笔记0624

1，现在，GridView中已经绑定了数据，接下来的任务就是导出到Excel。下面是button事件中的代码

Response.ClearContent();

Response.AddHeader("content-disposition", "attachment; filename=MyExcelFile.xls");

Response.ContentType = "application/excel";

StringWriter sw = new StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(sw);

gvUsers.RenderControl(htw);

Response.Write(sw.ToString());

Response.End();

并且还需要override一下VerifyRenderingInServerForm方法(这一点非常重要，否则在点击按钮后会报错，译者注)，代码如下:

public override void VerifyRenderingInServerForm(Control control)

{

}

 2.1

 public void ToExcel()//整个GRIDVIEW导出到EXCEL
    {
        string filename="网银终端" + DateTime.Now.ToString("yyyyMMdd") + ".xls";
        string style = @"<style> .text { mso-number-format:@; } </script> "; //解决第一位字符为零时不显示的问题
       
        this.GridView1.AllowPaging = false;
        this.GridView1.DataBind();

        filename = HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8);//解决导出EXCEL时乱码的问题
        Response.ClearContent;
       
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        Response.ContentType = "application/excel";
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename);

        System.IO.StringWriter sw = new System.IO.StringWriter();//定义一个字符串写入对象
        HtmlTextWriter htw = new HtmlTextWriter(sw);//将html写到服务器控件输出流
       
        this.GridView1.RenderControl(htw);//将控件GRIDVIEW中的内容输出到HTW中
        Response.Write(style);
        Response.Write(sw);
        Response.End();

        this.GridView1.AllowPaging = true;
    }

2.2

public void CreateExcel(DataSet ds, string FileName)//整个GRIDVIEW导出到EXCEL.xls
    {
        FileName=HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);//解决导出时文件名汉字显示乱码的问题

        HttpResponse resp;
        resp = Page.Response;
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
        string colHeaders = "", ls_item = "";

        //定义表对象与行对象，同时用DataSet对其值进行初始化
        DataTable dt = ds.Tables[0];
        DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的
        int i = 0;
        int cl = dt.Columns.Count;

        //取得数据表各列标题，各标题之间以t分割，最后一个列标题后加回车符
        for (i = 0; i < cl; i++)
        {
            if (i == (cl - 1))//最后一列，加n
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "
";
            }
            else
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "	";
            }

        }
        resp.Write(colHeaders);
        //向HTTP输出流中写入取得的数据信息

        //逐行处理数据  
        foreach (DataRow row in myRow)
        {
            //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据    
            for (i = 0; i < cl; i++)
            {
                if (i == (cl - 1))//最后一列，加n
                {
                    ls_item += row[i].ToString() + "
";
                }
                else
                {
                    ls_item += row[i].ToString() + "	";
                }

            }
            resp.Write(ls_item);
            ls_item = "";

        }
        resp.End();
    }

 2.3

GridView导入excel中代码很简单的如

 protected void ExportExcel(object sender, EventArgs e)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
        Response.Charset = "gb2312";
        Response.ContentType = "application/vnd.xls";
        System.IO.StringWriter stringWrite = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
        this.GridData.AllowPaging = false;
        BindData();//数据绑定
        this.GridData.RenderControl(htmlWrite);
        Response.Write(stringWrite.ToString());
        Response.End();

     this.GridData.AllowPaging = true;

BindData();//数据绑定

}

 //

2.4Response中的Clear(),ClearContent(),ClearHeaders() 方法

Response.Clear()方法 Clear方法删除所有缓存中的HTML输出。但此方法只删除Response显示输入信息，不删除Response头信息。 Response.ClearContent()方法 ClearContent与Clear方法区别就是ClearContent方法不仅删除Response显示输出信息而且还删除Response头信息

Response.ClearHeaders()方法 ClearHeaders方法只删除头信息，而不删除Response显示输出信息

2.5 Response.AddHeader

Response.AddHeader使用实例

1.文件下载，指定默认名

Response.AddHeader("content-type","application/x-msdownload");

Response.AddHeader("Content-Disposition","attachment;filename=文件名.rar");

2.刷新页面

Response.AddHeader (“REFRESH”, ”60;URL=newpath/newpage.asp”)

这等同于客户机端<META>元素：

<META HTTP-EQUIV=”REFRESH”, “60;URL=newpath/newpage.asp”>

3.页面转向

Response.Status = “302 Object Moved”

Response.Addheader “Location”, “newpath/newpage.asp”

这等同于使用Response.Redirect方法：

Response.Redirect “newpath/newpage.asp”

