Connor Mills

Connor Mills

1574235940

Introduction to gRPC on .NET Core

gRPC is a language agnostic, high-performance Remote Procedure Call (RPC) framework.

The main benefits of gRPC are:

  • Modern, high-performance, lightweight RPC framework.
  • Contract-first API development, using Protocol Buffers by default, allowing for language agnostic implementations.
  • Tooling available for many languages to generate strongly-typed servers and clients.
  • Supports client, server, and bi-directional streaming calls.
  • Reduced network usage with Protobuf binary serialization.

These benefits make gRPC ideal for:

  • Lightweight microservices where efficiency is critical.
  • Polyglot systems where multiple languages are required for development.
  • Point-to-point real-time services that need to handle streaming requests or responses.

C# Tooling support for .proto files

gRPC uses a contract-first approach to API development. Services and messages are defined in *.proto files:

syntax = "proto3";

service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply);
}

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

.NET types for services, clients and messages are automatically generated by including *.proto files in a project:

  • Add a package reference to Grpc.Tools package.
  • Add *.proto files to the <Protobuf> item group.
<ItemGroup>
  <Protobuf Include="Protos\greet.proto" />
</ItemGroup>

For more information on gRPC tooling support, see gRPC services with C#.

gRPC services on ASP.NET Core

gRPC services can be hosted on ASP.NET Core. Services have full integration with popular ASP.NET Core features such as logging, dependency injection (DI), authentication and authorization.

The gRPC service project template provides a starter service:

public class GreeterService : Greeter.GreeterBase
{
    private readonly ILogger<GreeterService> _logger;

    public GreeterService(ILogger<GreeterService> logger)
    {
        _logger = logger;
    }

    public override Task<HelloReply> SayHello(HelloRequest request,
        ServerCallContext context)
    {
        _logger.LogInformation("Saying hello to {Name}", request.Name);
        return Task.FromResult(new HelloReply 
        {
            Message = "Hello " + request.Name
        });
    }
}

GreeterService inherits from the GreeterBase type, which is generated from the Greeter service in the *.proto file. The service is made accessible to clients in Startup.cs:

app.UseEndpoints(endpoints =>
{
    endpoints.MapGrpcService<GreeterService>();
});

To learn more about gRPC services on ASP.NET Core, see gRPC services with ASP.NET Core.

Call gRPC services with a .NET client

gRPC clients are concrete client types that are generated from *.proto files. The concrete gRPC client has methods that translate to the gRPC service in the *.proto file.

var channel = GrpcChannel.ForAddress("https://localhost:5001");
var client = new Greeter.GreeterClient(channel);

var response = await client.SayHello(
    new HelloRequest { Name = "World" });

Console.WriteLine(response.Message);

A gRPC client is created using a channel, which represents a long-lived connection to a gRPC service. A channel can be created using GrpcChannel.ForAddress.

For more information on creating clients, and calling different service methods, see Call gRPC services with the .NET client.

gRPC not supported on Azure App Service

Warning

ASP.NET Core gRPC is not currently supported on Azure App Service or IIS. The HTTP/2 implementation of Http.Sys does not support HTTP response trailing headers which gRPC relies on. For more information, see this GitHub issue.

#gRPC #dotnet #netccore

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Introduction to gRPC on .NET Core
Einar  Hintz

Einar Hintz

1602560783

jQuery Ajax CRUD in ASP.NET Core MVC with Modal Popup

In this article, we’ll discuss how to use jQuery Ajax for ASP.NET Core MVC CRUD Operations using Bootstrap Modal. With jQuery Ajax, we can make HTTP request to controller action methods without reloading the entire page, like a single page application.

To demonstrate CRUD operations – insert, update, delete and retrieve, the project will be dealing with details of a normal bank transaction. GitHub repository for this demo project : https://bit.ly/33KTJAu.

Sub-topics discussed :

  • Form design for insert and update operation.
  • Display forms in modal popup dialog.
  • Form post using jQuery Ajax.
  • Implement MVC CRUD operations with jQuery Ajax.
  • Loading spinner in .NET Core MVC.
  • Prevent direct access to MVC action method.

Create ASP.NET Core MVC Project

In Visual Studio 2019, Go to File > New > Project (Ctrl + Shift + N).

From new project window, Select Asp.Net Core Web Application_._

Image showing how to create ASP.NET Core Web API project in Visual Studio.

Once you provide the project name and location. Select Web Application(Model-View-Controller) and uncheck HTTPS Configuration. Above steps will create a brand new ASP.NET Core MVC project.

Showing project template selection for .NET Core MVC.

Setup a Database

Let’s create a database for this application using Entity Framework Core. For that we’ve to install corresponding NuGet Packages. Right click on project from solution explorer, select Manage NuGet Packages_,_ From browse tab, install following 3 packages.

