Hi want to receive push notifications on background task for that i have created Portable library here is my Background task class
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
using Windows.ApplicationModel.Background;
using Windows.Data.Xml.Dom;
using Windows.Networking.PushNotifications;
using Windows.Storage;
using Windows.UI.Notifications;
namespace BackgroundTask
{
public sealed class NotificationTask : IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
// Get the background task details
ApplicationDataContainer settings = ApplicationData.Current.LocalSettings;
string taskName = taskInstance.Task.Name;
Debug.WriteLine("Background " + taskName + " starting...");
// Store the content received from the notification so it can be retrieved from the UI.
ToastNotification notification = (ToastNotification )taskInstance.TriggerDetails;
settings.Values[taskName] = notification.Content;
NotificationTask.AddTostNotification(notification.Content);
Debug.WriteLine("Background " + taskName + " completed!");
}
private static void AddTostNotification(String xmlDocument)
{
List<string> messageSection = NotificationTask.GetMessageAndLandingPage(xmlDocument, "toast");
if (messageSection == null) { return; }
ToastTemplateType toastTemplate = ToastTemplateType.ToastText01;
XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(toastTemplate);
XmlNodeList toastTextElements = toastXml.GetElementsByTagName("text");
toastTextElements[0].AppendChild(toastXml.CreateTextNode(messageSection[0]));
// toastTextElements[1].AppendChild(toastXml.CreateTextNode(message));
IXmlNode toastNode = toastXml.SelectSingleNode("/toast");
((XmlElement)toastNode).SetAttribute("launch", messageSection[1]);
XmlElement audio = toastXml.CreateElement("audio");
audio.SetAttribute("src", "ms-appx:///Assets/Play-Guitar.wav");
//audio.SetAttribute("loop", "true");
toastNode.AppendChild(audio);
//launch tost immediatly
ToastNotification toast = new ToastNotification(toastXml);
ToastNotificationManager.CreateToastNotifier().Show(toast);
}
Here i am registering Task
internal async void InitChannel()
{
// Applications must have lock screen privileges in order to receive raw notifications
BackgroundAccessStatus backgroundStatus = await BackgroundExecutionManager.RequestAccessAsync();
// Make sure the user allowed privileges
if (backgroundStatus != BackgroundAccessStatus.Denied && backgroundStatus != BackgroundAccessStatus.Unspecified)
{
Windows.Storage.ApplicationDataContainer roamingSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
try
{
var channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
if (channel != null)
{
roamingSettings.Values["ExistingPushChannel"] = channel.Uri;
dispatcher = Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;
channel.PushNotificationReceived += OnPushNotificationReceived;
UnregisterBackgroundTask();
RegisterBackgroundTask();
}
else
{
roamingSettings.Values["ExistingPushChannel"] = "Failed to create channel";
}
}
catch
{
roamingSettings.Values["ExistingPushChannel"] = "Failed to create channel";
}
}
}
private void RegisterBackgroundTask()
{
BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
PushNotificationTrigger trigger = new PushNotificationTrigger();
taskBuilder.SetTrigger(trigger);
// Background tasks must live in separate DLL, and be included in the package manifest
// Also, make sure that your main application project includes a reference to this DLL
taskBuilder.TaskEntryPoint = "BackgroundTask.NotificationTask";
taskBuilder.Name = "PlaypushNotification";
try
{
BackgroundTaskRegistration task = taskBuilder.Register();
task.Completed += BackgroundTaskCompleted;
}
catch
{
UnregisterBackgroundTask();
}
}
private bool UnregisterBackgroundTask()
{
foreach (var iter in BackgroundTaskRegistration.AllTasks)
{
IBackgroundTaskRegistration task = iter.Value;
if (task.Name == "PlaypushNotification")
{
task.Unregister(true);
return true;
}
}
return false;
}
In my Manifest file
<Extensions>
<Extension Category="windows.backgroundTasks" EntryPoint="BackgroundTask.NotificationTask">
<BackgroundTasks>
<Task Type="pushNotification" />
</BackgroundTasks>
</Extension>
</Extensions>
PushNotification Trigger is not firing, when i debug i found that trigger property of BackgroundTaskRegistration is null. what is the issue? What wrong is going here?
