C#6新特性，让你的代码更干净

//老语法，一个类想要初始化几个私有属性，那就得在构造函数上下功夫。
public class Post
{
    public DateTime DateCreated { get; private set; } 
    public List Comments { get; private set; } 

    public Post()
    {
        DateCreated = DateTime.Now;
        Comments = new List();
    }
 }

 public class Comment
 {

 }

//用新特性，我们可以这样初始化私有属性，而不用再创建构造函数

  public class Post
  {
     public DateTime DateCreated { get; private set; } = DateTime.Now;
     public List Comments { get; private set; } = new List();
  }

  public class Comment
  {

  }

 var dictionary = new Dictionary
  {
       { "key1","value1"},
        { "key2","value2"}
   };

//新特性
 var dictionary1 = new Dictionary
  {
         ["key1"]="value1",
         ["key2"]="value2"
  };

Post post = new Post();
post.Title = "Title";
post.Content = "Content";

//通常情况下我们都这么写
string t1= string.Format("{0}_{1}", post.Title, post.Content);


//C#6里我们可以这么写，后台引入了$，而且支持智能提示。 
string  t2 = $"{post.Title}_{post.Content}";
         

//老的语法，简单却繁琐。我就觉得很繁琐
Post post = null;
string title = "";
if (post != null)
{
      title = post.Title;
}


//C#6新特性一句代码搞定空判断
title = post?.Title;

Post post = null;
List posts = null;

 if (posts != null)
 {
      post = posts[0];
  }

//新特性，我们也是一句代码搞定。是不是很爽？
post = posts?[0];

public class Post
{
      public int Votes{get;private set;}
}


//新特性用这种方式
public class Post
{
     public int Votes{get;}
}

public class Post
 {
        
       public int AddOld()
        {
            return 1 + 1;
        }
 
       //新特性还是用Lambda的语法而已
        public int AddNew() => 1+1;

    }

C#6新特性，让你的代码更干净

标签：set   cti   拼接   add   -o   div   代码   die   comm   

原文地址：https://www.cnblogs.com/sexintercourse/p/12118459.html