Mention the Partial method for producing a PartialViewResult (dotnet#12790)

* Mention the Partial method for producing a PartialViewResult

* Minor tweaks

* Update sample project to 2.2

* Revert wording change

* Simplify code snippet

* Revert code snippet change

* Fix code snippet dev lang

Author: scottaddie

aspnetcore/mvc/views/partial.md

@@ -4,7 +4,7 @@ author: ardalis
 description: Discover how to use partial views to break up large markup files and reduce the duplication of common markup across web pages in ASP.NET Core apps.
 ms.author: riande
 ms.custom: mvc
-ms.date: 04/06/2019
+ms.date: 06/12/2019
 uid: mvc/views/partial
 ---
 # Partial views in ASP.NET Core
@@ -42,7 +42,7 @@ Don't use a partial view where complex rendering logic or code execution is requ
 
 A partial view is a *.cshtml* markup file maintained within the *Views* folder (MVC) or *Pages* folder (Razor Pages).
 
-In ASP.NET Core MVC, a controller's <xref:Microsoft.AspNetCore.Mvc.ViewResult> is capable of returning either a view or a partial view. In Razor Pages, a <xref:Microsoft.AspNetCore.Mvc.RazorPages.PageModel> can return a <xref:Microsoft.AspNetCore.Mvc.PartialViewResult>. Referencing and rendering partial views is described in the [Reference a partial view](#reference-a-partial-view) section.
+In ASP.NET Core MVC, a controller's <xref:Microsoft.AspNetCore.Mvc.ViewResult> is capable of returning either a view or a partial view. In Razor Pages, a <xref:Microsoft.AspNetCore.Mvc.RazorPages.PageModel> can return a partial view represented as a <xref:Microsoft.AspNetCore.Mvc.PartialViewResult> object. Referencing and rendering partial views is described in the [Reference a partial view](#reference-a-partial-view) section.
 
 Unlike MVC view or page rendering, a partial view doesn't run *_ViewStart.cshtml*. For more information on *_ViewStart.cshtml*, see <xref:mvc/views/layout>.
 
@@ -54,7 +54,7 @@ Partial view file names often begin with an underscore (`_`). This naming conven
 
 A partial view is a *.cshtml* markup file maintained within the *Views* folder.
 
-A controller's <xref:Microsoft.AspNetCore.Mvc.ViewResult> is capable of returning either a view or a partial view.
+A controller's <xref:Microsoft.AspNetCore.Mvc.ViewResult> is capable of returning either a view or a partial view. Referencing and rendering partial views is described in the [Reference a partial view](#reference-a-partial-view) section.
 
 Unlike MVC view rendering, a partial view doesn't run *_ViewStart.cshtml*. For more information on *_ViewStart.cshtml*, see <xref:mvc/views/layout>.
 
@@ -64,6 +64,33 @@ Partial view file names often begin with an underscore (`_`). This naming conven
 
 ## Reference a partial view
 
+::: moniker range=">= aspnetcore-2.0"
+
+### Use a partial view in a Razor Pages PageModel
+
+In ASP.NET Core 2.0 or 2.1, the following handler method renders the *\_AuthorPartialRP.cshtml* partial view to the response:
+
+```csharp
+public IActionResult OnGetPartial() =>
+    new PartialViewResult
+    {
+        ViewName = "_AuthorPartialRP",
+        ViewData = ViewData,
+    };
+```
+
+::: moniker-end
+
+::: moniker range=">= aspnetcore-2.2"
+
+In ASP.NET Core 2.2 or later, a handler method can alternatively call the <xref:Microsoft.AspNetCore.Mvc.RazorPages.PageBase.Partial*> method to produce a `PartialViewResult` object:
+
+[!code-csharp[](partial/sample/PartialViewsSample/Pages/DiscoveryRP.cshtml.cs?name=snippet_OnGetPartial)]
+
+::: moniker-end
+
+### Use a partial view in a markup file
+
 ::: moniker range=">= aspnetcore-2.1"
 
 Within a markup file, there are several ways to reference a partial view. We recommend that apps use one of the following asynchronous rendering approaches:

aspnetcore/mvc/views/partial/sample/PartialViewsSample/Pages/DiscoveryRP.cshtml.cs

@@ -7,14 +7,9 @@ public class DiscoveryModel : PageModel
     {
         public void OnGet() => Page();
 
-        public IActionResult OnGetPartial()
-        {
-            return new PartialViewResult
-            {
-                ViewName = "_AuthorPartialRP",
-                ViewData = ViewData,
-            };
-        }
-
+        #region snippet_OnGetPartial
+        public IActionResult OnGetPartial() =>
+            Partial("_AuthorPartialRP");
+        #endregion
     }
 }

aspnetcore/mvc/views/partial/sample/PartialViewsSample/PartialViewsSample.csproj

@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.1" />
   </ItemGroup>
 
 </Project>

aspnetcore/mvc/views/partial/sample/PartialViewsSample/Startup.cs

@@ -26,7 +26,8 @@ public void ConfigureServices(IServiceCollection services)
                 options.MinimumSameSitePolicy = SameSiteMode.None;
             });
 
-            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+            services.AddMvc()
+                .SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.