explicit interface implementation

Question

hi , i want to know which if1 and if2 and w property has been implemennted.how do we know whether its of I or of J? the code is showing no compilation error.

Vulpes · Answer

If a class C implements two interfaces, if1 and if2, each of which have a property w with the same signature, then C.w is considered to implement both if1.w and if2.w as the following example makes clear: using System; interface if1 { int w {get; set;} } interface if2 { int w {get; set;} } class C : if1, if2 { public int w {get; set;} } class Test { static void Main() { C c = new C(); if1 I = c; I.w = 3; Console.WriteLine(c.w); // 3 if2 J = c; J.w = 4; Console.WriteLine(c.w); // 4 Console.ReadKey(); } } Even though we've set w using interface references, we can still access it in both cases through a C reference. However, if you want each interface to have separate implementations of w within C, then you need to use explicit interface implementation. Each implementation of w can then only be accessed via an interface reference of the appropriate type, as the following revised example shows: using System; interface if1 { int w {get; set;} } interface if2 { int w {get; set;} } class C : if1, if2 { int if1.w {get; set;} int if2.w {get; set;} } class Test { static void Main() { C c = new C(); if1 I = c; I.w = 3; Console.WriteLine(I.w); // 3 if2 J = c; J.w = 4; Console.WriteLine(J.w); // 4 Console.ReadKey(); } } If you tried to use c.W, instead of I.w or J.w, then you'd get a compiler error.

nishant kumar · Answer

thanks for the help vulpes.