Using HttpClient in CSharp

HttpClient is a class provided by the .NET framework that facilitates making HTTP requests and receiving HTTP responses. It offers a simple and flexible API for performing tasks such as sending GET, POST, PUT, and DELETE requests, handling headers and content, managing cookies, and configuring timeouts and other request parameters. HttpClient is widely used in C# for consuming web services, accessing RESTful APIs, and performing web scraping and automation tasks.

We've implemented a code sample that you can re-use to convert your HTML documents to PDF, JPG, PNG or WEBP using PDFShift and CSharp:

using System;
using System.IO;
using System.Net.Http;
using System.Text.Json;
using System.Threading.Tasks;

public class PDFShiftConverter
{
    private readonly HttpClient _client;
    private readonly string _apiKey;

    public PDFShiftConverter(string apiKey)
    {
        _apiKey = apiKey;
        _client = new HttpClient();
    }

    public async Task Convert(string endpoint, object parameters, string filePath)
    {
        if (!new[] { "pdf", "png", "jpg", "webp" }.Contains(endpoint))
            throw new ArgumentException("Invalid endpoint");

        var request = new HttpRequestMessage(HttpMethod.Post, $"https://api.pdfshift.io/v3/convert/{endpoint}")
        {
            Content = new StringContent(JsonSerializer.Serialize(parameters), System.Text.Encoding.UTF8, "application/json")
        };
        request.Headers.Add("Authorization", $"Basic {Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes($"api:{_apiKey}"))}");

        var response = await _client.SendAsync(request);
        response.EnsureSuccessStatusCode();

        var jsonResponse = await response.Content.ReadAsStringAsync();

        var dict = JsonSerializer.Deserialize<Dictionary<string,object>>(jsonResponse);
        if(dict.ContainsKey("filename") || dict.ContainsKey("webhook"))
        {
            return dict;
        }

        var binaryContent = await response.Content.ReadAsByteArrayAsync();

        await File.WriteAllBytesAsync(filePath, binaryContent);
    }
}

Here's how you can use the above code:

new PDFShiftConverter("sk_XXXXXXXXXXXXXX")
    .Convert("pdf", new { source = "https://en.wikipedia.org/wiki/REST" }, "result.pdf")
    .GetAwaiter()
    .GetResult();

We've tested this code with the latest version of HttpClient and it's ready to be used in your project.

But if you were to encounter any bugs or issues while running it (or if you want to suggest changes to improve the code), please contact us and we'll be happy to help you out.