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using System; using SystemCollectionsGeneric; class Program { static void Main() { Dictionary<Guid,string> dictionary = newDictionary<Guid, string>(); Guid key = GuidNewGuid(); dictionaryAdd(key, "object"); } }

public static void CopyTo(

Listing 124 inserts the string "object" using a Guid as its key If an element with the same key has already been added, an exception is thrown An alternative is to use the indexer, as shown in Listing 125

this DirectoryInfo sourceDirectory, string target, SearchOption option, string searchPattern) { // } }

// DirectoryInfo directory = new DirectoryInfo("\\Source"); directoryCopyTo("\\Target", SearchOptionAllDirectories, "*"); //

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using System; using SystemCollectionsGeneric; class Program { static void Main() { Dictionary<Guid, string> dictionary = newDictionary<Guid, string>(); Guid key = GuidNewGuid(); dictionary[key] = "object"; dictionary[key] = "byte"; } }

Via this simple addition to C# 30, it is now possible to add instance methods to any class, even classes that are not within the same assembly The resultant CIL code, however, is identical to what the compiler creates when calling the extension method as a normal static method Extension method requirements are as follows

To designate the extension method, prefix the extended type with the this modifier To access the method as an extension method, import the extending

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The first thing to observe in Listing 125 is that the index operator does not require an integer Instead, the index data type is specified by the first type parameter, TKey, when declaring a Dictionary<TKey, TValue> variable (in the case of Hashtable, the data type is object) In this example, the key data type used is Guid, and the value data type is string The second thing to notice in Listing 125 is the reuse of the same index In the first assignment, no dictionary element corresponds to key Instead of throwing an out-of-bounds exception, as an array would, dictionary collection classes insert a new object During the second assignment, an element with the specified key already exists, so instead of inserting an additional element, the existing element corresponding to key is updated from "object" to "byte" Accessing a value from a dictionary using the index operator ([]) with a nonexistent key throws an

Figure 39 The correct version of the inheritance hierarchy showing the correct position of SalesEmployee

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type s namespace via a using directive (or place the extending class in the same namespace as the calling code) If the extension method signature matches a signature on the extended type already (that is, if CopyTo() already existed on DirectoryInfo), the extension method will never be called except as a normal static method

exception of type SystemCollectionsGenericKeyNotFoundException The ContainsKey() method, however, allows you to check whether a particular key is used before accessing its value, thereby avoiding the exception Also, since the keys are stored in a hash algorithm type structure, the search is relatively efficient By contrast, checking whether there is a particular value in the dictionary collections is a time-consuming operation with linear performance characteristics To do this you use the ContainsValue() method, which searches sequentially through each element in the collection You remove a dictionary element using the Remove() method, passing the key, not the element value There is no particular order for the dictionary classes Elements are arranged into a hashtable type data structure using hashcodes for rapid retrieval (acquired by calling GetHashCode() on the key) Iterating through a dictionary class using the foreach loop, therefore, accesses values in no particular order Because both the key and the element value are required to add an element to the dictionary, the data type returned from the foreach loop is KeyValuePair<TKey, TValue> for Dictionary<TKey, TValue>, and DictionaryEntry for Hashtable Listing 126 shows a snippet of code demonstrating the foreach loop with the Dictionary<TKey, TValue> collection class The output appears in Output 123

Note that specializing a type via inheritance (which I will cover in 6) is preferable to using an extension method Extension methods do not provide a clean versioning mechanism since the addition of a matching signature to the extended type will take precedence over the extension method without warning of the change The subtlety of this is more pronounced for extended classes whose source code you don t control Another minor point is that, although development IDEs support IntelliSense for extension methods, it is not obvious that a method is an extension method by simply reading through the calling code In general, use extension methods sparingly

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