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public class MyObject { public int DoubleNumber(int input) { return input * 2; } } You can create a delegate variable that points to a method with the same signature Here s the code: MyObject myObj = new MyObject(); // Create a delegate that points to the myObjDoubleNumber() method DoSomethingDelegate doSomething = new DoSomethingDelegate(myObjDoubleNumber); // Call the myObjDoubleNumber() method through the delegate int doubleValue = doSomething(12); What you may not realize is that delegates also have built-in threading smarts Every time you define a delegate (such as DoSomethingDelegate in the above example), a custom delegate class is generated and added to your assembly (A custom delegate class is needed because the code for each delegate is different, depending on the signature of the method you ve defined.

) When you call a method through the delegate, you are actually relying on the Invoke() method of the delegate class The Invoke() method executes the linked method synchronously However, the delegate class also includes methods for asynchronous invocation BeginInvoke() and EndInvoke() When you use BeginInvoke(), the call returns immediately, but it doesn t provide the return value Instead, the method is simply queued to start on another thread When calling BeginInvoke(), you supply all the parameters of the original method, plus two additional parameters for an optional callback and state object If you don t need these details (described later), simply pass a null reference IAsyncResult async = doSomethingBeginInvoke(12, null, null); BeginInvoke() doesn t return the return value of the underlying method Instead, it returns an IAsyncResult object that you can examine to determine when the asynchronous operation is complete.

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Note Even though the option to Backup Now is available when you have turned off backups, it will fail.

Prog.fs(4,25): error: FS0001: This expression has type int but is here used with type string This also has an effect on type inference. If you create a function that uses printf, then any arguments that are passed to printf will have their types inferred from this. For example, the function myPrintInt, shown here, has the type int -> unit because of the printf function contained within it: let myPrintInt x = Printf.printf "An integer: %i" x The basic placeholders in a Printf module function are %b for a Boolean; %s for a string; %d or %i for an integer; %u for an unsigned integer; and %x, %X, or %o for an integer formatted as a hexadecimal. It is also possible to specify the number of decimal places that are displayed in numeric types. The following example demonstrates this: let pi = System.Math.PI Printf.printfn Printf.printfn Printf.printfn Printf.printfn "%f" pi "%1.1f" pi "%2.2f" pi "%2.8f" pi

To pick up the results later on, you submit the IAsyncResult object to the matching EndInvoke() method of the delegate EndInvoke() waits for the operation to complete if it hasn t already finished and then provides the real return value If any unhandled errors occurred in the method that you executed asynchronously, they ll bubble up to the rest of your code when you call EndInvoke() Here s the previous example rewritten to call the delegate asynchronously:.

MyObject myObj = new MyObject(); // Create a delegate that points to the myObj.DoubleNumber() method. DoSomethingDelegate doSomething = new DoSomethingDelegate(myObj.DoubleNumber); // Start the myObj.DoubleNumber() method on another thread. IAsyncResult async = doSomething.BeginInvoke(originalValue, null, null); // (Do something else here while myObj.DoubleNumber() is executing.) // Retrieve the results, and wait (synchronously) if they're still not ready. int doubleValue = doSomething.EndInvoke(async);

Note Most of the time, the EndInvoke() method takes a single parameter the IAsyncState object. However,

If you want to perform a manual backup on a computer, you must first turn on backups for that computer.

The results of this code are as follows: 3.141593 3.1 3.14 3.14159265 The Printf module also contains a number of other functions that allow a string to be formatted in the same ways as printf itself, but allow the result to be written to a different destination. The following example shows some of the different versions available: // write to a string let s = Printf.sprintf "Hello %s\r\n" "string" printfn "%s" s // prints the string to a .NET TextWriter Printf.fprintf System.Console.Out "Hello %s\r\n" "TextWriter" // create a string that will be placed // in an exception message Printf.failwithf "Hello %s" "exception"

if your method uses out or ref parameters, the EndInvoke() method will also be responsible for supplying these values. As a result, you ll need to supply all these parameters to EndInvoke(), followed by the IAsyncState parameter.

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