Set path in DefaultPageFactory (#5911)

src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/DefaultPageFactory.cs

@@ -61,6 +61,7 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure
             {
                 var page = (Page)activatorFactory(context);
                 page.PageContext = context;
+                page.Path = context.ActionDescriptor.RelativePath;
                 propertyActivator.Activate(page, context);
                 return page;
             };

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

@@ -18,6 +18,20 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
 
         public HttpClient Client { get; }
 
+        [Fact]
+        public async Task Page_SetsPath()
+        {
+            // Arrange
+            var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost/PathSet");
+
+            // Act
+            var response = await Client.SendAsync(request);
+
+            // Assert
+            var content = await response.Content.ReadAsStringAsync();
+            Assert.Equal("Path: /PathSet.cshtml", content.Trim());
+        }
+
         [Fact]
         public async Task NoPage_NotFound()
         {

test/Microsoft.AspNetCore.Mvc.RazorPages.Test/Infrastructure/DefaultPageFactoryTest.cs

@@ -49,7 +49,10 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure
             {
                 PageTypeInfo = typeof(TestPage).GetTypeInfo(),
             };
-            var pageContext = new PageContext();
+            var pageContext = new PageContext
+            {
+                ActionDescriptor = descriptor
+            };
             var factoryProvider = CreatePageFactory();
 
             // Act
@@ -94,6 +97,31 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure
             Assert.NotNull(testPage.ViewData);
         }
 
+        [Fact]
+        public void PageFactorySetsPath()
+        {
+            // Arrange
+            var descriptor = new CompiledPageActionDescriptor
+            {
+                PageTypeInfo = typeof(ViewDataTestPage).GetTypeInfo(),
+                ModelTypeInfo = typeof(ViewDataTestPageModel).GetTypeInfo()
+            };
+            descriptor.RelativePath = "/this/is/a/path.cshtml";
+
+            var pageContext = new PageContext
+            {
+                ActionDescriptor = descriptor
+            };
+            
+            // Act
+            var factory = CreatePageFactory().CreatePageFactory(descriptor);
+            var instance = factory(pageContext);
+
+            // Assert
+            var testPage = Assert.IsType<ViewDataTestPage>(instance);
+            Assert.Equal("/this/is/a/path.cshtml", testPage.Path);
+        }
+
         [Fact]
         public void PageFactorySetViewDataWithModelTypeWhenNotNull()
         {

test/WebSites/RazorPagesWebSite/PathSet.cshtml

@@ -0,0 +1,3 @@
+@page
+
+Path: @Path