# Quick Start on dotnet Core

* [.NET 5.0 Download](https://dotnet.microsoft.com/download) and install visual studio code
* alternative, install [visual studio Community](https://visualstudio.microsoft.com/vs/community/) 
* [Reference](https://docs.microsoft.com/en-us/dotnet/core/tools/)

```shell

// list all templates
$ dotnet new --list

// scaffold a template project
$ dotnet new --install Microsoft.DotNet.Web.Spa.ProjectTemplates

// create REST Api project
$ dotnet new webapi

// list installed SDK
$ dotnet --list-sdks

// create global.json with configuration for SDK 3.1.101
// the config is used by .NET CLI to decide which SDK to build on
// By default, without this file, .NET CLI will use the latest SDK installed
$ dotnet new globaljson --sdk-version 3.1.101

// clean output of project
$ dotnet clean

// build the project
$ dotnet build

// run build assembly
$ dotnet myapp.dll

// build & run the current source project
$ dotnet run

// download all packages dependencies
$ dotnet restore

//
$ dotnet add package <packagename>

// create solution group of projects
$ dotnet new sln -n mysolution
$ dotnet new console -o myapp
$ dotnet new classlib -o mylib1
$ dotnet new classlib -o mylib2
$ dotnet sln mysolution.sln add myapp\myapp.csproj
$ dotnet sln mysolution.sln add mylib1\mylib1.csproj --solution-folder mylibs
$ dotnet sln mysolution.sln add mylib2\mylib2.csproj --solution-folder mylibs
```

* [Entity Framework Core](https://docs.microsoft.com/en-us/ef/) (EF Core) for SQL
  * Microsoft.EntityFrameworkCore
  * Microsoft.EntityFrameworkCore.Relational
  * Microsoft.EntityFrameworkCore.SqlServer
  * Microsoft.EntityFrameworkCore.Tools
  * Pomelo.EntityFrameworkCore.MySql
  * MySql.Data.EntityFrameworkCore (do not support ef migration)
* List of [EF Core Providers](https://docs.microsoft.com/en-us/ef/core/providers/?tabs=dotnet-core-cli)

```shell
// install ef core tool
$ dotnet tool install --global dotnet-ef

// update ef core tool
$ dotnet tool update --global dotnet-ef
///////////////////////////////
// Relaunch command prompt to effect the installation
/////////////////////////////

// add ef core design package to a project
$ dotnet add package Microsoft.EntityFrameworkCore.Design

// verify ef core installed
$ dotnet ef

// manage database
$ dotnet ef database


// manage DBContext Type
$ dotnet ef dbcontext

// manage migrations
$ dotnet ef migrations

// Steps
// 1. Create models
// 2. Create the DBContext class
// 3. Configuration appsetting.json
// 4. configure service at starup class
//
// example cli execution
$ dotnet ef migrations add DbInit
$ dotnet ef database update
```

## EF Core Migration Quick Guide

* [Reference](https://medium.com/@stas_khavruk/how-to-properly-use-ef-core-in-asp-net-core-with-mysql-database-a75f56c97318)
* Packages to add
  * *Microsoft.EntityFrameworkCore*
  * *Pomelo.EntityFrameworkCore.MySql*
  * *Microsoft.EntityFrameworkCore.Tools*

```sh
$ dotnet add package Microsoft.EntityFrameworkCore
$ dotnet add package Pomelo.EntityFrameworkCore.MySql
$ dotnet add package Microsoft.EntityFrameworkCore.Tools
```



* Models

```C#
namespace TempWeb.Models
{
    public class Pet
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

using System.Collections.Generic;

namespace TempWeb.Models
{
    public class User
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public IList<Pet> Pets { get; set; }
    }
}
```



* DBContext

```C#
using Microsoft.EntityFrameworkCore;
using TempWeb.Models;

namespace TempWeb.Data
{
    public class DataContext : DbContext
    {
        public DbSet<Pet> Pets { get; set; }
        public DbSet<User> Users { get; set; }

        public DataContext(DbContextOptions<DataContext> options) 
            : base(options) { }
    }
}
```



* appsettings.json

```json
...
"ConnectionStrings": {
    "DefaultConnection": "server=localhost;port=3306;database=test;user=test_user;password=test"
  }
...
```



* startup

```C#
...
using TempWeb.Data;
using Microsoft.EntityFrameworkCore;
using Pomelo.EntityFrameworkCore.MySql.Infrastructure;
...
public void ConfigureServices(IServiceCollection services)
{
   string mySqlConnectionStr = Configuration.GetConnectionString("DefaultConnection");
   services.AddDbContextPool<DataContext>(
        options => options.UseMySql(
            mySqlConnectionStr, ServerVersion.AutoDetect(mySqlConnectionStr)

        ));
   services.AddMvc();
}
```

* Controller with injected context

```C#
public class PetsController : ControllerBase
{
   private readonly DataContext _context;

   public PetsController(DataContext context)
   {
      _context = context;
   }
}
```



* CLI

```sh
$ dotnet ef migrations add DbInit
$ dotnet ef database update
```

* Alternative, using `Package Manager Console` (Visual Studio)

```sh
PM> Add-Migration DbInit
PM> Update-Database
```