4.强制浏览器显示一个用户名/口令对话框

Response.Status= “401 Unauthorized”

Response.Addheader “WWW-Authenticate”, “BASIC”

强制浏览器显示一个用户名/口令对话框，然后使用BASIC验证把它们发送回服务器（将在本书后续部分看到验证方法）。

5.如何让网页不缓冲

Response.Expires = 0

Response.ExpiresAbsolute = Now() - 1

Response.Addheader "pragma","no-cache"

Response.Addheader "cache-control","private"

Response.CacheControl = "no-cache

 

2.5 Response.ContentType 详细列表

不同的ContentType 会影响客户端所看到的效果.默认的ContentType为 text/html 也就是网页格式.
代码如:

<% response.ContentType ="text/html" %> 
<!--＃i nclude virtual="/ContentType.html" -->

显示的为网页,而

<% response.ContentType ="text/plain" %> 
<!--＃i nclude virtual="/sscript/ContentType.html" -->

则会显示html原代码.

以下为一些常用的 ContentType
GIF images 

<% response.ContentType ="image/gif" %> 
<!--＃i nclude virtual="/myimage.gif" -->

JPEG images 

<% response.ContentType ="image/jpeg" %> 
<!--＃i nclude virtual="/myimage.jpeg" -->

TIFF images 

<% response.ContentType ="image/tiff" %> 
<!--＃i nclude virtual="/myimage.tiff" -->

MICROSOFT WORD document 

<% response.ContentType ="application/msword" %> 
<!--＃i nclude virtual="/myfile.doc" -->

RTF document 

<% response.ContentType ="application/rtf" %> 
<!--＃i nclude virtual="/myfile.rtf" -->

MICROSOFT EXCEL document 

<% response.ContentType ="application/x-excel" %> 
<!--＃i nclude virtual="/myfile.xls" -->

MICROSOFT POWERPOINT document 

<% response.ContentType ="application/ms-powerpoint" %> 
<!--＃i nclude virtual="/myfile.pff" -->

PDF document 

<% response.ContentType ="application/pdf" %> 
<!--＃i nclude virtual="/myfile.pdf" -->

ZIP document 

<% response.ContentType ="application/zip" %> 
<!--＃i nclude virtual="/myfile.zip" -->

