c# - 与 IEnumerable 实现相关的显式接口(interface)实现？

Question

为什么在 this MSDN 示例是否需要 GetEnumerator1 方法？

// Must implement GetEnumerator, which returns a new StreamReaderEnumerator. 
public IEnumerator<string> GetEnumerator()
{
    return new StreamReaderEnumerator(_filePath);
}

// Must also implement IEnumerable.GetEnumerator, but implement as a private method. 
private IEnumerator GetEnumerator1()
{
    return this.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
    return GetEnumerator1();
}

Answer 1

不需要，我们可以用

// Must implement GetEnumerator, which returns a new StreamReaderEnumerator. 

public IEnumerator<string> GetEnumerator()
{
    return new StreamReaderEnumerator(_filePath);
}

// Must also implement IEnumerable.GetEnumerator, but implement as a private method. 

IEnumerator IEnumerable.GetEnumerator()
{
    return GetEnumerator();
}

相反。