ASP.NET Web PDF Document Viewer/Editor Control Library

I Note When working with indexers with a name other than Item, remember that it will be difficult for

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Let s take a line-by-line look at weatherForecastAjaxjsp to learn what the Taconite framework is doing The first line of the file is simply the JSP taglib declarations for the Taconite taglib The tac:taconiteRoot tag is the root tag for all Taconite responses Under the covers Taconite always returns an XML document to the browser Embedded within that XML is either JavaScript (if the parsing has been done on the server) or XHTML (if parsing is to be done on the browser) The tac:taconiteRoot emits the root tag for the return XML All JSPs using the Taconite tag library must use the tac:taconiteRoot tag Every time an Ajax request is made to update the weather forecast, two items in the weather forecast component must be updated: the location (in case the ZIP code for the weather forecast location has changed) and the actual forecast.

Figure A-16. Removing a solder bridge Another problem is solder covering a hole where you need to insert a part. Usually a technique similar to the bridge removal will work to clear the hole. Just coax the solder down the copper track away from the blocked hole with the soldering iron. You can also melt the solder while pushing the component lead into the hole. Because all the holes in a column are connected anyway, you can substitute placing a part into a nearby hole that isn t blocked. There s also a product called unsoldering braid that will wick up extra solder when heated along with the solder.

Static methods are like instance methods, except they are not specific to any instance of a class so have no access to the class s fields. To create a static method, you use the keyword static, followed by the keyword member. Then comes the method name, its parameters, an equals sign, and then the method definition. This is basically the same as declaring an instance method, just with the addition of the keyword static and the removal of the parameter that represents the object. Removing the parameter that represents the object is quite logical because the method has no access to the object s properties. The following example shows the definition of a static method, rev_string, associated with a class, MyClass: #light type MyClass = class static member revString (s : string) = let chars = s.ToCharArray() in let reved_chars = Array.rev chars in new string(reved_chars) end let myString = MyClass.revString "dlrow olleH" print_string myString The results of the previous example, when compiled and executed, are as follows: Hello world

You will notice from the previous example that the static methods called use the name of the type they are associated with, rather than a value of the type with which the method is associated. Static methods can also be useful for providing operators for your classes to use. The basic syntax for declaring an operator is the same as for declaring any other static method, except the name of the method is replaced by the operator in brackets. The parameters of the operator must be given as a tuple and typically need type annotations to indicate their types. The following example assumes that for some reason you want to reimplement the int type in a class called MyInt. The MyInt class has a plus operator defined on it. #light type MyInt(state:int) = class member x.State = state static member ( + ) (x:MyInt, y:MyInt) : MyInt = new MyInt(x.State + y.State) override x.ToString() = string_of_int state end let x = new MyInt(1) let y = new MyInt(1) printfn "(x + y) = %A" (x + y) The results of the previous example, when compiled and executed, are as follows: (x + y) = 2

Figure A-17. Top side of the finished voltage input The bottom view is in Figure A-18, and you might notice that the unused pins of the LM324 haven t been soldered at all. You can solder these pins if you want, but the step is unnecessary and you are more likely to create solder bridges.