* Redesign CompilationResult so that it does not throw when CompiledType is accessed

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilationFailedException.cs

@@ -3,13 +3,14 @@
 
 using System;
 using System.Collections.Generic;
-using Microsoft.AspNet.Diagnostics;
+using System.Linq;
+using Microsoft.Framework.Runtime;
 using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
     /// <summary>
-    /// An exception thrown when accessing the result of a failed compilation.
+    /// An <see cref="Exception"/> thrown when accessing the result of a failed compilation.
     /// </summary>
     public class CompilationFailedException : Exception, ICompilationException
     {
@@ -20,12 +21,19 @@ public class CompilationFailedException : Exception, ICompilationException
         /// details of the compilation failure.</param>
         public CompilationFailedException(
                 [NotNull] ICompilationFailure compilationFailure)
-            : base(Resources.FormatCompilationFailed(compilationFailure.SourceFilePath))
+            : base(FormatMessage(compilationFailure))
         {
             CompilationFailures = new[] { compilationFailure };
         }
 
         /// <inheritdoc />
         public IEnumerable<ICompilationFailure> CompilationFailures { get; }
+
+        private static string FormatMessage(ICompilationFailure compilationFailure)
+        {
+            return Resources.CompilationFailed +
+                   Environment.NewLine +
+                   string.Join(Environment.NewLine, compilationFailure.Messages.Select(message => message.FormattedMessage));
+    }
     }
 }

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilationResult.cs

@@ -2,9 +2,7 @@
 // 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.IO;
-using Microsoft.AspNet.FileProviders;
+using Microsoft.Framework.Runtime;
 using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -14,8 +12,6 @@ namespace Microsoft.AspNet.Mvc.Razor
     /// </summary>
     public class CompilationResult
     {
-        private Type _type;
-
         /// <summary>
         /// Creates a new instance of <see cref="CompilationResult"/>.
         /// </summary>
@@ -24,109 +20,62 @@ protected CompilationResult()
         }
 
         /// <summary>
-        /// Gets the path of the Razor file that was compiled.
+        /// Gets (or sets in derived types) the type produced as a result of compilation.
         /// </summary>
-        public string FilePath
-        {
-            get
-            {
-                if (File != null)
-                {
-                    return File.PhysicalPath;
-                }
-                return null;
-            }
-        }
+        /// <remarks>This property is <c>null</c> when compilation failed.</remarks>
+        public Type CompiledType { get; protected set; }
 
         /// <summary>
-        /// Gets a sequence of <see cref="CompilationMessage"/> instances encountered during compilation.
+        /// Gets (or sets in derived types) the generated C# content that was compiled.
         /// </summary>
-        public IEnumerable<CompilationMessage> Messages { get; private set; }
+        public string CompiledContent { get; protected set; }
 
         /// <summary>
-        /// Gets (or sets in derived types) the generated C# content that was compiled.
+        /// Gets the <see cref="ICompilationFailure"/> produced from parsing or compiling the Razor file.
         /// </summary>
-        public string CompiledContent { get; protected set; }
+        /// <remarks>This property is <c>null</c> when compilation succeeded.</remarks>
+        public ICompilationFailure CompilationFailure { get; private set; }
 
         /// <summary>
-        /// Gets (or sets in derived types) the type produced as a result of compilation.
+        /// Gets the <see cref="CompilationResult"/>.
         /// </summary>
-        /// <exception cref="CompilationFailedException">An error occured during compilation.</exception>
-        public Type CompiledType
+        /// <returns>The current <see cref="CompilationResult"/> instance.</returns>
+        /// <exception cref="CompilationFailedException">Thrown if compilation failed.</exception>
+        public CompilationResult EnsureSuccessful()
         {
-            get
-            {
-                if (_type == null)
-                {
-                    throw CreateCompilationFailedException();
-                }
-
-                return _type;
-            }
-            protected set
+            if (CompilationFailure != null)
             {
-                _type = value;
+                throw new CompilationFailedException(CompilationFailure);
             }
-        }
 
-        private IFileInfo File { get; set; }
+            return this;
+        }
 
         /// <summary>
-        /// Creates a <see cref="CompilationResult"/> that represents a failure in compilation.
+        /// Creates a <see cref="CompilationResult"/> for a failed compilation.
         /// </summary>
-        /// <param name="fileInfo">The <see cref="IFileInfo"/> for the Razor file that was compiled.</param>
-        /// <param name="compilationContent">The generated C# content to be compiled.</param>
-        /// <param name="messages">The sequence of failure messages encountered during compilation.</param>
-        /// <returns>A CompilationResult instance representing a failure.</returns>
-        public static CompilationResult Failed([NotNull] IFileInfo file,
-                                               [NotNull] string compilationContent,
-                                               [NotNull] IEnumerable<CompilationMessage> messages)
+        /// <param name="compilationFailure">The <see cref="ICompilationFailure"/> produced from parsing or
+        /// compiling the Razor file.</param>
+        /// <returns>A <see cref="CompilationResult"/> instance for a failed compilation.</returns>
+        public static CompilationResult Failed([NotNull] ICompilationFailure compilationFailure)
         {
             return new CompilationResult
             {
-                File = file,
-                CompiledContent = compilationContent,
-                Messages = messages,
+                CompilationFailure = compilationFailure
             };
         }
 
