Partial views in ASP.NET MVC allow you to reuse and customise components to act like user controls. They consist of both code and markup. They are an idea that is easy to grasp but they have great potential for the more adventurous developer who is prepared to experiment. Dino Esposito explains
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Missing Features in Entity Framework Core
Here’s a brief summary of some of the features that were present in previous versions of Entity Framework (6.x) and were excluded (or are not yet implemented) in Entity Framework Core 2.0:
CREATE DATABASE [BloggingCore2016]
GO
USE [BloggingCore2016]
GO
CREATE TABLE [Blog] (
[BlogId] int NOT NULL IDENTITY,
[Url] nvarchar(max) NOT NULL,
CONSTRAINT [PK_Blog] PRIMARY KEY ([BlogId])
);
GO
CREATE TABLE [Post] (
[PostId] int NOT NULL IDENTITY,
[BlogId] int NOT NULL,
[Content] nvarchar(max),
[Title] nvarchar(max),
CONSTRAINT [PK_Post] PRIMARY KEY ([PostId]),
CONSTRAINT [FK_Post_Blog_BlogId] FOREIGN KEY ([BlogId]) REFERENCES [Blog] ([BlogId]) ON DELETE CASCADE
);
GO
INSERT INTO [Blog] (Url) VALUES
('https://www.dntips.ir/'),
('http://blogs.msdn.com/dotnet'),
('http://blogs.msdn.com/webdev'),
('http://blogs.msdn.com/visualstudio')
GO 
dotnet ef dbcontext scaffold "Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true" Microsoft.EntityFrameworkCore.SqlServer -o Entities --context MyDBDataContext --verbose
public partial class MyDBDataContext : DbContext
{
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(@"Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true");
} Usage: dotnet ef dbcontext scaffold [arguments] [options] Arguments: [connection] The connection string of the database [provider] The provider to use. For example, Microsoft.EntityFrameworkCore.SqlServer Options: -a|--data-annotations Use DataAnnotation attributes to configure the model where possible. If omitted, the output code will use only the fluent API. -c|--context <name> Name of the generated DbContext class. -f|--force Force scaffolding to overwrite existing files. Otherwise, the code will only proceed if no output files would be overwritten. -o|--output-dir <path> Directory of the project where the classes should be output. If omitted, the top-level project directory is used. --schema <schema> Selects a schema for which to generate classes. -t|--table <schema.table> Selects a table for which to generate classes. -e|--environment <environment> The environment to use. If omitted, "Development" is used. -h|--help Show help information -v|--verbose Enable verbose output
dotnet ef dbcontext scaffold "Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true" Microsoft.EntityFrameworkCore.SqlServer -o Entities --context MyDBDataContext --verbose --force --data-annotations
dotnet ef migrations add InitialDatabase
using Microsoft.EntityFrameworkCore.Migrations;
namespace Core1RtmEmptyTest.DataLayer.Migrations
{
public partial class InitialDatabase : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
}
protected override void Down(MigrationBuilder migrationBuilder)
{
}
}
}
dotnet ef database update
dotnet ef migrations add v2 dotnet ef database update
A simple yet organized project template for building ASP.NET Core APIs in .NET Core 3.1
Tools and Frameworks Used
There are two MySQL providers for Entity Framework Core:
- The official one from MySQL: MySql.Data.EntityFrameworkCore. As of now, the latest version is 8.0.19, and works with Entity Framework Core 2.1 (and probably also 2.2). Since EF Core 3.0 is a major version with breaking changes, you cannot use it with this provider.
- The Pomelo provider: Pomelo.EntityFrameworkCore.MySql. There is a 3.1 version of this provider.
In other words, if you want to use EF Core 3.0/3.1 with MySQL, at this point you need to use the Pomelo provider (or wait for the official MySQL one to get released).
A next-level validation is domain validation, or as I've often seen referred, "business rule validation". This is more of a system state validation, "can I affect the change to my system based on the current state of my system". I might be checking the state of a single entity, a group of entities, an entire collection of entities, or the entire system. The key here is I'm not checking the request against itself, but against the system state.
Build 2021 is almost here, and Microsoft has published its catalog for sessions that will be ongoing throughout the event. We've rounded up some of the most interesting ones that we think you won't want to miss. Let's dive in!
The @font-face CSS at-rule allows authors to specify online fonts to display text on their web pages. By allowing authors to provide their own fonts, @font-face eliminates the need to depend on the limited number of fonts users have installed on their computers. Unfortunately different browsers understand differnt font types. This service allows you to generate css rule and font files that makes your font work in all the browsers that support font-face or webfonts.
