If you have wanted to build something to spread information about COVID-19, here's a great place to start! This free API sources its data from Johns Hopkins CSSE. You can make a difference!
One of the most exciting announcements during this year’s Connect(); event was the ability to embed .NET libraries into existing iOS (Objective-C/Swift) and Android (Java) applications with .NET Embedding. This is great because you can start to share code between your iOS and Android applications, and you can also share the user interface between your apps when you combine .NET Embedding with Xamarin.Forms Native Forms. This means that you can leverage your existing investments and apps without having to re-write them from scratch to start adding cross-platform logic and UI. In fact, during the Connect(); keynote I showed how I was able to extend the open source Swift-based Kickstarter iOS application with .NET Embedding and Xamarin.Forms Native Forms. You can check out the clip below.
Top Issues Fixed in Visual Studio 2019 version 16.2.2
- Fixed Test Explorer doesn't show my tests on VS2019 16.2.0
- Fixed a problem where Visual Studio can stop responding during shutdown.
Security Advisory Notices
CVE-2019-1211 Git for Visual Studio Elevation of Privilege Vulnerability
An elevation of privilege vulnerability exists in Git for Visual Studio when it improperly parses configuration files. An attacker who successfully exploited the vulnerability could execute code in the context of another local user. To exploit the vulnerability, an authenticated attacker would need to modify Git configuration files on a system prior to a full installation of the application. The attacker would then need to convince another user on the system to execute specific Git commands. The update addresses the issue by changing the permissions required to edit configuration files.
Entity Framework در نگارش 7 خود از منابع داده‌ایی جدیدی پشتیبانی میکند(+) . یعنی از Windows Phone، Windows Store و همچنین ASP.NET 5 (اپلیکیشن‌هایی که از NET Core. استفاده می‌کنند) پشتیبانی خواهد کرد. در این نسخه از دیتابیس‌های non-relational نیز پشتیبانی می‌شود. پروایدر SQLite به صورت رسمی توسط تیم EF ارائه شده است که در ادامه نحوه‌ی استفاده از آن را در یک برنامه کنسول ساده بررسی خواهیم کرد.
کار را با بازنویسی متد OnConfiguration شروع می‌کنیم، در این قسمت باید به EF بگوئیم که می‌خواهیم از SQLite استفاده کنیم برای اینکار از یک Extension Method با نام UseSQLite و پاس دادن کانکشتن استرینگ به آن استفاده می‌کنیم.
سپس دستورات زیر را اجرا می‌کنیم:
توسط دستور Apply-Migrate دیتابیس برای شما ایجاد خواهد شد. البته این دستور زمانی استفاده می‌شود که برنامه شما یک اپلیکیشن دسکتاپ باشد. اگر اپلیکیشن شما یک Windows Phone Application است باید در زمان اجرای برنامه این کد را بنویسید:
در نهایت می‌توانید با دستور زیر از کانتکست برنامه استفاده کرده و خروجی را مشاهده کنید:
کلاس‌های برنامه:
using Microsoft.Data.Entity;
using Microsoft.Data.Entity.Metadata;
using System.Collections.Generic;
using System.Linq;
namespace UsingEF7WithSQLite
{
public class Blog
{
public int BlogId { get; set; }
public string Url { get; set; }
public List<Post> Posts { get; set; }
}
public class Post
{
public int PostId { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public int BlogId { get; set; }
public Blog Blog { get; set; }
}
} خب تا اینجا مدل‌های برنامه را تعریف کردیم، قدم بعدی افزودن پکیج مربوط به پروایدر SQLite به پروژه است، با دستور زیر این پکیج را نصب می‌کنیم:
PM> Install-Package EntityFramework.SQLite –Pre
اکنون کلاس کانتکست برنامه را به صورت زیر تعریف می‌کنیم:
namespace UsingEF7SQLiteProvider
{
public class BloggingContext : DbContext
{
public DbSet<Blog> Blogs { get; set; }
public DbSet<Post> Posts { get; set; }
protected override void OnConfiguring(DbContextOptions builder)
{
builder.UseSQLite(@"Data Source=.\BloggingDatabae.db");
}
protected override void OnModelCreating(ModelBuilder builder)
{
builder.Entity<Blog>()
.OneToMany(b => b.Posts, p => p.Blog)
.ForeignKey(p => p.BlogId);
// The EF7 SQLite provider currently doesn't support generated values
// so setting the keys to be generated from developer code
builder.Entity<Blog>()
.Property(b => b.BlogId)
.GenerateValueOnAdd(false);
builder.Entity<Post>()
.Property(b => b.BlogId)
.GenerateValueOnAdd(false);
}
}
} نکته: پروایدر فعلی SQLite در حال حاضر از Generated values پشتیبانی نمی‌کند، برای این منظور باید درون متد OnModelCreating این قابلیت را غیرفعال کنیم.
اکنون می‌توانیم از طریق پاورشل نیوگت دیتابیس را ایجاد کنیم، برای اینکار باید پکیج زیر را به پروژه اضافه کنید:
Install-Package EntityFramework.Commands -Pre
Add-Migration MyFirstMigration Apply-Migration
using (var db = new BloggingContext())
{
db.Database.AsMigrationsEnabled().ApplyMigrations();
} using (var db = new Models.BloggingContext())
{
db.Blogs.Add(new Models.Blog { Url = "https://www.dntips.ir" });
db.SaveChanges();
foreach (var item in db.Blogs)
{
Console.WriteLine(item.Url);
}
}
Console.ReadLine(); 
In this post, I will describe how to port a desktop application from .NET Framework to .NET Core. I picked a WinForms application as an example. Steps for WPF application are similar and I’ll describe what needs to be done different for WPF as we go. I will also show how you can keep using the WinForms designer in Visual Studio even though it is under development and is not yet available for .NET Core projects.
You want your local web development set up to reflect your production
reality as much as possible. URL parsing, routing, redirects, avoiding
mixed-content warnings, etc. It's very easy to accidentally find oneself
on http:// when everything in 2018 should be under https://.
I'm using ASP.NET Core 2.1 which makes local SSL super easy. After installing from http://dot.net I'll "dotnet new razor" in an empty folder to make a quick web app.
Today we are going to show you how to get started parsing Command Line arguments, following on from our series on .NET 5.
These programming books are beneficial for your programming career, from beginner to expert. These books will help you day-to-day with your general programming knowledge.
Just like our Mac client, you can now use GitHub for Windows to submit pull requests to GitHub or GitHub Enterprise, right from your desktop.
The purpose is to save you time and quickly filter out DB-experienced guys from the ones that just claim to be.