Related
I am trying to execute Xamarin App.
I can build and deploy solutions on both Android and iOS devices. But when I am Debugging/running iOS App I am receiving an error
**System.NullReferenceException:** 'Object reference not set to an instance of an object'
on
private static ILogger logger = DependencyService.Get<ILogManager>().GetLog(); line
I have installed the latest version of the Nlog NuGet Package.
My ILogManager file is
namespace VolMobile.AppData.Interfaces
{
public interface ILogManager
{
ILogger GetLog([System.Runtime.CompilerServices.CallerFilePath]string callerFilePath = "");
void Reload();
void DeleteLog();
}
}
How can I resolve this issue?
update
My NLogManager iOS file
using System;
using System.Collections.Generic;
using Xamarin.Forms;
using System.IO;
using NLog;
using NLog.Config;
using NLog.Targets;
using VolMobile.AppData.Interfaces;
using VolMobile.iOS.Logging;
[assembly: Dependency(typeof(NLogManager))]
namespace VolMobile.iOS.Logging
{
public class NLogManager : ILogManager
{
string logFile;
LoggingConfiguration config;
public NLogManager()
{
Reload();
}
public void Reload()
{
config = new LoggingConfiguration();
var consoleTarget = new ConsoleTarget();
config.AddTarget("console", consoleTarget);
var consoleRule = new LoggingRule("*", LogLevel.Trace, consoleTarget);
config.LoggingRules.Add(consoleRule);
//File logging level
LogLevel llSetting = LogLevel.Off;
IEnumerable<LogLevel> sysLevels = LogLevel.AllLevels;
//default to trace at startup
string currentLogLevel = "Trace";
//load the app state if available
if (App.AppState != null)
currentLogLevel = App.AppState.AppSettings.LogLevel;// AppData.AppData.LogLevel;
foreach (LogLevel ll in sysLevels)
{
if (currentLogLevel == ll.Name)
{
llSetting = ll;
}
}
var fileTarget = new FileTarget();
string folder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments); //android.os.environment is the other option
fileTarget.FileName = Path.Combine(folder, "Log.txt");
fileTarget.Layout = "${longdate}|${level:uppercase=true}|${callsite}|${appdomain}|${logger}|${threadid}|${message}|{exception:format=tostring}";
config.AddTarget("file", fileTarget);
logFile = Path.Combine(folder, "Log.txt");
var fileRule = new LoggingRule("*", llSetting, fileTarget);//LogLevel.Warn
config.LoggingRules.Add(fileRule);
LogManager.Configuration = config;
}
public void DeleteLog()
{
File.Delete(logFile);
}
// Services.Logging.ILogger
//AppData.Interfaces.ILogger
//public NLogLogger GetLog([System.Runtime.CompilerServices.CallerFilePath] string callerFilePath = "")
//{
// string fileName = callerFilePath;
// if (fileName.Contains("/"))
// {
// fileName = fileName.Substring(fileName.LastIndexOf("/", StringComparison.CurrentCultureIgnoreCase) + 1);
// }
// var logger = LogManager.GetLogger(fileName);
// return new NLogLogger(logger, logFile);
//}
public AppData.Interfaces.ILogger GetLog([System.Runtime.CompilerServices.CallerFilePath] string callerFilePath = "")
{
string fileName = callerFilePath;
if (fileName.Contains("/"))
{
fileName = fileName.Substring(fileName.LastIndexOf("/", StringComparison.CurrentCultureIgnoreCase) + 1);
}
var logger = LogManager.GetLogger(fileName);
return new NLogLogger(logger, logFile);
}
}
}
The app is working perfectly fine on iOS, Andriod simulators, and Android Device only not on iOS devices.
