ClickOnce Applications Fail to Update

Question

We have a .NET 4.8 WPF application deployed to a couple hundred desktops using ClickOnce published from Visual Studio 2019. Mot of the desktops are Windows 10. A very large percentage of the time the update fails. We found this article that describes it perfectly and the work-around works.

https://learn.microsoft.com/en-us/troubleshoot/dotnet/framework/clickonce-application-fails-update

Problem is this happens ALL THE TIME. Lately, we've been doing an update every day. We can find no rhyme or reason to it. Having our users in various offices deleting their app cache is crazy! It's become untenable. We've used ClickOnce with many clients over the years and never had this occur. Now it happens every day. Can't find any way to troubleshoot it.

Thanks in advance!
Mike

Answer 1

@Mike Yeager , If you don't want to delete the app cache manually, I recommend that you could write the code to delete the files in advance.

Code:

  if (System.Deployment.Application.ApplicationDeployment.IsNetworkDeployed)  
            {  
                string path = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + "\\" + "AppData\\Local\\Apps\\2.0";//Get file cache path  
                MessageBox.Show(path);               //check if path is correct  
                System.IO.DirectoryInfo di = new DirectoryInfo(path);  
                foreach (FileInfo file in di.GetFiles())  
                {  
                    file.Delete();                    //delete all files  
                }  
                foreach (DirectoryInfo dir in di.GetDirectories())  
                {  
                    dir.Delete(true);                //delete all folders  
                }  
  
            }  

You could put the above code in the Window_Load event.

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