Change GetService calls to GetRequiredService

GetRequiredService throws for missing services like GetService used to.

src/Microsoft.AspNet.Routing/RouteBuilderExtensions.cs

@@ -49,7 +49,7 @@ namespace Microsoft.AspNet.Routing
 
             var inlineConstraintResolver = routeCollectionBuilder
                                                         .ServiceProvider
-                                                        .GetService<IInlineConstraintResolver>();
+                                                        .GetRequiredService<IInlineConstraintResolver>();
             routeCollectionBuilder.Routes.Add(new TemplateRoute(routeCollectionBuilder.DefaultHandler,
                                                                 name,
                                                                 template,

src/Microsoft.AspNet.Routing/RouteCollection.cs

@@ -121,7 +121,7 @@ namespace Microsoft.AspNet.Routing
         {
             if (_logger == null)
             {
-                var factory = context.RequestServices.GetService<ILoggerFactory>();
+                var factory = context.RequestServices.GetRequiredService<ILoggerFactory>();
                 _logger = factory.Create<RouteCollection>();
             }
         }

src/Microsoft.AspNet.Routing/RouterMiddleware.cs

@@ -70,7 +70,7 @@ namespace Microsoft.AspNet.Builder
         {
             if (_logger == null)
             {
-                var factory = context.RequestServices.GetService<ILoggerFactory>();
+                var factory = context.RequestServices.GetRequiredService<ILoggerFactory>();
                 _logger = factory.Create<RouterMiddleware>();
             }
         }

src/Microsoft.AspNet.Routing/Template/TemplateRoute.cs

@@ -295,7 +295,7 @@ namespace Microsoft.AspNet.Routing.Template
         {
             if (_logger == null)
             {
-                var factory = context.RequestServices.GetService<ILoggerFactory>();
+                var factory = context.RequestServices.GetRequiredService<ILoggerFactory>();
                 _logger = factory.Create<TemplateRoute>();
                 _constraintLogger = factory.Create(typeof(RouteConstraintMatcher).FullName);
             }

test/Microsoft.AspNet.Routing.Tests/InlineRouteParameterParserTests.cs

@@ -301,7 +301,7 @@ namespace Microsoft.AspNet.Routing.Tests
                                 .ConstraintMap
                                 .Add("test", typeof(TestRouteConstraint)));
             var serviceProvider = services.BuildServiceProvider();
-            var accessor = serviceProvider.GetService<IOptions<RouteOptions>>();
+            var accessor = serviceProvider.GetRequiredService<IOptions<RouteOptions>>();
             return new DefaultInlineConstraintResolver(serviceProvider, accessor);
         }
 

test/Microsoft.AspNet.Routing.Tests/Template/TemplateBinderTests.cs

@@ -1055,7 +1055,7 @@ namespace Microsoft.AspNet.Routing.Template.Tests
         {
             var services = new ServiceCollection { OptionsServices.GetDefaultServices() };
             var serviceProvider = services.BuildServiceProvider();
-            var accessor = serviceProvider.GetService<IOptions<RouteOptions>>();
+            var accessor = serviceProvider.GetRequiredService<IOptions<RouteOptions>>();
             return new DefaultInlineConstraintResolver(serviceProvider, accessor);
         }
 

test/Microsoft.AspNet.Routing.Tests/Template/TemplateMatcherTests.cs

@@ -823,7 +823,7 @@ namespace Microsoft.AspNet.Routing.Template.Tests
         {
             var services = new ServiceCollection { OptionsServices.GetDefaultServices() };
             var serviceProvider = services.BuildServiceProvider();
-            var accessor = serviceProvider.GetService<IOptions<RouteOptions>>();
+            var accessor = serviceProvider.GetRequiredService<IOptions<RouteOptions>>();
             return new DefaultInlineConstraintResolver(serviceProvider, accessor);
         }
     }

test/Microsoft.AspNet.Routing.Tests/Template/TemplateParserTests.cs

@@ -481,7 +481,7 @@ namespace Microsoft.AspNet.Routing.Template.Tests
         {
             var services = new ServiceCollection { OptionsServices.GetDefaultServices() };
             var serviceProvider = services.BuildServiceProvider();
-            var accessor = serviceProvider.GetService<IOptions<RouteOptions>>();
+            var accessor = serviceProvider.GetRequiredService<IOptions<RouteOptions>>();
             return new DefaultInlineConstraintResolver(serviceProvider, accessor);
         }
 

test/Microsoft.AspNet.Routing.Tests/TemplateParserDefaultValuesTests.cs

@@ -110,7 +110,7 @@ namespace Microsoft.AspNet.Routing.Tests
         {
             var services = new ServiceCollection { OptionsServices.GetDefaultServices() };
             var serviceProvider = services.BuildServiceProvider();
-            var accessor = serviceProvider.GetService<IOptions<RouteOptions>>();
+            var accessor = serviceProvider.GetRequiredService<IOptions<RouteOptions>>();
             return new DefaultInlineConstraintResolver(serviceProvider, accessor);
         }
     }