I build project xamarin form print the text with device Nippon RPP-300 Mobile Printer. I using
using (BluetoothAdapter bluetoothAdapter = BluetoothAdapter.DefaultAdapter)
{
if (bluetoothAdapter == null)
{
throw new Exception("No default adapter");
}
if (!bluetoothAdapter.IsEnabled)
{
throw new Exception("Bluetooth not enabled");
//Intent enableIntent = new Intent(BluetoothAdapter.ActionRequestEnable);
//StartActivityForResult(enableIntent, REQUEST_ENABLE_BT);
// Otherwise, setup the chat session
}
BluetoothDevice device = (from bd in bluetoothAdapter.BondedDevices
where bd.Name == printerName
select bd).FirstOrDefault();
if (device == null)
throw new Exception(printerName + " device not found.");
using (BluetoothSocket _socket = device.CreateRfcommSocketToServiceRecord(UUID.FromString("00001101***")))
{
await _socket.ConnectAsync();
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(input);
await Task.Delay(3000);
// Write data to the device
await _socket.OutputStream.WriteAsync(buffer, 0, buffer.Length);
_socket.Close();
}
}
}
in the project.Droid. How to call using method in the project xamarin app?
You can use DependencyService .
in Forms
create an interface
public interface IBLEPrint
{
void BlePrint();
}
in Android project
Implement the interface
using xxx.Droid;
using xxx
using Xamarin.Forms;
using Xamarin.Forms.PlatformConfiguration.AndroidSpecific;
//using ...
[assembly: Dependency(typeof(BLEPrintService))]
namespace xxx.Droid
{
public class BLEPrintService : IBLEPrint
{
public void BlePrint()
{
//...
using (BluetoothAdapter bluetoothAdapter = BluetoothAdapter.DefaultAdapter)
{
if (bluetoothAdapter == null)
{
throw new Exception("No default adapter");
}
if (!bluetoothAdapter.IsEnabled)
{
throw new Exception("Bluetooth not enabled");
//Intent enableIntent = new Intent(BluetoothAdapter.ActionRequestEnable);
//StartActivityForResult(enableIntent, REQUEST_ENABLE_BT);
// Otherwise, setup the chat session
}
BluetoothDevice device = (from bd in bluetoothAdapter.BondedDevices
where bd.Name == printerName
select bd).FirstOrDefault();
if (device == null)
throw new Exception(printerName + " device not found.");
using (BluetoothSocket _socket = device.CreateRfcommSocketToServiceRecord(UUID.FromString("00001101***")))
{
await _socket.ConnectAsync();
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(input);
await Task.Delay(3000);
// Write data to the device
await _socket.OutputStream.WriteAsync(buffer, 0, buffer.Length);
_socket.Close();
}
}
}
}
}
}
I would like to save a file in a user selected folder, thats why I would like to provide a directory list to user and user will be able to choose the directory where he wants to export the data. Unfortuntely I could not find any example for directory/folder picker, I just found a file picker which is not useful for me..
https://github.com/jfversluis/FilePicker-Plugin-for-Xamarin-and-Windows
Is there any component for picking a folder for Xamarin.Forms? Actually I am just doing for Android but we use Xamarin.forms
There is none I can think of.
With netstandard everything is way more simple as you can use the classic c# File api to get the folders.
You just have to know the mappings between special folders and android folders (per example):
System.Environment.SpecialFolder Path
ApplicationData INTERNAL_STORAGE/.config
Desktop INTERNAL_STORAGE/Desktop
LocalApplicationData INTERNAL_STORAGE/.local/share
MyDocuments INTERNAL_STORAGE
MyMusic INTERNAL_STORAGE/Music
MyPictures INTERNAL_STORAGE/Pictures
MyVideos INTERNAL_STORAGE/Videos
Personal INTERNAL_STORAGE
source: https://learn.microsoft.com/en-US/xamarin/android/platform/files/
same for ios:
https://learn.microsoft.com/en-US/xamarin/ios/app-fundamentals/file-system
But it's really easy to implement, just enumerate all folders and display them in a ListView.
EDIT: more details on implementation.
In fact you want to code a "directory explorer", it's easy, here is the concept.
You have a ListView in your Page
You have a Cancel button and a Select button in your Page
You have a CurrentPath in your ViewModel
You bind CurrentPath to the Title of your Page
You have an List<DirectoryViewModel> Directories in your ViewModel
Each time a user click on a item from the list:
You add the directory name in your current path
You get all the directories from the new path, and update your Directories property (don't forget RaisePropertyChange(nameof(Directories)))
The ListView will be updated accordingly
Each time you back:
You remove last part of your current path
same as before
If you arrive to root path "/", you do nothing when clicking on back.
