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C# Equivalent to Java Functional Interfaces

The closest C# equivalent to Java's functional interfaces are C# delegates.

Java C#
@FunctionalInterface
public interface FooFunctional
{
    void invoke();
}

public class UseFunctionalInterface
{
    void method()
    {
        FooFunctional funcVar = () -> voidMethod();
        funcVar.invoke();
    }
    void voidMethod()
    {
    }
}
public delegate void FooFunctional();

public class UseFunctionalInterface
{
    internal virtual void method()
    {
        FooFunctional funcVar = () => voidMethod();
        funcVar();
    }
    internal virtual void voidMethod()
    {
    }
}


Use Java to C# Converter to convert from Java to C#.     

Additional resource: Java and C# Equivalents


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