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Other resources can be very dangerous (e.g., code bases for ActiveX objects or Java applets), or at least highly annoying (e.g., background music) if their URLs can be influenced by an untrusted source. They need to be validated carefully, and should generally not be allowed to refer to a URL that is not under your control.

The Where and Select methods used in Example 8-4 are extension methods. The System.Linq namespace defines a static class called Enumerable which defines these and numerous other extension methods for IEnumerable<T>. Here s the signature for one of the Where overloads:

Now that you ve seen how the editor can help you complete your Block Definition XML file, you re ready to look at the complete definition in Listing 9-3. Notice the area under keys, which sets up things for the PRE. It indicates the XML element that will be used for storing and retrieving the key in your JavaScript code, so we can now uncomment the section of code that uses the API key and replace it with the following code:

public static IEnumerable<TSource> Where<TSource>( this IEnumerable<TSource> source, Func<TSource, bool> predicate)

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Notice that this is a generic method the method itself takes a type argument, called TSource here, and passes that through as the type argument T for the first parameter s IEnumerable<T>. The result is that this method extends IEnumerable<T>, whatever T may be. In other words, as long as the System.Linq namespace is in scope, all IEnumera ble<T> implementations appear to offer a Where method.

Select and Where are examples of LINQ operators standard methods that are available wherever LINQ is supported. The Enumerable class in System.Linq provides all the LINQ operators for IEnumerable<T>, but is not the only LINQ provider it just provides query support for collections in memory, and is sometimes referred to as LINQ to Objects. In later chapters, we ll see sources that support LINQ queries against databases and XML documents. Anyone can write a new provider, because C# neither knows nor cares what the source is or how it works it just mechanically translates query expressions into method calls, and as long as the relevant LINQ operators are available, it will use them. This leaves different data sources free to implement the various operators in whatever way they see fit. Example 8-6 shows how you could exploit this to provide custom implementations of the Select and Where operators.

public class Foo { public string Name { get; set; } public Foo Where(Func<Foo, bool> predicate) { return this; } public TResult Select<TResult>(Func<Foo, TResult> selector) { return selector(this); }

The attribute s value must be escaped and enclosed in quotes, as described in Section 10.5.3. For script, style sheet, and code base URLs, it must be enforced that the data is served from a web server under our control. If such URLs are allowed to be absolute paths without a host part (e.g., src="/path/file"), then it is important that the attacker does not have control over the BASE attribute of the page, if any. For URLs (e.g., image URLs and the like) that may refer to third-party sites, it must be verified that the URL is a relative or absolute HTTP URL (i.e., one that starts with /, http://, or https://).

}

These are normal methods rather than extension methods we re writing a custom type, so we can add LINQ operators directly to that type. Since C# just converts LINQ queries into method calls, it doesn t matter whether LINQ operators are normal methods or extension methods. So with these methods in place, we could write the code shown in Example 8-7.

Foo source = new Foo { Name = "Fred" }; var result = from f in source where f.Name == "Fred" select f.Name;

C# will follow the rules for translating query expressions into method calls, just as it would for any query, so it will turn Example 8-7 into this:

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