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the constructors simply execute the base class constructor Because NotFoundException adds nothing to Exception, there is no need for any further actions */ public NotFoundException() : base() { } public NotFoundException(string str) : base(str) { } public NotFoundException(string str, Exception inner) : base(str, inner) { } protected NotFoundException( SystemRuntimeSerializationSerializationInfo si, SystemRuntimeSerializationStreamingContext sc) : base(si, sc) { } } // An interface that supports a name and phone number public interface IPhoneNumber { string Number { get; set; } string Name { get; set; } } // A class of phone numbers for friends // It implements IPhoneNumber class Friend : IPhoneNumber { public Friend(string n, string num, bool wk) { Name = n; Number = num; IsWorkNumber = wk; } public bool IsWorkNumber { get; private set; } // Implement IPhoneNumber public string Number { get; set; } public string Name { get; set; } // } // A class of phone numbers for suppliers class Supplier : IPhoneNumber { public Supplier(string n, string num) { Name = n; Number = num; }
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PART I PART I PART I
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// Implement IPhoneNumber public string Number { get; set; } public string Name { get; set; } // } // Notice that this class does not implement IPhoneNumber class EmailFriend { // } // PhoneList can manage any type of phone list // as long as it implements IPhoneNumber class PhoneList<T> where T : IPhoneNumber { T[] phList; int end; public PhoneList() { phList = new T[10]; end = 0; } public bool Add(T newEntry) { if(end == 10) return false; phList[end] = newEntry; end++; return true; } // Given a name, find and return the phone info public T FindByName(string name) { for(int i=0; i<end; i++) { // Name can be used because it is a member of // IPhoneNumber, which is the interface constraint if(phList[i]Name == name) return phList[i]; } // Name not in list throw new NotFoundException(); } // Given a number, find and return the phone info public T FindByNumber(string number) { for(int i=0; i<end; i++) { // Number can be used because it is also a member of // IPhoneNumber, which is the interface constraint if(phList[i]Number == number) return phList[i]; }
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// Number not in list throw new NotFoundException(); }
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PART I PART I PART I
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// } // Demonstrate interface constraints class UseInterfaceConstraint { static void Main() { // The following code is OK because Friend // implements IPhoneNumber PhoneList<Friend> plist = new PhoneList<Friend>(); plistAdd(new Friend("Tom", "555-1234", true)); plistAdd(new Friend("Gary", "555-6756", true)); plistAdd(new Friend("Matt", "555-9254", false)); try { // Find the number of a friend given a name Friend frnd = plistFindByName("Gary"); ConsoleWrite(frndName + ": " + frndNumber); if(frndIsWorkNumber) ConsoleWriteLine(" (work)"); else ConsoleWriteLine(); } catch(NotFoundException) { ConsoleWriteLine("Not Found"); } ConsoleWriteLine(); // The following code is also OK because Supplier // implements IPhoneNumber PhoneList<Supplier> plist2 = new PhoneList<Supplier>(); plist2Add(new Supplier("Global Hardware", "555-8834")); plist2Add(new Supplier("Computer Warehouse", "555-9256")); plist2Add(new Supplier("NetworkCity", "555-2564")); try { // Find the name of a supplier given a number Supplier sp = plist2FindByNumber("555-2564"); ConsoleWriteLine(spName + ": " + spNumber); } catch(NotFoundException) { ConsoleWriteLine("Not Found"); } // The following declaration is invalid because EmailFriend // does NOT implement IPhoneNumber PhoneList<EmailFriend> plist3 = new PhoneList<EmailFriend>(); // Error!
// // } }
Part I:
The C# Language
In this version of the program, the interface constraint specified by PhoneList requires that a type argument implement the IPhoneList interface Because both Friend and Supplier implement IPhoneList, they are valid types to be bound to T However, EmailFriend does not implement IPhoneList and cannot be bound to T To prove this, remove the comment symbols from the last two lines in Main( ) As you will see, the program will not compile
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