会话 ID 未在 Asp.net 中返回

Question

我正在尝试使用 plupload JqueryUI Widget 上传器并尝试使用会话 ID 上传图像，并且它保存在相应的会话 ID 下，但是当在 completeAll（即我绑定它们时）事件时，我试图使用相同的会话显示它们的文件名ID 没有发生。

谁能告诉我我做错了什么？

这是我的代码：

       <script type="text/javascript">
                 $(function () {
           $("#uploader").plupload({
               runtimes: 'gears,flash,silverlight,browserplus,html5',
               url: 'upload.aspx',
               max_file_size: '10mb',
               chunk_size: '1mb',
               unique_names: true,

               // Resize images on clientside if we can
               resize: { width: 320, height: 240, quality: 90 },

               // Specify what files to browse for
               filters: [
            { title: "Image files", extensions: "jpg,gif,png" },
            { title: "Zip files", extensions: "zip" }
        ],

               // Flash settings
               flash_swf_url: 'js/plupload.flash.swf',

               // Silverlight settings
               silverlight_xap_url: 'js/plupload.silverlight.xap'
           });


           // Client side form validation
           $('form').submit(function (e) {
               var uploader = $('#uploader').plupload('getUploader');

               // Files in queue upload them first
               if (uploader.files.length > 0) {
                   // When all files are uploaded submit form
                   uploader.bind('StateChanged', function () {
                       if (uploader.files.length === (uploader.total.uploaded + uploader.total.failed)) {
                           $('form')[0].submit();
                       }
                   });

                   uploader.start();
               } else
                   alert('You must at least upload one file.');

               return false;
           });

           var uploader = $('#uploader').plupload('getUploader');
           uploader.bind('FileUploaded', function (up, file, res) {
             $('#showfilelist').append("<div id=" + file.id + "><a href='uploads/" & Session("ID") &  "/" + file.name + "'><br>" + file.name + "</div>");

           });
       });
</script>

这里是处理程序文件：

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If IsNothing(Request.Form("chunk")) = False Then
        If Session("ID") Is Nothing Then
            Session("ID") = Guid.NewGuid.ToString
            IO.Directory.CreateDirectory(Server.MapPath("uploads/" & Session("ID")))
        End If
        Dim chunk As Integer = Request.Form("chunk")
        Dim chunks As Integer = Request.Form("chunks")
        Dim filename As String = Request.Form("name")
        If chunk = 0 Then
            Request.Files(0).SaveAs(Server.MapPath("uploads/") & Session("ID") & "/" & Request.Files(0).FileName)
        Else
            Dim OutputStream As New IO.FileStream(Server.MapPath("uploads/") & Session("ID") & "/" & Request.Files(0).FileName, IO.FileMode.Append)
            Dim InputBytes(Request.Files(0).ContentLength) As Byte
            Request.Files(0).InputStream.Read(InputBytes, 0, Request.Files(0).ContentLength)
            OutputStream.Write(InputBytes, 0, InputBytes.Length - 1)
            OutputStream.Close()
        End If
    End If
End Sub

在此处显示文件名：

<div id="showfilelist">
    </div>

Answer 1

我必须承认我不是那么熟悉 plupload。但是在 Uploadify 中，没有回传 session id 的原因是 flash 没有回传 session cookie。

SORRY EDIT（新链接，旧链接存在安全漏洞）

这里有一些可以帮助你的东西：

Uploadify ashx file Context.Session gets null

Answer 2

我不熟悉 plupload，但我发现您的 javascript 中肯定存在问题。检查这个特定的片段：

var uploader = $('#uploader').plupload('getUploader');
uploader.bind('FileUploaded', function (up, file, res) {
     $('#showfilelist').append("<div id=" + file.id + "><a href='uploads/" & Session("ID") &  "/" + file.name + "'><br>" + file.name + "</div>");
});

代码部分，即+ "><a href='uploads/" & Session("ID") & "/" + 不是有效的 java 脚本代码。除了不正确的& 运算符之外，您无法真正在客户端访问服务器端会话。

我相信正确的解决方案将包括在您的处理程序的响应中返回您的服务器端 ID (Session("ID"))。您可能可以通过FileUploaded 事件处理程序的res 参数访问响应。