By Keyvan Nayyeri
ASP.NET SignalR is the recent strategy to real-time communique among servers and consumers in .NET. Use it to push new facts to an online web page or cellular gadget once it turns into on hand, no matter if it’s a notification, stay chat, up to the moment monetary info, or more than a few different intriguing purposes. suggestions like Google reside seek and dwell fb and Twitter updates are pushing users’ expectancies of the real-time internet. With Pro ASP.NET SignalR, you could subscribe to this revolution and study abilities that would be worthwhile for years to come.
Pro ASP.NET SignalR begins with an creation to the real-time net. find out about the applied sciences underlying the SignalR library, comparable to WebSockets and long-polling, and the way SignalR elegantly flips among them counting on the features of the customer. subsequent, meet the strategies of hubs and protracted connections and the way to take advantage of them to construct the elements of an ASP.NET SignalR program. tips on how to expand, try out, debug, configure, scale, and host your purposes, and the way to focus on a variety of consumers, together with home windows and iOS.
The publication rounds off with case studies—a inventory industry expense updater, and a collaborative drawing application—so you may get to grips with SignalR in a practical state of affairs, utilizing a extensive diversity of the strategies lined in past chapters.
As real-time updates to net and cellular apps develop into the norm, Pro ASP.NET SignalR may be your in-depth, one-stop significant other to this new and fascinating technology.
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Finally, there are limitations that are outside of your controllable environment that can limit your applications. 5 runtime because the server code uses the Async and Await keywords extensively. When IIS is run on client OSs such as Windows 7 or Windows 8, there is a limitation of up to ten concurrent connections, whereas the server OSs are generally limited only by the amount of server resources. Use of the Web Sockets protocol is limited by a few factors. The first factor is that in IIS-hosted applications, the Web Sockets protocol is supported only on IIS 8, IIS 8 express, or later versions of IIS that require the use of Windows Server 2012 or later.
NET SignalR Server Hub 1 Hub 2 Hub 3 Method 1 Method 2 Method 3 . . Method N Method 1 Method 2 Method 3 . . Method N Method 1 Method 2 Method 3 . . Method N Client 1 Client 2 Client 3 Client 4 Method 1 Method 2 . . Method N Method 1 Method 2 . . Method N Method 1 Method 2 . . Method N Method 1 Method 2 . . Method N Figure 3-1. General hub structure How does it work in general? This question is critical: making calls from the client(s) to server is a fairly common task, but making calls from the server to a particular client (or all clients) is not.
55 Chapter 3 ■ Developing SignalR Applications Using Hubs Listing 3-17. Code { public class Person { public string Name { get; set; } public string Message { get; set; } public string Group { get; set; } } } The server-side hub is modified to allow clients to join and leave groups and also send a message to the groups that the user is a member of (see Listing 3-18). Listing 3-18. ConnectionId, groupName); } } } Here we use the Group property of Clients to broadcast the message to only a particular group name rather than everyone.