Usage of Attributes in C#

[AttributeUsage( | , AllowMultiple = true, Inherited = true)]
//AttributeTargets: The target type to which the attribute is applied.  AllowMultiple: Whether to allow multiple this attributes to be applied in one element.  Inherited: Can attributes be inherited by derived classes?public class CodeStatusAttribute : Attribute
{
    private string status;
    public CodeStatusAttribute(string status)//Constructor is positional parameter    {
         = status;
    }
    public string Tester { set; get; }//Properties and public fields are named parameters    public string Coder { set; get; }
    
    public override string ToString()
    {
        return status;
    }
}

//1. Use a single attribute[CodeStatus("Plain a")]
public class Tringe
{ }

//2. Use multiple attributes[CodeStatus("B version", Coder = "Little Li")]
[CodeStatus("B version", Coder = "Xiao Wang")]
//It is also possible [CodeStatus("aa",Coder="Xiao Li"),CodeStatus("aa",Coder="Xiao Wang")]public class Square
{ }

//3. Use positional parameters and named parameters//type means what element this property is associated with, which may include: assembly, field, method, param, property, return, moudule, event, type, etc.  .[type: CodeStatus("Final Edition", Coder = "Little Li", Tester = "Old Li")]
public class Circle
{
    [CodeStatus("Final Edition", Coder = "Little Li", Tester = "Old Li")]
    public Circle()
    {

    }
}

//1. Get the attributes on the class.Type t = typeof(Circle);
Attribute[] attArr = (t, typeof(CodeStatusAttribute));
//orobject[] attArr1 = (typeof(CodeStatusAttribute), true);

//2. Get the attributes on the memberAttribute[] attArr3 = ()[0].GetCustomAttributes().ToArray();//Constructor, get field GetField("..")
//3, traversalforeach (Attribute attr in attArr3)
{
    CodeStatusAttribute item = (CodeStatusAttribute)attr;
    (() +  + );
}

[Condeitonal] //Condition control[Obsolete] //Abandoned attributes[Serializable]//Serializable properties[AssemblyDelaySign] //Assembly delay signature