asp.net 服务端调用客户端脚本; asp.net 服务端将文件传给客户端; reponse.ContentType的取值;用OutputStream.Write返回文件,效率是WriteFile的10倍;download link click和OutputStream的比较;

服务端

 ScriptManager.RegisterStartupScript(this, this.GetType(), "JSFunction", "clickAWord();", true);

客户端：

<script type="text/jacascript">
  function clickAWord()
 {
      alert("Hello World");
     document.getElementById("tempA").click(); //触发A元素的click事件,跨浏览器
 }
</script>

二、asp.net 服务端将文件传给客户端

  Response.Redirect(fileName);  //来自codeproject, whole EnglishSearch

三、repsonse.ContentType的可能取值

<?xml version="1.0" encoding="utf-8" ?>
<!--
   Inernet Media Types
   http://en.wikipedia.org/wiki/Internet_media_type
-->
<mediaTypes>
   <mediaType>
      <contentType>application/vnd.ms-excel</contentType>
      <name>Microsoft Excel (tm)</name>
      <refUrl>http://www.iana.org/assignments/media-types/application/vnd.ms-excel</refUrl>
      <fileExtensions>
         <fileExtension>.xls</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>application/msword</contentType>
      <name>Microsoft Word</name>
      <refUrl>http://www.iana.org/assignments/media-types/application/msword</refUrl>
      <fileExtensions>
         <fileExtension>.doc</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>application/vnd.ms-powerpoint</contentType>
      <name>Microsoft Powerpoint (tm)</name>
      <refUrl>http://www.iana.org/assignments/media-types/application/vnd.ms-powerpoint</refUrl>
      <fileExtensions>
         <fileExtension>.ppt</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>application/pdf</contentType>
      <name>Portable Document Format</name>
      <refUrl>http://www.iana.org/assignments/media-types/application/vnd.ms-powerpoint</refUrl>
      <fileExtensions>
         <fileExtension>.pdf</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>image/jpeg</contentType>
      <name>JPEG JFIF image</name>
      <fileExtensions>
         <fileExtension>.jpg</fileExtension>
         <fileExtension>.jpeg</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>image/gif</contentType>
      <name>GIF image</name>
      <fileExtensions>
         <fileExtension>.gif</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>image/vnd.microsoft.icon</contentType>
      <name>ICO image</name>
      <refUrl>http://www.iana.org/assignments/media-types/image/vnd.microsoft.icon</refUrl>
      <fileExtensions>
         <fileExtension>.ico</fileExtension>
      </fileExtensions>
   </mediaType>
   <mediaType>
      <contentType>application/zip</contentType>
      <name>ZIP file</name>
      <refUrl>http://www.iana.org/assignments/media-types/application/zip</refUrl>
      <fileExtensions>
         <fileExtension>.zip</fileExtension>
      </fileExtensions>
   </mediaType>
</mediaTypes>

 四、用OutputStream.Write返回文件,效率是WriteFile的10倍

 txtReport:文件的路径

 byte[] arByteFile=File.ReadAllBytes(txtReport);
            using (MemoryStream ms = new MemoryStream(arByteFile))
            {
                long dataLengthToRead = ms.Length;
                int blockSize = dataLengthToRead >= 5000 ? 5000 : (int)dataLengthToRead;
                byte[] buffer = new byte[dataLengthToRead];
                
                context.Response.Clear();
                
                // Clear the content of the response
                context.Response.ClearContent();
                context.Response.ClearHeaders();
                
                // Buffer response so that page is sent
                // after processing is complete.
                context.Response.BufferOutput = true;
                
                // Add the file name and attachment,
                // which will force the open/cance/save dialog to show, to the header
                context.Response.AddHeader("Content-Disposition", "attachment; filename=导入报告.txt" );


                // bypass the Open/Save/Cancel dialog
                //Response.AddHeader("Content-Disposition", "inline; filename=" + doc.FileName);


                // Add the file size into the response header
                context.Response.AddHeader("Content-Length", arByteFile.Length.ToString());

                // Set the ContentType
                context.Response.ContentType = "application/octet-stream";

                // Write the document into the response
                while (dataLengthToRead > 0 && context.Response.IsClientConnected)
                {
                    Int32 lengthRead = ms.Read(buffer, 0, blockSize);
                    context.Response.OutputStream.Write(buffer, 0, lengthRead);
                    context.Response.Flush();
                    dataLengthToRead = dataLengthToRead - lengthRead;
                }
                context.Response.Flush();
                context.Response.Close();
            }
            context.Response.End();  

 //.net response header

五、download link click和OutputStream的比较;

方式1: 服务端Output.Stream.Write(byte[]) //以二进制流返回要下载的文件

方式2:服务端返回文件的uri,客户端ajax接收后, <a id="tempA">; tempA.href=url; temA.click() ;实现下载；

       方式2的<a>叫download link。 href=*.xls,*.doc,*.zip 都会弹出下载对话框。

                                                 href=*.txt, 则会使当前页的内容变成txt的内容. 这就是downloadLink的局限性。