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。
The static using declaration allows invoking static methods without the class name. In C# 5 using System; Console.WriteLine("Hello, World!"); In C# 6 using 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。
With expression-bodied methods, a method that includes just one statement can be written with the lambda syntax. In C# 5 public bool IsSquare(Rectangle rect) { return rect.Height == rect.Width; } In C# 6 public 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。
Similar to expression-bodied methods, one-line properties with only a get accessor can be written with the lambda syntax In C# 5 public string FullName { get { return FirstName +"" + LastName; } } In C# 6 public 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.
In C# 5 public class Person { public Person() { Age = 24; } public int Age {get; set;} } In C# 6 public 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。
To implement read-only properties, C# 5 requires the full property syntax. With C# 6, you can do this using auto-implemented properties. In C# 5 private readonly int _bookId; public BookId { get { return _bookId; } } In C# 6 public 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。
With the new nameof operator, names of fields, properties, methods, or types can be accessed. With this, name changes are not missed with refactoring. In C# 5 public void Method(object o) { if (o == null) throw new ArgumentNullException("o"); In C# 6 public 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。
The null propagation operator simplifies null checks. In C# 5 int? age = p == null ? null : p.Age; var handler = Event; if (handler != null) { handler(source, e); } In C# 6 int? 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。
The string interpolation removes calls to string.Format. Instead of using numbered format placeholders in the string, the placeholders can include expressions. In C# 5 public override ToString() { return string.Format("{0}, {1}", Title, Publisher); } In C# 6 public 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。
Dictionaries can now be initialized with a dictionary initializer—similar to the collection initializer. In C# 5 var dict = new Dictionary<int, string>(); dict.Add(3,"three"); dict.Add(7,"seven"); In C# 6 var 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.
In C# 5 try { //etc. } catch (MyException ex) { if (ex.ErrorCode != 405) throw; // etc. } In C# 6 try { //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。
await can now be used in the catch clause. C# 5 required a workaround. In C# 5 bool hasError = false; string errorMessage = null; try { //etc. } catch (MyException ex) { hasError = true; errorMessage = ex.Message; } if (hasError) { await new MessageDialog().ShowAsync(errorMessage); } In C# 6 try { //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们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！