CODEWITHSUNDEEP
c#interfacetypes
jojo
jojo

Reputation: 13843

Type of object question

In C#, i have an interface, and there are some class will implement this interface. i have a generic utility class, which i want to limit so that the utility class can only be declared using types implementing that interface, as show below, how can i do it??

public interface IMyInterface 
{}

public class A : IMyInterface {} // can pass into UtilityClass
public interface B : IMyInterface{}
public class C : B {} // can pass into UtilityClass
public class D {} // can Not pass into UtilityClass

public class UtilityClass<T is IMyInterface>
{
// some utility function
}

Thanks.

Upvotes: 0

Views: 98

Answers (4)

Lugoues
Lugoues

Reputation: 424

public class UtilityClass<T> where T: IMyInterface
{
// some utility function
}

They are called constraints, you can read more here http://msdn.microsoft.com/en-us/library/d5x73970.aspx

Upvotes: 1

lomaxx
lomaxx

Reputation: 115763

You can add restrictions to generic classes like so:

public class UtilityClass<T> where T : IMyInterface
{
// some utility function
}

Upvotes: 0

Scott M.
Scott M.

Reputation: 7347

use the where clause:

public interface IMyInterface 
{}


public class UtilityClass<T> where T : IMyInterface
{
// some utility function
}

Upvotes: 0

Adam Robinson
Adam Robinson

Reputation: 185593

You're looking for a generic constraint. These are expressed in C# by using the where keyword after the class name.

public class UtilityClass<T> where T:IMyInterface
{

}

Upvotes: 6

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