ClickOnce 3.5 and .NET 4.0 problems

Last week we discovered some strange behavior in the ClickOnce implementation for Visual Studio 2010.

We created a clickonce setup from the Visual Studio 2010 command line by using

msbuild /target:publish

This created a setup file, an application manifest and all the required files as you should expect. Important to notice is that it’s a Visual Studio 2010 solution but we are compiling against the .NET 3.5 framework(Target=.NET 3.5).

If we try to install this ClickOnce application on a system that does not have .NET 4.0 installed everything works.

However when we try to install the application on a .NET 4.0 system, the installation blows up with following error:

* Activation of \\dev\test.application resulted in exception. Following failure messages were detected:

+ Deployment manifest is not semantically valid.

+ Deployment manifest is missing <compatibleFrameworks>.

This error is telling us that the manifest file is not correct as the <compatibleFrameworks> section is missing in the XML file. This section is a required section for a .NET 4.0 manifest but NOT for a .NET 3.5 manifest. As this application is a .NET 3.5 application, he shouldn’t complain.

It seems like a .NET 4.0 system incorrectly assumes that it has to install the application by using the .NET 4.0 clickonce system.

Strange thing is that if we create the build by using the Publish properties inside the Visual Studio 2010 IDE, everything works. This is especially annoying because we use the same functionality on our build server to automatically create our application packages.

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.

.NET 9 - Goodbye sln!

Although the csproj file evolved and simplified a lot over time, the Visual Studio solution file (.sln) remained an ugly file format full of magic GUIDs. With the latest .NET 9 SDK(9.0.200), we finally got an alternative; a new XML-based solution file(.slnx) got introduced in preview. So say goodbye to this ugly sln file: And meet his better looking slnx brother instead: To use this feature we first have to enable it: Go to Tools -> Options -> Environment -> Preview Features Check the checkbox next to Use Solution File Persistence Model Now we can migrate an existing sln file to slnx using the following command: dotnet sln migrate AICalculator.sln .slnx file D:\Projects\Test\AICalculator\AICalculator.slnx generated. Or create a new Visual Studio solution using the slnx format: dotnet new sln --format slnx The template "Solution File" was created successfully. The new format is not yet recognized by VSCode but it does work in Jetbr...

The art of simplicity

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