Question

我有一个需要更新的ClickOnce应用程序。运行ApplicationDeployment.CurrentDeployment.CheckfForDetailedUpdate()将返回服务器上有可用更新的详细信息，并在服务器上获取应用程序的正确版本号。

当我运行UpdateAsync方法时，没有任何反应，程序会在无限循环中挂起，如代码所示。

可能出现什么问题？

这是代码

if (ApplicationDeployment.IsNetworkDeployed)
    if (ApplicationDeployment.CurrentDeployment.CheckForUpdate())
    {
        long downloaded = 0;
        bool write = false;
        bool updateCompleted = false;

        deployment.UpdateCompleted += (sender, e) => updateCompleted = true;
        deployment.UpdateProgressChanged += (sender, e) =>
        {
            //used to write to the log file the first time anything downloads
            if (downloaded == 0)
                write = true; 

            downloaded = e.BytesCompleted;
        };

        deployment.UpdateAsync();

        //suspend while updating
        while (!updateCompleted)
        {
            //write is never true implying that nothing gets downloaded
            if (write) 
            {
                log.Info(
                    "Downloaded " + downloaded + " bytes of " + total + ".");
                write = false;
            }
            Thread.Sleep(10);
        }
    }

Answer 1

我的猜测是你在while循环中阻塞主应用程序线程，UpdateCompleted正在等待你的主应用程序线程变为空闲，以便它可以运行。 MSDN文档支持这种猜测：

当异步更新完成或遇到异常时，ClickOnce将在主应用程序线程上引发UpdateCompleted事件。

ClickOnce异步更新无法正常工作

1 个答案: