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) This consists of encapsulating the cleanup code for these resources in a void, parameterless method, which you should call Dispose When you re done with the resources and want them released, you need to call Dispose Notice that it is you who needs to call Dispose not the destructor The system will not call it for you automatically Some guidelines for your Dispose method are the following: Implement the code in Dispose in such a way that it is safe for the method to be called more than once If it has already been called, then on any subsequent invocations it should not raise an exception or do any additional work (Exceptions are covered in 11) Write your Dispose method and destructor such that, if for some reason your code doesn t get to call Dispose, your destructor will call it and release the resources.

Notify an object when something interesting happens. Use a single delegate to invoke multiple methods. Create delegated methods based on parameter values. Discover the methods that will be called by a delegate.

namespace CloudTableStorageService_WebRole.CloudTableStorageDataContext { using Microsoft.Samples.ServiceHosting.StorageClient; using CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; abstract public class TableContext : TableStorageDataServiceContext, ITableContext { public string TableName { get; set; } public TableContext(StorageAccountInfo accountInfo) : base(accountInfo) { } abstract public ICloudEntity QueryEntitiesByPartionKey(string partitionKey); abstract public ICloudEntity QueryEntitiesByRowKey(string rowKey); } } The class CloudTableServiceFactory is a utility class that implements the factory method design pattern using.NET Reflection to dynamically instantiate the concrete cloud table entity subclasses. The implementation of this class is shown in Listing 2-20. Listing 2-20. The Class CloudTableServiceFactory Implements the Factory Method Design Pattern Used to Dynamically Create a Concrete Cloud Table Class using using using using using System; System.Collections.Generic; System.Linq; System.Web; System.Reflection;

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Since Dispose is doing the cleanup rather than the destructor, it should call the GCSuppressFinalize method, which tells the CLR not to call this object s destructor, because it has already been taken care of The following code describes the safe disposal process First, the class needs to declare a Boolean disposed field to keep track of whether the cleanup has occurred or not This is initialized to false when the object is created Inside the Dispose method, do the following: Check the flag to see whether the resources have already been released If not, then do the following: Call the Dispose methods on any managed resources that require it Release any unmanaged resources held by the object Now that the disposal has occurred, set the disposed flag to true.

Since jagged arrays are arrays of arrays, you must use separate foreach statements for each dimension in the jagged array. The foreach statements must be nested properly to make sure that each nested array is processed properly. For example, in the following code, the first foreach statement cycles through the top-level array arr1 selecting the next sub-array to process. The inner foreach statement processes the elements of that sub-array. class Program { static void Main( ) { int total = 0; int[][] arr1 = new int[2][]; arr1[0] = new int[] { 10, 11 }; arr1[1] = new int[] { 12, 13, 14 }; foreach (int[] array in arr1) // Process the top level. { Console.WriteLine("Starting new array"); foreach (int item in array) // Process the second level. { total += item; Console.WriteLine(" Item: {0}, Current Total: {1}", item, total); } } } } This code produces the following output: Starting new array Item: 10, Current Item: 11, Current Starting new array Item: 12, Current Item: 13, Current Item: 14, Current

Finally, call the garbage collector s SuppressFinalize method to tell the garbage collector not to call the class s destructor..

You can apply different constraints to each parameterized type when a generic class defines more than one. Listing 15-14 contains an example. Listing 15-14. Constraining More Than One Parameterized Type using System; class KeyStack<TKey, TKey[] keysArray TVal[] valsArray int currentPos = TVal> where TKey : class, IComparable<TKey> where TVal : struct { = new TKey[5]; = new TVal[5]; 0;

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