         /// <summary>
-        /// Creates a <see cref="CompilationResult"/> that represents a success in compilation.
+        /// Creates a <see cref="CompilationResult"/> for a successful compilation.
         /// </summary>
         /// <param name="type">The compiled type.</param>
-        /// <returns>A CompilationResult instance representing a success.</returns>
+        /// <returns>A <see cref="CompilationResult"/> instance for a successful compilation.</returns>
         public static CompilationResult Successful([NotNull] Type type)
         {
             return new CompilationResult
             {
                 CompiledType = type
             };
         }
-
-        private CompilationFailedException CreateCompilationFailedException()
-        {
-            var fileContent = ReadContent(File);
-            var compilationFailure = new CompilationFailure(FilePath, fileContent, CompiledContent, Messages);
-            return new CompilationFailedException(compilationFailure);
-        }
-
-        private static string ReadContent(IFileInfo file)
-        {
-            try
-            {
-                using (var stream = file.CreateReadStream())
-                {
-                    using (var reader = new StreamReader(stream))
-                    {
-                        return reader.ReadToEnd();
-                    }
-                }
-            }
-            catch (Exception)
-            {
-                // Don't throw if reading the file fails.
-                return string.Empty;
-            }
-        }
     }
 }

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilerCache.cs

@@ -180,7 +180,7 @@ private GetOrAddResult OnCacheMiss(RelativeFileInfo file,
                                            string normalizedPath,
                                            Func<RelativeFileInfo, CompilationResult> compile)
         {
-            var compilationResult = compile(file);
+            var compilationResult = compile(file).EnsureSuccessful();
 
             // Concurrent addition to MemoryCache with the same key result in safe race.
             var cacheEntry = _cache.Set(normalizedPath,

src/Microsoft.AspNet.Mvc.Razor/Compilation/ICompilationService.cs

@@ -1,8 +1,6 @@
 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.AspNet.FileProviders;
-
 namespace Microsoft.AspNet.Mvc.Razor
 {
     /// <summary>
@@ -13,11 +11,11 @@ public interface ICompilationService
         /// <summary>
         /// Compiles content and returns the result of compilation.
         /// </summary>
-        /// <param name="fileInfo">The <see cref="IFileInfo"/> for the Razor file that was compiled.</param>
+        /// <param name="fileInfo">The <see cref="RelativeFileInfo"/> for the Razor file that was compiled.</param>
         /// <param name="compilationContent">The generated C# content to be compiled.</param>
         /// <returns>
         /// A <see cref="CompilationResult"/> representing the result of compilation.
         /// </returns>
-        CompilationResult Compile(IFileInfo fileInfo, string compilationContent);
+        CompilationResult Compile(RelativeFileInfo fileInfo, string compilationContent);
     }
 }

src/Microsoft.AspNet.Mvc.Razor/Compilation/RazorCompilationFailure.cs

@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft Open Technologies, Inc. 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 Microsoft.Framework.Runtime;
+using Microsoft.Framework.Internal;
+
+namespace Microsoft.AspNet.Mvc.Razor
+{
+    /// <summary>
+    /// <see cref="ICompilationFailure"/> for Razor parse failures.
+    /// </summary>
+    public class RazorCompilationFailure : ICompilationFailure
+    {
+        /// <summary>Initializes a new instance of <see cref="RazorCompilationFailure"/>.</summary>
+        /// <param name="sourceFilePath">The path of the Razor source file that was compiled.</param>
+        /// <param name="sourceFileContent">The contents of the Razor source file.</param>
+        /// <param name="messages">A sequence of <see cref="ICompilationMessage"/> encountered
+        /// during compilation.</param>
+        public RazorCompilationFailure(
+            [NotNull] string sourceFilePath,
+            [NotNull] string sourceFileContent,
+            [NotNull] IEnumerable<RazorCompilationMessage> messages)
+        {
+            SourceFilePath = sourceFilePath;
+            SourceFileContent = sourceFileContent;
+            Messages = messages;
+        }
+
+        /// <inheritdoc />
+        public string SourceFilePath { get; }
+
+        /// <inheritdoc />
+        public string SourceFileContent { get; }
+
+        /// <inheritdoc />
+        public string CompiledContent { get; } = null;
+
+        /// <inheritdoc />
+        public IEnumerable<ICompilationMessage> Messages { get; }
+    }
+}