Create a directory for your template, with a subdirectory for each project. Extract the contents of each project's.zip file into the corresponding subdirectory that you created. In the base directory, create an XML file with a.vstemplate file extension. This file contains the metadata for the multi-project template. The Low Poly Golden Christmas Decoration Christmas Card Template for Pages is the perfect card template to send to friends and family. It is that time of year, you know! Simply open the template and add a warm holiday greeting to the second page of the template.
-->
This article highlights the most significant changes in ASP.NET Core 3.0 with links to relevant documentation.
Blazor
Blazor is a new framework in ASP.NET Core for building interactive client-side web UI with .NET:
Blazor framework supported scenarios:
For more information, see Introduction to ASP.NET Core Blazor.
Blazor Server
Blazor decouples component rendering logic from how UI updates are applied. Blazor Server provides support for hosting Razor components on the server in an ASP.NET Core app. UI updates are handled over a SignalR connection. Blazor Server is supported in ASP.NET Core 3.0.
Blazor WebAssembly (Preview)
Blazor apps can also be run directly in the browser using a WebAssembly-based .NET runtime. Blazor WebAssembly is in preview and not supported in ASP.NET Core 3.0. Blazor WebAssembly will be supported in a future release of ASP.NET Core.
Razor components
Blazor apps are built from components. Components are self-contained chunks of user interface (UI), such as a page, dialog, or form. Components are normal .NET classes that define UI rendering logic and client-side event handlers. You can create rich interactive web apps without JavaScript.
Components in Blazor are typically authored using Razor syntax, a natural blend of HTML and C#. Razor components are similar to Razor Pages and MVC views in that they both use Razor. Unlike pages and views, which are based on a request-response model, components are used specifically for handling UI composition.
gRPC
gRPC:
gRPC functionality in ASP.NET Core 3.0 includes:
For more information, see Introduction to gRPC on .NET.
SignalR
See Update SignalR code for migration instructions. SignalR now uses
System.Text.Json to serialize/deserialize JSON messages. See Switch to Newtonsoft.Json for instructions to restore the Newtonsoft.Json -based serializer. What is the best antivirus program for mac.
In the JavaScript and .NET Clients for SignalR, support was added for automatic reconnection. By default, the client tries to reconnect immediately and retry after 2, 10, and 30 seconds if necessary. If the client successfully reconnects, it receives a new connection ID. Automatic reconnect is opt-in:
The reconnection intervals can be specified by passing an array of millisecond-based durations:
A custom implementation can be passed in for full control of the reconnection intervals.
If the reconnection fails after the last reconnect interval:
During reconnection attempts, update the app UI to notify the user that the reconnection is being attempted.
To provide UI feedback when the connection is interrupted, the SignalR client API has been expanded to include the following event handlers:
The following code uses
onreconnecting to update the UI while trying to connect:
The following code uses
onreconnected to update the UI on connection:
SignalR 3.0 and later provides a custom resource to authorization handlers when a hub method requires authorization. The resource is an instance of
HubInvocationContext . The HubInvocationContext includes the:
Consider the following example of a chat room app allowing multiple organization sign-in via Azure Active Directory. Anyone with a Microsoft account can sign in to chat, but only members of the owning organization can ban users or view users' chat histories. The app could restrict certain functionality from specific users.
In the preceding code,
DomainRestrictedRequirement serves as a custom IAuthorizationRequirement . Because the HubInvocationContext resource parameter is being passed in, the internal logic can:
Templates For Pages 2017 3 0t
Individual Hub methods can be marked with the name of the policy the code checks at run-time. As clients attempt to call individual Hub methods, the
DomainRestrictedRequirement handler runs and controls access to the methods. Based on the way the DomainRestrictedRequirement controls access:
Creating the
DomainRestricted policy might involve:
SignalR hubs use Endpoint Routing. Omnioutliner pro 4 5 download free. SignalR hub connection was previously done explicitly:
In the previous version, developers needed to wire up controllers, Razor pages, and hubs in a variety of places. Explicit connection results in a series of nearly-identical routing segments:
SignalR 3.0 hubs can be routed via endpoint routing. With endpoint routing, typically all routing can be configured in
UseRouting :
ASP.NET Core 3.0 SignalR added:
Client-to-server streaming. With client-to-server streaming, server-side methods can take instances of either an
IAsyncEnumerable<T> or ChannelReader<T> . In the following C# sample, the UploadStream method on the Hub will receive a stream of strings from the client:
.NET client apps can pass either an
IAsyncEnumerable<T> or ChannelReader<T> instance as the stream argument of the UploadStream Hub method above.
