Webbrowser Control搜索目录以避免下载重复项

问题描述：

是否可以利用使用Web浏览器控件时触发的事件并从站点下载文件?即，如果我转到7zip网站并尝试在另存为"对话框中单击确定"时尝试下载该软件的副本，则希望能够检查所选目录的副本已存在.我不是在询问我是否有处理的目录搜索部分，但我想利用该事件，用户已在其中选择了一个目录来保存文件.

Just PerdueIT

Is there a way to tap into the event that is triggered when using a web browser control and download a file from a site? i.e. If I go to the 7zip site and try to download a copy of the software when I hit ok on the save as dialog I want to be able to check the selected directory for a copy already existing. I'm not asking about the directory searching part of it that I have a handle on that but I want to tap into that event where the user has selected a directory to save the file in.

Just PerdueIT

答

Hi Just PerdueIT，

Hi Just PerdueIT,

如果要在WebBrowser控件中自定义文件下载过程，则可以注册导航事件并检查URL是否为文件下载URL.如果结果为是，则可以打开SaveFileDialog并执行所需的任何操作. 以下供您参考.

If you want to custom the process of file download in WebBrowser control, you could register Navigating event and check whether the URL is a file download URL. If the result is yes, you could open a SaveFileDialog and do anything what you want. Code below is for your reference.

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        webBrowser1.Navigating += WebBrowser1_Navigating;
        webBrowser1.Navigate("http://www.7-zip.org/download.html");
    }

    private void WebBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
    {
        if (IsDonwloadFileUrl(e.Url.Segments[e.Url.Segments.Length - 1]))
        {
            e.Cancel = true;
            string filepath = null;

            SaveFileDialog saveFileDialog1 = new SaveFileDialog();
            saveFileDialog1.FileName = e.Url.Segments[e.Url.Segments.Length - 1];
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                //You could write your code here to search or do other things
                filepath = saveFileDialog1.FileName;
                WebClient client = new WebClient();
                client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
                client.DownloadFileAsync(e.Url, filepath);
            }
        }
    }

    public static bool IsDonwloadFileUrl(string url)
    {
        List<string> fileExtensions = new List<string> { ".exe", ".pdf", ".doc", ".docx", ".txt" };
        foreach (var item in fileExtensions)
        {
            if (url.EndsWith(item))
            {
                return true;
            }
        }
        return false;
    }

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

最好的问候，
王丽

Best Regards,
Li Wang

Webbrowser Control搜索目录以避免下载重复项

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