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Windows Live Spaces (http://home.services.spaces.live.com/) is an online community where users can blog and share pictures and music. If you have a Windows Live Spaces account, select MashOut Add to Windows Live Spaces from the Projects page. A new browser window opens to the Windows Live install gadget page, shown in Figure 6-19. Click the Install button to add the mashup to your Windows Live Spaces page; Figure 6-20 shows the photo mashup in my Windows Live Spaces account. After installation, you can use Windows Live Spaces customization to move your gadget around and resize it.

Although the dynamic keyword was added mainly to support interop scenarios, it is quite capable of working with normal .NET objects. For example, if you define a class in your project in the normal way, and create an instance of that class, you can use it via a dynamic variable. In this case, C# uses .NET s reflection APIs to work out which methods to invoke at runtime. We ll explore this with a simple class, defined in Example 18-10.

class MyType { public string Text { get; set; } public int Number { get; set; } public override string ToString() { return Text + ", " + Number; } public void SetBoth(string t, int n) {

}

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To examine security issues related to cross-domain security, you first have to understand how pages from different domains may interact in the browser, and what mechanisms exist in browsers to limit such interactions.

Text = t; Number = n;

}

public static MyType operator + (MyType left, MyType right) { return new MyType { Text = left.Text + right.Text, Number = left.Number + right.Number }; }

dynamic a = new MyType { Text = "One", Number = 123 }; Console.WriteLine(a.Text); Console.WriteLine(a.Number); Console.WriteLine(a.Problem);

The lines that call ConsoleWriteLine all use the dynamic variable a with normal C# property syntax The first two do exactly what you d expect if the variable had been declared as MyType or var instead of dynamic: they just print out the values of the Text and Number properties The third one is more interesting it tries to use a property that does not exist If the variable had been declared as either MyType or var, this would not have compiled the compiler would have complained at our attempt to read a property that it knows is not there But because we ve used dynamic, the compiler does not even attempt to check this sort of thing at compile time.

In the early days of the Web, documents were delivered as plain HTML: the document s HTML markup only provided formatting and document-structure directives to the browser (BernersLee and Connolly 1995) Modern browsers, on the other hand, support Dynamic HTML (DHTML) documents that specify content, layout, and formatting (through Cascading Style Sheets [CSS]), as well as behavior (in the form of associated client-side script) (Raggett, Le Hors, and Jacobs 1999; Bos et al 1998) Different browsers support different client-side scripting languages (eg, VBScript is supported by Internet Explorer but not Mozilla browsers), as well as different flavors of the same language For example, the variant of the JavaScript language and browser API supported by Mozilla-based browsers differs slightly from the one supported by Internet Explorer (which is called JScript) (Powell and Schneider 2004) The language has been standardized by EMCA under the name ECMAScript.

So it compiles, and instead it fails at runtime that third line throws a RuntimeBinderException, with a message complaining that the target type does not define the Problem member we re looking for This is one of the prices we pay for the flexibility of dynamic behavior: the compiler is less vigilant Certain programming errors that would be caught at compile time when using the static style do not get detected until runtime And there s a related price: IntelliSense relies on the same compile-time type information that would have noticed this error If we were to change the variable in Example 18-11 s type to either MyType or var, we would see IntelliSense pop ups such as those shown in Figure 18-1 while writing the code.

Visual Studio is able to show the list of available methods because the variable is statically typed it will always refer to a MyType object But with dynamic, we get much less help As Figure 18-2 shows, Visual Studio simply tells us that it has no idea what s available In this simple example, you could argue that it should be able to work it out although we ve declared the variable to be dynamic, it can only ever be a MyType at this point in the program But Visual Studio does not attempt to perform this sort of analysis for a couple of reasons First, it would work for only relatively trivial scenarios such as these, and would fail to work anywhere you were truly exploiting the dynamic.

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