.NET/ASP.NET/C#/VB.NET PDF Document SDK

object The AjaxRequest object defines methods that simplify building the query string that is sent as part of the Ajax request, including accumulating the specified form element values and even applying the appropriate encoding to the values The AjaxRequest object also handles the server s response The first line of the updateWeatherForecast function creates an instance of the AjaxRequest object, passing to its constructor the URL that will handle the Ajax request The second line is a call to the AjaxRequest object s addFormElementsById method, passing to it the id attribute of the ZIP code text box This method automatically adds the ZIP code entered by the user to the query string that will be sent to the server The addFormElementsById method can take any number of parameters.

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Properties are a special form of method that look like a value to the code that calls it. Indexers are a similar concept that makes a method look a bit like a collection to the calling code. Both properties and indexers have accessors, which include a get accessor for reading and a set accessor for writing. A property definition starts the same way as a method definition, with the keyword member followed by the parameter that represents the object, then a dot, and then the member name. After this, instead of the method parameters, you use the keyword with, followed by either get or set. Then comes the parameters; a get method must take unit, and a set method must take one single parameter. After this is an equals sign and an expression that forms the method body. If a second method is required, you use the keyword and to join them together. The following sample shows the definition of a class that has a single property, MyProp, which returns a random number. Setting the property resets the seed of the random number generator. #light type Properties() = class let mutable rand = new System.Random() member x.MyProp with get () = rand.Next() and set y = rand <- new System.Random(y) end let prop = new Properties() let print i = printfn "%d" i prop.MyProp <- 12 print prop.MyProp print prop.MyProp print prop.MyProp The results of the previous example, when compiled and executed, are as follows: 2137491492 726598452 334746691 It is also possible to declare abstract properties. The syntax is similar, the keyword member is replaced by abstract, and the parameter that represents the object is omitted, just like for a

Figure A-12. Adding solder to the connection Allow enough solder to flow around the connection, as shown in Figure A-13. You might think that the components would be instantly damaged by the high temperature of soldering. However, they re designed to tolerate it for fairly long periods, and you shouldn t be afraid to take the time to make a good joint. Remove the solder and iron and then allow the connection to cool for a few seconds before moving anything. The solder should be shiny and look almost wet when it first cools.

If there were two form elements whose values should be sent as part of the Ajax request, instead of calling the addFormElementsById method twice, you could simply call the method once and supply the two element IDs to the method, separating them with a comma The last line of the updateWeatherForecast method instructs the AjaxRequest object to send the Ajax request to the specified URL The UpdateWeatherForecastServletjava servlet, whose source code is shown in Listing 8-6, handles the Ajax request for updating the weather forecast Without getting into the gory details of accessing the Web service, this servlet simply plucks the desired ZIP code of the request object and passes it the WeatherForecastService object This object returns an instance of the WeatherForecasts object, which encapsulates all the forecast data.

method After the member name comes the name of the type separated from the member name by a colon Then follows the keyword, followed by either get or set, representing whether the inheritor must implement a get or set method, or both, separated by a comma Properties look exactly like a field to the calling code The following example shows the previous example revised so now it uses a base class, AbstractProperties You will notice how the derived class ConcreteProperties must implement the get and set methods using the keywords with and then and #light type AbstractProperties() = class abstract MyProp : int with get, set end type ConcreteProperties() = class inherit AbstractProperties() let mutable rand = new SystemRandom() override xMyProp with get() = randNext() and set(y) = rand <- new System.