Add SignOut overload + Use new auth api

src/Microsoft.AspNetCore.Mvc.Core/Resources.resx

@@ -349,9 +349,6 @@
   <data name="Formatter_NoMediaTypes" xml:space="preserve">
     <value>No media types found in '{0}.{1}'. Add at least one media type to the list of supported media types.</value>
   </data>
-  <data name="MustSpecifyAtLeastOneAuthenticationScheme" xml:space="preserve">
-    <value>At least one authentication scheme must be specified.</value>
-  </data>
   <data name="CouldNotCreateIModelBinder" xml:space="preserve">
     <value>Could not create a model binder for model object of type '{0}'.</value>
   </data>

src/Microsoft.AspNetCore.Mvc.Core/SignOutResult.cs

@@ -17,6 +17,14 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class SignOutResult : ActionResult
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="SignOutResult"/> with the default sign out scheme.
+        /// </summary>
+        public SignOutResult()
+            : this(Array.Empty<string>())
+        {
+        }
+
         /// <summary>
         /// Initializes a new instance of <see cref="SignOutResult"/> with the
         /// specified authentication scheme.
@@ -61,11 +69,6 @@ public SignOutResult(IList<string> authenticationSchemes, AuthenticationProperti
                 throw new ArgumentNullException(nameof(authenticationSchemes));
             }
 
-            if (authenticationSchemes.Count == 0)
-            {
-                throw new ArgumentException(Resources.MustSpecifyAtLeastOneAuthenticationScheme, nameof(authenticationSchemes));
-            }
-
             AuthenticationSchemes = authenticationSchemes;
             Properties = properties;
         }
@@ -96,19 +99,21 @@ public override async Task ExecuteResultAsync(ActionContext context)
                         /* type: */ nameof(SignOutResult)));
             }
 
-            if (AuthenticationSchemes.Count == 0)
-            {
-                throw new ArgumentException(Resources.MustSpecifyAtLeastOneAuthenticationScheme, nameof(AuthenticationSchemes));
-            }
-
             var loggerFactory = context.HttpContext.RequestServices.GetRequiredService<ILoggerFactory>();
             var logger = loggerFactory.CreateLogger<SignOutResult>();
 
             logger.SignOutResultExecuting(AuthenticationSchemes);
 
-            for (var i = 0; i < AuthenticationSchemes.Count; i++)
+            if (AuthenticationSchemes.Count == 0)
+            {
+                await context.HttpContext.SignOutAsync(Properties);
+            }
+            else
             {
-                await context.HttpContext.SignOutAsync(AuthenticationSchemes[i], Properties);
+                for (var i = 0; i < AuthenticationSchemes.Count; i++)
+                {
+                    await context.HttpContext.SignOutAsync(AuthenticationSchemes[i], Properties);
+                }
             }
         }
     }

test/Microsoft.AspNetCore.Mvc.Core.Test/SignOutResultTest.cs

@@ -17,6 +17,32 @@ namespace Microsoft.AspNetCore.Mvc
 {
     public class SignOutResultTest
     {
+        [Fact]
+        public async Task ExecuteResultAsync_NoArgsInvokesDefaultSignOut()
+        {
+            // Arrange
+            var httpContext = new Mock<HttpContext>();
+            var auth = new Mock<IAuthenticationService>();
+            auth
+                .Setup(c => c.SignOutAsync(httpContext.Object, null, null))
+                .Returns(Task.CompletedTask)
+                .Verifiable();
+            httpContext.Setup(c => c.RequestServices).Returns(CreateServices(auth.Object));
+            var result = new SignOutResult();
+            var routeData = new RouteData();
+
+            var actionContext = new ActionContext(
+                httpContext.Object,
+                routeData,
+                new ActionDescriptor());
+
+            // Act
+            await result.ExecuteResultAsync(actionContext);
+
+            // Assert
+            auth.Verify();
+        }
+
         [Fact]
         public async Task ExecuteResultAsync_InvokesSignOutAsyncOnAuthenticationManager()
         {

test/WebSites/RazorPagesWebSite/Startup.cs

@@ -10,9 +10,8 @@ public class Startup
     {
         public void ConfigureServices(IServiceCollection services)
         {
-            services
-                .AddCookieAuthentication(options => options.LoginPath = "/Login")
-                .AddMvc()
+            services.AddAuthentication().AddCookie(options => options.LoginPath = "/Login");
+            services.AddMvc()
                 .AddCookieTempDataProvider()
                 .AddRazorPagesOptions(options =>
                 {

test/WebSites/RazorPagesWebSite/StartupWithBasePath.cs

@@ -10,9 +10,9 @@ public class StartupWithBasePath
     {
         public void ConfigureServices(IServiceCollection services)
         {
-            services
-                .AddCookieAuthentication(options => options.LoginPath = "/Login")
-                .AddMvc()
+            services.AddAuthentication()
+                .AddCookie(options => options.LoginPath = "/Login");
+            services.AddMvc()
                 .AddCookieTempDataProvider()
                 .AddRazorPagesOptions(options =>
                 {

test/WebSites/SecurityWebSite/Startup.cs

@@ -14,7 +14,7 @@ public void ConfigureServices(IServiceCollection services)
             // Add framework services.
             services.AddMvc();
             services.AddAntiforgery();
-            services.AddCookieAuthentication(options => 
+            services.AddAuthentication().AddCookie(options => 
             {
                 options.LoginPath = "/Home/Login";
                 options.LogoutPath = "/Home/Logout";