So the method is not in the 3.1 DLL. Just how are you seeing this exception in your code? Show the code....
Method not found: System.MissingMethodException
Ketan Patil
21
Reputation points
I am upgrading .net core web api 2.2 to .net core 3.1 while runtime i am getting error like ,
'Microsoft.Extensions.DependencyInjection.IServiceCollection Microsoft.Extensions.DependencyInjection.AuthorizationServiceCollectionExtensions.AddAuthorization(Microsoft.Extensions.DependencyInjection.IServiceCollection, System.Action`1<Microsoft.AspNetCore.Authorization.AuthorizationOptions>)'.