Svcutil.exe for .NET 4.0?

.net wcf .net-4.0 svcutil.exe
D.H. picture D.H. · Apr 22, 2010 · Viewed 37.6k times · Source

I was trying to use svcutil.exe to generate proxy classes for a service but when I use the /reference option to reference an assembly that is built for .NET 4.0 I get an error.

Could not load file or assembly [...] or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

So it seems that I am using an old version of svcutil.exe. I am using the one in "C:\Program Files\Microsoft SDKs\Windows\v7.0A which was the latest one I could find. Is there a later version somewhere that I am supposed to use?

Answer

Boris picture Boris · Jul 9, 2010

I had the same issue. If your project is set to use the .NET 4.0 Framework, you must choose the right version of SvcUtil.exe, or it will throw an error: "Could not load..."

  • If you look in "Microsoft SDKs\Windows\v6.0A\Bin", you will see that the version of that exe is "3.0.4506.2152".
  • The version of SvcUtil.exe in "Microsoft SDKs\Windows\v7.0A\Bin" is exactly the same, so it threw me for a loop as well.

However, there is another version of SvcUtil.exe located in "Microsoft SDKs\Windows\v7.0A\Bin\NETFX 4.0 Tools" which is version "4.0.30319.1", and if you use it, everything should work.

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