Added a test to verify ReflectionTypeLoadException

test/Microsoft.AspNetCore.Mvc.FunctionalTests/ErrorPageTests.cs

@@ -115,5 +115,23 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
             Assert.Contains("/Views/ErrorPageMiddleware/RuntimeError.cshtml", content);
             Assert.Contains(expectedMessage, content);
         }
+
+        [Fact]
+        public async Task LoaderExceptionsFromReflectionTypeLoadExceptionsAreListed()
+        {
+            // Arrange
+            var expectedMessage = "Custom Loader Exception.";
+            var expectedMediaType = MediaTypeHeaderValue.Parse("text/html; charset=utf-8");
+
+            // Act
+            var response = await Client.GetAsync("http://localhost/LoaderException");
+
+            // Assert
+            Assert.Equal(HttpStatusCode.InternalServerError, response.StatusCode);
+            Assert.Equal(expectedMediaType, response.Content.Headers.ContentType);
+            var content = await response.Content.ReadAsStringAsync();
+            Assert.Contains("Loader Exceptions:", content);
+            Assert.Contains(expectedMessage, content);
+        }
     }
 }

test/WebSites/ErrorPageMiddlewareWebSite/ErrorPageMiddlewareController.cs

@@ -1,6 +1,8 @@
 // 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;
 using Microsoft.AspNetCore.Mvc;
 
 namespace ErrorPageMiddlewareWebSite
@@ -27,5 +29,17 @@ namespace ErrorPageMiddlewareWebSite
 
         [HttpGet("/RuntimeError")]
         public IActionResult RuntimeError() => View();
+
+        [HttpGet("/LoaderException")]
+        public IActionResult ReflectionTypeLoadException()
+        {
+            throw new ReflectionTypeLoadException(
+                new[] { typeof(SomeType) },
+                new[] { new TypeLoadException("Custom Loader Exception.") });
+        }
+
+        private class SomeType
+        {
+        }
     }
 }