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When the C# compiler detects a call to a method, the compiler checks all of the methods with the specified name, where no parameter has the ParamArray attribute applied . If a method exists that can accept the call, the compiler generates the code necessary to call the method . However, if the compiler can t find a match, it looks for methods that have a ParamArray attribute to see whether the call can be satisfied . If the compiler finds a match, it emits code that constructs an array and populates its elements before emitting the code that calls the selected method . In the previous example, no Add method is defined that takes five Int32-compatible arguments; however, the compiler sees that the source code has a call to Add that is being passed a list of Int32 values and that there is an Add method whose array-of-Int32 parameter is marked with the ParamArray attribute . So the compiler considers this a match and generates code that coerces the parameters into an Int32 array and then calls the Add method . The end result is that you can write the code, easily passing a bunch of parameters to Add, but the compiler generates code as though you d written the first version that explicitly constructs and initializes the array . Only the last parameter to a method can be marked with the params keyword (ParamArrayAttribute) . This parameter must also identify a single-dimension array of any type . It s legal to pass null or a reference to an array of 0 entries as the last parameter to the method . The following call to Add compiles fine, runs fine, and produces a resulting sum of 0 (as expected):

Within the Proseware network, a DNS client computer with the IP address 192.168.33.5 submits a query to a DNS server for the name intranet.proseware.com. Assuming that the Netmask Ordering option is enabled on the DNS server, which IP address is returned to the DNS client (Hint: Determine which of the four Web serv ers shares the same subnet ID as that of the querying client computer.)

public static void Main() { // Both of these lines display "0" Console.WriteLine(Add()); // passes new Int32[0] to Add Console.WriteLine(Add(null)); // passes null to Add: more efficient (no array allocated) }

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Like Java, .NET makes it difficult to subclass concrete collection classes to provide specialized behavior without implementing large amounts of functionality. There always seems to be some vital method or inner class that is not accessible. Both languages provide abstract classes as the mechanism for custom designs, but we think that the .NET classes are better thought out. The abstract classes in .NET are listed in Table 9-7.

So far, all of the examples have shown how to write a method that takes an arbitrary number of Int32 parameters . How would you write a method that takes an arbitrary number of parameters where the parameters could be any type The answer is very simple: just modify the method s prototype so that it takes an Object[] instead of an Int32[] . Here s a method that displays the Type of every object passed to it:

The Advanced tab of the DNS server properties dialog box allows you to configure nine installation settings. The Disable Recursion server option is disabled by default, so recursion is enabled for the DNS server, and the server performs queries for its clients unless a special client configuration overrides this behavior. The BIND Secondaries option is enabled by default. Thus, DNS servers in Win dows Server 2003 do not use fast transfer format when performing a zone transfer to BIND-based DNS servers. This feature allows for zone transfer compatibility with older versions of BIND. The Enable Netmask Ordering option is selected by default. As a result, in response to a request to resolve the name of a multihomed computer (a computer with more than one IP address), DNS servers in Windows Server 2003 by default first return to the client any IP address that is in the same subnet as the client s. The Enable Round Robin option is selected by default. Thus, in response to a request to resolve a name hosted at multiple addresses, and in cases where subnet prioritization does not apply, DNS servers in Windows Server 2003 by default rotate the order of matching A resource records in the response list returned to dif ferent clients.

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public sealed class Program { public static void Main() { DisplayTypes(new Object(), new Random(), "Jeff", 5); } private static void DisplayTypes(params Object[] objects) { if (objects != null) { foreach (Object o in objects) Console.WriteLine(o.GetType()); } } }

Class Description Provides a basis for strongly typed collections. CollectionBase ReadOnlyCollectionBase Provides a basis for strongly typed collections that don't permit elements to be modified. Provides a basis for strongly typed collections of key/value pairs. DictionaryBase The most interesting aspect of these classes is that none of the collections detailed in this chapter are derived from them. There is no specific reason why custom collections have to be subclassed from one of these bases, but it is generally good practice to do so.

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Running this code yields the following output:

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