Building a complete .NET Core solution on Windows, using Visual Studio 2017

Visual Studio 2017 provides a full-featured development environment for developing .NET Core applications. The procedures in this document describe the steps necessary to build a typical .NET Core solution that includes reusable libraries, testing, and using third-party libraries.

Prerequisites

Follow the instructions on our prerequisites page to update your environment.

A solution using only .NET Core projects

Writing the library

  1. In Visual Studio, choose File, New, Project. In the New Project dialog, expand the Visual C# node and choose the .NET Standard node, and then choose Class Library (.NET Standard).

  2. Name the project "Library" and the solution "Golden". Leave Create directory for solution checked. Click OK.

  3. In Solution Explorer, open the context menu for the Dependencies node and choose Manage NuGet Packages.

  4. Choose "nuget.org" as the Package source, and choose the Browse tab. Browse for Newtonsoft.Json. Click Install, and accept the license agreement. The package should now appear under Dependencies/NuGet and be automatically restored.

  5. Rename the Class1.cs file to Thing.cs. Accept the rename of the class. Add a method: public int Get(int number) => Newtonsoft.Json.JsonConvert.DeserializeObject<int>($"{number}");

  6. On the Build menu, choose Build Solution.

    The solution should build without error.

Writing the test project

  1. In Solution Explorer, open the context menu for the Solution node and choose Add, New Project. In the New Project dialog, under Visual C# / .NET Core, choose Unit Test Project (.NET Core). Name it "TestLibrary" and click OK.

  2. In the TestLibrary project, open the context menu for the Dependencies node and choose Add Reference. Click Projects, then check the Library project and click OK. This adds a reference to your library from the test project.

  3. Rename the UnitTest1.cs file to LibraryTests.cs and accept the class rename. Add using Library; to the top of the file, and replace the TestMethod1 method with the following code:

    [TestMethod]
    public void ThingGetsObjectValFromNumber()
    {
        Assert.AreEqual(42, new Thing().Get(42));
    }
    

    You should now be able to build the solution.

  4. On the Test menu, choose Windows, Test Explorer in order to get the test explorer window into your workspace. After a few seconds, the ThingGetsObjectValFromNumber test should appear in the test explorer. Choose Run All.

    The test should pass.

Writing the console app

  1. In Solution Explorer, open the context menu for the solution, and add a new Console App (.NET Core) project. Name it "App".

  2. In the App project, open the context menu for the Dependencies node and choose Add, Reference.

  3. In the Reference Manager dialog, check Library under the Projects, Solution node, and then click OK

  4. Open the context menu for the App node and choose Set as StartUp Project. This ensures that hitting F5 or CTRL+F5 will start the console app.

  5. Open the Program.cs file, add a using Library; directive to the top of the file, and then add Console.WriteLine($"The answer is {new Thing().Get(42)}."); to the Main method.

  6. Set a breakpoint after the line that you just added.

  7. Press F5 to run the application..

    The application should build without error, and should hit the breakpoint. You should also be able to check that the application output "The answer is 42.".