Oh and you could use this Grid component to instead of the ListView, will be nicer ;)
https://github.com/roubachof/Sharpnado.Presentation.Forms#grid-Layout
You can edit this to make it work..
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Java.IO;
using Java.Util;
namespace Android.Basic.IO
{
public class DirectoryPicker : ListActivity
{
public const String START_DIR = "startDir";
public const String ONLY_DIRS = "onlyDirs";
public const String SHOW_HIDDEN = "showHidden";
public const String CHOSEN_DIRECTORY = "chosenDir";
public const int PICK_DIRECTORY = 43522;
private File dir;
private Boolean showHidden = false;
private bool onlyDirs = true;
public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
{
base.OnCreate(savedInstanceState, persistentState);
Bundle extras = Intent.Extras;
dir = OS.Environment.ExternalStorageDirectory;
if (extras != null)
{
String preferredStartDir = extras.GetString(START_DIR);
showHidden = extras.GetBoolean(SHOW_HIDDEN, false);
onlyDirs = extras.GetBoolean(ONLY_DIRS, true);
if (preferredStartDir != null)
{
File startDir = new File(preferredStartDir);
if (startDir.IsDirectory)
{
dir = startDir;
}
}
}
SetContentView(Resource.Layout.folder_chooser_activity);
var title = dir.AbsolutePath.ToString();
Title = (title);
Button btnChoose = (Button)FindViewById(Resource.Id.btnChoose);
String name = dir.Name;
if (name.Length == 0)
name = "/";
btnChoose.Text = ("Choose " + "'" + name + "'");
btnChoose.Click += delegate
{
returnDir(dir.AbsolutePath);
};
ListView lv = this.ListView;
lv.TextFilterEnabled = (true);
if (!dir.CanRead())
{
Context context = ApplicationContext;
String msg = "Could not read folder contents.";
Toast.MakeText(context, msg, ToastLength.Long).Show();
return;
}
var files = filter(dir.ListFiles(), onlyDirs, showHidden);
String[] names = Names(files);
ListAdapter = (new ArrayAdapter<String>(this, Resource.Layout.folder_chooser_item, names));
lv.ItemClick += (ff, gg) =>
{
var position = gg.Position;
if (!files[gg.Position].IsDirectory)
return;
String path = files[position].AbsolutePath;
var intent = new Intent(this, typeof(DirectoryPicker));
intent.PutExtra(DirectoryPicker.START_DIR, path);
intent.PutExtra(DirectoryPicker.SHOW_HIDDEN, showHidden);
intent.PutExtra(DirectoryPicker.ONLY_DIRS, onlyDirs);
StartActivityForResult(intent, PICK_DIRECTORY);
};
}
protected void OnActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == PICK_DIRECTORY && resultCode == (int)Result.Ok)
{
Bundle extras = data.Extras;
String path = (String)extras.Get(DirectoryPicker.CHOSEN_DIRECTORY);
returnDir(path);
}
}
private void returnDir(String path)
{
Intent result = new Intent();
result.PutExtra(CHOSEN_DIRECTORY, path);
SetResult(Result.Ok, result);
Finish();
}
public List<File> filter(File[] file_list, bool onlyDirs, bool showHidden)
{
var files = new List<File>();
foreach (var file in file_list)
{
if (onlyDirs && !file.IsDirectory)
continue;
if (!showHidden && file.IsHidden)
continue;
files.Add(file);
}
Collections.Sort(files);
return files;
}
public String[] Names(List<File> files)
{
String[] names = new String[files.Count];
int i = 0;
foreach (var file in files)
{
names[i] = file.Name;
i++;
}
return names;
}
}
}
Start activity as result then catch in OnActivityResult
if (requestCode == DirectoryPicker.PICK_DIRECTORY && resultCode == Result.Ok)
{
Bundle extras = data.Extras;
String path = (String)extras.Get(DirectoryPicker.CHOSEN_DIRECTORY);
// do stuff with path
}
I'm develop cross-platform mobile application that use NFC. I already check the xamarin android beam sample here. Now i'm trying implement the same sample using xamarin forms so i'm using dependency service to call the function from android project.
