Part III in Visual Studio .NET

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Part III
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Creating Components
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De ning an Enumerator for the Tree<TItem> Class by Using an Iterator
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In the next exercise, you will implement the enumerator for the Tree<TItem> class by using an iterator. Unlike the preceding set of exercises, which required the data in the tree to be preprocessed into a queue by the MoveNext method, you can de ne an iterator that traverses the tree by using the more natural recursive mechanism, similar to the WalkTree method discussed in 18.
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Add an enumerator to the Tree<TItem> class
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1. Using Visual Studio 2008, open the BinaryTree solution located in the \Microsoft Press \Visual CSharp Step by Step\ 19\IterarorBinaryTree folder in your Documents folder. This solution contains another copy of the BinaryTree project you created in 18. 2. Display the le Tree.cs in the Code and Text Editor window. Modify the de nition of the Tree<TItem> class so that it implements the IEnumerable<TItem> interface, as shown in bold type here:
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public class Tree<TItem> : IEnumerable<TItem> where TItem : IComparable<TItem> { ... }
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3. Right-click the IEnumerable<TItem> interface in the class de nition, point to Implement Interface, and then click Implement Interface Explicitly. The IEnumerable<TItem>.GetEnumerator and IEnumerable.GetEnumerator methods are added to the class. 4. Locate the generic IEnumerable<TItem>.GetEnumerator method. Replace the contents of the GetEnumerator method as shown in bold type in the following code:
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IEnumerator<TItem> IEnumerable<TItem>.GetEnumerator() { if (this.LeftTree != null) { foreach (TItem item in this.LeftTree) { yield return item; } } yield return this.NodeData;
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19
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if (this.RightTree != null) { foreach (TItem item in this.RightTree) { yield return item; } } }
Enumerating Collections
It might not look like it at rst glance, but this code follows the same recursive algorithm that you used in 18 for printing the contents of a binary tree. If the LeftTree is not empty, the rst foreach statement implicitly calls the GetEnumerator method (which you are currently de ning) over it. This process continues until a node is found that has no left subtree. At this point, the value in the NodeData property is yielded, and the right subtree is examined in the same way. When the right subtree is exhausted, the process unwinds to the parent node, outputting the parent s NodeData property and examining the right subtree of the parent. This course of action continues until the entire tree has been enumerated and all the nodes have been output.
Test the new enumerator
1. In Solution Explorer, right-click the BinaryTree solution, point to Add, and then click Existing Project. In the Add Existing Project dialog box, move to the folder \Microsoft Press\Visual CSharp Step By Step\ 19\EnumeratorTest, select the EnumeratorTest project le, and then click Open. This is the project that you created to test the enumerator you developed manually earlier in this chapter. 2. Right-click the EnumeratorTest project in Solution Explorer, and then click Set as Startup Project. 3. Expand the References node for the EnumeratorTest project in Solution Explorer. Right-click the BinaryTree assembly, and then click Remove. This action removes the reference to the old BinaryTree assembly (from 18) from the project. 4. On the Project menu, click Add Reference. In the Add Reference dialog box, click the Projects tab. Select the BinaryTree project, and then click OK. The new BinaryTree assembly appears in the list of references for the EnumeratorTest project in Solution Explorer. Note These two steps ensure that the EnumeratorTest project references the version of the BinaryTree assembly that uses the iterator to create its enumerator rather than the earlier version.
Part III
Creating Components
5. Display the Program.cs le for the EnumeratorTest project in the Code and Text Editor window. Review the Main method in the Program.cs le. Recall from testing the earlier enumerator that this method instantiates a Tree<int> object, lls it with some data, and then uses a foreach statement to display its contents. 6. Build the solution, correcting any errors if necessary. 7. On the Debug menu, click Start Without Debugging. The program runs and displays the values in the same sequence as before: 12, 8, 0, 5, 5, 10, 10, 11, 14, 15 8. Press Enter and return to Visual Studio 2008. If you want to continue to the next chapter Keep Visual Studio 2008 running, and turn to 20. If you want to exit Visual Studio 2008 now On the File menu, click Exit. If you see a Save dialog box, click Yes (if you are using Visual Studio 2008) or Save (if you are using Microsoft Visual C# 2008 Express Edition) and save the project.
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