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I have been facing the error below and have been following the main threads on Google. I've tried to delete the obj and bin folders and Rebuild the project, also updated Visual Studio, but I was not successful. Thanks for all of you that can help. Error:CS0579 Duplicate 'global::System.Runtime.Versioning.TargetFrameworkAttribute' attribute KilnDesktopApp C:\Users\xxx\Desktop\Kiln-Desktop-App\obj\Debug.NETFramework,Version=v4.7.2.AssemblyAttributes.cs
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Sounds like you have both an AssemblyInfo.cs file and possibly have enabled auto-generating the assemblyinfo file by the build. Please confirm you have not enabled the auto-generation of the assemblyinfo file, or alternatively ensure you don't have an AssemblyInfo.cs file as well.
Thanks Michael. I have the AssemblyIndo.cs file in my project and the only option I see related to auto-generating the assemblyinfo file is what is inside the project Properties > Build tab (picture attached). I have changed that from "Auto" to "Off" and kept the file in the project, and also tried another scenario deleting the AssemblyIndo.cs file from the project and choosing "Auto". I cleaned and rebuilt the project but I was not successful with any of those options. Thanks a lot if you or anyone else have any other suggestions.
The serialization assembly setting does not impact the assemblyinfo options. Put it back to Auto.
Open the project file using a text editor and look for the GenerateAssemblyInfo property. If it is there and set to true then set it to false.
Thanks a lot Michael. I've just done that and it seems that the project file does not have the GenerateAssemblyInfo property. I guess it can be easily added there, right? If so, where is the appropriate place to put it? I included the file here to make it easier. KilnDesktopApp.txt Thanks again.
Thank you for the contents. Unfortunately GenerateAssemblyInfo doesn't work with projects that aren't using the newer SDK format so that isn't an option for you at this point. It basically just eliminates the need for having an AssemblyInfo.cs file.
However I think I have identified the issue. In your project file there is a Compile line item for AssemblyAttributes.cs. You shouldn't have those lines as it is bringing in the file twice during compilation and causing the error you're seeing. Remove both lines in the project file that refer to AssemblyAttributes.cs then rebuild your solution.
Thanks Michael. I've just tried that and I got the error below:
error MSB4094: "bin\Debug\KilnDesktopApp.exe.manifest;obj\Release\KilnDesktopApp.exe.manifest" is an invalid value for the "InputManifest" parameter of the "GenerateApplicationManifest" task. Multiple items cannot be passed into a parameter of type "Microsoft.Build.Framework.ITaskItem". KilnDesktopApp
To be honest I think you have a lot of items in your project file that shouldn't be there. More specifically I can see lots of references to package files and files in the obj and bin directories. It looks like someone accidentally selected the option to show all files in Solution Explorer and then clicked the packages (and other folders) and said Include in Project. None of these should be necessary and I believe can be removed. I believe this is also applicable to the manifest files that were added but I don't know if your build is doing something extra with it.
Here is my attempt at cleaning some of this up. You should review the files you're referring in the project file. Content files, that should be copied to the output, should be either in the project folder or a subfolder but not in obj or bin. In the project file they should be marked as Content. This can be done in Solution Explorer by right-clicking the file and viewing the properties and setting the BUild Action to Content. In the file I updated I noticed there was a data.json file listed in the output directory but I couldn't find it anywhere else so you may need to add it back.
Also on review I notice that some of your images (e.g. green_chackmark.png) are not marked as content but others (e.g. green-led-off.png) are. If you're loading these images directly from disk then they need to be content. If you're using them as embedded resources then leave them as None.
I also noticed that you have embedded resources pointing to the obj folder. I removed them but because of the earlier content discussion you may be missing resources now. Review your Resources stuff in the designer and make sure all the resources you expect to be embedded are properly referenced.