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The interface constraint enables you to specify an interface that a type argument must implement The interface constraint serves the same two important purposes as the base class constraint First, it lets you use the members of the interface within the generic class Second, it ensures that only type arguments that implement the specified interface are used This means that for any given interface constraint, the type argument must be either the interface or a type that implements that interface The interface constraint uses this form of the where clause: where T : interface-name Here, T is the name of the type parameter, and interface-name is the name of the interface More than one interface can be specified by using a comma-separated list If a constraint includes both a base class and interface, then the base class must be listed first The following program illustrates the interface constraint by reworking the telephone list example shown in the previous section In this version, the PhoneNumber class has been converted into an interface called IPhoneNumber This interface is then implemented by Friend and Supplier

// Use an interface constraint using System; // A custom exception that is thrown if a name or number is not found class NotFoundException : Exception { /* Implement all of the Exception constructors Notice that

18:

1 Calculate, if possible, each of these limits Give reasons for each step of your solution (a) lim x e x

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 message) : base(message) { } public NotFoundException(string message, Exception innerException) : base(message, innerException) { } protected NotFoundException( SystemRuntimeSerializationSerializationInfo info, SystemRuntimeSerializationStreamingContext context) : base(info, context) { } } // 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; }

Part I:

// 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]; }

(c) lim (x 4) cot(x 4)

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The same content presented in a much stronger way shifts the focus from the company to the company s customers Consider this alternative:

// Number not in list throw new NotFoundException(); }