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There are, of course, various restrictions regarding the use of the var keyword. First and foremost, implicit typing applies only to local variables in a method or property scope. It is illegal to use the var keyword as method return values or parameters, or as field data: class ThisWillNeverCompile { // Error! var cannot be used as field data! private var myInt = 10; // Error! var cannot be used as return values // or parameter types! public var MyMethod(var x, var y){} } As well, local variables declared with the var keyword must be assigned an initial value at the time of declaration and cannot be assigned the value of null. The first restriction makes the act of defining an implicitly typed variable look and feel like the process of defining a constant data point. This last restriction should make sense, given that the compiler cannot infer what sort of type in memory the variable would be pointing to based only on null: // Error! Must assign a value! var myData; // Error! Must assign value at time of declaration! var myInt; myInt = 0; // Error! Can't assign null! var myObj = null; It is permissible, however, to assign an inferred object local variable to null after its initial assignment: // OK! var myCar = new SportsCar(); myCar = null; Furthermore, it is permissible to assign the value of an implicitly typed local variable to the value of other variables, implicitly typed or not: // Also OK! var myInt = 0; var anotherInt = myInt; string myString = "Wake up!"; var myData = myString;

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Touchless API library manager (to use it you should have TouchlessLib.dll referenced and WebCamLib.dll copied to the output directory).

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Finally, be aware that because var is a new keyword, it is now illegal to define variables and type members using this token: // Compiler error! int var = 10;

We passed in 30 as the Age parameter (you didn t think I d put my real age in there, did you ) and set the flag to True, indicating that the birthday had passed for this year. This code was run in the year 2007, so the result I would expect to see is 1977 but that s not what we see in Figure 7-5, is it

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The goal for this example is to design a simple personal site as a sort of portal to this author s various interests, which he can keep separate from his blog. To do this, we ll use four major areas (design, programming, singing, and writing) along with a few links to favorite online destinations.

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Closely related to the topic of implicitly typed local variables is the subject of implicitly typed local arrays. Using this technique, you can allocate a new array type using syntax such as the following: // a is really int[]. var a = new[] { 1, 2, 3, 4000 }; // b is really double[]. var b = new[] { 1, 1.5, 2, 2.5 }; // c is really string[]. var c = new[] { "we", null, "are", null, "family" }; // myCars is really SportsCar[]. var myCars = new[] { new SportsCar(), new SportsCar()}; Of course, just as when you allocate an array using traditional C# syntax, the items in the array s initialization list must be of the same underlying type (all ints, all strings, all SportsCars, etc.). Thus, the following generates a compile-time error: // Error! Mixed types! var d = new[] { 1, "one", 2, "two" };

To wrap up our look at implicitly typed local variables, I d like to point out that using var as your data type declaration simply for the sake of doing so really brings little to the table. In fact, overuse of this technique can be confusing to others reading your code, as it becomes harder to quickly determine the underlying type of type (and therefore more difficult to understand the overall functionality of the variable). However, as you will see in 31, the LINQ technology set makes use of query expressions to yield dynamically created result sets based on the format of the query itself. In these cases, implicit typing is extremely helpful, as we do not need to explicitly define the type that a query may return, which saves a lot of tedious typing time. Furthermore, type inference of local variables is not the same technique used with scripting languages (such as VBScript or Perl) or the COM Variant data type, where a variable can hold values of different types over its lifetime in a program. Rather, type inference keeps the strongly typed aspect of the C# language and affects only the declaration of variables at compile time. After that point, the data point is treated as if it was declared with that type; assigning a value of a different type into that variable will result in a compile-time error: // Error! The compiler knows myVar is a string, not an integer! var s = "This variable can only hold string data!"; s = "This is fine..."; s = 44; // This is not!

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