无法取消具有异步等待的 wix 安装自定义操作

问题描述

我有一个自定义操作，可以下载一个大文件（~800MB）；为了显示下载进度，我将此操作设为 async-await。

但是在 Wix UI 中点击“取消”时，只有在下载完整文件后，安装才会被取消。

有没有办法在用户取消安装后立即取消它？

CustomAction.cs

public class CustomActions
{
        [CustomAction]
        public static ActionResult DownloadImage(Session session)
        {
            InstallerLog.Log(session,"DownloadImage","Entry Point :",InstallerLog.LoggerLevel.Info);
            string url = session["DOWNLOAD_URL"];
            string fileName = Path.GetFileName(new UriBuilder(url).Path);
            string downloadpath = "SomePath";
            string downloadFile = Path.Combine(downloadpath,fileName);

            try
            {
                DownloadImageFile DIF = new DownloadImageFile(session);
                DIF.DownloadFile(url,downloadFile);
            }
            catch (Exception exc)
            {
                InstallerLog.Log(session,"Error: " + exc.Message,InstallerLog.LoggerLevel.Error);
                session.Message(InstallMessage.Error,new Record { FormatString = exc.Message });
                return ActionResult.Failure;
            }
            return ActionResult.Success;
}

class DownloadImageFile
    {
        private volatile bool _completed;
        private Session session;

        public DownloadImageFile(Session sess)
        {
            session = sess;
        }

        public void DownloadFile(string address,string location)
        {
            WebClient client = new WebClient();
            Uri Uri = new Uri(address);
            _completed = false;
            InstallerLog.Log(session,"DownloadFile","Starting file download");

            client.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);

            client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgress);
            client.Headers.Add("User-Agent","Mozilla/4.0 (compatible; MSIE 8.0)");
            client.DownloadFileAsync(Uri,location);

            while (client.IsBusy) { } // THIS BLOCKS MY THREAD
        }

        public bool DownloadCompleted { get { return _completed; } }

        public static double prevIoUsBytes = 0;
        private void DownloadProgress(object sender,DownloadProgressChangedEventArgs e)
        {
            if (((double)e.BytesReceived - prevIoUsBytes) / e.TotalBytesToReceive * 100 > 0.5)
            {
                prevIoUsBytes = e.BytesReceived;
                InstallerLog.Log(session,"File downloaded: " + e.Progresspercentage + "%");
            }
        }

        private void Completed(object sender,AsyncCompletedEventArgs e)
        {
            if (e.Cancelled == true) // THIS IS NEVER CALLED
            {
                InstallerLog.Log(session,"Download has been canceled");
            }
            else if (e.Error != null)
            {
                InstallerLog.Log(session,"Error encountered while downloading image file:" + e.Error.ToString());
            }
            else
            {
                InstallerLog.Log(session,"Download completed");
            }

            _completed = true;
        }
    }

我的 Product.wxs 的 CA 条目为：

<CustomAction Id="DownloadImageCA" Impersonate="yes" BinaryKey="PreConBin" DllEntry="DownloadImage" Return="check" Execute="immediate" />

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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