Created
June 23, 2018 13:44
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Event Based API example - how to turn this into System.Reactive Observable<Service>?
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using System; | |
using System.Reactive; | |
using System.Reactive.Linq; | |
using System.Threading.Tasks; | |
namespace ReactiveLearning | |
{ | |
class Program | |
{ | |
static void Main(string[] args) | |
{ | |
var browser = new ServiceBrowser(); | |
var observableFound = | |
Observable.FromEventPattern<ServiceFoundEventArgs>( | |
h => browser.ServiceFound += h, | |
h => browser.ServiceFound -= h) | |
.Select(e => e.EventArgs.Service); | |
var observableError = | |
Observable.FromEventPattern<ServiceSearchErrorEventArgs>( | |
h => browser.ServiceError += h, | |
h => browser.ServiceError -= h); | |
var foundSub = observableFound.Subscribe(s => | |
{ | |
Console.WriteLine($"Found service: {s.Name}"); | |
}, () => | |
{ | |
Console.WriteLine("Found Completed"); | |
}); | |
var errorSub = observableError.Subscribe(e => | |
{ | |
Console.WriteLine("ERROR!"); | |
}, () => | |
{ | |
Console.WriteLine("Error Completed"); | |
}); | |
browser.Search(); | |
Console.ReadLine(); | |
foundSub.Dispose(); | |
errorSub.Dispose(); | |
Console.WriteLine(); | |
} | |
} | |
class ServiceBrowser | |
{ | |
public EventHandler<ServiceFoundEventArgs> ServiceFound; | |
public EventHandler<ServiceSearchErrorEventArgs> ServiceError; | |
public void Search() | |
{ | |
Task.Run(async () => | |
{ | |
for (var i = 0; i < 5; ++i) | |
{ | |
await Task.Delay(1000); | |
ServiceFound?.Invoke(this, new ServiceFoundEventArgs(new Service($"Service {i}"))); | |
} | |
var r = new Random(); | |
if (r.NextDouble() > 0.5) | |
{ | |
ServiceError?.Invoke(this, new ServiceSearchErrorEventArgs()); | |
} | |
}); | |
} | |
} | |
class ServiceFoundEventArgs : EventArgs | |
{ | |
public Service Service { get; private set; } | |
public ServiceFoundEventArgs(Service service) => Service = service; | |
} | |
class ServiceSearchErrorEventArgs : EventArgs {} | |
class Service | |
{ | |
public event EventHandler<EventArgs> AddressResolved; | |
public event EventHandler<EventArgs> ErrorResolvingAddress; | |
public string Name { get; private set; } | |
public string Address { get; private set; } | |
public Service(string name) => Name = name; | |
public void ResolveAddress() | |
{ | |
Task.Run(async () => | |
{ | |
await Task.Delay(500); | |
var r = new Random(); | |
if (r.NextDouble() > 0.5) | |
{ | |
Address = $"http://{Name}.com"; | |
AddressResolved?.Invoke(this, EventArgs.Empty); | |
} | |
else | |
{ | |
ErrorResolvingAddress?.Invoke(this, EventArgs.Empty); | |
} | |
}); | |
} | |
} | |
} |
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