c # 6.0 language features

N kinds of writing fennel beans

the using the System;
 the using the System.Collections.Generic;
 the using the System.Linq;
 the using System.Net.Http;
 the using the System.Text;
 the using System.Threading.Tasks;
 // static import (static method for introducing a single category of 
the using  static the System.Math ;
 the using  static System.String the;
 namespace Language._6._0 
{ 
    public  class Student 
    { 
        // read-only attribute 
        public  String FirstName { GET ;}
         // automatic initialization expression property 
        public  String the LastName {GET ; SET ;} = " Wang " ; 

        // the Expression-bodied function member
         // the string interpolation 
        public  the override  String the ToString () => $ " {the LastName FirstName} {} " ; 

        public  String the FullName => $ " {FirstName the LastName} {} " ; 

        public Student (Student OTHER) 
        { 
            // null operator conditions 
            the this ? .lastName = OTHER .lastName;
             // equivalent = OTHER == null null this.LastName: other.LastName;? 

            //Null coalescing operator (??) to the left of the operator is not empty then return to the left, or the right to return 
            the this .lastName = OTHER .lastName ??? " The Test " ; 
            Console.WriteLine ( the this .lastName); 
            Console.WriteLine ( the this .ToString ());
             // exception filter 
            the try 
            { 
                the throw  new new HttpRequestException ( " aaaa301 " ); 
            } 
            the catch (System.Net.Http.HttpRequestException E) When (e.Message.Contains ( " 301 " )) 
            { 
                Console. the WriteLine ( " Site Moved");
            }

            //nameof
            Console.WriteLine(nameof(this.FirstName));//FirstName

            //使用索引器初始化关联集合
            Dictionary<int, string> webErrors = new Dictionary<int, string>
            {
                [404] = "Page not Found",
                [302] = "Page moved, but left a forwarding address.",
                [500] = "The web server can't come out to play today."
            };
            Console.WriteLine(webErrors[404]);//Page not Found

            //
            Task.Run(()=>this.ToString());

        }


        


    }
}