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Microsoft Free

Transform xml and json files at build time based on configuration. Contains tooling to assist in the creation and previewing of transform files.

4.5 Star
Visual Studio
2017, 2015
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3 Star
by rostolator | October 20 2016

a link to the VS2015 compatible version would be very helpful .. oh thanks Mike (3 comments below)

5 Star
by CodeSourcerer | October 20 2016

5 Star
by Jürgen Bayer | September 09 2016

Works perfectly and is even better than the ASP.NET transformation since it transforms even when running the project in Visual Studio.

5 Star
by Mike DePouw | May 27 2016

For whatever reason, there's a new project for VS 2015.

3 Star
by Ondřej | May 11 2016

Looks extremely useful and exactly what I need, but it does not work in Visual Studio 2015 Community Update 2.

1 Star
by nkomp18 | May 11 2016

I am extremely frustrated with SlowCheetah.
I tried to use it in many occasions and it never quite worked for me.
The main problem is that I have multiple configurations like:
QA, UAT, PRD, Live, Local, DEV, etc and I want to be able to define those myself.
Attempting to change the configuration manager of the solution causes an array of problems that need hours to be resolved. Notably, the underlying projects will still not generate the new build configs, which leads to build problems, DLL issues and finally I can't get rid of Debug and Release configurations of which I don't want any configs to be generated.
Also if I add my configurations to the configuration manager,
How hard is it to let the user define these in a simple XML file?
Until this very simple feature is added, SlowCheetah is of no use to me and I assume many other developers

5 Star
by EvangelistaLion | May 10 2016

When work in VS 2015 please ?? Thank you

5 Star
by Bhuard | May 06 2016

Used it for SQL unit test app.config.


5 Star
by Dave_MEC | January 19 2016

This is an extension I can't live without. We use this in everyone of our applications. It should be added as part of Visual Studio going forward.

5 Star
by jmelllo | November 19 2015

5 Star
by DragonOfId | November 12 2015

This extension has made configuring console programs for multiple environments SO much easier. I have no idea why this functionality isn't native in VS!

5 Star
by George Birbilis | November 05 2015

see for VS2015

5 Star
by the real Tim Partridge | October 23 2015

Works as advertised. Downloaded, installed, restarted Visual Studio. Done

5 Star
by Toomas Talviste | September 23 2015

1 Star
by Kevin Landymore | September 15 2015

Doesn't work with a build controller. Useless for me sadly, these things should work "out of the box".

5 Star
by Richard M Lee | September 06 2015

Invaluable! A feature that should definitely be native to visual studio.

5 Star
by SabbirSpider | August 14 2015

Great Package.It reduces my lot of manual task for my windows application

5 Star
by sukhdeep.singh1 | July 31 2015

Great plugin, a life saver :)

5 Star
by ronnotel | July 18 2015

I've been coding large financial trading frameworks in VS/C# since .NET 1.1 days (12/13 years). From this perspective, I can affirmatively state that Slow Cheetah is by far the most productive package that is not currently integrated into the VS tool. I'm walking through a major rollout now involving five different staging environments and over twenty different server configs. Without Slow Cheetah, the other 35 people in the deployment team waiting on my builds would be left high and dry while I tried to manage the configs by hand. VS management - what the *hell* are you thinking? Integrate!

5 Star
by MGSman123 | June 30 2015

Excellent extension! Definitely essential to my VS toolbelt going forward. Works like a charm in VS2015 too. Just needed to tweak the vsextension xml inside the package :)

