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C# 4.0 introduces a new type called dynamic. In some ways it looks just like any other type such as int, string, or FileStream: you can use it in variable declarations, or function arguments and return types, as Example 18-4 shows. (The method reads a little oddly it s a static method in the sense that it does not relate to any particular object instance. But it s dynamic in the sense that it uses the dynamic type for its parameters and return value.)

static dynamic AddAnything(dynamic a, dynamic b) { dynamic result = a + b; Console.WriteLine(result); return result; }

While you can use dynamic almost anywhere you could use any other type name, it has some slightly unusual characteristics, because when you use dynamic, you are really saying I have no idea what sort of thing this is. That means there are some situations where you can t use it you can t derive a class from dynamic, for example, and typeof(dynamic) will not compile. But aside from the places where it would be meaningless, you can use it as you d use any other type.

You can see that your photo mashup is recognized as a Windows Vista Gadget, because it s displayed with the default icon for gadgets. Double-click the icon; a Windows Sidebar security dialog box is launched, asking if you want to install the gadget (see Figure 6-15).

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The final type of password system we would like to touch upon is called a one-time password system In all of the approaches that we have talked about so far, one of things that gives the attacker some advantage is that each user uses their password multiple times to log into a system Therefore, when an account is created for a user and that user chooses a password, the user is allowed to use that password multiple times to log in However, every time that a user logs into a system, there is a potential opportunity for that password to be eavesdropped on or found by an attacker This is especially a problem if that password has not changed over a long period of time In a one-time password system, every time a user logs in, the user is expected to log in with a different password.

To see the dynamic behavior in action, we can try passing in a few different things to the AddAnything method from Example 18-4, as Example 18-5 shows.

Console.WriteLine(AddAnything("Hello", "world").GetType().Name); Console.WriteLine(AddAnything(31, 11).GetType().Name); Console.WriteLine(AddAnything("31", 11).GetType().Name); Console.WriteLine(AddAnything(31, 11.5).GetType().Name);

type of the returned value. This produces the following output:

The + operator in AddAnything has behaved differently (dynamically, as it were) depending on the type of data we provided it with. Given two strings, it appended them, producing a string result. Given two integers, it added them, returning an integer as the result. Given some text and a number, it converted the number to a string, and then appended that to the first string. And given an integer and a double, it converted the integer to a double and then added it to the other double. If we weren t using dynamic, every one of these would have required C# to generate quite different code. If you use the + operator in a situation where the compiler knows both types are strings, it generates code that calls the String.Concat method. If it knows both types are integers, it will instead generate code that performs arithmetic addition. Given an integer and a double, it will generate code that converts the integer to a double, followed by code to perform arithmetic addition. In all of these cases, it would uses the static information it has about the types to work out what code to generate to represent the expression a + b. Clearly C# has done something quite different with Example 18-4. There s only one method, meaning it had to produce a single piece of code that is somehow able to execute any of these different meanings for the + operator. The compiler does this by generating code that builds a special kind of object that represents an addition operation, and this object then applies similar rules at runtime to those the compiler would have used at compile time if it knew what the types were. (This makes dynamic very different from var see the sidebar on the next page.)

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