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We rather like this approach, although some people frown on it as insufficiently discoverable. (Most developers aren t expecting to find static methods that act rather like constructors, and if nobody finds these methods, we re wasting our time in providing them.) However, this pattern is used all over the .NET Framework libraries DateTime, TimeSpan, and Color are popular types that all use this technique.

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(); }

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Navigate into the Tester folder to see the directory structure shown in Figure 8-5. This folder is where the main development of blocks occurs, and it s the root directory of the block test harness. The test harness is a way for you to develop Popfly blocks without accessing the entire Popfly environment or even having to be online. The technological base for the SDK is Microsoft s .NET, so many of the items in the SDK are specific to .NET development; you can find out general information about .NET at http://msdn2.microsoft.com/netframework/default.aspx. The bin, obj, and properties folders are used by the .NET test harness and the tools that we will be talking about later. You will notice six other files in the root directory that are used by the test harness: Default.aspx, Default.aspx.cs, Default.aspx.designer.cs,

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.

Practical stream ciphers use a finite-sized key to generate an infinite stream of key bits RC4 is an example of a practical stream cipher..

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.

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).

First, as Example 3-36 shows, we ll delete the special constructor from Plane, and then make Identifier an ordinary read/write property. We can also remove the _identifier backing field we added earlier, because we ve gone back to using an auto property.

class Plane { // Remove the constructor that we no longer require // public Plane(string newIdentifier) // { // Identifier = newIdentifier; // } public string Identifier { get; // remove the access modifier // to make it public set; } } // ...

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