Add wireframe for ConfigureApplicationPart

src/Microsoft.AspNetCore.Mvc.Core/ApplicationParts/ApplicationPartFactory.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Microsoft.AspNetCore.Mvc.ApplicationParts
+{
+    /// <summary>
+    /// Specifies a contract for synthesizing one or more <see cref="ApplicationPart"/> instances
+    /// from an <see cref="Assembly"/>.
+    /// <para>
+    /// By default, Mvc registers each application assembly that it discovers as an <see cref="AssemblyPart"/>.
+    /// Assemblies can optionally specify an <see cref="ApplicationPartFactory"/> to configure parts for the assembly
+    /// by using <see cref="ProvideApplicationPartFactoryAttribute"/>.
+    /// </para>
+    /// </summary>
+    public abstract class ApplicationPartFactory
+    {
+        public static readonly string DefaultContextName = "Default";
+
+        /// <summary>
+        /// Gets one or more <see cref="ApplicationPart"/> instances for the specified <paramref name="assembly"/>.
+        /// </summary>
+        /// <param name="assembly">The <see cref="Assembly"/>.</param>
+        /// <param name="context">
+        /// The context name. By default, value of this parameter is <see cref="DefaultContextName"/>.
+        /// </param>
+        public abstract IEnumerable<ApplicationPart> GetApplicationParts(Assembly assembly, string context);
+    }
+}

src/Microsoft.AspNetCore.Mvc.Core/ApplicationParts/ProvideApplicationPartFactoryAttribute.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+
+namespace Microsoft.AspNetCore.Mvc.ApplicationParts
+{
+    /// <summary>
+    /// Provides a <see cref="ApplicationPartFactory"/> type.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false)]
+    public sealed class ProvideApplicationPartFactoryAttribute : Attribute
+    {
+        public ProvideApplicationPartFactoryAttribute(Type factoryType)
+        {
+            ApplicationPartFactoryType = factoryType ?? throw new ArgumentNullException(nameof(factoryType));
+        }
+
+        public Type ApplicationPartFactoryType { get; }
+    }
+}

src/Microsoft.AspNetCore.Mvc.Core/ApplicationParts/RelatedAssemblyAttribute.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using Microsoft.AspNetCore.Mvc.Core;
+
+namespace Microsoft.AspNetCore.Mvc.ApplicationParts
+{
+    [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+    public sealed class RelatedAssemblyAttribute : Attribute
+    {
+        public RelatedAssemblyAttribute(string name)
+        {
+            if (string.IsNullOrEmpty(name))
+            {
+                throw new ArgumentException(Resources.ArgumentCannotBeNullOrEmpty, nameof(name));
+            }
+        }
+
+        public string Name { get; }
+    }
+}

src/Microsoft.AspNetCore.Mvc.Razor/ApplicationParts/CompiledRazorAssemblyApplicationPartFactory.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Microsoft.AspNetCore.Mvc.ApplicationParts
+{
+    /// <summary>
+    /// Configures an assembly as a <see cref="CompiledRazorAssemblyPart"/>.
+    /// </summary>
+    public class CompiledRazorAssemblyApplicationPartFactory : ApplicationPartFactory
+    {
+        /// <inheritdoc />
+        public override IEnumerable<ApplicationPart> GetApplicationParts(
+            Assembly assembly,
+            string configuration)
+        {
+            if (assembly == null)
+            {
+                throw new ArgumentNullException(nameof(assembly));
+            }
+
+            yield return new CompiledRazorAssemblyPart(assembly);
+        }
+    }
+}

src/Microsoft.AspNetCore.Mvc.Razor/ApplicationParts/CompiledRazorAssemblyPart.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Reflection;
+
+namespace Microsoft.AspNetCore.Mvc.ApplicationParts
+{
+    public class CompiledRazorAssemblyPart : ApplicationPart
+    {
+        public CompiledRazorAssemblyPart(Assembly assembly)
+        {
+            Assembly = assembly ?? throw new ArgumentNullException(nameof(assembly));
+        }
+
+        public Assembly Assembly { get; }
+
+        public override string Name => Assembly.GetName().Name;
+    }
+}