c# interface

public interface IA
{
void Member(string str);
}
public interface IB
{
void Member(string str);
}
public class TestInterface:IA,IB
{
public void Member(string str)
     {
//to do....
     }
}
//new override base interface member.....
interface IA
{
void Member();
}
interface IB:IA
{
new void Member();
}
//1:分別顯式實現
public class TestInterface:IB
{
void IA.Member()
    {
//to do....
    }
void IB.Member()
    {
//to do...
    }
}
//2:隱式實現A.Member()
public class TestInterface:IB
{
void Member()
    {
//to do....
    }
void IB.Member()
    {
//to do...
    }
}
//3:隱式實現B.Member()
public class TestInterface:IB
{
void IA.Member()
    {
//to do....
    }
void Member()
    {
//to do...
    }
}