question about c# interface

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I have a code sample I don't understand:

C#

class LinkedList<T> : IEnumerable<T>
{
    public IEnumerator<T> GetEnumerator()
    {
    }

    IEnumerator IEnumerable.GetEnumerator()
    {

    }
}

1. IEnumerable.GetEnumerator(), what's the usage put the interface in front of the method name?

2. why IEnumerable.GetEnumerator() cannot have a modifier, if I change this to :
public IEnumerator IEnumerable.GetEnumerator(), the compiler says : "The modifier 'public' is not valid for this item"

Posted 29-Jul-14 7:23am

JohnsonYuan

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2 solutions

Solution 1

An interface is put infront of the name to tell the compiler that this class should implement methods in that interface.
Interfaces in C# (For Beginners)[^]

An interface is a contract to the outside world and its members do not have access modifiers.

Posted 29-Jul-14 7:44am

Abhinav S

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arpoador · Accepted Answer · 2014-07-29T11:12:00

"1."
The interface's name in front of the interface's method name, tells the compiler it's an explicit method implementation. Thus, this method can only be called from an instance of this interface.

"2."
This kind of declaration, already defines who can call the method, i.e., any variable that's a reference to this specific interface, for an object of that implements that interface.