C# 6.0 新特征 Demo

using System;
using System.Collections.Generic;
using System.Text;
using static System.Math;

namespace ConsoleApp1
{
    public class CSharp6
    {
        //属性默认值
        public static string Name { get; set; } = "jefft";        
        public IList<int> AgeList
        {
            get;
            set;
        } = new List<int> { 10, 20, 30, 40, 50 };

        //Dic新的赋值方法
        public IDictionary<int, string> DicNew = new Dictionary<int, string>()
        {
            [4] = "first",
            [5] = "second"
        };

        //属性Lambda表达式
        public static string NameField => string.Format("姓名: {0}", Name);
        public static void PrintNameField() => Console.WriteLine(NameField);

        public static void TestStaticImport()
        {          
            Console.WriteLine($"导入Math静态类之后可直接使用方法: Pow(4, 2) = {Pow(4, 2)}");             
        }

        public static void TestNullKey()
        {
            int? x = null;
            int? y = x + 40;
            int? z = 40 + x ;

            Console.WriteLine($"?.符号的使用: X={x},Y={y?.ToString()}, Z={z?.ToString()}");
        }
         
        public static void TestExceptionFilter(int exceptionValue = 10)
        {        
            try
            {
                Int32.Parse("s");
            }
            catch (Exception e) when (exceptionValue > 1)//满足条件才进入catch
            {
                Console.WriteLine($"条件满足下捕捉：{e.Message}");               
            } 
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        public static void TestNameOf()
        {
             Console.WriteLine("nameof测试结果");
             Console.WriteLine(nameof(Name));
             Console.WriteLine(nameof(NameField));
             Console.WriteLine(nameof(PrintNameField));
        }
    }     
}

 static void Csharp6Test()
        {
            CSharp6.PrintNameField();
            CSharp6.TestStaticImport();
            CSharp6.TestNullKey();
            CSharp6.TestExceptionFilter();
            CSharp6.TestNameOf();

            Console.ReadLine();
        }