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You can think of an event in F# as a collection of functions that can be triggered by a call to a function. The idea is that functions will register themselves with the event, the collection of functions, to await notification that the event has happened. The trigger function is then used to give notice that the event has occurred, causing all the functions that have added themselves to the event to be executed. I will cover the following features of the Event module: Creating and handling events: The basics of creating and handling events using the create and add functions. The filter function: A function to filter the data coming into events. The partition function: A function that splits the data coming into events into two. The map function: A function that maps the data before it reaches the event handler. generate qr code asp.net mvc Dynamically generate and display QR code Image in ASP . Net 5 Nov 2014 ... 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There are a lot of free web-services for generating a qr - codesfor you, ( like http:// qrcode .kaywa.com/ ) But this time I did not ... asp.net qr code generator open source Generate QR Code and display image dynamically in asp . net using c 29 Dec 2018 ... This tutorial shows How to generate QR Code and display and save QR Codeimage to folder in asp . net using c# using Google chart API and ... MyCallback), null); In this case, the BeginInvoke() will still return the same IAsyncResult object, but the code doesn t need to use it to monitor progress because the CLR will automatically call the callback method as soon as the asynchronous operation is complete Callbacks don t provide any information about why they were triggered They don t even provide the delegate object that you used to start the asynchronous processing That means that if you re handling several asynchronous tasks with the same callback, you can t easily tell which operation has completed when the callback fires To get around this limitation, you can send an additional object using the last parameter of the BeginInvoke() method This object is then provided through the IAsyncResultAsyncState parameter in the callback method You can use any object, including an instance of a custom class that records the details of the original operation. generate qr code asp.net mvc Dynamically Generating QR Codes In C# - CodeGuru 10 Jul 2018 ... Net" library to generate a QR Code and read data from that image. ... Netpackage in your application, next add an ASPX page named ... asp.net qr code generator open source Dynamically generate and display QR code Image in ASP . Net 5 Nov 2014 ... Net in C# and VB. Net . For generating QR Codes I will make use of QRCoderwhich is an Open Source Library QR code generator . TAGs: ASP . One useful trick is to provide the original delegate object (in this case, the doSomething delegate) as part of that custom class This way, you can easily complete the call in the callback by calling EndInvoke() on the provided delegate Otherwise, it s up to you to keep the delegate reference around for later.. The first example looks at a simple event being created using by call the constructor of the Event object, you should pass a type parameter to the construct representing the type of event you want. This object contains a Trigger function and a property that represents the event itself called Publish. You use the event s Publish property s Add function to add a handler method, and finally you trigger the event using the trigger function: let event = new Event<string>() event.Publish.Add(fun x -> printfn "%s" x) event.Trigger "hello" The result of this code is as follows: Here s an example that starts an asynchronous task with a callback and sends an additional state parameter. In this example, the state object is simply the delegate that made the call: doSomething.BeginInvoke(originalValue, new AsyncCallback(this.MyCallback), doSomething); And here s how you can retrieve the result in the callback: private void MyCallback(IAsyncResult async) { // Retrieve the delegate. DoSomethingDelegate doSomething = (DoSomethingDelegate)async.AsyncState; // Use it to retrieve the result. int doubleValue = doSomething.EndInvoke(async); // (Do something with the retrieved information.) } It s important to realize that callbacks are actually executed on the same thread as the asynchronous delegate, not the main thread of your application. This fact can cause a host of problems if you don t take it into account. For example, if you try to update an existing object, you could run into synchronization problems (where two threads try to update the same data at once). Similarly, you can t modify the properties of an existing UI control from a separate thread, or you may introduce other obscure errors and trigger unexpected exceptions. The only solution to these problems is to marshal your call to the right user interface thread, or use some type of synchronization. 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