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

Handling currencies is something that you have to do without the help of Qt. This is all right because currencies can be treated as a number with limited precision usually two decimals, but sometimes none or three. When you present currency values to users, it is important to remember some basics. First of all, you can always put the three-letter currency code (ISO 4217) after the value (for example, 280,00 SEK or 8.75 USD). Notice that I used the appropriate decimal point symbol depending on the currency in the examples. (You should, of course, pick a decimal point symbol depending on your user s preference.)

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With C# 3.0 the language was extended to support object initializers an extension to the new syntax that lets us set up a load of properties, by name, as we create our object instance. Example 3-35 shows how an object initializer looks when we use it in our Main function.

static void Main(string[] args) { Plane someBoeing777 = new Plane("BA0049") { Direction = DirectionOfApproach.Approaching, SpeedInMilesPerHour = 150 }; Console.WriteLine( "Your plane has identifier {0}," + " and is traveling at {1:0.00}mph [{2:0.00}kph]", // Use the property getter someBoeing777.Identifier, someBoeing777.SpeedInMilesPerHour, someBoeing777.SpeedInKilometersPerHour); someBoeing777.SpeedInKilometersPerHour = 140.0; Console.WriteLine( "Your plane has identifier {0}," + " and is traveling at {1:0.00}mph [{2:0.00}kph]", // Use the property getter someBoeing777.Identifier, someBoeing777.SpeedInMilesPerHour, someBoeing777.SpeedInKilometersPerHour); Console.ReadKey(); }

Object initializers are mostly just a convenient syntax for constructing a new object and then setting some properties. Consequently, this only works with writable properties you can t use it for immutable types, so this wouldn t work with our PolarPoint3D.

We still use the constructor parameter for the read-only Identifier property; but then we add an extra section in braces, between the closing parenthesis and the semicolon, in which we have a list of property assignments, separated by commas. What s particularly interesting is that the purpose of the constructor parameter is normally identifiable only by the value we happen to assign to it, but the object initializer is self-documenting we can easily see what is being initialized to which values, at a glance.

All currencies have names. For example, SEK is short for Swedish krona or just krona (the plural is kronor). This is also something that can be put after the value being presented. Some currencies have a sign or a symbol that can be used instead of putting a code or a name after the value. This sign can be placed either before the value, be placed after the value, or act as a decimal point symbol. Examples are 12.50 (GBP) and 12.50 (EUR). There are many more symbols available for other currencies. Some symbols are widespread, while others are used only in the local market where the currency is used. From an internationalization perspective, I recommend using the ISO 4217 codes because of neutrality (the codes are part of an international standard) and for ease of handling (the code always goes after the value).

This is a slight oversimplification. In 8, we ll encounter anonymous types, which are always immutable, and yet we can use object initializers with those. In fact, we are required to. But anonymous types are a special case.

The job isn t quite done yet, though. While there s nothing technically wrong with using both the constructor parameter and the object initializer, it does look a little bit clumsy. It might be easier for our clients if we allow them to use a default, parameterless constructor, and then initialize all the members using this new syntax. As we ll see in 6, we have other ways of enforcing invariants in the object state, and dealing with incorrect usages. Object initializers are certainly a more expressive syntax, and on the basis that self-documenting and transparent is better, we re going to change how Plane works so that we can initialize the whole object with an object initializer.

n the first two chapters, you began to get a sense for the power of Ajax and Altas and how they can help you build responsive web applications using asynchronous JavaScript and XML. 2 gave you an overview of ASP .NET 2.0 and in particular the server controls, including how you can use them to generate client-side JavaScript. This methodology is used throughout Atlas to make developing, deploying, and debugging rich client web applications as easy as possible. You also looked at some JavaScript code and how you can use this within Atlas. This chapter will go into more detail on the JavaScript libraries and APIs that Atlas provides. The chapter will start with a tour of the new features that have been added to JavaScript, such as namespaces and inheritance, so you can get a feel for how they work.

As with any design consideration, there is a counter argument. Some classes may be downright difficult to put into a default (zero-ish) state that isn t actively dangerous. We re also increasing the size of the public API by the changes we re making we re adding a public setter. Here, we ve decided that the benefits outweigh the disadvantages in this particular case (although it s really a judgment call; no doubt some developers would disagree).