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// Get ref to interface
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ifc.PrintOut ("interface"); // Use ref to interface to call member Use dot-syntax notation to call through the interface reference. For example, the following code declares an interface and a class that implements it. The code in Main creates an object of the class, and calls the implementation method through the class object. It also creates a variable of the interface type, casts the reference of the class object to the interface type, and calls the implementation method through the reference to the interface.
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CHAPTER 17 INTERFACES
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interface IIfc1 { void PrintOut(string s); } class MyClass: IIfc1 { public void PrintOut(string s) { Console.WriteLine("Calling through: } } class Program { static void Main() { MyClass mc = new MyClass(); mc.PrintOut("object."); IIfc1 ifc = (IIfc1)mc; ifc.PrintOut("interface."); } } Figure 17-3 illustrates the class and the reference to the interface.
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{0}", s);
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// Create class object // Call class object implementation method // Cast class object ref to interface ref // Call interface method
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Figure 17-3. A reference to the class object and a reference to the interface
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CHAPTER 17 INTERFACES
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Implementing Multiple Interfaces
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In the examples shown so far, the classes have implemented a single interface. A class or struct can implement any number of interfaces. All the interfaces implemented must be listed in the base class list and separated by commas (following the base class name, if there is one). For example, the following code shows class MyData, which implements two interfaces: IDataRetrieve and IDataStore. Figure 17-4 illustrates the implementation of the multiple interfaces in the class shown in the preceding code. interface IDataRetrieve { int GetData(); } interface IDataStore { void SetData( int x ); } Interface Interface class MyData: IDataRetrieve, IDataStore { int mem1; public int GetData() { return mem1; } public void SetData( int x ){ mem1 = x; } } class Program { static void Main() { MyData data = new MyData(); data.SetData( 5 ); Console.WriteLine("Value = {0}", data.GetData()); } } // Declare interface // Declare interface
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// Declare class // Declare field
// Main
Figure 17-4. Class implementing multiple interfaces
CHAPTER 17 INTERFACES
Implementing Interfaces with Duplicate Members
Since a class can implement any number of interfaces, it is possible that two or more of the interface members might have the same signature and return type. How does the compiler handle that situation For example, suppose you had two interfaces IIfc1 and IIfc2 as shown following. Each interface has a method named PrintOut, with the same signature and return type. If you were to create a class that implemented both interfaces, how should you handle these duplicate interface methods interface IIfc1 { void PrintOut(string s); } interface IIfc2 { void PrintOut(string t); } The answer is that if a class implements multiple interfaces, where several of the interfaces have members with the same signature and return type, the class can implement a single member that satisfies all the interfaces containing that duplicated member. For example, the following code shows the declaration of class MyClass, which implements both IIfc1 and IIfc2. Its implementation of method PrintOut satisfies the requirement for both interfaces. class MyClass : IIfc1, IIfc2 { public void PrintOut(string s) { Console.WriteLine("Calling through: } } class Program { static void Main() { MyClass mc = new MyClass(); mc.PrintOut("object."); } } // Implement both interfaces // Single implementation for both {0}", s);
CHAPTER 17 INTERFACES
This code produces the following output:
Calling through:
object.
Figure 17-5 illustrates the duplicate interface methods being implemented by a single class-level method implementation.
Figure 17-5. Multiple interfaces implemented by the same class member
References to Multiple Interfaces
You saw previously that interfaces are reference types, and that you can get a reference to an interface by casting an object reference to the interface type. If a class implements multiple interfaces, you can get separate references for each one. For example, the following class implements two interfaces with the single method PrintOut. The code in Main calls method PrintOut in three ways: Through the class object Through a reference to the IIfc1 interface Through a reference to the IIfc2 interface
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