After the
for loop has completed and the local function exits, the stream completion is sent:
JavaScript client apps use the SignalR
Subject (or an RxJS Subject) for the stream argument of the UploadStream Hub method above.
The JavaScript code could use the
subject.next method to handle strings as they are captured and ready to be sent to the server.
Using code like the two preceding snippets, real-time streaming experiences can be created.
New JSON serialization
ASP.NET Core 3.0 now uses System.Text.Json by default for JSON serialization:
To add Json.NET to ASP.NET Core 3.0, see Add Newtonsoft.Json-based JSON format support.
Blank Calendar Template 2017 PrintableNew Razor directives
The following list contains new Razor directives:
IdentityServer4 supports authentication and authorization for web APIs and SPAs
ASP.NET Core 3.0 offers authentication in Single Page Apps (SPAs) using the support for web API authorization. ASP.NET Core Identity for authenticating and storing users is combined with IdentityServer4 for implementing OpenID Connect.
IdentityServer4 is an OpenID Connect and OAuth 2.0 framework for ASP.NET Core 3.0. It enables the following security features:
![]()
For more information, see the IdentityServer4 documentation or Authentication and authorization for SPAs.
Certificate and Kerberos authentication
Certificate authentication requires:
Options for certificate authentication include the ability to:
A default user principal is constructed from the certificate properties. The user principal contains an event that enables supplementing or replacing the principal. For more information, see Configure certificate authentication in ASP.NET Core.
Windows Authentication has been extended onto Linux and macOS. In previous versions, Windows Authentication was limited to IIS and HTTP.sys. In ASP.NET Core 3.0, Kestrel has the ability to use Negotiate, Kerberos, and NTLM on Windows, Linux, and macOS for Windows domain-joined hosts. Kestrel support of these authentication schemes is provided by the Microsoft.AspNetCore.Authentication.Negotiate NuGet package. As with the other authentication services, configure authentication app wide, then configure the service:
Host requirements:
For more information, see Configure Windows Authentication in ASP.NET Core.
Template changes
The web UI templates (Razor Pages, MVC with controller and views) have the following removed:
The Angular template updated to use Angular 8.
The Razor class library (RCL) template defaults to Razor component development by default. A new template option in Visual Studio provides template support for pages and views. When creating an RCL from the template in a command shell, pass the
--support-pages-and-views option (dotnet new razorclasslib --support-pages-and-views ).
Generic Host
The ASP.NET Core 3.0 templates use .NET Generic Host in ASP.NET Core. Previous versions used WebHostBuilder. Using the .NET Core Generic Host (HostBuilder) provides better integration of ASP.NET Core apps with other server scenarios that aren't web-specific. For more information, see HostBuilder replaces WebHostBuilder.
Host configuration
Prior to the release of ASP.NET Core 3.0, environment variables prefixed with
ASPNETCORE_ were loaded for host configuration of the Web Host. In 3.0, AddEnvironmentVariables is used to load environment variables prefixed with DOTNET_ for host configuration with CreateDefaultBuilder .
Templates For Pages 2017 3 0 4Changes to Startup constructor injection
The Generic Host only supports the following types for
Startup constructor injection:
All services can still be injected directly as arguments to the
Startup.Configure method. For more information, see Generic Host restricts Startup constructor injection (aspnet/Announcements #353).
Kestrel
For more information, see Migrate from ASP.NET Core 2.2 to 3.0.
HTTP/2 enabled by default
HTTP/2 is enabled by default in Kestrel for HTTPS endpoints. HTTP/2 support for IIS or HTTP.sys is enabled when supported by the operating system.
EventCounters on request
The Hosting EventSource,
Microsoft.AspNetCore.Hosting , emits the following new EventCounter types related to incoming requests:
Endpoint routing![]()
Endpoint Routing, which allows frameworks (for example, MVC) to work well with middleware, is enhanced:
For more information, see Routing in ASP.NET Core.
Health ChecksCalendar Template 2017 Printable
Health Checks use endpoint routing with the Generic Host. In
Startup.Configure , call MapHealthChecks on the endpoint builder with the endpoint URL or relative path:
Health Checks endpoints can:
For more information, see the following articles:
Pipes on HttpContext
It's now possible to read the request body and write the response body using the System.IO.Pipelines API. The
HttpRequest.BodyReader property provides a PipeReader that can be used to read the request body. The HttpResponse.BodyWriter property provides a PipeWriter that can be used to write the response body. HttpRequest.BodyReader is an analogue of the HttpRequest.Body stream. HttpResponse.BodyWriter is an analogue of the HttpResponse.Body stream.
