Allow inline configure of options in UseDeveloperExceptionPage

Fixes #219

makefile.shade

@@ -8,4 +8,7 @@ use-standard-lifecycle
 k-standard-goals
 
 #generatepages target='initialize'
-	k command='run ../Microsoft.AspNet.Diagnostics' dnxDir='src/PageGenerator'
+	k command='run ../Microsoft.AspNet.Diagnostics' dnxDir='src/PageGenerator'
+
+#xml-docs-test .clean .build-compile description='Check generated XML documentation files for errors' target='package'
+  k-xml-docs-test

src/Microsoft.AspNet.Diagnostics/DeveloperExceptionPage/DeveloperExceptionPageExtensions.cs

@@ -7,16 +7,15 @@ using Microsoft.AspNet.Diagnostics;
 namespace Microsoft.AspNet.Builder
 {
     /// <summary>
-    /// IApplicationBuilder extension methods for the ErrorPageMiddleware.
+    /// <see cref="IApplicationBuilder"/> extension methods for the <see cref="DeveloperExceptionPageMiddleware"/>.
     /// </summary>
     public static class DeveloperExceptionPageExtensions
     {
         /// <summary>
-        /// Captures synchronous and asynchronous exceptions from the pipeline and generates HTML error responses.
+        /// Captures synchronous and asynchronous <see cref="Exception"/> instances from the pipeline and generates HTML error responses.
-        /// Full error details are only displayed by default if 'host.AppMode' is set to 'development' in the IApplicationBuilder.Properties.
         /// </summary>
-        /// <param name="builder"></param>
+        /// <param name="builder">The <see cref="IApplicationBuilder"/>.</param>
-        /// <returns></returns>
+        /// <returns>A reference to the <paramref name="builder"/> after the operation has completed.</returns>
         public static IApplicationBuilder UseDeveloperExceptionPage(this IApplicationBuilder builder)
         {
             if (builder == null)
@@ -24,23 +23,31 @@ namespace Microsoft.AspNet.Builder
                 throw new ArgumentNullException(nameof(builder));
             }
 
-            return builder.UseDeveloperExceptionPage(new ErrorPageOptions());
+            return builder.UseDeveloperExceptionPage(options => { });
         }
 
         /// <summary>
-        /// Captures synchronous and asynchronous exceptions from the pipeline and generates HTML error responses.
+        /// Captures synchronous and asynchronous <see cref="Exception"/> instances from the pipeline and generates HTML error responses.
-        /// Full error details are only displayed by default if 'host.AppMode' is set to 'development' in the IApplicationBuilder.Properties.
         /// </summary>
-        /// <param name="builder"></param>
+        /// <param name="builder">The <see cref="IApplicationBuilder"/>.</param>
-        /// <param name="options"></param>
+        /// <param name="configureOptions">A callback to configure <see cref="ErrorPageOptions"/>.</param>
-        /// <returns></returns>
+        /// <returns>A reference to the <paramref name="builder"/> after the operation has completed.</returns>
-        public static IApplicationBuilder UseDeveloperExceptionPage(this IApplicationBuilder builder, ErrorPageOptions options)
+        public static IApplicationBuilder UseDeveloperExceptionPage(
+            this IApplicationBuilder builder,
+            Action<ErrorPageOptions> configureOptions)
         {
             if (builder == null)
             {
                 throw new ArgumentNullException(nameof(builder));
             }
 
+            if (configureOptions == null)
+            {
+                throw new ArgumentNullException(nameof(configureOptions));
+            }
+
+            var options = new ErrorPageOptions();
+            configureOptions(options);
             return builder.UseMiddleware<DeveloperExceptionPageMiddleware>(options);
         }
     }

src/Microsoft.AspNet.Diagnostics/DeveloperExceptionPage/DeveloperExceptionPageMiddleware.cs

@@ -133,7 +133,7 @@ namespace Microsoft.AspNet.Diagnostics
                 };
                 var fileContent = compilationFailure
                     .SourceFileContent
-                                                    .Split(new[] { Environment.NewLine }, StringSplitOptions.None);
+                    .Split(new[] { Environment.NewLine }, StringSplitOptions.None);
 
                 foreach (var item in compilationFailure.Messages)
                 {

src/Microsoft.AspNet.Diagnostics/WelcomePage/WelcomePageMiddleware.cs

@@ -5,7 +5,6 @@
 using System;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Diagnostics.Views;
-using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http;
 
 namespace Microsoft.AspNet.Diagnostics
@@ -42,7 +41,7 @@ namespace Microsoft.AspNet.Diagnostics
         /// <summary>
         /// Process an individual request.
         /// </summary>
-        /// <param name="context">The <see cref="Microsoft.AspNet.Http.HttpContext">.</param>
+        /// <param name="context">The <see cref="HttpContext"/>.</param>
         /// <returns></returns>
         public Task Invoke(HttpContext context)
         {