I already create Ndef message and send function:
using System;
using System.Text;
using Android.App;
using MyApp.Droid;
using Android.Nfc;
using Xamarin.Forms;
[assembly: Dependency(typeof(PhoneBeam))]
namespace MyApp.Droid
{
public class PhoneBeam : Activity, NfcAdapter.ICreateNdefMessageCallback, NfcAdapter.IOnNdefPushCompleteCallback, iBeam
{
private NfcAdapter nfcAdapter;
public void Beam()
{
nfcAdapter = NfcAdapter.GetDefaultAdapter(MainActivity.Instance);
nfcAdapter.SetNdefPushMessageCallback(this, MainActivity.Instance);
nfcAdapter.SetOnNdefPushCompleteCallback(this, MainActivity.Instance);
}
public NdefMessage CreateNdefMessage(NfcEvent evt)
{
DateTime time = DateTime.Now;
var text = ("Beam me up!\n\n" + "Beam : " +
time.ToString("HH:mm:ss"));
NdefMessage msg = new NdefMessage(
new NdefRecord[]{ CreateMimeRecord (
"application/com.companyname.MyApp",
Encoding.UTF8.GetBytes (text)) });
return msg;
}
public NdefRecord CreateMimeRecord(String mimeType, byte[] payload)
{
byte[] mimeBytes = Encoding.UTF8.GetBytes(mimeType);
NdefRecord mimeRecord = new NdefRecord(
NdefRecord.TnfMimeMedia, mimeBytes, new byte[0], payload);
return mimeRecord;
}
public void OnNdefPushComplete(NfcEvent e){}
}
}
However, I really don't know how to receive a message. In android beam sample, they implement it in mainactivity. Here's sample:
protected override void OnResume ()
{
base.OnResume ();
if (NfcAdapter.ActionNdefDiscovered == Intent.Action) {
ProcessIntent (Intent);
}
}
void ProcessIntent (Intent intent)
{
IParcelable [] rawMsgs = intent.GetParcelableArrayExtra (
NfcAdapter.ExtraNdefMessages);
NdefMessage msg = (NdefMessage) rawMsgs [0];
mInfoText.Text = Encoding.UTF8.GetString (msg.GetRecords () [0].GetPayload ());
}
So i want to implement in class file so i can use dependencyService. Is there a way to implement this?
Edit: I did the send function:
public NdefMessage CreateNdefMessage (NfcEvent evt)
{
DateTime time = DateTime.Now;
var text = ("Beam me up!\n\n" +
"Beam Time: " + time.ToString ("HH:mm:ss"));
NdefMessage msg = new NdefMessage (
new NdefRecord[] { CreateMimeRecord (
"application/com.companyname.MyApp", Encoding.UTF8.GetBytes (text))
});
return msg;
}
But it return as "NEW TAG COLLECTED: application/com.companyname.MyApp". I want to resume MyApp and show the message. But it didn't.
I have a web api call that I recently added to my app. I returns a complete list of all countries, states and cities in the app (currently 486 rows) I perform this call when all of the reference data for my application loads (I have a base loading page and call the function in my startup class to load all the data there). The challenge is that the call to get all my countries.... hangs and eventually I get "The operation was canceled" error. If I modify my stored procedure that selects the data from the database on the server to only return say 20 rows, it runs fine. Any suggestions?