Improved error reporting in IIS
Startup errors when hosting ASP.NET Core apps in IIS now produce richer diagnostic data. These errors are reported to the Windows Event Log with stack traces wherever applicable. In addition, all warnings, errors, and unhandled exceptions are logged to the Windows Event Log.
Worker Service and Worker SDK
.NET Core 3.0 introduces the new Worker Service app template. This template provides a starting point for writing long running services in .NET Core.
For more information, see:
Forwarded Headers Middleware improvements2017 Calendar Template Edit
In previous versions of ASP.NET Core, calling UseHsts and UseHttpsRedirection were problematic when deployed to an Azure Linux or behind any reverse proxy other than IIS. The fix for previous versions is documented in Forward the scheme for Linux and non-IIS reverse proxies.
This scenario is fixed in ASP.NET Core 3.0. The host enables the Forwarded Headers Middleware when the
ASPNETCORE_FORWARDEDHEADERS_ENABLED environment variable is set to true . ASPNETCORE_FORWARDEDHEADERS_ENABLED is set to true in our container images.
Performance improvements
ASP.NET Core 3.0 includes many improvements that reduce memory usage and improve throughput:
ASP.NET Core 3.0 only runs on .NET Core 3.0Free Word Templates 2017
As of ASP.NET Core 3.0, .NET Framework is no longer a supported target framework. Projects targeting .NET Framework can continue in a fully supported fashion using the .NET Core 2.1 LTS release. Most ASP.NET Core 2.1.x related packages will be supported indefinitely, beyond the three-year LTS period for .NET Core 2.1.
For migration information, see Port your code from .NET Framework to .NET Core.
Use the ASP.NET Core shared framework
The ASP.NET Core 3.0 shared framework, contained in the Microsoft.AspNetCore.App metapackage, no longer requires an explicit
<PackageReference /> element in the project file. The shared framework is automatically referenced when using the Microsoft.NET.Sdk.Web SDK in the project file:
Assemblies removed from the ASP.NET Core shared framework
The most notable assemblies removed from the ASP.NET Core 3.0 shared framework are: Adobe zii patcher 4 3 17.
For a complete list of assemblies removed from the shared framework, see Assemblies being removed from Microsoft.AspNetCore.App 3.0. For more information on the motivation for this change, see Breaking changes to Microsoft.AspNetCore.App in 3.0 and A first look at changes coming in ASP.NET Core 3.0.
W3.CSSW3.CSS HOMEW3.CSS IntroW3.CSS ColorsW3.CSS ContainersW3.CSS PanelsW3.CSS BordersW3.CSS CardsW3.CSS DefaultsW3.CSS FontsW3.CSS GoogleW3.CSS TextW3.CSS RoundW3.CSS PaddingW3.CSS MarginsW3.CSS DisplayW3.CSS ButtonsW3.CSS NotesW3.CSS QuotesW3.CSS AlertsW3.CSS TablesW3.CSS ListsW3.CSS ImagesW3.CSS InputsW3.CSS BadgesW3.CSS TagsW3.CSS IconsW3.CSS ResponsiveW3.CSS LayoutW3.CSS AnimationsW3.CSS EffectsW3.CSS BarsW3.CSS DropdownsW3.CSS AccordionsW3.CSS NavigationW3.CSS SidebarW3.CSS TabsW3.CSS PaginationW3.CSS Progress BarsW3.CSS SlideshowW3.CSS ModalW3.CSS TooltipsW3.CSS GridW3.CSS CodeW3.CSS FiltersW3.CSS TrendsW3.CSS CaseW3.CSS MaterialW3.CSS ValidationW3.CSS VersionsW3.CSS MobileW3.CSS ColorsW3.CSS Color ClassesW3.CSS Color MaterialW3.CSS Color Flat UIW3.CSS Color Metro UIW3.CSS Color Win8W3.CSS Color iOSW3.CSS Color FashionW3.CSS Color LibrariesW3.CSS Color SchemesW3.CSS Color ThemesW3.CSS Color GeneratorWeb BuildingWeb IntroWeb HTMLWeb CSSWeb JavaScriptWeb LayoutWeb BandWeb CateringWeb RestaurantWeb ArchitectExamplesW3.CSS ExamplesW3.CSS DemosW3.CSS TemplatesReferencesW3.CSS ReferenceW3.CSS DownloadsComments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2021
Categories |