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Visual Studio Core Average ratng: 4,5/5 3970votes ASP.NET Core - Write Apps with Visual Studio Code and Entity Framework By August 2016 Open source and cross-platform development are crucial for Microsoft’s current and future strategies. Many building blocks of the.NET stack have been open sourced, while others have been developed to embrace and support the new strategy. ASP.NET Core 1.0, currently in Release Candidate (RC) mode, is the most recent open source technology for building cross-platform applications for the Web and cloud, running on Linux, Mac OS X and Windows. ASP.NET Core lets you write Model-View-Controller (MVC) applications with C# and relies on.NET Core , the new open source and cross-platform modular set of runtimes, libraries and compilers—in RC, too.
The biggest benefit of ASP.NET Core is that it’s completely independent from any proprietary project system or integrated development environment, which means you can also build an ASP.NET Core application outside of Microsoft Visual Studio, and on OSes different than Windows. To accomplish this, you use a number of command-line tools to scaffold, build and run applications, while you can use Visual Studio Code for editing. There’s a lot of work in progress yet, so some features might change until it reaches the Release-to-Manufacturing (RTM) milestone.
This is a quick tutorial for getting set up with Visual Studio and.NET Core. Transcript Hello! For instance, ASP.NET Core used to rely on the.NET Execution Environment (DNX) and its command-line interface (CLI) to build and manage applications; because ASP.NET Core is built upon.NET Core, DNX will be retired and its CLI will switch to the.NET Core command-line tools for future releases, so keep this in mind if you want to start writing cross-platform Web apps with ASP.NET Core and C#. This article explains how to create a cross-platform ASP.NET Core Web application that leverages Entity Framework 7 to execute data operations against a database, and how to write code in Visual Studio Code , which you use on Linux, OS X and Windows. Because the focus is on data, I recommend you read the “.NET Core and Visual Studio Code” document on the official Web site. You’ll write several commands based on the DNX environment for consistency with the current RC; keep in mind this will be replaced with commands from the.NET Core CLI once ASP.NET Core turns into RTM.
I’ll point out commands that’ll be replaced where appropriate. I’ll create my sample application using the new Visual Studio Code tool. Visual Studio Code is a sophisticated, multi-language and cross-platform development tool that puts writing code at its center and that has hooks so you can issue build commands. I’m assuming you already have installed Visual Studio Code, Node.js , SQL Server Express Edition and ASP.NET Core 1.0 RC. Creating a Sample Database First, create a database with which to work.
You might use an existing database, or you could also define the data model with the Entity Framework Code First approach, but support for code migrations in ASP.NET Core is still in progress and not stable at this time. So you’ll simply create a new database that stores a list of car models and their manufacturers’ names. In SQL Server Management Studio, create a new database called Cars, then write and execute the query shown in Figure 1, which defines a table called Cars, with three columns: Id (primary key and auto-increment), CarModel (of type NVarChar(Max)) and Manufacturer (of type NVarChar(Max)). npm install -g yo generator-aspnet gulp bower That will install Yeoman (represented by “yo”) in the global location (-g) together with gulp (a tool for task automation) and bower (a client-side library manager). Notice that Yeoman ships with a number of generators, including the ASP.NET generator and the Visual Studio Code extension generator. The generator-aspnet option in the previous command line will download and install the ASP.NET Core generator that will simplify your work. When ready, using the cd (or chdir) command, move into a folder where you want to create a new application (cd C: temp).
At this point, type the following command line. yo aspnet This will open the Yeoman ASP.NET generator, as you can see in Figure 2. Figure 2 Starting the Yeoman Generator Select the Web Application template and press Enter. In the next screen, enter CarModels as the application name and press Enter. The generator defines the application’s root namespace based on the app name casing. As a consequence, if CarModels is the application name, then the root namespace will also be CarModels; but if you enter carmodels or carModels as the app’s name, then your root namespace will be carmodels or carModels, respectively.
