C#实现GridView导出Excel实例代码

2019-10-29 21:11:59

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导出Excel在很多项目中经常用到，本人介绍了C#实现GridView导出Excel实例代码，也全当给自己留下个学习笔记了。

using System.Data;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.IO;using System.Text;namespace DotNet.Utilities{ /// <summary> /// Summary description for GridViewExport /// </summary> public class GridViewExport {  public GridViewExport()  {   //   // TODO: Add constructor logic here   //  }  public static void Export(string fileName, GridView gv)  {   HttpContext.Current.Response.Clear();   HttpContext.Current.Response.AddHeader(    "content-disposition", string.Format("attachment; filename={0}", fileName));   HttpContext.Current.Response.ContentType = "application/ms-excel";   //HttpContext.Current.Response.Charset = "utf-8";   using (StringWriter sw = new StringWriter())   {    using (HtmlTextWriter htw = new HtmlTextWriter(sw))    {     // Create a form to contain the grid     Table table = new Table();     table.GridLines = GridLines.Both; //单元格之间添加实线     // add the header row to the table     if (gv.HeaderRow != null)     {      PrepareControlForExport(gv.HeaderRow);      table.Rows.Add(gv.HeaderRow);     }     // add each of the data rows to the table     foreach (GridViewRow row in gv.Rows)     {      PrepareControlForExport(row);      table.Rows.Add(row);     }     // add the footer row to the table     if (gv.FooterRow != null)     {      PrepareControlForExport(gv.FooterRow);      table.Rows.Add(gv.FooterRow);     }     // render the table into the htmlwriter     table.RenderControl(htw);     // render the htmlwriter into the response     HttpContext.Current.Response.Write(sw.ToString());     HttpContext.Current.Response.End();    }   }  }  /// <summary>  /// Replace any of the contained controls with literals  /// </summary>  /// <param name="control"></param>  private static void PrepareControlForExport(Control control)  {   for (int i = 0; i < control.Controls.Count; i++)   {    Control current = control.Controls[i];    if (current is LinkButton)    {     control.Controls.Remove(current);     control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));    }    else if (current is ImageButton)    {     control.Controls.Remove(current);     control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));    }    else if (current is HyperLink)    {     control.Controls.Remove(current);     control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));    }    else if (current is DropDownList)    {     control.Controls.Remove(current);     control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));    }    else if (current is CheckBox)    {     control.Controls.Remove(current);     control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));    }    if (current.HasControls())    {     PrepareControlForExport(current);    }   }  }  /// <summary>  /// 导出Grid的数据(全部)到Excel  /// 字段全部为BoundField类型时可用  /// 要是字段为TemplateField模板型时就取不到数据  /// </summary>  /// <param name="grid">grid的ID</param>  /// <param name="dt">数据源</param>  /// <param name="excelFileName">要导出Excel的文件名</param>  public static void OutputExcel(GridView grid, DataTable dt, string excelFileName)  {   Page page = (Page)HttpContext.Current.Handler;   page.Response.Clear();   string fileName = System.Web.HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(excelFileName));   page.Response.AddHeader("Content-Disposition", "attachment:filename=" + fileName + ".xls");   page.Response.ContentType = "application/vnd.ms-excel";   page.Response.Charset = "utf-8";   StringBuilder s = new StringBuilder();   s.Append("<HTML><HEAD><TITLE>" + fileName + "</TITLE><META http-equiv=/"Content-Type/" content=/"text/html; charset=utf-8/"></head><body>");   int count = grid.Columns.Count;   s.Append("<table border=1>");   s.AppendLine("<tr>");   for (int i = 0; i < count; i++)   {    if (grid.Columns[i].GetType() == typeof(BoundField))     s.Append("<td>" + grid.Columns[i].HeaderText + "</td>");    //s.Append("<td>" + grid.Columns[i].HeaderText + "</td>");   }   s.Append("</tr>");   foreach (DataRow dr in dt.Rows)   {    s.AppendLine("<tr>");    for (int n = 0; n < count; n++)    {     if (grid.Columns[n].Visible && grid.Columns[n].GetType() == typeof(BoundField))      s.Append("<td>" + dr[((BoundField)grid.Columns[n]).DataField].ToString() + "</td>");    }    s.AppendLine("</tr>");   }   s.Append("</table>");   s.Append("</body></html>");   page.Response.BinaryWrite(System.Text.Encoding.GetEncoding("utf-8").GetBytes(s.ToString()));   page.Response.End();  } }}

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