Simple .NET/ASP.NET PDF document editor web control SDK

The tac:taconiteRoot tag has two tac:replaceChildren tags as its direct children The first tac:replaceChildren tag updates the forecast location, and the second one updates the weather forecast The tac:replaceChildren tags are where the real work is being done to generate the newly updated content The tac:replaceChildren tag says, Replace all the children of the element with the specified id attribute value with the following content The tac:replaceChildren tag has one required attribute, contextNodeID, that specifies the node whose children will be replaced with the content of the tac:replaceChildren tag In this case, the contextNodeID attribute of the first tac:replaceChildren tag has a value of forecastLocation A look at Listing 8-3 will show a span element with an id attribute value of forecastLocation The tac:replaceChildren tag is telling the Taconite framework that any child elements of the forecastLocation span element should be replaced with the content specified within the tac:replaceChildren tag.

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When overriding methods from non-F# libraries, the method definition must be in the tuple style, that is, surrounded by brackets and separated by commas. If you need to use a method like this as a value, then you will need to create an F# function from the method. The following sample shows a class that implements the interface System.Net.ICredentials. Its single method, GetCredential, has two parameters. Just after the interface has been implemented, the example demonstrates using it as a value in the method GetCredentialList. #light type CredentialsFactory() = class interface System.Net.ICredentials with member x.GetCredential(uri, authType) = new System.Net.NetworkCredential("rob", "whatever", "F# credentials") member x.GetCredentialList uri authTypes = let y = (x :> System.Net.ICredentials) let getCredential s = y.GetCredential(uri, s) List.map getCredential authTypes end I discuss the relationship between F# signatures and C# signatures in 13.

Figure A-19. PCF8574 kit parts One very important part in the kit is the NXT-compatible socket shown in Figure A-20. You can buy extra sockets like these for your other sensor projects, which can save you from cutting cables to connect your project to the NXT. The board also has a location for a second NXT socket, so you can easily daisy chain multiple PCF8574s using the same sensor port. However, each board must have its own I2C address, and you populate the 82k resistors on only one of the boards.

The specified content comes from the weatherLocationjsp file, which, as you ve seen previously, simply renders the location to which the weather forecast applies The second tac:replaceChildren tag rebuilds the actual weather forecast The contextNodeID attribute in this case has a value of weatherContent Looking back at Listing 8-3, you ll see a div tag with an id attribute value of weatherContent So, all the children of the weatherContent div tag will be replaced with the content specified by the second tac:replaceChildren tag The content comes from the weatherTablejsp file (Listing 8-5), which simply builds the table containing the weather forecast In this example, each tac:replaceChildren tag has an attribute named parseOnServer This is an optional attribute that defaults to true if the attribute is omitted.

Delegates are the mechanism both C# and Visual Basic use to treat their methods as values. A delegate basically acts as a .NET object that wraps the method and provides an invoke method so it can be called. There is rarely a need to define delegates in F# because it can treat a function as a value without the need for any wrapper. However, sometimes they are useful to define delegates to expose F# functionality to other .NET languages in a friendlier manner and to define callbacks for directly calling C code from F#. To define a delegate, you use the keyword delegate followed directly by the keyword of and then the type of the delegate s signature, which follows the standard F# type annotation notation. The next example shows the definition of a delegate, MyDelegate, which takes an int and returns unit. You then create a new instance of this delegate and apply it to a list of integers. As you ve already seen in 3, there are much shorter ways of implementing this functionality in F#. #light type MyDelegate = delegate of int -> unit let inst = new MyDelegate (fun i -> print_int i) let ints = [1 ; 2 ; 3 ] ints |> List.iter (fun i -> inst.Invoke(i)) The results of this example, when compiled and executed, are as follows: 123