Take care of this when specifying the application name. After a few seconds, Yeoman completes generating a new ASP.NET Core application into a subfolder called CarModels. With future ASP.NET Core releases, you also will be able to use the.NET Core CLI for scaffolding a Web application. The command line you’ll use will look like this.
dotnet new The current version of the CLI doesn’t support scaffolding a Web application, yet; rather, it generates an empty Console application, so this is another reason why you see Yeoman in action here. Enter the CarModels folder by writing “cd CarModels” and then type “code,” so that Visual Studio Code will start up, opening the current folder and its contents. When Visual Studio Code opens a folder, it scans for known project file names, such as project.json, package.json or.sln MSBuild solution files. In the case of an ASP.NET Core project, Visual Studio Code finds project.json, collects dependency information, and organizes code files and subfolders in a proper way. The first time the project is open, Visual Studio Code detects missing NuGet packages and offers to make a Restore for you. Click Restore on the informational bar and wait for the NuGet packages to be downloaded. When finished, you can leverage all the advanced code-editing features of Visual Studio Code to write and edit code files and reuse most of your existing skills with ASP.NET MVC.
In fact, Visual Studio Code not only supports C#, but it also offers syntax colorization and other advanced features for all the file types that compose an ASP.NET Core application, including.cshtml, CSS style sheets, JavaScript and.json files. Creating the Data Model with Entity Framework 7 Now that you have an empty ASP.NET Core application, the next step is to create a data model with Entity Framework 7, the new version of the popular object-relational mapper from Microsoft, which offers support for ASP.NET Core. At the time of this writing, Entity Framework 7 is in RC1.
Creating the model will be accomplished running the proper dnx commands from the command prompt and involves a couple of NuGet packages. The first NuGet package is called EntityFramework.MicrosoftSqlServer and is automatically referenced by the newly created project. The second NuGet package is called EntityFramework.MicrosoftSqlServer.Design and must be added manually to the project dependencies.
To do this, in Visual Studio Code open the project.json file and locate the following line within the dependencies node. 'EntityFramework.MicrosoftSqlServer.Design': '7.0.0-rc1-final', Notice that both packages must have the same version number, which will change in future releases. Save project.json. Visual Studio Code will detect a missing NuGet package and will prompt again for a package Restore. As usual, accept its offer. Now open a command prompt over the folder that contains the ASP.NET Core project.
The dnx environment provides the ef command, which lets you generate entity data models from the command line. This command offers additional commands, such as database, dbcontext and migrations. The database command lets you manage a database, dbcontext lets you scaffold a DbContext type and entities, and migrations lets you work with code migrations. You’ll use the dbcontext command to generate a DbContext class and the necessary entities.
You can write dnx ef to view the list of available commands (see Figure 3) or type a complete command directly. Figure 3 List of Available Entity Framework Commands When ready, write the following command line. dnx ef dbcontext scaffold 'Server=. Sqlexpress;Database=Cars;TrustedConnection=True;' EntityFramework.MicrosoftSqlServer -outputDir Models The dbcontext command takes an option called scaffold, which generates the proper DbContext and entities from the database specified in the supplied connection string.
Of course, you’ll need to replace the server name with yours. EntityFramework.MicrosoftSqlServer specifies the data provider that’ll be used for scaffolding. Notice how you can specify an output directory for your data model via the -outputDir option, which is case-sensitive. In this case, the output directory is a folder called Models, which already exists in the project and is the proper, logical place for the DbContext class and entities.
After the completion message, you’ll see how the Models folder contains a class file called CarsContext.cs, which contains the CarsContext class that inherits from DbContext, and a file called Cars.cs, which defines a class called Cars and that exposes the properties that map columns from the Cars table in the database (see Figure 4). Notice that there’s no option to control the pluralization of entity names, so this should be managed manually and is beyond the scope of this article. Figure 4 Cars Model Class in the Code Editor At this point you must supply the connection string that the application will use to connect to the database. Instead of placing the connection string into the Web.config file, this can be done in the Startup class. This declares a method called ConfigureServices, which is invoked by the runtime to configure the necessary services via dependency injection (DI), and is the recommended place for supplying the connection string.
