Using RestSharp to consume a RESTful API

Question

this question is a followup from this question.

So, I'm having a hard time getting RestSharp to work in Xamarin.Forms PCL. My test API has the Numero class and the NumeroController class (amongst others).

Numero:

public class Numero
{
    public int id { get; set; }
    public int numero { get; set; }
}

NumeroController:

public IEnumerable<Numero> Get()
        {
            List<Numero> numeros = new List<Numero>();
            numeros.Add(new Numero { id = 1, numero = 1 });
            numeros.Add(new Numero { id = 2, numero = 2 });
            numeros.Add(new Numero { id = 3, numero = 3 });
            return numeros;
        }

In a web application, with the same Numero class and a webform with a textbox and button for testing:

    using RestSharp;

    List<Numero> numero;
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {


        var restClient = new RestClient(new Uri("http://localhost:52649/"));
        var request = new RestRequest("api/numero", Method.GET);
        var customers = restClient.Execute<List<Numero>>(request);
        numero = customers.Data;
        TextBox1.Text = numero[1].numero.ToString();
    }

And in the Xamarin.Forms PCL, with a Numero class and a button and label as well, and this:

    using RestSharp.Portable.HttpClient;
    using RestSharp.Portable;

    List<Numero> numeros;
    public MainPage()
    {
        InitializeComponent();
    }

    private async void btn_teste_Clicked(object sender, EventArgs e)
    {
        numeros=await GetNumeros();
    }

    private async Task<List<Numero>> GetNumeros()
    {

        var restClient = new RestClient(new Uri("http://localhost:52649/"));
        var request = new RestRequest("api/numero", Method.GET);
        var customers = await restClient.Execute<List<Numero>>(request);
        lbl_teste.Text = customers.Data.ToString();

        return customers.Data;
    }

The thing is... I can get it to work just fine on the web app, but on the Xamarin app I always get an exception "An unhandled exception occured."

I'd appreciate any help given. I'm going crazy as to why this works on one platform and nt the other. I realize the Xamarin.Forms PCL is very restrictive but supposedly the RestSharp Portable was developed for this exact purpose. Perhaps it works a bit differently on Xamarin.Forms PCL?

EDIT: Here's the debug output:

