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1. Open Link.cs and add a reference to the RegularExpressions namespace: using System.Text.RegularExpressions; 2. Add two static members to the Link class, named purifyUrlRegex and dashesRegex: public class Link { // regular expression that removes characters that aren't a-z, 0-9, dash, // underscore or space private static Regex purifyUrlRegex = new Regex("[^-a-zA-Z0-9_ ]", RegexOptions.Compiled); // regular expression that changes dashes, underscores and spaces to dashes private static Regex dashesRegex = new Regex("[-_ ]+", RegexOptions.Compiled); 3. Add the following method to the Link class. This method transforms a department, category or product name, such as Balloons for Children, to a URL-friendly string that can be used to build BalloonShop URLs, such as Balloons-for-Children. // prepares a string to be included in an URL private static string PrepareUrlText(string urlText) { // remove all characters that aren't a-z, 0-9, dash, underscore or space urlText = purifyUrlRegex.Replace(urlText, ""); // remove all leading and trailing spaces urlText = urlText.Trim(); // change all dashes, underscores and spaces to dashes urlText = dashesRegex.Replace(urlText, "-"); // return the modified string return urlText; } 4. Modify the ToDepartment method in Link like this: public static string ToDepartment(string departmentId, string page) { // prepare department URL name DepartmentDetails d = CatalogAccess.GetDepartmentDetails(departmentId); string deptUrlName = PrepareUrlText(d.Name);

Once the GetHashCode() method has been implemented, the Equals() method can be implemented: public override bool Equals(object obj) { if (obj is HashCodeExample) { return obj.GetHashCode() == this.GetHashCode(); } else { return false; } } Because the rule for GetHashCode() is that two object instances with identical hashcode values must return the same value, it makes sense to implement Equals() using GetHashCode(). However, what started out as a good idea turns out to be a bad idea, as the following illustrates: String s1 = "Hello"; String s2 = "World";

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// build department URL if (page == "1") return BuildAbsolute(String.Format("{0}-d{1}/", deptUrlName, departmentId)); else return BuildAbsolute(String.Format("{0}-d{1}/Page={2}", deptUrlName, departmentId, page)); } 5. Modify the ToCategory method in Link like this: public static string ToCategory(string departmentId, string categoryId, string page) { // prepare department and category URL names DepartmentDetails d = CatalogAccess.GetDepartmentDetails(departmentId); string deptUrlName = PrepareUrlText(d.Name); CategoryDetails c = CatalogAccess.GetCategoryDetails(categoryId); string catUrlName = PrepareUrlText(c.Name); // build category URL if (page == "1") return BuildAbsolute(String.Format("{0}-d{1}/{2}-c{3}/", deptUrlName, departmentId, catUrlName, categoryId)); else return BuildAbsolute(String.Format("{0}-d{1}/{2}-c{3}/Page-{4}/", deptUrlName, departmentId, catUrlName, categoryId, page)); } Modify the ToProduct method in Link like this: public static string { // prepare product ProductDetails p = string prodUrlName ToProduct(string productId) URL name CatalogAccess.GetProductDetails(productId.ToString()); = PrepareUrlText(p.Name);

int x1 = 17 * 17 + s1GetHashCode(); int x2 = 17 * 17 + s2GetHashCode(); HashCodeExample h1 = new HashCodeExample (x2 * 37, s1); HashCodeExample h2 = new HashCodeExample (x1 * 37, s2); Hashtable ht = new Hashtable(); htAdd(h1, null); htAdd(h2, null); This shows that having two objects with completely different states results in the same hashcode value and generates an exception because Equals() has been implemented incorrectly In the implementation of Hashtable, when an added object collides with another already existing object, an equality test is made If the equality test returns true, then the exception is generated because Hashtable does not allow you to add an object with the same state as another object The solution is not to fix the GetHashCode() method, but rather to modify the Equals() method: public override bool Equals(object obj) { if (obj is HashCodeExampleWorking) { if (obj.

// build product URL return BuildAbsolute(String.Format("{0}-p{1}/", prodUrlName, productId)); } 6. Load BalloonShop, and notice the new links. In Figure 7-4, the URL of the Love & Romance category, http://www.example.com/Anniversary-Balloons-d1/Love-Romance-c1/, is visible in Internet Explorer s status bar. Figure 7-5 shows the new URL of the I Love You (Simon Elvin) product.

In this exercise, you modified the ToDepartment, ToCategory, and ToProduct methods of the Link class to build keyword-rich URLs instead of dynamic URLs. The heart of the changes lies in using regular expressions in the PrepareUrlText method, which receives as a parameter a string, such as a product or category name, and transforms

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