[Blazor] Add support for accessing the request body form parameters (#47814)

Adds support for accessing the request body form parameters via a new `FormDataProvider` service.

Author: javiercn

src/Components/Authorization/test/AuthorizeRouteViewTest.cs

@@ -3,7 +3,6 @@
 
 using System.Security.Claims;
 using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Components.Binding;
 using Microsoft.AspNetCore.Components.Rendering;
 using Microsoft.AspNetCore.Components.RenderTree;
 using Microsoft.AspNetCore.Components.Test.Helpers;

src/Components/Components/src/Binding/CascadingModelBinder.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Reflection.Metadata;
-using Microsoft.AspNetCore.Components.Binding;
 using Microsoft.AspNetCore.Components.Routing;
 
 namespace Microsoft.AspNetCore.Components;

src/Components/Components/src/Binding/ModelBindingContext.cs

@@ -1,7 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-namespace Microsoft.AspNetCore.Components.Binding;
+namespace Microsoft.AspNetCore.Components;
 
 /// <summary>
 /// The binding context associated with a given model binding operation.

src/Components/Components/src/PublicAPI.Unshipped.txt

@@ -1,17 +1,17 @@
 #nullable enable
-Microsoft.AspNetCore.Components.Binding.ModelBindingContext
-Microsoft.AspNetCore.Components.Binding.ModelBindingContext.BindingContextId.get -> string!
-Microsoft.AspNetCore.Components.Binding.ModelBindingContext.Name.get -> string!
 Microsoft.AspNetCore.Components.CascadingModelBinder
 Microsoft.AspNetCore.Components.CascadingModelBinder.CascadingModelBinder() -> void
-Microsoft.AspNetCore.Components.CascadingModelBinder.ChildContent.get -> Microsoft.AspNetCore.Components.RenderFragment<Microsoft.AspNetCore.Components.Binding.ModelBindingContext!>!
+Microsoft.AspNetCore.Components.CascadingModelBinder.ChildContent.get -> Microsoft.AspNetCore.Components.RenderFragment<Microsoft.AspNetCore.Components.ModelBindingContext!>!
 Microsoft.AspNetCore.Components.CascadingModelBinder.ChildContent.set -> void
 Microsoft.AspNetCore.Components.CascadingModelBinder.IsFixed.get -> bool
 Microsoft.AspNetCore.Components.CascadingModelBinder.IsFixed.set -> void
 Microsoft.AspNetCore.Components.CascadingModelBinder.Name.get -> string!
 Microsoft.AspNetCore.Components.CascadingModelBinder.Name.set -> void
 Microsoft.AspNetCore.Components.ComponentBase.DispatchExceptionAsync(System.Exception! exception) -> System.Threading.Tasks.Task!
 Microsoft.AspNetCore.Components.Infrastructure.ComponentStatePersistenceManager.PersistStateAsync(Microsoft.AspNetCore.Components.IPersistentComponentStateStore! store, Microsoft.AspNetCore.Components.Dispatcher! dispatcher) -> System.Threading.Tasks.Task!
+Microsoft.AspNetCore.Components.ModelBindingContext
+Microsoft.AspNetCore.Components.ModelBindingContext.BindingContextId.get -> string!
+Microsoft.AspNetCore.Components.ModelBindingContext.Name.get -> string!
 Microsoft.AspNetCore.Components.RenderHandle.DispatchExceptionAsync(System.Exception! exception) -> System.Threading.Tasks.Task!
 *REMOVED*Microsoft.AspNetCore.Components.NavigationManager.ToAbsoluteUri(string! relativeUri) -> System.Uri!
 Microsoft.AspNetCore.Components.NavigationManager.ToAbsoluteUri(string? relativeUri) -> System.Uri!

src/Components/Components/src/RouteView.cs

@@ -5,7 +5,6 @@
 
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
-using Microsoft.AspNetCore.Components.Binding;
 using Microsoft.AspNetCore.Components.Rendering;
 using Microsoft.AspNetCore.Components.Routing;
 

src/Components/Components/test/CascadingModelBinderTest.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics.CodeAnalysis;
-using Microsoft.AspNetCore.Components.Binding;
 using Microsoft.AspNetCore.Components.Rendering;
 using Microsoft.AspNetCore.Components.Test.Helpers;
 using Microsoft.Extensions.DependencyInjection;

src/Components/Components/test/ModelBindingContextTest.cs

@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Microsoft.AspNetCore.Components.Binding;
-
 namespace Microsoft.AspNetCore.Components;
 
 public class ModelBindingContextTest

src/Components/Components/test/RouteViewTest.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Microsoft.AspNetCore.Components.Binding;
 using Microsoft.AspNetCore.Components.Rendering;
 using Microsoft.AspNetCore.Components.Test.Helpers;
 using Microsoft.Extensions.DependencyInjection;

src/Components/Endpoints/src/Binding/HttpContextFormDataProvider.cs

@@ -0,0 +1,24 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.ObjectModel;
+using Microsoft.AspNetCore.Components.Forms;
+using Microsoft.Extensions.Primitives;
+
+namespace Microsoft.AspNetCore.Components.Endpoints;
+
+internal sealed class HttpContextFormDataProvider : FormDataProvider, IHostEnvironmentFormDataProvider
+{
+    private string? _name;
+    private IReadOnlyDictionary<string, StringValues>? _entries;
+
+    public override string? Name => _name;
+
+    public override IReadOnlyDictionary<string, StringValues> Entries => _entries ?? ReadOnlyDictionary<string, StringValues>.Empty;
+
+    void IHostEnvironmentFormDataProvider.SetFormData(string name, IReadOnlyDictionary<string, StringValues> form)
+    {
+        _name = name;
+        _entries = form;
+    }
+}

src/Components/Endpoints/src/DependencyInjection/RazorComponentsServiceCollectionExtensions.cs

@@ -4,6 +4,7 @@
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Endpoints;
+using Microsoft.AspNetCore.Components.Forms;
 using Microsoft.AspNetCore.Components.Infrastructure;
 using Microsoft.AspNetCore.Components.Routing;
 using Microsoft.AspNetCore.Components.Web;
@@ -50,6 +51,9 @@ public static IRazorComponentsBuilder AddRazorComponents(this IServiceCollection
         services.TryAddScoped<IErrorBoundaryLogger, PrerenderingErrorBoundaryLogger>();
         services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<RazorComponentsEndpointsOptions>, RazorComponentsEndpointsDetailedErrorsConfiguration>());
 
+        // Form handling
+        services.TryAddScoped<FormDataProvider, HttpContextFormDataProvider>();
+
         return new DefaultRazorComponentsBuilder(services);
     }