ConfigureServices takes an argument called services, of type Microsoft.Extensions.DependencyInjection.IServiceCollection, which stores a list of services that will be injected. Consider these lines of code.
Var connection = @'Server=. Sqlexpress;Database=Cars;TrustedConnection=True;'; services.AddEntityFramework.AddSqlServer.AddDbContext(options =options.UseSqlServer(connection)); What the second line does is register the necessary Entity Framework and SQL Server services for DI and registers the DbContext class as a service. The AddDbContext method lets you specify the connection string via the DbContextBuilder.UseSqlServer method, invoked through a delegate called options. Both lines must be placed at the very beginning of the ConfigureServices method, whose complete code is shown in Figure 5. Implementing MVC Controllers ASP.NET Core supports both Web API services and MVC applications. Web API is the preferred approach if you’re building a RESTful service; the current example is instead a Web application with a UI, so you’ll use MVC.
You can implement MVC controllers and views as you would in any ASP.NET MVC application. A controller is a class that inherits from Microsoft.AspNet.Mvc.Controller and exposes actions that the UI (or other clients) can invoke to work against data. To add a controller, in Visual Studio Code right-click the Controllers folder and select New File.
When the text box appears, enter CarsController.cs as the new file name. This will add a new C# file that will also open in the code editor.
What the new controller needs to implement are methods that let you query, add and delete data. The full listing for the controller is shown in Figure 6 (with comments). Though the code might seem a bit long, IntelliSense will help you write code faster and efficiently. By This tutorial teaches ASP.NET Core MVC with controllers and views. Razor Pages is a new alternative in ASP.NET Core 2.0, a page-based programming model that makes building web UI easier and more productive. We recommend you try the tutorial before the MVC version. The Razor Pages tutorial:.
Is easier to follow. Covers more features. Is the preferred approach for new application development.
There are 3 versions of this tutorial:. macOS:. Windows:. macOS, Linux, and Windows: Install Visual Studio and.NET Core. Install the following:.
or later. version 15.3 or later with the ASP.NET and web development workload. Install Visual Studio Community 2017. Select the Community download.
Skip this step if you have Visual Studio 2017 installed. Run the installer and select the following workloads:. ASP.NET and web development (under Web & Cloud).NET Core cross-platform development (under Other Toolsets) Create a web app From Visual Studio, select File New Project. Complete the New Project dialog:. In the left pane, tap.NET Core. In the center pane, tap ASP.NET Core Web Application (.NET Core). Name the project 'MvcMovie' (It's important to name the project 'MvcMovie' so when you copy code, the namespace will match.).
Tap OK. Complete the New ASP.NET Core Web Application (.NET Core) - MvcMovie dialog:. In the version selector drop-down box select ASP.NET Core 2.-.
Select Web Application(Model-View-Controller). Tap OK. Complete the New ASP.NET Core Web Application (.NET Core) - MvcMovie dialog:. In the version selector drop-down box tap ASP.NET Core 1.1. Tap Web Application. Keep the default No Authentication. Tap OK.
Visual Studio used a default template for the MVC project you just created. You have a working app right now by entering a project name and selecting a few options. This is a simple starter project, and it's a good place to start, Tap F5 to run the app in debug mode or Ctrl-F5 in non-debug mode.
Visual Studio starts and runs your app. Notice that the address bar shows localhost:port# and not something like example.com.
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That's because localhost is the standard hostname for your local computer. When Visual Studio creates a web project, a random port is used for the web server. In the image above, the port number is 5000.
When you run the app, you'll see a different port number. Launching the app with Ctrl+F5 (non-debug mode) allows you to make code changes, save the file, refresh the browser, and see the code changes. Many developers prefer to use non-debug mode to quickly launch the app and view changes. You can launch the app in debug or non-debug mode from the Debug menu item:. You can debug the app by tapping the IIS Express button The default template gives you working Home, About and Contact links.
The browser image above doesn't show these links. Depending on the size of your browser, you might need to click the navigation icon to show them. If you were running in debug mode, tap Shift-F5 to stop debugging. In the next part of this tutorial, we'll learn about MVC and start writing some code.
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