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  • Can you use SlowCheetah with the Wix harvesting feature
    2 Posts | Last post September 18, 2013
    • We are trying to use SlowCheetah with a Wix 3.7 installer project. When we try to use the Wix harvesting feature, the Wix build fails with the Heat error shown below. 
      We are new to SlowCheetah and also to Wix, so please accept our apologies if there is something obvious here that we are missing. Thanks in advance for any ideas and/or suggestions! 
      Here is the compile error received when we try to build the solution.
      Build error during harvesting: C:\Users\UserName\AppData\Local\Microsoft\MSBuild\SlowCheetah\v1\SlowCheetah.Transforms.targets(91,5): Could not open Transform file: Could not find file 'C:\Users\UserName\Desktop\Source\Applications\AppName\Branches\\NET\MonikerInstaller\app.Debug.config'.
    • Same problem here. Any ideas?
  • Bug in
    15 Posts | Last post September 09, 2013
    • Hi!
      Thanks for a great product, although it seems to be a bug in the latest version. When I compile I get an error MSB3030 that is telling me that my bin/debug/*.config could not be found. 
      If I uninstall SlowCheetah and manually removes the content in C:\Users\UserName\AppData\Local\Microsoft\MSBuild\SlowCheetah it compiles as expected.
      Anyways thanks again
    • I too am seeing this problem. Is there any fix short of uninstalling?
    • I'm also seeing this behavior.  Is it possible to roll back to the previous version until this gets fixed?
    • I'll add to that I am also experiencing the issue.
    • I too am getting this behavior.  My project builds just fine right up to the point that I add transforms.  As soon as those App.<build level>.config files are created, my app builds halt having only created the .vshost.* files in the bin folder.  Delete the transform files and the build can resume.  
      VS2010, SlowCheetah
    • More complicated than I first thought.  Messing with a new project, the tool works for me.  But I can't seem to get my existing application to get past the errors mentioned above.  
      I found the project in GitHub and I'm submitting an issue.
    • Sorry to hear you are having issues. Can you tell me: what types of projects have this issue and what version of VS are you using?
    • I'm using VS2012 Update 3 and see the problem with two WinForms apps. There isn't anything special about these two apps that I can see. Just run of the mill WinForms. I do have very simple usage of app.config transforms in both of these, literally one appsetting change in release mode and none in debug.
    • Any chance of someone sharing the project and source code for an impacted project? I am not able to reproduce this issue.
    • Microsoft Visual Studio Ultimate 2012
      Version 11.0.60610.01 Update 3
      Microsoft .NET Framework
      Version 4.5.50709
      Installed Version: Ultimate
      Doesn't seem to matter what project type.  Doesn't work on winform or wpf projects.
    • I was able to get it to work for specific projects by adding the 2.5.5 version of the nuget package to my project.  Prior to this version that broke things, I never used the nuget package and just used the vs extension.
    • I am using VS2012 Ultimate update 3. Project types: wpf, wcf and windows service.
    • Sayed, my two apps have too many dependencies and hooks into the larger solution to offer as a repro case. So I went and created a new WinForms app and cannot cause the problem, even with exactly the same config files and transforms. I'm not sure what to make of this. Clearly something is wrong in the two projects I have. If it helps any I am willing to offer you the project file itself, though it won't build of course due to the lack of dependencies.
    • Sayed, the most recent update has resolved this problem for me. Thank you so much, and thanks for the awesome product!
    • Also reporting that 2.5.8 has repaired the issue for me.  Thanks again.
  • Limit on default number of web.config transforms
    1 Posts | Last post September 09, 2013
    • Hi,
      Is there a limit on default number of web.config transforms that can be added. Beyond 11 transforms, I don't get the option to "Add Config Transforms" when I right click on web.config. I then have to create a transform manually and associate to the web.config.
      Another thing I noticed is that though I have more than 11 build configs defined, only 11 web.config transforms get added. Any further transforms have to be added manually. Is there a way I can change this setting?
  • Transform on build works but on publish not so much
    3 Posts | Last post August 30, 2013
    • I have been trying to get this to work with a web application called EPiServer CMS. The Web.config loads configuration sections from a number of files (configSource=). for example: Appsettings.config, episerver.config and episerverframework.config. 
      I have successfully got this working for all my files on "build" so that all the files build according to the correct transform file. Thanks to your page here: Wonderful, thank you :)
      But, the issue I am having is on publish. When I choose to publish my website only the web.config file and appsettings.config are delivered to the output folder (and correctly transformed). There are two other files in the project (EPiServerLog.config and FileSummary.config) which I do not transform and both of these files are also copied.
