Here is my wcfService code -
public class SystemService : ISystemService
{
private IHubContext hubContext;
public SystemService()
{
hubContext = GlobalHost.ConnectionManager.GetHubContext<WebApplication1.MyHub1>();
}
public void SendMessage(string sender, string message)
{
hubContext.Clients.All.SendMessage(sender, message);
}
}
My web application with signalR hub is working fine.
namespace WebApplication1
{
[HubName("myHub1")]
public class MyHub1 : Hub
{
public void SendMessage(string name, string message)
{
// Call the broadcastMessage method to update clients.
Clients.All.broadcastMessage(name, message);
}
}
}
Only the messages from wcf client are not received.
No error messages in tracelog. If possible can anyone advice what I am missing here.
please ask if any other details needed.
Changed the code to generate a proxy. And working now.
public class SystemService : ISystemService
{
private readonly IHubProxy proxy;
// private IHubContext hubContext;
public SystemService()
{
var con = new HubConnection("http://localhost:53098/");
proxy = con.CreateHubProxy("myHub1");
con.Start().Wait();
}
public void SendMessage(string sender, string message)
{
proxy.Invoke("SendMessage", sender, message);
//hubContext.Clients.All.SendMessage(sender, message);
}
}
But shocking, I was first trying with this method only but it didnt worked earlier.. So I tried with IhubContext as above in my question.
Related
I'm trying to implement .NET Core 2.2/SignalR 1.1.0.
In startup:
public void ConfigureServices(IServiceCollection services)
services.AddSignalR();
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
app.UseSignalR(routes =>
{
routes.MapHub<ChatHub>("/chatHub");
});
It works smoothly when I apply a one-to-one example.
But I need an architectural change.
My example:
public class ChatHub : Hub
{
ResponseHandler ResponseHandler { get; set; }
public ChatHub()
{
IHubCallerClients hubCallerClients = this.Clients;
ResponseHandler = new ResponseHandler(hubCallerClients);
}
public async Task SendMessage(string user, string message)
{
IHubCallerClients hubCallerClients = this.Clients;
await ResponseHandler.R();
}
}
If I tried to get this.Clients in the constructor it is coming with null data. But if I try to take it in the method, it comes full as expected.
I should get IHubCallerClients in the contructor so that I can forward it to another Response context.
Thanks advance!
OK. I solved the problem by
public class RequestHandler : Hub
{
ResponseHandler ResponseHandler { get; set; }
public RequestHandler(IHubContext<RequestHandler> hubContext)
{
ResponseHandler = new ResponseHandler(hubContext);
}
public async Task SendMessage(string user, string message)
{
await ResponseHandler.R();
}
}
Due to the nature of .net core, context comes to constructor as dependency.
"services.AddSignalR();" we're sure to add it to Scope.
"IHubContext hubContext" In this way, we can collect the contructured object.
Hello i am trying to understand why do my requests not enter my api route.They seem to reach the server but they wont fan out in the MVC.
The server is running on: http://localhost:9300
The route i am requesting is : http://localhost:9300/api/getusers
Program
public class Program {
public static void Main(string[] args) {
CreateWebHostBuilder(args).Build().Run();
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) {
var builder = new WebHostBuilder();
builder.UseStartup<Startup>();
var url = Address.Default.ToUrl();
builder.UseKestrel().UseUrls(url);
return builder;
}
}
Startup
public class Startup {
public Startup(IConfiguration configuration) {
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services) {
services.AddOptions();
services.AddMvc();
}
public IConfiguration Configuration;
public void Configure(IApplicationBuilder app) {
Debug.WriteLine("Entered server"); //enters successfully here
app.UseMvc(); //does not enter the controller
}
}
Controller
This is a simple controller with a GET method.The constructor is not invoked at all.Why would this happen?I know it when the server runs the first time ..it does a health check on its routes.
