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ASP. Send information in sinalr controller of net core

2022-06-30 15:40:00 【zhoubangbang1】

obtain IHubContext Example
stay ASP.NET Core SignalR, Instances you can access IHubContext Inject through dependencies . Instances that you can inject IHubContext To the controller 、 Middleware or others DI service . The instance used sends the message to the client .

Injected into the controller IHubContext There are two methods for instance

One ：. Inject instances directly into IHubContext Add to The constructor of the controller ：

Specific steps ：

1. Inject instances directly into IHubContext Add to The constructor of the controller ：

public class HomeController : Controller
{
	private readonly IHubContext<ChatHub> _hubContext;
	public HomeController(IHubContext<ChatHub> chatHubContext)
	{
		_hubContext = chatHubContext;
	}
	public async Task<IActionResult> Index()
	{
	   
		
		return View();
	}

}

2. To configure SignalR

 public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            services.AddSignalR();
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();
            app.UseCookiePolicy();
            app.UseSignalR(routes =>
            {
                routes.MapHub<ChatHub>("/chatHub");
            });
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }

3. Generate Home View , Code ：


@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0,maximum-scale=1.0,user-scalable=no">
    <title>Test</title>
    <script src="~/lib/jquery/dist/jquery.js"></script>

</head>

<body >
    <div class="container">
        <div class="row">&nbsp;</div>
        <div class="row">
            <div class="col-6">&nbsp;</div>
            <div class="col-6">
                User..........<input type="text" id="userInput" />
                <br />
                Message...<input type="text" id="messageInput" />
                <input type="button" id="sendButton" value="Send Message" />
            </div>
        </div>
        <div class="row">
            <div class="col-12">
                <hr />
            </div>
        </div>
        <div class="row">
            <div class="col-6">&nbsp;</div>
            <div class="col-6">
                <ul id="messagesList"></ul>
            </div>
        </div>
    </div>

    <script src="~/lib/signalr/dist/browser/signalr.js"></script>


    <script type="text/javascript">

     const connection = new signalR.HubConnectionBuilder()
    .withUrl("/chatHub")
    .build();

connection.on("ReceiveMessage", (user, message, id) => { 
    const encodedMsg = user + " says " + message + "  id:" + id ;
    const li = document.createElement("li");
    li.textContent = encodedMsg;
    document.getElementById("messagesList").appendChild(li);
});

document.getElementById("sendButton").addEventListener("click", event => {
    const user = document.getElementById("userInput").value;
    const message = document.getElementById("messageInput").value;    
    connection.invoke("SendMessage", user, message).catch(err => console.error(err));
    event.preventDefault();
});

connection.start().catch(err => console.error(err));
        //connection.start();
    </script>
</body>

</html>

4. Running results ：

Two ： Injection strong typing HubContext

1. take Strong type Injection into IHubContext Add to The constructor of the controller ：

  public class HomeController : Controller
    {
      //  private readonly IHubContext<ChatHub> _hubContext;
        private  IHubContext<StronglyTypedChatHub, IChatClient> _hubContext { get; }
        public HomeController(IHubContext<StronglyTypedChatHub, IChatClient> chatHubContext)
        {
            _hubContext = chatHubContext;
        }
        public async Task<IActionResult> Index()
        {
           
            
            return View();
        }
     
    }

2. To configure SignalR

   public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();
            app.UseCookiePolicy();
            app.UseSignalR(routes =>
            {
                routes.MapHub<StronglyTypedChatHub>("/chatHub");
            });
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }

3. Generate Home View , Code ：


@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0,maximum-scale=1.0,user-scalable=no">
    <title>Test</title>
    <script src="~/lib/jquery/dist/jquery.js"></script>

</head>

<body >
    <div class="container">
        <div class="row">&nbsp;</div>
        <div class="row">
            <div class="col-6">&nbsp;</div>
            <div class="col-6">
                User..........<input type="text" id="userInput" />
                <br />
                Message...<input type="text" id="messageInput" />
                <input type="button" id="sendButton" value="Send Message" />
            </div>
        </div>
        <div class="row">
            <div class="col-12">
                <hr />
            </div>
        </div>
        <div class="row">
            <div class="col-6">&nbsp;</div>
            <div class="col-6">
                <ul id="messagesList"></ul>
            </div>
        </div>
    </div>

    <script src="~/lib/signalr/dist/browser/signalr.js"></script>


    <script type="text/javascript">

     const connection = new signalR.HubConnectionBuilder()
    .withUrl("/chatHub")
    .build();

connection.on("ReceiveMessage", (user, message, id) => { 
    const encodedMsg = user + " says " + message + "  id:" + id ;
    const li = document.createElement("li");
    li.textContent = encodedMsg;
    document.getElementById("messagesList").appendChild(li);
});

document.getElementById("sendButton").addEventListener("click", event => {
    const user = document.getElementById("userInput").value;
    const message = document.getElementById("messageInput").value;    
    connection.invoke("SendMessage", user, message).catch(err => console.error(err));
    event.preventDefault();
});

connection.start().catch(err => console.error(err));
        //connection.start();
    </script>
</body>

</html>

4. Running results ：

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