Showing list of NuGet Packages for Entity Framework Core

Now let’s define DB model class file – /Models/TransactionModel.cs.

public class TransactionModel
{
    [Key]
    public int TransactionId { get; set; }

    [Column(TypeName ="nvarchar(12)")]
    [DisplayName("Account Number")]
    [Required(ErrorMessage ="This Field is required.")]
    [MaxLength(12,ErrorMessage ="Maximum 12 characters only")]
    public string AccountNumber { get; set; }

    [Column(TypeName ="nvarchar(100)")]
    [DisplayName("Beneficiary Name")]
    [Required(ErrorMessage = "This Field is required.")]
    public string BeneficiaryName { get; set; }

    [Column(TypeName ="nvarchar(100)")]
    [DisplayName("Bank Name")]
    [Required(ErrorMessage = "This Field is required.")]
    public string BankName { get; set; }

    [Column(TypeName ="nvarchar(11)")]
    [DisplayName("SWIFT Code")]
    [Required(ErrorMessage = "This Field is required.")]
    [MaxLength(11)]
    public string SWIFTCode { get; set; }

    [DisplayName("Amount")]
    [Required(ErrorMessage = "This Field is required.")]
    public int Amount { get; set; }

    [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
    public DateTime Date { get; set; }
}

C#Copy

Here we’ve defined model properties for the transaction with proper validation. Now let’s define  DbContextclass for EF Core.

#asp.net core article #asp.net core #add loading spinner in asp.net core #asp.net core crud without reloading #asp.net core jquery ajax form #asp.net core modal dialog #asp.net core mvc crud using jquery ajax #asp.net core mvc with jquery and ajax #asp.net core popup window #bootstrap modal popup in asp.net core mvc. bootstrap modal popup in asp.net core #delete and viewall in asp.net core #jquery ajax - insert #jquery ajax form post #modal popup dialog in asp.net core #no direct access action method #update #validation in modal popup

Einar  Hintz

Einar Hintz

1602564619

MVC User Registration & Login with ASP.NET Core Identity

User registration and authentication are mandatory in any application when you have little concern about privacy. Hence all most all application development starts with an authentication module. In this article, we will discuss the quickest way to use **ASP.NET Core Identity for User Login and Registration **in a new or existing MVC application.

Sub-topics discussed :

  • How to add ASP.NET Core Identity to MVC application.
  • Customize ASP.NET Core Identity.
  • Identity.UI Design Customization.
  • Next step.

Background

ASP.NET Core Identity is an API, which provides both user interface(UI) and functions for user authentication, registration, authorization, etc. Modules/ APIs like this will really be helpful and fasten the development process. It comes with ASP.NET Core Framework and used in many applications before. Which makes the API more dependable and trustworthy.

ASP.NET Core MVC with user authentication can easily be accomplished using Identity.UI. While creating the MVC project, you just need to select Authentication as Individual User Accounts.

Showing how to create an MVC application with ASP.NET Core Identity API

The rest will be handled by ASP.NET Core Identity UI. It already contains razor view pages and backend codes for an authentication system. But that’s not what we want in most of the cases. we want to customize ASP.NET Core Identity as per our requirement. That’s what we do here.

Create an ASP.NET Core MVC Project

First of all, I will create a brand new ASP.NET Core MVC application without any authentication selected. We could add ASP.NET Core Identity later into the project.

In Visual Studio 2019, Go to File > New > Project (Ctrl + Shift + N). From new project window, select ASP.NET Core Web Application.

Create an ASP.NET Core Web application

Once you provide the project name and location. A new window will be opened as follows, Select _Web Application(Model-View-Controller), _uncheck _HTTPS Configuration _and DO NOT select any authentication method. Above steps will create a brand new ASP.NET Core MVC project.

Select Model View Controller templet under .NET Core

#asp.net core article #asp.net core #add asp.net core identity to existing project #asp.net core identity in mvc #asp.net core mvc login and registration #login and logout in asp.net core

gRPC & ASP.NET Core 3.1: How to create a gRPC service ?

You’ll need to open Visual Studio 2019 and select “gRPC service” in “Create a new project” screen:

gRPC & ASP.NET Core 3.1: How to create a gRPC service ? – Anthony Giretti’s .NET blog

#asp.net core #.net core 3 #asp.net core 3 #envoy #grpc #.net

Authorization in asp.net core

#Asp.net core #Asp.net core mvc #Core #Asp.net core tutorials #Asp.net core with entity framework

AllowAnonymous in asp.net core

#Asp.net core #Asp.net core mvc #Core #Asp.net core tutorials #Asp.net core with entity framework