InspectorDebugSession(22): StateChange: Start -> EntryPointBreakpointRegistered InspectorDebugSession(22): Constructed Android application is debugging. InspectorDebugSession(22): HandleTargetEvent: TargetReady Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/App1.Android.dll Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/App1.dll Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/FormsViewGroup.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Newtonsoft.Json.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/RestSharp.Portable.Core.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/RestSharp.Portable.HttpClient.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.Animated.Vector.Drawable.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.Design.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.v4.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.v7.AppCompat.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.v7.CardView.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.v7.MediaRouter.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.v7.RecyclerView.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Android.Support.Vector.Drawable.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Forms.Core.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Forms.Platform.Android.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Forms.Platform.dll [External] Loaded assembly: /storage/emulated/0/Android/data/App1.Android/files/.override/Xamarin.Forms.Xaml.dll [External] Loaded assembly: Mono.Android.dll [External] Loaded assembly: Java.Interop.dll [External] Loaded assembly: System.Runtime.dll [External] Resolved pending breakpoint for 'Android.Runtime.JNIEnv.RegisterJniNatives(System.IntPtr, int, System.IntPtr, System.IntPtr, int)' to [0x0](no debug symbols). Loaded assembly: System.Collections.Concurrent.dll [External] Loaded assembly: System.Threading.dll [External] Loaded assembly: System.Runtime.InteropServices.dll [External] Loaded assembly: System.Reflection.dll [External] Loaded assembly: System.Collections.dll [External] Loaded assembly: System.Linq.dll [External] Loaded assembly: System.Core.dll [External] Loaded assembly: System.Runtime.Extensions.dll [External] Loaded assembly: System.Reflection.Extensions.dll [External] InspectorDebugSession(22): HandleTargetEvent: TargetHitBreakpoint InspectorDebugSession(22): StateChange: EntryPointBreakpointRegistered -> EntryPointBreakpointHit InspectorDebugSession(22): AgentBridge.InjectAssembly: /storage/emulated/0/Android/data//files/.override/inspector-temp/Xamarin.Interactive.dll InspectorDebugSession(22): AgentBridge.InjectAssembly: /storage/emulated/0/Android/data//files/.override/inspector-temp/Xamarin.Interactive.Android.dll InspectorDebugSession(22): StateChange: EntryPointBreakpointHit -> BreakdanceInvoking Loaded assembly: /storage/emulated/0/Android/data/files/.override/inspector-temp/Xamarin.Interactive.dll [External] Loaded assembly: /storage/emulated/0/Android/data/files/.override/inspector-temp/Xamarin.Interactive.Android.dll [External] Thread started: #3 InspectorDebugSession(22): HandleTargetEvent: ThreadStarted InspectorDebugSession(22): StateChange: BreakdanceInvoking -> BreakdanceStarted 07-17 01:19:56.019 I/art ( 507): Late-enabling -Xcheck:jni 07-17 01:19:56.218 W/monodroid( 507): Creating public update directory: /data/user/0/App1.Android/files/.__override__ 07-17 01:19:56.218 W/monodroid( 507): Using override path: /data/user/0/App1.Android/files/.override 07-17 01:19:56.218 W/monodroid( 507): Using override path: /storage/emulated/0/Android/data/App1.Android/files/.override 07-17 01:19:56.219 W/monodroid( 507): Trying to load sgen from: /data/user/0/App1.Android/files/.override/libmonosgen-2.0.so 07-17 01:19:56.219 W/monodroid( 507): Trying to load sgen from: /storage/emulated/0/Android/data/App1.Android/files/.override/libmonosgen-2.0.so 07-17 01:19:56.219 W/monodroid( 507): Trying to load sgen from: /data/app/App1.Android-1/lib/arm/libmonosgen-2.0.so 07-17 01:19:56.219 W/monodroid( 507): Trying to load sgen from: /data/user/0/App1.Android/files/.override/links/libmonosgen-2.0.so 07-17 01:19:56.228 W/monodroid-debug( 507): Trying to initialize the debugger with options: --debugger-agent=transport=dt_socket,loglevel=0,address=127.0.0.1:29308,server=y,embedding=1 07-17 01:19:56.238 W/monodroid-debug( 507): Accepted stdout connection: 25 07-17 01:19:57.148 W/monodroid-gc( 507): GREF GC Threshold: 46080 07-17 01:19:57.170 W/monodroid( 507): Calling into managed runtime init Loaded assembly: System.ObjectModel.dll [External] Loaded assembly: System.dll [External] Loaded assembly: MonoDroidConstructors [External] 07-17 01:19:58.860 W/Mono ( 507): The request to load the assembly System.Xml.ReaderWriter v4.0.0.0 was remapped to v2.0.5.0 Loaded assembly: System.Threading.Tasks.dll [External] Loaded assembly: System.Xml.ReaderWriter.dll [External] Loaded assembly: System.Xml.dll [External] Loaded assembly: System.IO.dll [External] Loaded assembly: System.Linq.Expressions.dll [External] Loaded assembly: System.Resources.ResourceManager.dll [External] Loaded assembly: System.Globalization.dll [External] Loaded assembly: System.Dynamic.Runtime.dll [External] 07-17 01:19:59.453 W/Mono ( 507): The request to load the assembly System.Xml.ReaderWriter v4.0.0.0 was remapped to v2.0.5.0 Loaded assembly: System.Text.RegularExpressions.dll [External] Thread started: #4 InspectorDebugSession(22): HandleTargetEvent: ThreadStarted Thread started: #5 InspectorDebugSession(22): HandleTargetEvent: ThreadStarted Thread started: #6 InspectorDebugSession(22): HandleTargetEvent: ThreadStarted Thread started: #7 InspectorDebugSession(22): HandleTargetEvent: ThreadStarted Loaded assembly: System.ComponentModel.dll [External] 07-17 01:20:00.929 W/art ( 507): JNI RegisterNativeMethods: attempt to register 0 native methods for md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer 07-17 01:20:00.954 W/art ( 507): JNI RegisterNativeMethods: attempt to register 0 native methods for md5b60ffeb829f638581ab2bb9b1a7f4f3f.LabelRenderer 07-17 01:20:01.087 W/art ( 507): JNI RegisterNativeMethods: attempt to register 0 native methods for md5270abb39e60627f0f200893b490a1ade.ViewRenderer_2 07-17 01:20:01.184 I/HwSecImmHelper( 507): mSecurityInputMethodService is null 07-17 01:20:01.297 E/HAL ( 507): load: id=gralloc != hmi->id=gralloc 07-17 01:20:01.298 I/OpenGLRenderer( 507): Initialized EGL, version 1.4 07-17 01:20:01.310 W/OpenGLRenderer( 507): load: so=/system/lib/libhwuibp.so 07-17 01:20:01.310 W/OpenGLRenderer( 507): dlopen failed: library "/system/lib/libhwuibp.so" not found 07-17 01:20:01.310 W/OpenGLRenderer( 507): Initialize Binary Program Cache: Load Failed 07-17 01:20:01.317 E/HAL ( 507): load: id=gralloc != hmi->id=gralloc Resolved pending breakpoint at 'MainPage.xaml.cs:27,1' to void App1.MainPage.d__3.MoveNext () [0x0000e]. Loaded assembly: System.Net.Primitives.dll [External] InspectorDebugSession(22): HandleTargetEvent: TargetHitBreakpoint InspectorDebugSession(22): HandleTargetEvent: TargetStopped InspectorDebugSession(22): HandleTargetEvent: TargetStopped Loaded assembly: System.Diagnostics.Debug.dll [External] Loaded assembly: System.Diagnostics.Tools.dll [External] Loaded assembly: System.Net.Http.dll [External] 07-17 01:20:08.302 W/Mono ( 507): The request to load the assembly System.Net.Http v4.0.0.0 was remapped to v2.0.5.0 Loaded assembly: System.Text.Encoding.dll [External] InspectorDebugSession(22): HandleTargetEvent: TargetStopped Loaded assembly: System.Text.Encoding.Extensions.dll [External] InspectorDebugSession(22): HandleTargetEvent: TargetStopped Loaded assembly: Mono.Security.dll [External] 07-17 01:20:10.122 I/Choreographer( 507): Skipped 280 frames! The application may be doing too much work on its main thread. InspectorDebugSession(22): HandleTargetEvent: UnhandledException An unhandled exception occured.

