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Class is inaccessible due to its protection level

dba123 asked
Last Modified: 2008-01-09
Ok, I have created this class:

using System.Security.Principal;
using Microsoft.Practices.EnterpriseLibrary.Common;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder;
using Microsoft.Practices.EnterpriseLibrary.Security.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Security.Instrumentation;
using Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation;
using System.Collections.Generic;

namespace Microsoft.Practices.EnterpriseLibrary.Security
    /// <summary>
    /// implementation of the <see cref="IVAuthorizationProvider"/> interface.
    /// </summary>
    public class VAuthorizationProvider : IVAuthorizationProvider, IInstrumentationEventProvider
        AuthorizationProviderInstrumentationProvider instrumentationProvider;
.. rest of class members here

In a console project, in a class I created in order to test a method call for that class I tried to create the console test like this:

namespace TestSandBox
    class VAuthorizationProviderTesting
        static void Main(string[] args)
            List<string> rightToCheck = null;


            VAuthorizationProvider provider = new VAuthorizationProvider();
            IPrincipal principal = new GenericPrincipal(new GenericIdentity("Don"), new string[] { "Manager" });

            provider.Authorize(principal, rightToCheck);

For the line VAuthorizationProvider provider = new VAuthorizationProvider();

I get the error "Microsoft.Practices.EnterpriseLibrary.Security.VAuthorizationProvider.VAuthorizationProvider()' is inaccessible due to its protection level
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Top Expert 2007
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Mihai StancescuSoftware Engineer

You must have the main constructor of that class public, should be something like this:

public VAuthorizationProvider()
 //...constructor login here

Hope this helps!

Anurag ThakurTechnical Manager

The error can come when you can not create member of the class i.e. the default constructor (as in this case) is private
private VAuthorizationProvider ()
or it is protected

Hope this helps
Top Expert 2007

So that's three people who have pointed out that they probably needs a public constructor, do you think they are listening?


nah, I decided to be cool and use a protected.  Ah!  thanks.  Ok, so I had copied code from another abstract class.  Why did I do this, cause I was assigned in my group to create a custom AuthorizationProvider.cs.  Well, I wasn't sure how so I created a new class, copied the code and then tweaked it to make it "custom" in my n ew class as well as created a new interface.  I guess I coul dhave just inherited the initial abstract class in my new class.   Not sure which way to go.

So since I had pasted the code, the constructor was protected.  I see now.  Thanks.

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