Learn C#: Handle Exceptions for More Reliable Code

Taizy — Wed, 30 Aug 2023 14:11:25 +0000

Exception handling is a critical skill for any developer aiming to write robust & reliable code, particularly in scenarios involving HTTP requests. Whether you're working on a .NET based project or any other type of C# application, understanding how to handle exceptions in the context of HTTP requests is essential. In this blog, we'll explore how to use the try-catch block to manage exceptions effectively when making an HTTP request using an example.

In the following example, we use the try-catch block to handle exceptions when making an HTTP request using the HttpClient class. The code attempts to send an HTTP GET request to an invalid URL. If the response status code indicates a failure, a HttpRequestException is thrown with a descriptive error message. Otherwise, if the response is successful, a success message is printed to the console.

try
{
    using (HttpClient httpClient = new HttpClient())
    {
        string invalidUrl = "https://example.com/nonexistent-page";
        HttpResponseMessage response = await httpClient.GetAsync(invalidUrl);

        if (!response.IsSuccessStatusCode)
        {
            throw new HttpRequestException($"Failed to fetch data.\nStatus code: {response.StatusCode}");
        }
        else
        {
            Console.WriteLine("Request was successful!");
        }
    }
}
catch (HttpRequestException ex)
{
    Console.WriteLine($"Caught an HttpRequestException: {ex.Message}");
}
catch (Exception ex)
{
    Console.WriteLine($"Caught an unexpected exception: {ex.Message}");
}

I encourage you to replace the invalidUrl with a valid URL to witness a successful request. This will help you observe how the try-catch block manages exceptions & how the code behaves when dealing with different HTTP responses.

If you're looking to enhance your understanding of C# for other similar programming concepts, I invite you to explore my 'Learn C#' GitHub repository at: https://github.com/snrelghgub/LearnCSharp.

My First Day of #1000daysofcoding

Taizy — Mon, 17 Aug 2020 08:33:11 +0000

/* Today, I decided to begin a #1000daysofcoding challenge instead of the shorter #100daysofcode challenge. It just feels right to me especially after I’ve read, learnt & somewhat already applied some of the valuable things taught in the book ‘The 10X Rule’ by Grant Cardone */

/* As a matter of fact, I finished a small side project to revise & apply amongst many other things my understanding some Javascript (ES6) basics as taught on freeCodeCamp and learnt 1) how to export & import named functions & variables from module scripts & 2) how to anonymously export a default function or variable & also learnt that, for instance, curly braces { } for this type of import statement is optional */

you can view my code here: https://codesandbox.io/s/js-import-export-defaultexport-qt73b

Find me on Twitter :)
@snrelghtwt

DEV Community: Taizy

Learn C#: Handle Exceptions for More Reliable Code

My First Day of #1000daysofcoding