Below is the code from the startup class:
using System;
using System.Diagnostics;
using System.Threading.Tasks;
namespace GBarScene
{
class StartUpClass
{
public event GeneralDataLoad BaseDataLoadComplete;
public async Task<GBSStartUpEventArgs> ProcessStartup()
{
GBSStartUpEventArgs lobj_EventArgs;
lobj_EventArgs = new GBSStartUpEventArgs();
App.InStartUpDataLoad = true;
try
{
if (!App.IsGeolocationEnabled)
{
lobj_EventArgs.ErrorOccurred = true;
lobj_EventArgs.ShowRetry = true;
lobj_EventArgs.ShowWebSite = false;
lobj_EventArgs.ErrorMessage = resourcestrings.GetValue("NoLocationServicesMessage");
}
else if (!App.InternetIsAvailable)
{
lobj_EventArgs.ErrorOccurred = true;
lobj_EventArgs.ErrorMessage = resourcestrings.GetValue("NoInternetConnectionFound");
lobj_EventArgs.ShowRetry = true;
lobj_EventArgs.ShowWebSite = false;
}
else
{
Debug.WriteLine("Process StartUp");
await Task.Delay(500);
//Reset values
ViewModelObjects.DayOfWeek.DataLoadProcessed = false;
ViewModelObjects.Languages.DataLoadProcessed = false;
if (await ViewModelObjects.DayOfWeek.LoadData() == false)
// //try it once more
await ViewModelObjects.DayOfWeek.LoadData();
Debug.WriteLine("GBar After DayofWeek Load");
await ViewModelObjects.Languages.LoadData();
Debug.WriteLine("GBar After Languages Load");
if ((ge_AppMode)ViewModelObjects.AppSettings.AppMode == ge_AppMode.CitySelected)
{
//We need to reload the NearbyCities and set the selected one
await ViewModelObjects.NearbyCities.LoadData();
}
Debug.WriteLine("Before load of coutries");
await ViewModelObjects.CountryStateCity.LoadData();
Debug.WriteLine("After load of coutries");
Debug.WriteLine("Count: " + ViewModelObjects.CountryStateCity.CountryItems_ForList.Count.ToString());
ViewModelObjects.NumberOfResults.LoadData();
ViewModelObjects.Perspectives.LoadData();
ViewModelObjects.SearchRadiuses.LoadData();
ViewModelObjects.UseMetric.LoadData();
while (!ViewModelObjects.DayOfWeek.DataLoadProcessed && !ViewModelObjects.Languages.DataLoadProcessed && !App.IsGeolocationEnabled)
{
await Task.Delay(100);
}
if (App.BaseDataLoadError)
{
lobj_EventArgs.ErrorOccurred = true;
lobj_EventArgs.ShowRetry = true;
lobj_EventArgs.ShowWebSite = true;
lobj_EventArgs.ErrorMessage = resourcestrings.GetValue("ErrorLoadingReferenceData");
}
}
Debug.WriteLine("StartUp Process Ended");
BaseDataLoadComplete(this, lobj_EventArgs);
}
catch (Exception ex)
{
App.ProcessException(ex);
}
App.InStartUpDataLoad = false;
return lobj_EventArgs;
}
}
}
This is the helper class that makes all the WebAPI calls:
using Newtonsoft.Json;
using System;
using System.Diagnostics;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace GBarScene
{
public class WebAPICaller: IDisposable
{
HttpClient iobj_HTTPClient = null;
public void Dispose()
{
if (iobj_HTTPClient != null)
iobj_HTTPClient.Dispose();
}
public async Task<string> HTTPGetWebServiceAsync(string ps_URI)
{
string ls_Response = "";
string ls_JSONData = "";
string ls_Prefix = "";
try
{
iobj_HTTPClient = await GetClient();
switch (Device.RuntimePlatform)
{
case Device.Android:
ls_Prefix = App.APIStandardPrefix;
break;
//case Device.Android:
// ls_Prefix = App.APISecurePrefix;
// break;
//case Device.Windows:
//case Device.WinPhone:
// ls_Prefix = App.APISecurePrefix;
// break;
default:
ls_Prefix = App.APISecurePrefix;
break;
}
Debug.WriteLine("before api call");
iobj_HTTPClient.BaseAddress = new Uri(ls_Prefix);
ls_JSONData = await iobj_HTTPClient.GetStringAsync(ps_URI);
Debug.WriteLine("after api call");
ls_Response = System.Net.WebUtility.HtmlDecode(ls_JSONData);
}
catch (Exception ex)
{
Debug.WriteLine("api call error");
App.ProcessException(ex);
}
return ls_Response;
}
public async Task<bool> HTTPPostWebService(string ps_URI, object pobj_BodyObject)
{
HttpResponseMessage lobj_HTTPResponse = null;
bool lb_Response = false;
HttpContent lobj_Content = null;
try
{
if (iobj_HTTPClient != null)
iobj_HTTPClient = await GetClient();
iobj_HTTPClient.BaseAddress = new Uri(App.APISecurePrefix);
lobj_Content = new StringContent(JsonConvert.SerializeObject(pobj_BodyObject == null ? "" : pobj_BodyObject));
lobj_Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
lobj_HTTPResponse = await iobj_HTTPClient.PostAsync(ps_URI, lobj_Content);
if (!lobj_HTTPResponse.IsSuccessStatusCode)
{
Exception lobj_Exception = new Exception(lobj_HTTPResponse.ToString());
lobj_Exception.Source = "HTTPGetWebService for: " + ps_URI;
App.ProcessException(lobj_Exception);
}
else
{
lb_Response = true;
}
}
catch (Exception ex)
{
App.ProcessException(ex);
}
finally
{
if (lobj_HTTPResponse != null)
{
lobj_HTTPResponse.Dispose();
}
//Debug.WriteLine("WebAPICaller-CallWebService-1: Done");
}
return lb_Response;
}
private async Task<HttpClient> GetClient()
{
HttpClient lobj_HTTPClient = null;
if (lobj_HTTPClient == null)
{
lobj_HTTPClient = new HttpClient();
lobj_HTTPClient.DefaultRequestHeaders.Add("Accept", "application/json");
lobj_HTTPClient.MaxResponseContentBufferSize = 2147483647;
lobj_HTTPClient.Timeout = new TimeSpan(0,0,0,0,60000);
}
return lobj_HTTPClient;
}
}
}
Sorry I forget to include the method in the CountryStateCity view model that calls the webapi helper class.