      Can you suggest any reason why some of the files would not be copying? (episerver.config and episerverframework.config do not copy). It doesn't matter what I set the Build Action or the Copy to Output Directory to.
      Thanks in advance, both for any light you can shed on the issue and for an amazing extension =)
    • I seem to have solved it by removing the files from my project and re-adding them. Now all seems to be working the way I want it =)
    • Just a quick note: The files before I removed them all appeared under web.config in visual studio (I mean there was a + button and the files would be grouped under) - now they are not grouped there it works fine. Hope this helps anyone else :)
  • What is wrong?
    2 Posts | Last post August 21, 2013
    • Hi,
      I'm using xdt:Locator="Condition(ID/text()='1')" to select <data> from:
      Sometimes it works and smonetimes not, can you tell me what can I do wrong that it isnt working?
    • PS. I'm doing this that way:
          <Data xdt:Locator="Condition(ID/text()='1')">
  • Must be missing something...
    1 Posts | Last post August 20, 2013
    • Just tried adding this to a VS2010 web application project and everything seemed to be ok but when I right click the web.config file I just see the stock Add Config Transform.  I can see it added to packages.config etc
      Is there something else I need to do to enable it?  
  • Visual Studio 2013
    1 Posts | Last post August 09, 2013
    • Can we expect an update for VS2013 in the near future by any chance? Was very sad to find out this is not currently compatible. Only extension from my toolset that is missing currently :/
  • Wrong filename on build server
    1 Posts | Last post August 06, 2013
    • This just recently started happening after an upgrade to Azure 2.1 NuGet components (not that this is related).  Anyway, my SlowCheetah transformations are still working on the build server, the problem is the output file name is wrong.
      I need myproject.dll.config to be the result of the transform, instead it is only transforming app.config.
      How do I tell SlowCheetah to output its transform result as myproject.dll.config?
      Thank you.
  • TransformXml skipped due to false condition
    2 Posts | Last post July 25, 2013
    • SlowCheetah has worked for me before to transform my App.config, using App.Debug.config, etc. This is in a Windows Service application.  It has worked on the build server, where I deploy by git cloning, as well without any extra steps. But now I've cloned my repo after a fresh install and it's not working for me. My OS is the same as it was before (Windows 7, 64-bit).
      Here's a clip from the build output:
      1>Task "SlowCheetah.Xdt.TransformXml" skipped, due to false condition; ( Exists('%(RelativeDir)%(Filename).$(Configuration)%(Extension)')
      1>                              and '%(Link)'=='' ) was evaluated as ( Exists('.Debug')
      1>                              and ''=='' ).
      Thanks for your help.
    • This turned out to be my own mistake. The namespace for some application settings had changed and I hadn't updated the xml in my App.Debug.config.  So they just weren't being copied because they didn't match.  It's working now. 
      Oddly enough, I'm still seeing the same message in my build output.
  • Build Error on MVC project when combined wtih MvcBuildViews option
    4 Posts | Last post July 15, 2013
    • First this is a fantastic tool, thank you.  I have a web project where we use the configSource option to redirect the web.config's AppSettings config section to an external file.  Your plugin is working great for transforming the dedicated AppSettings file *except* when we use the following option in our MVC Project:
      Using this setting over any Property Group invokes the aspnet_compiler to check MVC Views and/or Web Forms for compilation errors during the build process. When this property is set to true the configuration will not build, throwing the following error:
      {local dir}\{Solution}\{WebAppProject}\obj\{config}\csautoparameterize\original\web.config : error ASPCONFIG: An error occurred loading a configuration file: Directory 'C:\Data\Repositories\IPMS\IPMS.WWW\obj\dev-debug\csautoparameterize\original\App_Data\config' does not exist. Failed to start monitoring file changes.
      In our case the web.config file uses the configSource to redirect the following out into separate config files:
      appSetttings --> /App_Data/config/appSettings.config
      connnectionStrings --> /App_Data/config/connectionStrings.config
      Does this have to due with the timing of what files get transformed first?  Is there a workaround you are aware of?
    • Wow sorry Sayed my message got sandwiched all together.  I'll send you a formatted equivalent to your inbox.  Thanks
    • Hi DaFlookie, I just responded back to your email. We can just work it out there.
    • Hello, I see that the discussion is quite old but I have a similar problem. If it's possible could you please say what the solution to the described problem was?
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