Originally posted by: ChiragSolanki1986

Hi,

We are currently planning to migrate from CPLEX  V12.2to V12.5. However in our initial testing we have got a runtime error while executing the statement 

Cplex cpl = new Cplex();

Writer.WriteLine("Using CPLEX Version" : cpl.Version); //Error in this Line

I receive an error stating that the "Invalid managed/umanaged type combination".

Note : We are using C# and Concert(ILOG.Concert.dll & ILOG.Cplex.dll)) to optimize our solution.

Thank you for reporting this.  I was able to reproduce the error.  We are working on a resolution and will let you know when we have more information.

You can use the following work around in V12.5:

string version = string.Format(
                "{0}.{1}.{2}.{3}",
                CplexStubs.CPX_VERSION_VERSION,
                CplexStubs.CPX_VERSION_RELEASE,
                CplexStubs.CPX_VERSION_MODIFICATION,
                CplexStubs.CPX_VERSION_FIX);
System.Console.WriteLine("Using CPLEX Version: " + version);

These are undocumented fields in the class and there is no guarantee that they will exist in the next version or fix pack.  However, in the next version/fix pack the Version property should be fixed.

Here's another workaround, using reflection:

string version = Assembly.GetAssembly(typeof(Cplex)).GetName().Version.ToString();