public async Task<bool> LoadData()
{
string ls_Response = "";
string ls_WorkURI = "";
WebAPICaller lobj_WebAPICaller = null;
bool lb_DataLoaded = false;
try
{
IsDataLoaded = false;
//Debug.WriteLine("City Data Load");
lobj_WebAPICaller = new WebAPICaller();
ls_WorkURI = ic_CoutryStateCityAPIUrl.Replace("{Language}", "EN");
ls_Response = await lobj_WebAPICaller.HTTPGetWebServiceAsync(ls_WorkURI);
if (ls_Response.Trim().Length == 0)
{
AddErrorEntry();
}
else
{
CountryItems_ForList = new ObservableCollection<GBSCountry_ForList>();
StateItems_ForList = new ObservableCollection<GBSState_ForList>();
CityItems_ForList = new ObservableCollection<GBSCity_ForList>();
iobj_CountryStateCity = JsonConvert.DeserializeObject<ObservableCollection<GBSCountryStateCity>>(ls_Response);
//Now load the display lists
CountryItems_ForList = new ObservableCollection<GBSCountry_ForList>(
(from lobj_Country in iobj_CountryStateCity
select new GBSCountry_ForList()
{
ID = lobj_Country.Country_Code,
Value = lobj_Country.Country_Name_Text
}).Distinct().ToList());
CountryItems_ForList.Insert(0, new GBSCountry_ForList
{
ID = "XX",
Value = "Base Value"
});
lb_DataLoaded = true;
}
}
catch (Exception ex)
{
AddErrorEntry();
App.ProcessException(ex);
}
finally
{
IsDataLoaded = true;
if (lobj_WebAPICaller != null)
lobj_WebAPICaller.Dispose();
}
return lb_DataLoaded;
}
So after much time, I believe I figured out what the problem is. The problem started to manifest itself again with smaller amounts of data and I could not figure out why. The problem appeared. The issue appears to be the IP address I was using. (I was using the IP address of the actual laptop I was hosting both the App and WebAPIs on.) It appears you have to use one of the other network adaptors for the emulator to have this work reliably.
Here are the steps I used to resolved this:
I launched my Windows 10 mobile emulator.
Click on the >> (Tools) icon in the tool bar of the emulator.
Click on the Network tab of the Additional Tools window.
Look in the list for the network adaptor labeled Desktop Adaptor #1 and copy the IP address.
Edit the Applicationhost.config file in the folder of the WebAPI project.
Find the entry in the file for site name="XXXXX" where XXXXX is the name of the Visual Studio project you are hosting your WebAPIs in.
Within the section of the entry for your WebAPI project, add a binding for the IP address you copied from in step 4. It should look something like this:
<binding protocol="http" bindingInformation="*:56952:169.254.69.220" />
Where 56952 is the port my IIS Express is hosting the WebAPIs on and 169.254.69.220 is the IP address I copied from step 4. After adding this, I was able to connect to locally hosted WebAPIs in IIS Express.
Hope this helps.