Скачать или смотреть Running Your WebAPI from Visual Studio 2019 and Testing with Postman

Learn how to set up and run your C# WebAPI in Visual Studio 2019, and test it effectively using Postman. Get tips for debugging your API as well.
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A Complete Guide to Running Your WebAPI from Visual Studio 2019 and Testing it in Postman

As a developer, being able to test your applications efficiently is a key part of the software development process. If you're working with C# WebAPI in Visual Studio 2019 and wish to test your endpoints using Postman, you might encounter some challenges along the way. This guide aims to guide you through the necessary steps to set up and run your WebAPI and effectively test it using Postman.

Problem Overview

You may have successfully created a WebAPI project in Visual Studio 2019, but when you attempt to run it, the application may shut down unexpectedly before you can test your API with Postman. This can be frustrating, especially when you want to ensure your API requests, such as GET and POST, are functioning correctly.

Steps You Might Have Taken

Creating a New Project: You've launched a new WebAPI project in Visual Studio 2019, choosing C# as your programming language.

Running the Application: You click on the run button, and the browser opens up with the URL (e.g., http://localhost:62002/weatherforecast), but the application immediately shuts down, making it impossible to test your API in Postman.

Solution: Properly Running Your WebAPI and Testing it in Postman

Step 1: Utilizing the Terminal/Shell to Run Your Application

Instead of solely relying on Visual Studio's run functionality, you can run your WebAPI directly from the command line. Follow these steps:

Open the Terminal or Command Prompt: Navigate to the project directory where your .csproj file is located.

Use the Dotnet Command: Execute the following command:

[[See Video to Reveal this Text or Code Snippet]]

Access the Correct URL: Once the application is running, it should provide you with a URL (like https://localhost:5001). This is the URL you will use in Postman to send requests.

Step 2: Testing with Postman

Open Postman: Ensure your Postman application is running.

Make a Request: Enter the service URI you received when you ran dotnet run. For example, use https://localhost:5001/weatherforecast.

Choose Request Type: Select the type of request you would like to send (e.g., GET, POST).

Hit Send: Click on the send button and observe the results in the Postman response area. You should see the expected output, confirming that your API is working as intended.

Step 3: Debugging Your API

You might be wondering how to debug your API while using dotnet run. Here's how to do it:

Attach the Debugger: While your application is running in the terminal, you can attach the Visual Studio debugger to the running process. To do this, go to Debug > Attach to Process… in Visual Studio, and find your running application.

Set Breakpoints: You can set breakpoints in your code as usual. When requests come through Postman, execution will hit your breakpoints, allowing you to debug the functionality of your API.

Conclusion

By following these steps, you can effectively set up your C# WebAPI using Visual Studio 2019 and test your endpoints with Postman. Running the application from the terminal allows for smoother development and proper handling of requests. Additionally, by attaching the debugger, you can seamlessly troubleshoot any issues that arise during testing. With these tips and techniques, you are now equipped to dive deeper into developing robust APIs!