通过WebBrowser控件下载文件 [英] Download a file through the WebBrowser control

问题描述

我在表单上有一个WebBrowser控件，但大部分内容对用户来说都是隐藏的。它是处理一系列登录和其他任务。我必须使用此控件，因为有大量的Javascript可以处理登录。 （即，我不能切换到WebClient对象。）

在跳过一点之后，我们最终想要下载一个PDF文件。而不是下载，该文件显示在webBrowser控件中，用户看不到。

如何下​​载PDF而不是在浏览器中加载控制？

解决方案

将一个SaveFileDialog控件添加到表单中，然后在WebBrowser的导航事件中添加以下代码：

  private void webBrowser1_Navigating（object sender，WebBrowserNavigatingEventArgs e）
 {
 if（e.Url.Segments [e.Url .Segments.Length  -  1] .EndsWith（。pdf））
 {
 e.Cancel = true; 
 string filepath = null; 
 
 saveFileDialog1.FileName = e.Url.Segments [e.Url.Segments.Length  -  1]; 
 if（saveFileDialog1.ShowDialog（）== DialogResult.OK）
 {
 filepath = saveFileDialog1.FileName; 
 WebClient client = new WebClient（）; 
 client.DownloadFileCompleted + = new AsyncCompletedEventHandler（client_DownloadFileCompleted）; 
 client.DownloadFileAsync（e.Url，filepath）; 
} 
} 
} 
  

//回调函数

  void client_DownloadFileCompleted（object sender，AsyncCompletedEventArgs e）
 {
 MessageBox.Show（File downloaded）; 
} 
  

资料来源： http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/d338a2c8-96df- 4cb0-b8be-c5fbdd7c9202

I have a WebBrowser control on a form, but for the most part it remains hidden from the user. It is there to handle a series of login and other tasks. I have to use this control because there is a ton of Javascript that handles the login. (i.e., I can't just switch to a WebClient object.)

After hopping around a bit, we end up wanting to download a PDF file. But instead of downloading, the file is displayed within the webBrowser control, which the user can not see.

How can I download the PDF instead of having it load in the browser control?

解决方案

Add a SaveFileDialog control to your form, then add the following code on your WebBrowser's Navigating event:

private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
    if (e.Url.Segments[e.Url.Segments.Length - 1].EndsWith(".pdf"))
    {
        e.Cancel = true;
        string filepath = null;

        saveFileDialog1.FileName = e.Url.Segments[e.Url.Segments.Length - 1];
        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            filepath = saveFileDialog1.FileName;
            WebClient client = new WebClient();
            client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
            client.DownloadFileAsync(e.Url, filepath);
        }
    }
}

//Callback function

void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
    MessageBox.Show("File downloaded");
}

Source: http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/d338a2c8-96df-4cb0-b8be-c5fbdd7c9202

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