下载完整的活动处理程序未被调用

Question

我有此C＃代码无法完成工作。下载完成后，该代码应运行代码。但它行不通。

代码：

private void DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
    ZipFile.ExtractToDirectory("web/data/main/web.zip", "web/");
}
private void flatToggle2_CheckedChanged(object sender)
{
    if (flatToggle2.Checked)
    {
        //Create File
        Directory.CreateDirectory("web/data/main/");
        timer2.Start();
        bunifuProgressBar1.Show();
        bunifuCustomLabel1.Show();
        //Downloand
        using (var client = new WebClient())
        {
            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadFileCompleted);
            client.DownloadFile("https://www.apachelounge.com/download/VC15/binaries/httpd-2.4.29-Win64-VC15.zip", "web/data/main/web.zip");
        }
    }
    else
    {               
    }
}

这是不起作用的代码

private void DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
    ZipFile.ExtractToDirectory("web/data/main/web.zip", "web/");
}

我尝试在没有解压缩的情况下运行此代码，但它不起作用，因此我需要此代码的帮助。

Answer 1

查看文档，DownloadFile()是同步的，因此无需回调。相反尝试：

using (var client = new WebClient())
{
    client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadFileCompleted);
    client.DownloadFile("https://www.apachelounge.com/download/VC15/binaries/httpd-2.4.29-Win64-VC15.zip", "web/data/main/web.zip");
    ZipFile.ExtractToDirectory("web/data/main/web.zip", "web/");
}

这应该就足够了。