实施 INotifyPropertyChanged 时，[CallerMemberName] 与替代方案相比是否慢？

有好文章推荐不同的实施方式INotifyPropertyChanged http://blog.amusedia.com/2013/06/inotifypropertychanged-implementation.html.

考虑以下基本实现：

class BasicClass : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private void FirePropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
            handler(this, new PropertyChangedEventArgs(propertyName));
    }

    private int sampleIntField;

    public int SampleIntProperty
    {
        get { return sampleIntField; }
        set
        {
            if (value != sampleIntField)
            {
                sampleIntField = value;
                FirePropertyChanged("SampleIntProperty"); // ouch ! magic string here
            }
        }
    }
}

我想用这个替换它：

using System.Runtime.CompilerServices;

class BetterClass : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    // Check the attribute in the following line :
    private void FirePropertyChanged([CallerMemberName] string propertyName = null)
    {
        var handler = PropertyChanged;
        if (handler != null)
            handler(this, new PropertyChangedEventArgs(propertyName));
    }

    private int sampleIntField;

    public int SampleIntProperty
    {
        get { return sampleIntField; }
        set
        {
            if (value != sampleIntField)
            {
                sampleIntField = value;
                // no "magic string" in the following line :
                FirePropertyChanged();
            }
        }
    }
}

但有时我读到[CallerMemberName]与替代属性相比，该属性的性能较差。这是真的吗？为什么？它使用反射吗？

No, 指某东西的用途[CallerMemberName]并不慢比上层基本实现。

这是因为，根据这个 MSDN 页面 https://msdn.microsoft.com/en-us/library/hh534540(v=vs.110).aspx,

调用者信息值作为文字发送到中间 编译时的语言 (IL)

We can check that with any IL disassembler (like ILSpy http://ilspy.net/) : the code for the "SET" operation of the property is compiled exactly the same way :

所以这里没有使用Reflection。

（使用VS2013编译的示例）