如何使用长Web服务异步更新asp.net页

Question

Here is my simulated process: a web service FindPrimeNumbers(int Num) will find a number of prime numbers equal to the input value. For example, if (Num = 1000), then FindPrimeNumber(1000) will find the first 1000 primes starting with 1, 2, 3 etc. Whenever a prime number is found, it should update the web page by appending the new prime number to a label.

I am thinking to use .net web api as my service. What I don't know is how to (raise an event?) update the web page whenever a prime is found.

Thanks for the help.

Answer 1

ajax wouldn't work here - it's either success or error . Think about it this way - if your web service was returning json and you flushed a partial response, it would end up looking like {'test': 'fun ; it would be unparsable and of no use.

You'd need to use a WebSocket instead as LB mentioned. This will allow you to open a connection and raise events on the server and client side between the two as you please. Here's a link with browsers that support. (currently Chrome/FF/Safari/IE10+)

Answer 2

I have thought about something like this before, but I still don't have a chance to actually work on it. My suggestion is to have a look at SignalR . Somehow, you will execute a long-run function in the code behind. Then it will run and update client everytime there is new result until its done.