# System.Composition.Hosting

``` diff
+namespace System.Composition.Hosting {
+    public class CompositionFailedException : Exception {
+        public CompositionFailedException();
+        public CompositionFailedException(string message);
+        public CompositionFailedException(string message, Exception innerException);
+    }
+    public sealed class CompositionHost : CompositionContext, IDisposable {
+        public static CompositionHost CreateCompositionHost(IEnumerable<ExportDescriptorProvider> providers);
+        public static CompositionHost CreateCompositionHost(params ExportDescriptorProvider[] providers);
+        public void Dispose();
+        public override bool TryGetExport(CompositionContract contract, out object export);
+    }
+    public class ContainerConfiguration {
+        public ContainerConfiguration();
+        public CompositionHost CreateContainer();
+        public ContainerConfiguration WithAssemblies(IEnumerable<Assembly> assemblies);
+        public ContainerConfiguration WithAssemblies(IEnumerable<Assembly> assemblies, AttributedModelProvider conventions);
+        public ContainerConfiguration WithAssembly(Assembly assembly);
+        public ContainerConfiguration WithAssembly(Assembly assembly, AttributedModelProvider conventions);
+        public ContainerConfiguration WithDefaultConventions(AttributedModelProvider conventions);
+        public ContainerConfiguration WithPart(Type partType);
+        public ContainerConfiguration WithPart(Type partType, AttributedModelProvider conventions);
+        public ContainerConfiguration WithPart<TPart>();
+        public ContainerConfiguration WithPart<TPart>(AttributedModelProvider conventions);
+        public ContainerConfiguration WithParts(IEnumerable<Type> partTypes);
+        public ContainerConfiguration WithParts(IEnumerable<Type> partTypes, AttributedModelProvider conventions);
+        public ContainerConfiguration WithParts(params Type[] partTypes);
+        public ContainerConfiguration WithProvider(ExportDescriptorProvider exportDescriptorProvider);
+    }
+}
```