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Properties can also be declared static. Accessors of static properties, like all static members Cannot access instance members of a class although they can be accessed by them Exist regardless of whether there are instances of the class Must be referenced by the class name, rather than an instance name, when being accessed from outside the class For example, the following code shows a class with a static property called MyValue that is associated with a static field called myValue. In the first three lines of Main, the property is accessed, even though there are no instances of the class. The last line of Main calls an instance method that accesses the property from inside the class. class Trivial { static int myValue; public static int MyValue { set { myValue = value; } get { return myValue; } } public void PrintValue() Accessed from inside the class { Console.WriteLine("Value from inside: {0}", MyValue); } } class Program { static void Main() Accessed from outside the class { Console.WriteLine("Init Value: {0}", Trivial.MyValue); Trivial.MyValue = 10; Accessed from outside the class Console.WriteLine("New Value : {0}", Trivial.MyValue); Trivial tr = new Trivial(); tr.PrintValue(); } }

}

If any of the code in the try block throws an exception, the runtime looks to see if there are any catch blocks whose exception type matches the type of that exception. It matches successfully if the catch parameter is either of the same type, or of a less-derived (base) type than that of the exception. You can have any number of catch blocks for different types of exceptions, and it will look through them in the order they are defined; the first one that matches wins (even if there is a better match farther down). If it doesn t find a suitable match, the exception will be propagated on up the call stack, just as though there was no try block. To see how this works in practice, let s quickly modify the code in Example 6-14 to catch Exception as well, as shown in Example 6-15.

try { ... } catch (Exception e2) { Console.WriteLine("Caught generic exception..."); } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } finally { Console.WriteLine("Waiting in the finally block..."); Console.ReadKey(); }

If you try to compile this, you ll see the following error:

Init Value: 0 New Value : 10 Value from inside: 10

A previous catch clause already catches all exceptions of this or of a super type ('System.Exception')

This occurs because Exception is an ancestor of InvalidOperationException, and the clause appears first in the list of catch blocks. If we switch those around, we compile successfully, as shown in Example 6-16.

try { ... } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } catch (Exception e2) { Console.WriteLine("Caught generic exception..."); } finally { Console.WriteLine("Waiting in the finally block..."); Console.ReadKey(); }

There s a quick way to remove unwanted using directives. If you right-click anywhere on your C# code, the context menu offers an Organize Usings item. This opens a submenu that includes a Remove Unused Usings item this works out which using directives are surplus to requirements, and removes them. The submenu offers another option designed to appeal to those who like to keep their source code tidy its Remove and Sort entry can remove unused using statements and then sort the rest into alphabetical order. This menu is shown in Figure 2-2.

Methods can t be represented using JSON, because function literals aren t part of its syntax. Furthermore, the JavaScript new operator isn t part of the JSON syntax and can t be used in objects or arrays.

An instance constructor is a special method that is executed whenever a new instance of a class is created. A constructor is used to initialize the state of the class instance. If you want to be able to create instances of your class from outside the class, you need to declare the constructor public. Figure 6-12 shows the syntax of a constructor. A constructor looks like the other methods in a class declaration, except for the following: The name of the constructor is the same as the name of the class. A constructor cannot return a value.

The using directives are not the end of our simple program s encounter with namespaces. In fact, the very next line of code after these directives is also concerned with namespaces:

namespace HelloWorld { ... }

While using directives declare which namespaces our code consumes, this namespace keyword tells the compiler what namespace we plan to provide the types we write in our programs belong to namespaces just like the types in the class library.* Here, Visual Studio has presumed that we d like to put our code into a namespace named after the project we created. This is a common practice, although you re free to use whatever

* Strictly speaking, you can leave out the namespace, in which case your types will end up in the so-called global namespace. But this is considered a poor practice you ll normally want your own code to reap the same benefits that class libraries get from namespaces.

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