Asp.Net页面导入和导出到EXCEL

首先感谢CSDN为我们提供了这样一个交流平台！

近来，在开发ISO文件管理系统的时候，曾经遇到过要将ASPX直接输出到EXCEL的需求，现将经验所得与大家分享。

其实，利用ASP.NET输出指定内容的WORD、EXCEL、TXT、HTM等类型的文档很容易的。主要分为三步来完成。

一、定义文档类型、字符编码

        Response.Clear();
        Response.Buffer= true;
        Response.Charset="utf-8";

        //下面这行很重要，  attachment 参数表示作为附件下载，您可以改成 online在线打开

       //filename=FileFlow.xls 指定输出文件的名称，注意其扩展名和指定文件类型相符，可以为：.doc || .xls || .txt ||.htm

        Response.AppendHeader("Content-Disposition","attachment;filename=FileFlow.xls");
        Response.ContentEncoding=System.Text.Encoding.GetEncoding("utf-8");

        //Response.ContentType指定文件类型 可以为application/ms-excel || application/ms-word || application/ms-txt || application/ms-html || 或其他浏览器可直接支持文档

        Response.ContentType = "application/ms-excel";
        this.EnableViewState = false;

二、定义一个输入流

        System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);

三、将目标数据绑定到输入流输出

        this.RenderControl(oHtmlTextWriter);

        //this 表示输出本页，你也可以绑定datagrid,或其他支持obj.RenderControl()属性的控件

        Response.Write(oStringWriter.ToString());
        Response.End();

===============

 

    public class DataUtil
    {
        public DataUtil()
        {
        }

        #region 导入数据到GridView

        /// <summary>
        /// 导入数据到GridView
        /// </summary>
        /// <param name="fileName">源Excel文件</param>
        /// <param name="gridview">目标GridView</param>
        /// <param name="keyColIndex">导入主键列</param>
        /// <param name="rtnMsg">返回消息</param>
        /// <returns>返回没有导入的数据DataSet</returns>
        public static DataSet ExcelToGridView(string fileName, GridView gridview, int keyColIndex,string rtnMsg)
        {
            DataSet ds = null ;
            string errMsg = string.Empty;
            try
            {
                if ( ! fileName.EndsWith(".xls"))
                {
                    errMsg += "只能导入Excel格式的文件。";
                }

                ds = ExcelHelper.ExcelToDS(fileName);
                DataTable dt = ds.Tables[0];
                for (int i = 0; i < gridview.Rows.Count; i++)
                {
                    if (gridview.Rows[i].RowType != DataControlRowType.DataRow)
                    {
                        continue;
                    }
                    string key = gridview.Rows[i].Cells[keyColIndex].Text;
                    if (String.IsNullOrEmpty(key))
                    {
                        continue;
                    }
                    int k = 0;
                    for (; k < dt.Rows.Count; k++)
                    {
                        if (dt.Rows[k][gridview.Columns[keyColIndex].HeaderText].ToString().Replace(" ", "").Replace("　", "") == key)
                        {
                            break;
                        }
                    }
                    if (k == dt.Rows.Count)
                    {
                        continue;
                    }
                    else
                    {
                        for (int j = 0; j < gridview.Columns.Count; j++)
                        {
                            if (gridview.Columns[j].Visible == false)
                            {
                                continue;
                            }
                            if (gridview.Rows[i].Cells[j].Controls.Count == 0)
                            {
                                continue;
                            }
                            for (int m = 0; m < gridview.Rows[i].Cells[j].Controls.Count; m++)
                            {
                                if (gridview.Rows[i].Cells[j].Controls[m].Visible == false)
                                {
                                    continue;
                                }
                                if (gridview.Rows[i].Cells[j].Controls[m] is TextBox)
                                {
                                    if (!dt.Columns.Contains(gridview.Columns[j].HeaderText))
                                    {
                                        continue;
                                    }
                                    TextBox txt = gridview.Rows[i].Cells[j].Controls[m] as TextBox;
                                    string temp = dt.Rows[k][gridview.Columns[j].HeaderText].ToString();
                                    try
                                    {
                                        //           int intTemp = int.Parse(temp);
                                        //           txt.Text = intTemp.ToString();
                                        txt.Text = temp; //Translate(temp);
                                    }
                                    catch (Exception)
                                    {
                                    }
                                    break;
                                }
                            }
                        }
                        dt.Rows[k].Delete();
                        dt.AcceptChanges();
                    }
                }
            }
            catch (Exception ex)
            {
                errMsg +="导入失败."  + ex.Message ;
            }
            rtnMsg = errMsg;
            return ds;
        }

        /// <summary>
        /// 导入数据到GridView
        /// </summary>
        /// <param name="fileUpload">文件上传控件对象</param>
        /// <param name="filePath">要存放文件的服务器路径</param>
        /// <param name="gridview">目标GridView</param>
        /// <param name="keyColIndex">用于导入的主键列</param>
        /// <returns>返回没有导入的数据DataSet</returns>
        public static DataSet ExcelToGridView(FileUpload fileUpload, string filePath, GridView gridview, int keyColIndex, string strMsg)
        {
            string errMsg = string.Empty;
            DataSet ds = null ;
            try
            {
                if ( ! filePath.EndsWith("\\"))
                {
                    filePath += "\\";
                }
                string fileName = fileUpload.FileName.Replace(".xls", "") + "_" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xls";
                string fullFileName = filePath + fileName;
                fileUpload.SaveAs(fullFileName);
                ds = ExcelToGridView(fullFileName, gridview, keyColIndex,errMsg);
                if ( errMsg != string.Empty)
                {
                    errMsg += "将数据导入GridView失败." + errMsg ;
                };
            }
            catch (Exception ex)
            {
                errMsg += "上传excel文件失败." ;
            }
            strMsg = errMsg;
            return ds ;
        }

        #endregion

        /// <summary>
        /// 选定主键列后，用这方法将重复行用黄色背景标志
        /// </summary>
        /// <param name="gridview">目标GridView</param>
        /// <param name="keyColIndex">导入主键列</param>
        public static void MarkRepetitionRows(GridView gridView, int keyColIndex)
        {
            for (int i = 0; i < gridView.Rows.Count; i++)
            {
                for (int j = i + 1; j < gridView.Rows.Count; j++)
                {
                    if (gridView.Rows[i].Cells[keyColIndex].Text == gridView.Rows[j].Cells[keyColIndex].Text)
                    {
                        gridView.Rows[i].BackColor = Color.Yellow;
                        gridView.Rows[j].BackColor = Color.Yellow;
                    }
                }
            }
        }

    }