Question

我有这个C＃代码不能完成这项工作。下载完成后，此代码应运行代码。但它不起作用。

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
    {               
    }
}

这是无效的代码

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，但它无效，所以我需要有关此代码的帮助。

Answer 1

查看文档，DownloadFile()是同步的，因此不需要回调。请改为尝试：

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/");
}

这应该足够了。

下载未调用完整事件处理程序

1 个答案: