Xamarin – How to make an API call?

Refit

Create response data model

public class UserData
{
    public string name { get; set; }
    public int age { get; set; }
    public string sex { get; set; }
}

Create API Interface

using System;
using System.Threading.Tasks;
using Refit;

namespace Test.Mobile
{
    [Headers("Cache-Control: max-age=0, Content-Type: application/json")]
    public interface IAPI
    {
        [Get("/getuserdata/?userid={userId}")]
        Task<UserData> GetUserData(string userId);
    }
}

Call API

using Refit;

async Task<bool> FetchData()
{
    // 1. Check connectivity
    if (!Connectivity.IsConnected)
    {
        return false;
    }
        
    // 2. Declare base Url
    var url = "https://xxx.xx";

    // 3. Call API
    try
    {
        IAPI api = RestService.For<IAPI>(url);
        var response = await api.GetUserData("1");

        return true;
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(url);
        System.Diagnostics.Debug.WriteLine("GetUserData: {0}", ex);
    }

    return false;
}