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.NET Forum / Languages / C# / February 2008Console application checking if .NET installed
If .NET is not installed my console application pops up "the application failed to initialize properly" dialog. Can I programatically tell if .NET is installed, and pre-emp this message with my own ? thanks > If .NET is not installed my console application pops up "the application > failed to initialize properly" dialog. > Can I programatically tell if .NET is installed, and pre-emp this message > with my own ? My guess is that if you wrote that test code as .NET managed one, the machine should already have .NET installed for that code to be able to run. I think in order to test if .NET is installed, one should write an external native application that checks this somehow (maybe looking in the registry, or trying to run a .NET utility that returns the version of .NET) and somehow always run that before running the actual .NET console application. But this is only a guess, maybe I am missing something so don't take what I said for granted. Thanks. But I dont wish to have to write a calling app. I am definately looking for an in-line approach. B. >> If .NET is not installed my console application pops up "the application >> failed to initialize properly" dialog. [quoted text clipped - 9 lines] > application. But this is only a guess, maybe I am missing something so > don't take what I said for granted. Search the archives, I've recently posted a simple VBScript that you can run in order to detect whether .NET is installed. Willy. > Thanks. But I dont wish to have to write a calling app. I am definately > looking for an in-line approach. [quoted text clipped - 14 lines] >> application. But this is only a guess, maybe I am missing something so >> don't take what I said for granted. Thanks Willy. Your VBScript code checks the registry I think. I can check the regisry from my Console App, but if .NET is not is not installed then the same problem exists? Is this Catch 22? thanks > Search the archives, I've recently posted a simple VBScript that you can > run in order to detect whether .NET is installed. [quoted text clipped - 19 lines] >>> console application. But this is only a guess, maybe I am missing >>> something so don't take what I said for granted. > Thanks Willy. > [quoted text clipped - 3 lines] > > Is this Catch 22? Exactly, you can't use a .NET program to check whether .NET is installed. You need unmanaged code, and the easiest that comes to mind is a simple script (vbscript, jscript), Windows comes with the scripting engines installed by default. Willy. Its Catch 22 then. My app uses Managed code, and I dont wish to have 2 applications. Thanks to everyone, B >> Thanks Willy. >> [quoted text clipped - 10 lines] > > Willy. No need to write two applications, say you have a console application "someapp.exe", then you can simply make a command line script like this: @rem startapp.cmd @Echo off Set Version="HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727" reg query %version% /v Version >nul 2>nul if not %errorlevel% == 0 ( Echo No such .Net version: %Version% goto :end ) someapp.exe :end Willy. > Its Catch 22 then. My app uses Managed code, and I dont wish to have 2 > applications. [quoted text clipped - 15 lines] >> >> Willy. Thanks, but I need a wrapper free solution. I appreciate your help, B > No need to write two applications, say you have a console application > "someapp.exe", then you can simply make a command line script like this: [quoted text clipped - 31 lines] >>> >>> Willy. > Your VBScript code checks the registry I think. I can check the regisry from > my Console App, but if .NET is not is not installed then the same problem > exists? > > Is this Catch 22? It's catch 22 if you want to check it from managed code, yes - which is why Willy presented a VBScript answer (which therefore doesn't require .NET).  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk I always wondered why Microsoft didn’t just add support to the OS to be able to handle this situation more gracefully. For example, why can’t the OS somehow intercept the launching call and run some quick logic to see if the exe requires .Net? If the exe does require .Net and .Net is not installed then display a better and more informative message with website links and all… maybe even an option to install the .Net. Oh well. >> If .NET is not installed my console application pops up "the application >> failed to initialize properly" dialog. [quoted text clipped - 9 lines] > application. But this is only a guess, maybe I am missing something so > don't take what I said for granted. > I always wondered why Microsoft didn’t just add support to the OS to be able > to handle this situation more gracefully. [quoted text clipped - 19 lines] >> application. But this is only a guess, maybe I am missing something so >> don't take what I said for granted. Consider that the people not installing .NET might very well be some of the same people that never runs Windows Update, so they would never have this code that knew how to install .NET in the first place. SignatureLasse Vågsæther Karlsen mailto:lasse@vkarlsen.no http://presentationmode.blogspot.com/ PGP KeyID: 0xBCDEA2E3 > Consider that the people not installing .NET might very well be some of > the same people that never runs Windows Update, so they would never have > this code that knew how to install .NET in the first place. I can see your point, but .Net has bee around for a while, if Microsoft would have started doing something about this issue since the very beginning, *most* computer today would be able to handle this in a very graceful way. Yes I agree that there would always be a computer here or there that would not be able to handle this, when this happens you will get an email and tell the user how to fix the problem I guess. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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