InspectorDebugSession(22): Disposed InspectorDebugSession(22): HandleTargetEvent: TargetExited

you need to catch the exception and examine it to determine what the problem is. This is basic C# debugging. Further, don't use localhost - use either the FQDN or the IP of the server — Jason
– Jason, Commented Jul 17, 2017 at 0:17
Hi. Forgot about that. Added try,catch but for some reason it doesn't even go to the catch. It goes straight to break mode. — taiko
– taiko, Commented Jul 17, 2017 at 0:21
If it drops into the IDE then you should be able to view the exception — Jason
– Jason, Commented Jul 17, 2017 at 0:23
You mean the debug output? If so, I added it to the main post. I don't know if it will help. — taiko
– taiko, Commented Jul 17, 2017 at 0:25
No. If you get the "Unhandled Exception" dialog in VS, you should be able to select "Break" and drop into the debugger and view the exception details. — Jason
– Jason, Commented Jul 17, 2017 at 0:37

taiko · Accepted Answer · 2017-07-17 01:31:22Z

0

Thanks to @Jason I realised what went wrong. I was treating the xamarin app as I was treating my web app. The web app was being tested on my localhost, where I had my RESTful API test app. So everything went smothly because they were both on my localhost.

But since the xamarin app is on a phone it can't possibly find something on the localhost (which would be on the phone). I tested it on a server and it was a success!

answered Jul 17, 2017 at 1:31

taiko

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