命名参数可以使你的代码更清晰

考虑这个简单的类:

class SmsUtil
{
    public bool SendMessage(string from, string to, string message, int retryCount, object attachment)
    {
         // Some code
    }
}

在 C#3.0 之前,它是:

var result = SmsUtil.SendMessage("Mehran", "Maryam", "Hello there!", 12, null);

你可以使用命名参数使此方法调用更加清晰 :

var result = SmsUtil.SendMessage(
    from: "Mehran",
    to:  "Maryam",
    message "Hello there!",
    retryCount: 12,
    attachment: null);