Xamarin HttpClient

Question

I'm using Xamarin Forms to consume REST Api from NetFlix but i get this issue in Popup: System.Net.WebException: Error: NameResolutionFailure

Why o get this error?

My Code:

private HttpClient client = new HttpClient();
    private List<Movie> movies;

    public async Task<List<Movie>> LocalizaFilmesPorAtor(string ator)
    {

        if (string.IsNullOrWhiteSpace(ator))
        {
            return null;
        }
        else
        {
            string url = string.Format("http://netflixroulette.net/api/api.php?actor={0}", ator);
            var response = await client.GetAsync(url);

            if (response.StatusCode == HttpStatusCode.NotFound)
            {
                movies = new List<Movie>();
            } else
            {

                var content = await response.Content.ReadAsStringAsync();
                var _movies = JsonConvert.DeserializeObject<List<Movie>>(content);
                movies = new List<Movie>(_movies);
            }

            return movies;
        }
    }

In debug mode said the error is in this code

string url = string.Format("http://netflixroulette.net/api/api.php?actor={0}", ator);
            var response = await client.GetAsync(url);

He stops in there, the url recive the url + actor name but in next line the response stay null.

PS: I give Internet permission to my App in Manifest!

NameResolutionFailure usually means a DNS problem. Have you verified that you can load that site from the device's browser? — Jason, Feb 19 '17 at 20:48
When URL fails, check the URL in browser. sometimes it is on their side than your side. More reason to add error catch in your coding — user7568042, Feb 19 '17 at 21:08
In the android emulator I get this a lot, sometimes the network bridge doesn't come up properly. — Bill Reiss, Feb 19 '17 at 21:24
Make sure the emulator has access to the internet opening the emulator browser and accessing any website (google.com par example). — pinedax, Feb 19 '17 at 21:59

score 0 · Answer 1 · answered Feb 20 '17 at 00:41

0

nuget packages: Microsoft HTTP Client Libraries and Newtonsoft.Json.

try this:

private HttpClient client = new HttpClient();
private List<Movie> movies;

public async Task<List<Movie>> LocalizaFilmesPorAtor(string ator)
{

    if (string.IsNullOrWhiteSpace(ator))
    {
        return null;
    }
    else
    {
     var client = new HttpClient(); 
     client.BaseAddress = new Uri("http://netflixroulette.net/");
     HttpResponseMessage response = client.GetAsync("api/api.php?actor={0}", ator);
        if(response.IsSuccessStatusCode)
        {
         var json = response.Content.ReadAsStringAsync().Result;
         var _movies = JsonConvert.DeserializeObject<List<Movie>>(json);
         movies = new List<Movie>(_movies);

        }
        else
        {

            movies = new List<Movie>();
        }

        return movies;
    }
}

PS: if movies = new List(_movies) not work, try foreach.

answered Feb 20 '17 at 00:41

Jonathan Braga

1

1

When giving an answer it is preferable to give [some explanation as to WHY your answer](http://stackoverflow.com/help/how-to-answer) is the one. – Stephen Rauch Feb 20 '17 at 01:08
Sorry i'm new here, next time i will do better. – Jonathan Braga Feb 20 '17 at 18:34
1

You could actually do better right now. Just below your post on the left side is an `edit` link. Don't be shy about editing to improve things around here. Cheers. – Stephen Rauch Feb 20 '17 at 18:36
What is better/different with this solution? – maracuja-juice Jul 12 '17 at 07:59

score 0 · Answer 2 · answered Jul 12 '17 at 09:09

0

I had this issue too because my URL was malformed. Double check if your URL is correct with Postman/Browser.

answered Jul 12 '17 at 09:09

maracuja-juice

994
2
14
33

score -1 · Answer 3 · answered Mar 14 '17 at 11:53

Why cant you try Refit? Refit is a library heavily inspired by Square's Retrofit library, and it turns your REST API into a live interface

What you just need to do is:

Add Refit from Nuget Package
Create an Interface with any name
Import the Refit (Using Refit)

here is a sample code for the interface

public interface ISampleName
{

    [Get("api/api.php?actor={ator}")]
    async Task<List<Movie>> LocalizaFilmesPorAtor(string ator);
}

After that, then you can call it this way:

var SampleNameApi = RestService.For<ISampleName>("http://netflixroulette.net/");

var response= await SampleNameApi.LocalizaFilmesPorAtor("Sample");

I believe this will help you.

For More Information https://github.com/paulcbetts/refit

Xamarin HttpClient

3 Answers3