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

Figure 1-18 is a photograph of the Color Sensor. The small spherical dome on the front of the sensor below the letter R is the phototransistor, the one below the B is the tri-color LED, and the bottom one is actually just a decoration.

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The weather forecast data is supplied by a Web Service whose WSDL document is located at www.webservicex.net/WeatherForecast.asmx WSDL. The National Oceanic & Atmospheric Administration (NOAA) has launched its own more complete forecast Web service at weather.gov/forecasts/xml/. Each time the Ajax Dashboard is opened, the Web service is contacted for the default ZIP code s weather forecast. Once open, at regular intervals or when the ZIP code is changed, the Web service is again contacted for an updated forecast. Ajax dynamically updates the forecast during these updates, so the update is seamless and does not require a complete refresh of the page. The stock ticker window keeps track of your favorite stocks performances on the stock market. Use it to see how fast your investments are growing and thus how soon you can retire (or, sadly, how fast they re falling and how much longer you ll have to work). Enter the desired stock tickers in the text box, check the box to enable the autorefresh feature, and watch how the stock prices update throughout the day, without ever having to manually refresh the page. Like the weather forecast, the stock tracker uses Ajax and automatically updates itself at set

Interfaces can contain only abstract methods and properties. They define a contract for all classes that implement them, exposing those components that clients can use while insulating clients from their actual implementation. A class can inherit from only one base class, but it can implement any number of interfaces. Since any class implementing an interface can be treated as being of the interface type, interfaces provide similar benefits but avoid the complexities of multiple-class inheritance. You define interfaces using the keyword interface; after this, you list all the members of the interface. The types of members that interfaces can have are somewhat limited, interfaces have no constructors, and they can declare only abstract methods and properties. The following code defines an interface that declares one method, ChangeState. type MyInterface = interface abstract ChangeState : myInt : int -> unit end

Figure 1-18. NXT Color Sensor Internally, the Color Sensor looks like Figure 1-19. Most of the electronics are on the bottom of the printed circuit board with the LED and phototransistor on the top.

To implement an interface, use the keyword interface, followed by the interface name, then keyword with, then the code to affect the interface members, and then the keyword end. Member definitions are prefixed by the keyword member but otherwise are the same as the definition of any method or property. You can implement interfaces by either classes or structs; I cover how to create classes in some detail in the following sections, and I cover structs in the section Structs later in this chapter. The next example defines, implements, and uses an interface. The class Implementation implements the interface MyInterface. #light type MyInterface = interface abstract ChangeState : myInt : int -> unit end