C Advanced Programming - features

characteristic

1. Definition of custom attribute class
When defining a custom attribute class, the class name suffix must be Attribute, You also need to inherit from Attribute class , And its application scope must be specified , As shown in the following code ：

 [AttributeUsage(AttributeTargets.Class)]// Act on a class 
class sealed UIAttribute:Attribute
{
	public int number;
}

2. How to get features
Get by reflection ( Reflection is generally class 、 File reading ), As shown below ：

[UI(number=100)]
class Fk{
}

void Main()// Here's the imitation c++ Of main Function writing , No need to notice 
{
        UIAttribute[] s = (UIAttribute[])t.GetCustomAttributes(typeof(UIAttribute), false);
        //FKAttribute[] s = t.GetCustomAttributes(typeof(FKAttribute), false) as FKAttribute[];
        foreach(var s1 in s) {
                  Console.WriteLine("fk"+s1.number);
        }
}