error CS0738 Interface implementation

I have the following interface:

public delegate void NotifyOnModulesAvailabilityHandler(Lazy[] modules);

public interface IModulesLoader
{
    event NotifyOnModulesAvailabilityHandler NotifyOnModulesAvailability;

    Lazy<UserControl, IModuleMetadata>[] Modules { get; set; }

    void OnImportsSatisfied();
}

I'm tring to implement this interface like this:

public class ModulesLoader : IModulesLoader, IPartImportsSatisfiedNotification
{
    #region Events

    public event NotifyOnModulesAvailabilityHandler NotifyOnModulesAvailability;

    #endregion

    #region Public Contructor

    public ModulesLoader()
    {
        DeploymentCatalogService.Instance.Initialize();

        CompositionInitializer.SatisfyImports(this);

        this.LoadModules();
    }

    #endregion

    #region Properties

    [ImportMany(AllowRecomposition = true)]
    public Lazy<UserControl, IModuleMetadata>[] Modules
    {
        get;
        set;
    }

    #endregion

    #region IPartImportsSatisfiedNotification Members

    public void OnImportsSatisfied()
    {
        var handler = this.NotifyOnModulesAvailability;
        if (handler != null)
        {
            handler(this.Modules);
        }
    }

    #endregion

    #region Private Methods

    private void LoadModules()
    {
        var wc = new WebClient();
        wc.OpenReadCompleted += (s, e) =>
        {
            var streamInfo = e.Result;

            var xElement = XElement.Load(streamInfo);

            var modulesList = from m in xElement.Elements("ModuleInfo")
                              select m;
            if (modulesList.Any())
            {
                foreach (var module in modulesList)
                {
                    var moduleName = module.Attribute("XapFilename").Value;

                    DeploymentCatalogService.Instance.AddXap(moduleName);
                }
            }
        };
        wc.OpenReadAsync(new Uri("ModulesCatalog.xml", UriKind.Relative));
    }

    #endregion

}

I get the following error:

Error 1 'TunisiaMeeting.Extensibility.Shell.Helpers.Deployment.ModulesLoader' does not implement interface member 'TunisiaMeeting.MefBase.Interfaces.IModulesLoader.Mod开发者_如何学Pythonules'. 'TunisiaMeeting.Extensibility.Shell.Helpers.Deployment.ModulesLoader.Modules' cannot implement 'TunisiaMeeting.MefBase.Interfaces.IModulesLoader.Modules' because it does not have the matching return type of 'System.Lazy``2<System.Windows.Controls.UserControl,TunisiaMeeting.MefBase.Interfaces.IModuleMetadata>[]'. C:\Imed\TunisiaMeeting\TunisiaMeeting.Extensibility.Shell\Helpers\Deployment\ModulesLoader.cs 18 18 TunisiaMeeting.Extensibility.Shell

I'm pretty sure I have the same return Type Lazy<UserControl, IModuleMetadata>[] in both my class and my interface for my property.

Any Help please ?

Thank you all

---

You haven't shown where UserControl and IModuleMetadata come from... my guess is that your interface is referring to one pair of types whereas your implementation is referring to a different pair:

• Make sure they're referring to the same types in the same namespaces
• Make sure you only have one copy of each type (e.g. that you haven't got one copy in a class library, and redeclared it somewhere else)