MATLAB: System.Typ​eInitializ​ationExcep​tion when using a .NET library compiled with MATLAB 32-bit in C#

cdotnetbuilderMATLAB Compilersystem.typeinitializationexception

I have compiled a .NET library using MATLAB 32-bit compiler and attempted to use it in a 32-bit C# application. When instantiating the class, I am getting a System.TypeInitializationException.
Please note the following:
  1. I have set the Configuration Manager in Visual Studio to x86 (32-bit)
  2. I am referencing MWArray.dll from the 32-bit installation of the MCR
  3. I have compiled my .NET library using the 32-bit version of MATLAB
  4. I have correctly installed the 32-bit version of the MATLAB compiler runtime
  5. I have already run gacutil.exe on the 32-bit version of MWArray.dll to register it in the GAC
  6. My machine is Windows 7 64-bit
I have called MATLAB support and have not received a solution at this time.

Best Answer

With the help of MATLAB technical support, this problem is now solved. Here's what happened:
My PC had both MATLAB 64-bit and MATLAB 32-bit versions installed. Although I was pointing to the correct 32-bit version of MWArray.dll in Visual Studio, for some reason, the 64-bit version was the one that was getting resolved.
To fix this problem, I added the 32-bit path to my Path system variable in Windows 7. This is found under Control Panel -> System -> Advanced system settings -> Advanced tab -> Environment Variables.
In the Environment Variables window, under "System variables," find the Path variable. Ensure that the 32-bit MATLAB root path is listed BEFORE the 64-bit MATLAB root path. In my case, the 32-bit path was not listed at all.
After adding the 32-bit MATLAB root path to the Windows 7 Path variable, the correct 32-bit version of MWArray.dll was now getting resolved in Visual Studio.
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