进度指示器采用FileUpload控件 [英] Progress Indicator With FileUpload control

问题描述

我有一个网页，我希望人们能够上传内容。 （只会有一小部分人数量使用它，因为它是访问的限制，所以我不太担心任何DOS类型的攻击。）

I have a web page which I want people to be able to upload content to. (There will only be a small number of people using it, as it is access restricted, so I'm not too worried about any DOS type attacks.)

我使用一个FileUpload控件做到这一点：

I'm using a fileUpload control to do this:

protected void Button1_Click(object sender, EventArgs e)
    {
        if (fileUploader.HasFile)
        try {
          fileUploader.SaveAs(Server.MapPath("Uploads\\") + fileUploader.FileName);
          errorMessage.Text = "File name: " +
               fileUploader.PostedFile.FileName + "<br>" +
               fileUploader.PostedFile.ContentLength + " kb<br>";
        }
        catch (Exception ex) {
          errorMessage.Text = "ERROR: " + ex.Message.ToString();
        }
        else
        {
           errorMessage.Text = "You have not specified a file.";
        } 
    }

该文件可以达到50MB（我已经改变了web.config中允许此）。我的问题是，随着大型文件的用户无法看到的上传的进展。

The files can be up to 50MB (I have changed the web.config to allow this). The problem I have is that with large files the user can't see the progress of the upload.

我想知道我怎么能在页面上显示进度，使用户可以看到正在发生的事情。没有大惊小怪任何幻想 - 只要是这样的：

I want to know how I can display the progress on the page so the user can see something is happening. Not fussed about anything fancy - just something like:

的字节上传/总字节数的

就可以了。我可以用postedFile.ContentLength得到的总字节数，但不知道如何获得字节上传

would be fine. I can get the total bytes using postedFile.ContentLength, but don't know how to get the bytes uploaded.

此外 - 我能够刷新屏幕上传正在发生

Also - am I able to refresh the screen as the upload is taking place?

干杯，

本

推荐答案

这答案不是特定于ASP ...

This answer is not specific to ASP...

一个文件上传通常是通过一个 HTTP POST 要求与内容类型做>。这包括在请求体的部分中的一个的文件主体。

A file upload is typically done by making an HTTP POST request with Content-type: multipart/form-data. This includes the file body in one of the parts of the request body.

因此​​，一个特定的浏览器选项卡中，只能有在给定时间一个页面加载。简短的回答是，除非你是iframe（一个状态，一个用于上传），您将无法显示状态。真正看中

So within a given browser tab, there can only be one page loading at a given time. The short answer is, unless you get really fancy with iframes (one for status, one for upload), you will not be able to show the status.

然而，如果使用闪光灯，你可以。 http://www.uploadify.com/ 是一个伟大的小前端插件（jQuery的），它允许用户可以选择多个文件，并上传所有这些，显示沿途的状态。我只是它插入限制上传到64M的网站。工程真棒。

However, if you use Flash, you can. http://www.uploadify.com/ is a great little front-end plugin (for jQuery) which allows the user to select multiple files, and uploads them all, showing the status along the way. I just plugged it into a site that limits uploads to 64M. Works awesome.

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