下面是更详细的ContentType
'ez' => 'application/andrew-inset', 
'hqx' => 'application/mac-binhex40', 
'cpt' => 'application/mac-compactpro', 
'doc' => 'application/msword', 
'bin' => 'application/octet-stream', 
'dms' => 'application/octet-stream', 
'lha' => 'application/octet-stream', 
'lzh' => 'application/octet-stream', 
'exe' => 'application/octet-stream', 
'class' => 'application/octet-stream', 
'so' => 'application/octet-stream', 
'dll' => 'application/octet-stream', 
'oda' => 'application/oda', 
'pdf' => 'application/pdf', 
'ai' => 'application/postscript', 
'eps' => 'application/postscript', 
'ps' => 'application/postscript', 
'smi' => 'application/smil', 
'smil' => 'application/smil', 
'mif' => 'application/vnd.mif', 
'xls' => 'application/vnd.ms-excel', 
'ppt' => 'application/vnd.ms-powerpoint', 
'wbxml' => 'application/vnd.wap.wbxml', 
'wmlc' => 'application/vnd.wap.wmlc', 
'wmlsc' => 'application/vnd.wap.wmlscriptc', 
'bcpio' => 'application/x-bcpio', 
'vcd' => 'application/x-cdlink', 
'pgn' => 'application/x-chess-pgn', 
'cpio' => 'application/x-cpio', 
'csh' => 'application/x-csh', 
'dcr' => 'application/x-director', 
'dir' => 'application/x-director', 
'dxr' => 'application/x-director', 
'dvi' => 'application/x-dvi', 
'spl' => 'application/x-futuresplash', 
'gtar' => 'application/x-gtar', 
'hdf' => 'application/x-hdf', 
'js' => 'application/x-javascript', 
'skp' => 'application/x-koan', 
'skd' => 'application/x-koan', 
'skt' => 'application/x-koan', 
'skm' => 'application/x-koan', 
'latex' => 'application/x-latex', 
'nc' => 'application/x-netcdf', 
'cdf' => 'application/x-netcdf', 
'sh' => 'application/x-sh', 
'shar' => 'application/x-shar', 
'swf' => 'application/x-shockwave-flash', 
'sit' => 'application/x-stuffit', 
'sv4cpio' => 'application/x-sv4cpio', 
'sv4crc' => 'application/x-sv4crc', 
'tar' => 'application/x-tar', 
'tcl' => 'application/x-tcl', 
'tex' => 'application/x-tex', 
'texinfo' => 'application/x-texinfo', 
'texi' => 'application/x-texinfo', 
't' => 'application/x-troff', 
'tr' => 'application/x-troff', 
'roff' => 'application/x-troff', 
'man' => 'application/x-troff-man', 
'me' => 'application/x-troff-me', 
'ms' => 'application/x-troff-ms', 
'ustar' => 'application/x-ustar', 
'src' => 'application/x-wais-source', 
'xhtml' => 'application/xhtml+xml', 
'xht' => 'application/xhtml+xml', 
'zip' => 'application/zip', 
'au' => 'audio/basic', 
'snd' => 'audio/basic', 
'mid' => 'audio/midi', 
'midi' => 'audio/midi', 
'kar' => 'audio/midi', 
'mpga' => 'audio/mpeg', 
'mp2' => 'audio/mpeg', 
'mp3' => 'audio/mpeg', 
'aif' => 'audio/x-aiff', 
'aiff' => 'audio/x-aiff', 
'aifc' => 'audio/x-aiff', 
'm3u' => 'audio/x-mpegurl', 
'ram' => 'audio/x-pn-realaudio', 
'rm' => 'audio/x-pn-realaudio', 
'rpm' => 'audio/x-pn-realaudio-plugin', 
'ra' => 'audio/x-realaudio', 
'wav' => 'audio/x-wav', 
'pdb' => 'chemical/x-pdb', 
'xyz' => 'chemical/x-xyz', 
'bmp' => 'image/bmp', 
'gif' => 'image/gif', 
'ief' => 'image/ief', 
'jpeg' => 'image/jpeg', 
'jpg' => 'image/jpeg', 
'jpe' => 'image/jpeg', 
'png' => 'image/png', 
'tiff' => 'image/tiff', 
'tif' => 'image/tiff', 
'djvu' => 'image/vnd.djvu', 
'djv' => 'image/vnd.djvu', 
'wbmp' => 'image/vnd.wap.wbmp', 
'ras' => 'image/x-cmu-raster', 
'pnm' => 'image/x-portable-anymap', 
'pbm' => 'image/x-portable-bitmap', 
'pgm' => 'image/x-portable-graymap', 
'ppm' => 'image/x-portable-pixmap', 
'rgb' => 'image/x-rgb', 
'xbm' => 'image/x-xbitmap', 
'xpm' => 'image/x-xpixmap', 
'xwd' => 'image/x-xwindowdump', 
'igs' => 'model/iges', 
'iges' => 'model/iges', 
'msh' => 'model/mesh', 
'mesh' => 'model/mesh', 
'silo' => 'model/mesh', 
'wrl' => 'model/vrml', 
'vrml' => 'model/vrml', 
'css' => 'text/css', 
'html' => 'text/html', 
'htm' => 'text/html', 
'asc' => 'text/plain', 
'txt' => 'text/plain', 
'rtx' => 'text/richtext', 
'rtf' => 'text/rtf', 
'sgml' => 'text/sgml', 
'sgm' => 'text/sgml', 
'tsv' => 'text/tab-separated-values', 
'wml' => 'text/vnd.wap.wml', 
'wmls' => 'text/vnd.wap.wmlscript', 
'etx' => 'text/x-setext', 
'xsl' => 'text/xml', 
'xml' => 'text/xml', 
'mpeg' => 'video/mpeg', 
'mpg' => 'video/mpeg', 
'mpe' => 'video/mpeg', 
'qt' => 'video/quicktime', 
'mov' => 'video/quicktime', 
'mxu' => 'video/vnd.mpegurl', 
'avi' => 'video/x-msvideo', 
'movie' => 'video/x-sgi-movie', 
'ice' => 'x-conference/x-cooltalk' 

//---------------------下面是从资源文件获取图片。并显示
 public class GetImage
    {
        public static System.Drawing.Image GetSrc(string name)
        {
            System.Resources.ResourceManager rm = new ResourceManager("ClassLibrary.ResourceTestImg",
       System.Reflection.Assembly.GetExecutingAssembly());//ResourceTestImg为资源文件名称,ClassLibrary//为命名空间
            return rm.GetObject(name) as System.Drawing.Image;
        }
       
    }

显示代码
 protected void Page_Load(object sender, EventArgs e)
 {

            System.Drawing.Image img = ClassLibrary.GetImage.GetSrc("_15958260");
           //_15958260为在ResourceTestImg.resx资源管理窗口中看到资源图片名称
                     
            img.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}