[ApiController]
class UserController : ControllerBase {
private static List<User> users = new List<User> {
new User{Id=0,Age=0,Name="Failed"},
new User{Id=12,Age=33,Name="Daniel"},
new User{Id=13,Age=33,Name="Marian"},
};
public UserController() {
Debug.WriteLine("Controller called"); //does not get called !
}
[HttpGet]
[Route("api/getusers")]
public async Task<HttpResponseMessage> GetUsers() {
await Task.Delay(1000);
return new HttpResponseMessage {
Content = new StringContent(users.ToJson()),
StatusCode = HttpStatusCode.OK
};
}
}
P.S Do i have to add anyything ? What am i missing i followed other implementations closely.
I've created the webapi project using dotnet new webapi.
I've managed to get to the url with the similar configuration by changing the access modifier of a similar controller. Try to add public keyword to the class UserController. So it should be public class UserController
I will provide more information about the configuration of the project if it is necessary and the step above does not help.
I am developing SignalR service using AspNetCore.SignalR.
Following is my Hub:
public class NotificationHub : Microsoft.AspNetCore.SignalR.Hub
{
public override async Task OnConnectedAsync()
{
await base.OnConnectedAsync();
}
public override async Task OnDisconnectedAsync(Exception exception)
{
await base.OnDisconnectedAsync(exception);
}
}
Following is Another Context class that i have created to invoke Hub's method on client side:
public class NotificationHubContext
{
private readonly IHubContext<NotificationHub> _context;
public NotificationHubContext(IHubContext<NotificationHub> context)
{
_context = context;
}
public async Task Broadcast(string groupId, string eventName, object data)
{
await _context.Clients.Group(groupId).SendAsync(eventName, data);
}
}
I would like to Inject reference of NotificationContext class into my own IoC Container so I can just resolve it and call a BroadCast method on it and it should handle sending messages to clients.
I am using Service Bus to listen for messages from another part of the system, once I receive a message from Queue, I would like to notify Connected clients using HubContext from QueueHandler.
Assembly Info
var hubContext = app.ApplicationServices.GetService<IHubContext<Notification>>
That resolved my issue.
I design my class as below.
public class NotificationHub : Microsoft.AspNetCore.SignalR.Hub
{
public static IHubContext<NotificationHub> Current { get; set; }
}
In your Startup class
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
NotificationHub.Current = app.ApplicationServices.GetService<IHubContext<NotificationFromServerHub>>();
}
So, you can use as like this from anywhere.
public class MyBizClass
{
public void DoSomething()
{
NotificationHub.Current.MyMethod(...);
}
}
I am using asp.net mvc applicaiton and I am new about cross cutting concers. So I need to know where can I use my logger code following example.
I have an interface that logs erros. I am implementing this interface on my code.
public interface ILogger { void Log(Exception exception); }
So I have Controller, ProductService, ProductRepository classes.
public interface ProductController: ApiController{
public IHttpActionResult Get(){
try {
productService.GetProducts();
}catch(Exception e){
logger.Log(e); // 1-Should I use logging in here?
}
}
}
Product service;
public class ProductService{
public IEnumerable<Product> GetProducts(){
try {
productRepository.GetAll();
}catch(Exception e){
logger.Log(e); // 2-Should I use logging in here?
}
}
}
In repository.
public class ProductRepository{
public IEnumerable<Product> GetAll(){
try {
}catch(Exception e){
logger.Log(e); // 3-Should I use logging in here?
}
}
}
I could not determine where can I use logging code. Or add logging in everywhere.
You can implement custom exception filter.
public class LogExceptionAttribute : ExceptionFilterAttribute
{
public ILogger logger { get; set; }
public LogExceptionAttribute(ILogger logger)
{
this.logger = logger;
}
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
var exception = actionExecutedContext.Exception;
logger.Log(actionExecutedContext.Exception);
// You could also send client a message about exception.
actionExecutedContext.Response =
actionExecutedContext.Request.CreateResponse(HttpStatusCode.InternalServerError, exception.Message);
}
}
Then register it on global level.
