Question

I get the following error while:

 mConsumerTokenManager = (IConsumerTokenManager)container.Resolve(typeof(IConsumerTokenManager), null);

even though I have

public class InMemoryTokenManager : IConsumerTokenManager, IOpenIdOAuthTokenManager
{
    private Dictionary<string, string> tokensAndSecrets = new Dictionary<string, string>();


public InMemoryTokenManager(){}

    /// <summary>
    /// Initializes a new instance of the <see cref="Ugi.Server.Authentication.Consumers.InMemoryTokenManager"/> class.
    /// </summary>
    /// <param name="consumerKey">The consumer key.</param>
    /// <param name="consumerSecret">The consumer secret.</param>
    public InMemoryTokenManager(string consumerKey, string consumerSecret)
    {
        if (String.IsNullOrEmpty(consumerKey))
        {
            throw new ArgumentNullException("consumerKey");
        }

        this.ConsumerKey = consumerKey;
        this.ConsumerSecret = consumerSecret;
    }

Resolution of the dependency failed, type = "DotNetOpenAuth.OAuth.ChannelElements.IConsumerTokenManager", name =

“(none)”.
Exception occurred while: while resolving.
Exception is: InvalidOperationException – The type String cannot be constructed. You must configure the container to supply this value.
———————————————–
At the time of the exception, the container was:

  Resolving Ugi.Server.Authentication.Consumers.InMemoryTokenManager,(none)

(mapped from
DotNetOpenAuth.OAuth.ChannelElements.IConsumerTokenManager, (none))
Resolving parameter “consumerKey” of constructor Ugi.Server.Authentication.Consumers.InMemoryTokenManager(System.String
consumerKey, System.String consumerSecret)
Resolving System.String,(none)

Answer 1

When a target class contains more than one constructor, Unity will use the one that has the InjectionConstructor attribute applied. If
there is more than one constructor, and none carries the
InjectionConstructor attribute, Unity will use the constructor with
the most parameters. If there is more than one such constructor (more
than one of the “longest” with the same number of parameters), Unity
will raise an exception.

You can use the following code during registration to tell Unity which constructor to use:

this.container.RegisterType<IConsumerTokenManager, InMemoryTokenManager>(new InjectionConstructor());