/V1/trunk/Source/CAL/Composite.UnityExtensions/UnityContainerHelper.cs

//===============================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation

//===============================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===============================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===============================================================================



using System;

using Microsoft.Practices.Unity;



namespace Microsoft.Practices.Composite.UnityExtensions

{

    /// <summary>

    /// Extensions methods to extend and facilitate the usage of <see cref="IUnityContainer"/>.

    /// </summary>

    public static class UnityContainerHelper

    {

        /// <summary>

        /// Returns whether a specified type has a type mapping registered in the container.

        /// </summary>

        /// <param name="container">The <see cref="IUnityContainer"/> to check for the type mapping.</param>

        /// <param name="type">The type to check if there is a type mapping for.</param>

        /// <returns><see langword="true"/> if there is a type mapping registered for <paramref name="type"/>.</returns>

        /// <remarks>In order to use this extension method, you first need to add the

        /// <see cref="IUnityContainer"/> extension to the <see cref="UnityBootstrapperExtension"/>.

        /// </remarks>

        public static bool IsTypeRegistered(this IUnityContainer container, Type type)

        {

            return UnityBootstrapperExtension.IsTypeRegistered(container, type);

        }



        /// <summary>

        /// Utility method to try to resolve a service from the container avoiding an exception if the container cannot build the type.

        /// </summary>

        /// <param name="container">The cointainer that will be used to resolve the type.</param>

        /// <typeparam name="T">The type to resolve.</typeparam>

        /// <returns>The instance of <typeparamref name="T"/> built up by the container.</returns>

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter")]

        public static T TryResolve<T>(this IUnityContainer container)

        {

            object result = TryResolve(container, typeof(T));

            if (result != null)

            {

                return (T)result;

            }

            return default(T);

        }



        /// <summary>

        /// Utility method to try to resolve a service from the container avoiding an exception if the container cannot build the type.

        /// </summary>

        /// <param name="container">The cointainer that will be used to resolve the type.</param>

        /// <param name="typeToResolve">The type to resolve.</param>

        /// <returns>The instance of <paramref name="typeToResolve"/> built up by the container.</returns>

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]

        public static object TryResolve(this IUnityContainer container, Type typeToResolve)

        {

            try

            {

                return container.Resolve(typeToResolve);

            }

            catch

            {

                return null;

            }

        }

    }

}