1. 静态using(static using)
静态using声明允许不使用类名直接调用静态方法。
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The static using declaration allows invoking static methods without the classname.In C# 5using System;Console.WriteLine("Hello, World!");In C# 6using static System.Console;WriteLine("Hello, World"); |
2. 表达式方法(Expression-Bodied Methods)
使用表达式方法，只有一条语句的方法可以使用lambda语法写。
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With expression-bodied methods, a method that includes just one statement canbe written with the lambda syntax.In C# 5public bool IsSquare(Rectangle rect){return rect.Height == rect.Width;}In C# 6public bool IsSquare(Rectangle rect) => rect.Height == rect.Width; |
3. 表达式属性(Expression-Bodied Properties)
跟表达式方法类似，只有一个get访问器的单行属性可以使用lambda语法写。
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Similar to expression-bodied methods, one-line properties with only a get accessorcan be written with the lambda syntaxIn C# 5public string FullName{get{return FirstName +"" + LastName;}}In C# 6public string FullName => FirstName +"" + LastName; |
4. 自动属性初始化器(Auto-Implemented Property Intializers)
自动属性可以使用属性初始化器初始化。
Auto-implemented properties can be initialized with a property initializer.
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In C# 5public class Person{public Person(){Age = 24;}public int Age {get; set;}}In C# 6public class Person{public int Age {get; set;} = 42;} |
5. 只读自动属性(Read-Only Auto Properties)
C# 5需要完整的属性语法实现只读属性，C# 6可以使用自动属性实现。
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To implement read-only properties, C# 5 requires the full property syntax. WithC# 6, you can do this using auto-implemented properties.In C# 5private readonly int _bookId;public BookId{get{return _bookId;}}In C# 6public BookId {get;} |
6. nameof操作符(nameof Operator)
字段、属性、方法和类型的name可以通过nameof访问。使用nameof，可以方便的重构name变化。
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With the new nameof operator, names of fields, properties, methods, or types canbe accessed. With this, name changes are not missed with refactoring.In C# 5public void Method(object o){if (o == null) throw new ArgumentNullException("o");In C# 6public void Method(object o){if (o == null) throw new ArgumentNullException(nameof(o)); |
7. Null传递操作符(Null Propagation Operator)
Null传递操作符简化了空值检查。
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The null propagation operator simplifies null checks.In C# 5int? age = p == null ? null : p.Age;var handler = Event;if (handler != null){handler(source, e);}In C# 6int? age = p?.Age;handler?.Invoke(source, e); |
8. 字符串插值(String Interpolation)
字符串差值移除了对string.Format的调用，使用表达式占位符取代数字格式占位符。
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The string interpolation removes calls to string.Format. Instead of usingnumbered format placeholders in the string, the placeholders can includeexpressions.In C# 5public override ToString(){return string.Format("{0}, {1}", Title, Publisher);}In C# 6public override ToString() => $"{Title} {Publisher}"; |
9. 字典初始化器(Dictionary Initializers)
字典可以使用类似集合的字典初始化器初始化。
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Dictionaries can now be initialized with a dictionary initializer—similar to thecollection initializer.In C# 5var dict = new Dictionary<int, string>();dict.Add(3,"three");dict.Add(7,"seven");In C# 6var dict = new Dictionary<int, string>(){[3] ="three",[7] ="seven"}; |
10. 异常过滤器(Exception Filters)
异常过滤器允许你在捕获异常前进行过滤。
Exception filters allow you to filter exceptions before catching them.
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In C# 5try{//etc.} catch (MyException ex){if (ex.ErrorCode != 405) throw;// etc.}In C# 6try{//etc.} catch (MyException ex) when (ex.ErrorCode == 405){// etc.} |
11. 在Catch使用Await(Await in Catch)
await可以在catch块中直接使用，C# 5中需要变通使用。
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await can now be used in the catch clause. C# 5 required a workaround.In C# 5bool hasError = false;string errorMessage = null;try{//etc.} catch (MyException ex){hasError = true;errorMessage = ex.Message;} if (hasError){await new MessageDialog().ShowAsync(errorMessage);}In C# 6try{//etc.} catch (MyException ex){await new MessageDialog().ShowAsync(ex.Message);} |
以上所述是小编给大家介绍的C# 6.0 新特性汇总，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://www.cnblogs.com/zhangdk/archive/2016/09/27/5914182.html