GlobalConfiguration.Configuration.Filters.Add(new LogExceptionAttribute(Logger));
This filter would be called for any unhandled exception thrown from controller method.
I have WebForms project, and there I have WebApi controller.
How I can inject to controller constructor and to action filter constructor?
I have implemented IDependencyResolver and use it in Global.asax (GlobalConfiguration.Configuration.DependencyResolver), but it doesn't help:
on request controller says that there is no default constructor and filter on application start says that it does not contain a constructor that takes 0 arguments.
Moreover, i need singletone injection to action filter.
Thanks.
UPD
public class ScopeContainer : IDependencyScope
{
protected readonly IUnityContainer _container;
public ScopeContainer(IUnityContainer container)
{
_container = container;
}
public object GetService(Type serviceType)
{
return _container.IsRegistered(serviceType) ? _container.Resolve(serviceType) : null;
}
public IEnumerable<object> GetServices(Type serviceType)
{
return _container.IsRegistered(serviceType) ? _container.ResolveAll(serviceType) : new List<object>();
}
public void Dispose()
{
_container.Dispose();
}
}
public class IoCContainer : ScopeContainer, IDependencyResolver
{
public IoCContainer(IUnityContainer container) : base(container)
{
}
public IDependencyScope BeginScope()
{
var child = _container.CreateChildContainer();
return new ScopeContainer(child);
}
}
public class Global : HttpApplication
{
void Application_Start(object sender, EventArgs e)
{
RegisterRoutes();
ConfigureApi(GlobalConfiguration.Configuration);
}
void ConfigureApi(HttpConfiguration config)
{
var unity = new UnityContainer();
unity.RegisterInstance<ILogger>(new Logger());
unity.RegisterType<IRepository, DbRepository>();
config.DependencyResolver = new IoCContainer(unity);
}
private static void RegisterRoutes()
{
RouteTable.Routes.MapHttpRoute("ServiceApi", "api/{controller}/{action}");
}
}
I think this may be the way you are registering your routes.
WebApi routes are registered in the default project examples via the GlobalConfiguration.Routes rather than the RouteTable.Routes which is used by MVC controllers. If the ApiController is being incorrectly loaded by the MVC routing method it won't find your dependency resolver.
Try modifying your code to this:
public class Global : HttpApplication
{
void Application_Start(object sender, EventArgs e)
{
RegisterRoutes(GlobalConfiguration.Configuration);
ConfigureApi(GlobalConfiguration.Configuration);
}
void ConfigureApi(HttpConfiguration config)
{
var unity = new UnityContainer();
unity.RegisterInstance<ILogger>(new Logger());
unity.RegisterType<IRepository, DbRepository>();
config.DependencyResolver = new IoCContainer(unity);
}
private static void RegisterRoutes(HttpConfiguration config)
{
config.Routes.MapHttpRoute("ServiceApi", "api/{controller}/{action}");
}
}
I was having the same issue, I was working on a project trying to help modernize an old web forms project by converting page by page to Web API / Angular and getting the plumbing just right to use Unity was key.
When I was tracing I noticed unity was trying to resolve the controller classes but not the types to inject into their constructors, so I registered my controllers and it all worked. See my example below
Config setup, register controller and dependency
void ConfigureApi(HttpConfiguration config)
{
var container = UnitySingleton.UnityContainer;
container.RegisterType<IDashboardManager, ExampleStuff>();
container.RegisterType<DashboardController>(new InjectionConstructor(container.Resolve<IDashboardManager>()));
config.DependencyResolver = new UnityIoCContainer(container);
}
And my controller example:
public class DashboardController : ApiController
{
private readonly IDashboardManager _dashboardManager;
public DashboardController(IDashboardManager dashboardManager)
{
_dashboardManager = dashboardManager;
}
public async Task<IEnumerable<string>> Get()
{
return await _dashboardManager.GetDatas();
}
}
This is how I got mine working. It was a little different than the article above.