COULD NOT LOAD TYPE 'System.Security.Principal.WindowsImpersonationContext' from assembly 'mscorlib'

user_7063331 0
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I'm creating an ASP.NET API Core application, to handle API services, which communicate to an Oracle Database.

At runtime, when the process tries to connect to the DB with a new Oracle Connection throught a DbContext ( Entity Framework) an unhandled error appears and forces the app to stop.

myDbContext.Database.Connection.Open();

This line causes the following error

System.TypeLoadException : 'Could not load type 'System.Security.Principal.WindowsImpersonationContext' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=xxx'.'

I had an old but similar project which used the same code and worked properly. The library used is the same for Oracle Connector : Oracle.ManagedDataAccess.EntityFramework

What I tried :

  • Unistall - Reinstall Oracle.ManagedDataAccess.EntityFramework,
  • same for other Oracle connector ( Oracle.ManagedDataAccess, Oracle.ManagedDataAccess.Core )
  • Install System.Security.Principal
  • Changing the target framework from 3.1 to 5

I went first to this page 'System.Security.Principal.WindowsImpersonationContext' from assembly 'mscorlib' error when trying to parse template with Razor Engine but did not find anything that could help me resolve this.

entity-framework oracle asp.net
2 Answers

For dot net 6, I was getting the same exception. Only kept the package: Oracle.ManagedDataAccess.Core and removed all others related to oracle and it works.

user_43170000

Get rid of 'Oracle.ManagedDataAccess'. I had both 'Oracle.ManagedDataAccess' and 'Oracle.ManagedDataAccess.Core' installed. This issue is most likely caused because 'Oracle.ManagedDataAccess' is for .NET Framework and not .NET Core/.NET 6.

user_70402420
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