string FileType)
        {
            string strFileName = DateTime.Now.ToString("yyyyMMdd-hhmmss");
            System.Web.HttpContext HC = System.Web.HttpContext.Current;
            HC.Response.Clear();
            HC.Response.Buffer = true;
            HC.Response.ContentEncoding = System.Text.Encoding.UTF8;//设置输出流为简体中文
            if (FileType == "Word")
            {
                //--- 导出为Word文件
                HC.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8) + ".doc");
                HC.Response.ContentType = "application/ms-word";//设置输出文件类型为Word文件。
            }
            else
            {
                //---导出为Excel文件
                HC.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8) + ".xls");
                HC.Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。
            }
            System.IO.StringWriter sw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
            ctl.RenderControl(htw);
            HC.Response.Write(sw.ToString());
            HC.Response.End();
        }