https://www.cnblogs.com/sizhizhiyue/p/4820973.html asp.net后台导出excel的方法一：使用response导出excel

asp.net后台导出excel的方法一：使用response导出excel

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方法一：带StringBuilder 方法的导出

该方法是将所有的数据通过html的形式写入到StringBuilder 中，然后通过response导出。

熟悉html格式的人可以改变成各种格式。

List<U> objList = new List<U>();
         objList = BLL.GetInfo();//读取数据                     
          
          StringBuilder sb = new StringBuilder();
          sb.Append("<style type="text/css">");
          sb.Append("<!--");
          sb.Append(".text");
          sb.Append("{mso-style-parent:style0;");
          sb.Append("font-size:10.0pt;");
          sb.Append("font-family:"Arial Unicode MS", sans-serif;");
          sb.Append("mso-font-charset:0;");
          sb.Append(@"mso-number-format:@;");
          sb.Append("text-align:center;");
          sb.Append("border:.5pt solid black;");
          sb.Append("white-space:normal;}");
          sb.Append("-->");
          sb.Append("</style>");
          sb.Append("<table cellspacing="0" rules="all" border="1" style="border-collapse:collapse;">");
          sb.Append("<tr align="Center" style="font-weight:bold;">");
          sb.Append("<td>ID</td><td>用户名</td><td>真实姓名</td><td>省份</td><td>注册时间</td");
          sb.Append("</tr>");
          foreach (U item in objList)
          {
              sb.Append("<tr align="Center"><td>" + item.id + "</td><td>" + item.uName + "</td><td>" + item.rName + "</td><td>" + item.proId + "</td><td>" + item.regDate + "</td></tr>");
          }
          sb.Append("</table>");
      System.Web.HttpContext.Current.Response.Clear();
      System.Web.HttpContext.Current.Response.Charset </span>= <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">GB2312</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;
      </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
      </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 添加头信息，为"文件下载/另存为"对话框指定默认文件名</span>
      System.Web.HttpContext.Current.Response.AddHeader(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">Content-Disposition</span><span style="color: rgba(128, 0, 0, 1)">"</span>, <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">attachment; filename=myU.xls</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
      </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 添加头信息，指定文件大小，让浏览器能够显示下载进度
      </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> System.Web.HttpContext.Current.Response.AddHeader("Content-Length",sb.ToString());

      </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 指定返回的是一个不能被客户端读取的流，必须被下载</span>
      System.Web.HttpContext.Current.Response.ContentType = <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">application/ms-excel</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;

      </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 把文件流发送到客户端</span>

          System.Web.HttpContext.Current.Response.Write(sb.ToString());

// 停止页面的执行



System.Web.HttpContext.Current.Response.End();

方法二：带StringWriter的导出方法

该方法的格式不容易改变方法与上面原理相同是将数据写入到StringWriter 中让后到导出

众所周知，Respone.Write()是输出Html流程序给用户的。考虑到一个标准的Web页面的是有多种呈现方式的，
例如:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 这是以标准网页形式输出Html流

<meta http-equiv="Content-Type" content="application/vnd.ms-excel">
<meta http-equiv="Content-Disposition" content="attachment; filename=ex.xls">这是以附件形式输出Html流，而且是将“数据”存放在ex.xls这个表格中。^_^

那么我们以编码的形式如何显示^_^（现在写VB了,给出的也是VB的事例）
1 Dim _DataStringWriter As StringWriter = New StringWriter 定义一个StringWriter对象
2 _DataStringWriter.WiteLine("FirstFieldName" + ControlChars.Tab + "SecondFieldName")给输出的Excel表格每列加入名称
3 从数据“容器”里面将数据取出。例如
   Dim dt as New DataTable
   For i as Integer = 0 To dt.Rows.Count - 1 Then
   _DataStringWriter.WiteLine(dt(i)(0) + ControlChars.Tab + dt(i)(1))
   Next
4 Response.AddHeader("Content-Disposition", "attachment; filename=" & fileName)
   Response.ContentType = "application/vnd.ms-excel"
   Response.ContentEncoding = System.Text.Encoding.Unicode
5 Response.Write(_DataStringWriter) 输出Html流
   Response.End()
以上已经可以实现将数据导入到Excel表格，如果需要导入Word则Response.ContentType = "application/vnd.ms-excel"中改为Response.ContentType = "application/vnd.ms-word"即可。但是注意将fileName也应随之改变，XX.xls或者XX.doc

方法三：datatable导出

该方法是response一行一行导出的，你可以根据自己的需求添加相应的行。

/// <summary>
    /// DataTable中的数据导出到Excel并下载
    /// </summary>
    /// <param name="dt">要导出的DataTable</param>
    /// <param name="FileType">类型</param>
    /// <param name="FileName">Excel的文件名</param>
    public void CreateExcel(DataTable dt, string FileType, string FileName)
    {
        Response.Clear();
        Response.Charset = "UTF-8";
        Response.Buffer = true;
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        Response.AppendHeader("Content-Disposition", "attachment;filename="" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls"");
        Response.ContentType = FileType;
    </span><span style="color: rgba(0, 0, 255, 1)">string</span> colHeaders = <span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)">.Empty;
    </span><span style="color: rgba(0, 0, 255, 1)">string</span> ls_item = <span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)">.Empty;
    DataRow[] myRow </span>=<span style="color: rgba(0, 0, 0, 1)"> dt.Select();
    </span><span style="color: rgba(0, 0, 255, 1)">int</span> i = <span style="color: rgba(128, 0, 128, 1)">0</span><span style="color: rgba(0, 0, 0, 1)">;
    </span><span style="color: rgba(0, 0, 255, 1)">int</span> cl =<span style="color: rgba(0, 0, 0, 1)"> dt.Columns.Count;
    </span><span style="color: rgba(0, 0, 255, 1)">foreach</span> (DataRow row <span style="color: rgba(0, 0, 255, 1)">in</span><span style="color: rgba(0, 0, 0, 1)"> myRow)
    {
        </span><span style="color: rgba(0, 0, 255, 1)">for</span> (i = <span style="color: rgba(128, 0, 128, 1)">0</span>; i &lt; cl; i++<span style="color: rgba(0, 0, 0, 1)">)
        {
            </span><span style="color: rgba(0, 0, 255, 1)">if</span> (i == (cl - <span style="color: rgba(128, 0, 128, 1)">1</span><span style="color: rgba(0, 0, 0, 1)">))
            {<br>//到头换行
                ls_item </span>+= row[i].ToString() + <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">
</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;
            }
            </span><span style="color: rgba(0, 0, 255, 1)">else</span><span style="color: rgba(0, 0, 0, 1)">
            {<br>//换格
                ls_item </span>+= row[i].ToString() + <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">	</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;
            }
        }
        </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">一行一行的写入</span>

            Response.Output.Write(ls_item);

ls_item = string.Empty;

}
    Response.Output.Flush();
    Response.End();
}</span></pre>