title | description | author | ms.author | ms.topic | ms.date | ms.custom | ms.subservice | dev_langs | |
---|---|---|---|---|---|---|---|---|---|
Tutorial: Create ASP.NET Core web services in F# |
Create and configure an ASP.NET Core web service in the Visual Studio integrated development environment (IDE) by using F#. |
anandmeg |
meghaanand |
tutorial |
01/28/2022 |
vs-acquisition |
general-ide |
|
The Visual Studio Integrated Development Environment (IDE) supports F# for several product types. You can easily create a full web services app.
For more information about coding in F#, see What is F#. To create a Hello World console app, see Get started with F# in Visual Studio.
In this tutorial, you learn how to:
[!div class="checklist"]
- Create an ASP.NET Core web service.
- Add content to the HttpGet member in F#.
- Build and run your program.
::: moniker range="vs-2019" You need Visual Studio to complete this tutorial. Visit the Visual Studio downloads page for a free version. ::: moniker-end ::: moniker range=">=vs-2022" You need Visual Studio to complete this tutorial. Visit the Visual Studio downloads page for a free version. ::: moniker-end
Be sure you have the necessary components installed:
-
Select the Start Windows icon and type Visual Studio Installer.
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Select Modify to see your installed workloads.
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Make sure that ASP.NET and web development is selected, or add it.
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If you made any changes, select Modify to install the components.
In this section, you'll create an ASP.NET Core Web API project. The project type comes with template files that constitute a functional web service, before you've even added anything.
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Start Visual Studio.
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In the start window, select Create a new project.
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On the Create a new project page, type F# web into the search box. Select the ASP.NET Core Web API project template, and then select Next.
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In the Configure your new project dialog box, for Project name, enter FSharpTutorial.
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In the Additional information dialog box, accept the default version for Framework.
When you select Create, Visual Studio creates the new F# project. You can see the project components in the Solution Explorer window. Visual Studio presents an Overview page.
-
In the Solution Explorer toolbar, expand the Controllers folder, then choose the WeatherForecastController.fs controller to open the code file in the editor.
-
Next, modify the
Get()
member to be the following code:[<HttpGet>] member this.Get() = let values = [|"Hello"; "World"; "First F#/ASP.NET Core web API!"|] ActionResult<string[]>(values)
This code contains an F# array of values that are is bound to the
values
name. It passes the values to the ASP.NET Core model-view-controller framework as anActionResult
. ASP.NET Core takes care of the rest for you. -
Select the F5 key to run your project. A browser window opens to display your Hello World message.
Note
If you get a message that asks if you want to accept an IIS SSL Express certificate, choose Yes to view the code in a web browser, and then choose Yes if you receive a follow-up security warning message.
If you haven't already, check out the Tour of F#. This tour describes the core features of the F# language. It provides an overview of some of the capabilities of F# and code samples that you can run.
[!div class="nextstepaction"] Tour of F#