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[C#] Explicit interfaces
Posted by Matthijs on Mar 07 2006 @ 23:14 :: 5511 unique visits
When using C# it could be that you would like to implement two or more interfaces with the same method, but that you would still like to implement both of them (and make them do different stuff).This is really simple to do:
CODE: CSHARP
interface IA
{
void DoSomething();
}
interface IB
{
void DoSomething();
}
class TestClass : IA, IB
{
//Explicitly implement the DoSomething for the IA interface
void IA.DoSomething()
{
Console.WriteLine("IA");
}
void DoSomething()
{
Console.WriteLine("The rest"); //Kinda like the "default"
}
}
{
void DoSomething();
}
interface IB
{
void DoSomething();
}
class TestClass : IA, IB
{
//Explicitly implement the DoSomething for the IA interface
void IA.DoSomething()
{
Console.WriteLine("IA");
}
void DoSomething()
{
Console.WriteLine("The rest"); //Kinda like the "default"
}
}
This way, depending on the type, the appropriate function will be called!
CODE: CSHARP
TestClass tc = new TestClass();
tc.DoSomething(); //This wil print "The rest"
(tc as IA).DoSomething(); // Output: "IA"
(tc as IB).DoSomething(); // Output: "The rest"
tc.DoSomething(); //This wil print "The rest"
(tc as IA).DoSomething(); // Output: "IA"
(tc as IB).DoSomething(); // Output: "The rest"
Just a small tip that could come in handy!
10 comments posted so far
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2. On Mar 09 2006 @ 00:04 guest wrote:
for crying out LOUD.If you wanted C++, you should have sticked to it...
3. On Mar 09 2006 @ 09:00 Matthijs wrote:
lol :)4. On Mar 09 2006 @ 23:57 Gauthier wrote:
#post: This is the base of interfaces, strong typing and clear design with C#, but I'm "amazed" how much people don't know this particular feature (explicit interface implementation).What I wonder is (about the previous c# post) var keyword will allow:
var member = new SpecificMember() as IMember;
#1: I gave a quick & dirty introduction on interfaces and .net (and their origins) to my collaborators, and this was the main study case (how to use interfaces and weighting the pros & cons enforcement of interface typed variables to access the interface members).
Is it in your habits (in your daily job) to implement interfaces like that? when I showcased the "feature" much people has fears and was frowned? they asked about productivity (even some corps use vb.net with strict off...!!).
I think it's a good way to initiate the use of interfaces (enforce to declare variables with interface instead of concrete type...) and to enhance the design/readability of the code.
#2: I'm currently studing other languages than c#; could you explain me how you define interfaces in c++ (I thought it was only possible via the use of abstract classes but I'm still a newbie in c++)?
Thanks
5. On Mar 16 2006 @ 21:45 l0ne wrote:
Gauthier: yes, it will be allowed. As the resulting type of the expression is IMember, the compiler will expand it as:IMember member = new SpecificMember() as IMember;
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1. On Mar 07 2006 @ 23:30 Niek wrote:
This is also handy if you'd like to force others to call methods on the interface, instead of calling them on the derived class.