标签：.net pre mon res int() 技术 ogr extension log
微软昨天发布了新的VS 2015 ..随之而来的还有很多很多东西... .NET新版本 ASP.NET新版本...等等..太多..实在没消化..
分享一下也是昨天发布的新的C#6.0的部分新特性吧...
当然..我也没用过 - -,主要是参考国外某位的一篇文章..很详细,英文好的可以自行去看
https://github.com/dotnet/roslyn/wiki/New-Language-Features-in-C%23-6
首先
public class Customer
{
public string First { get; set; } = "Jane";
public string Last { get; set; } = "Doe";
}
public class Customer
{
public string First { get; } = "Jane";
public string Last { get; } = "Doe";
}
public class Customer
{
//只读的属性
public string Name { get; };
//在初始化方法中赋值,可行~
public Customer(string first, string last)
{
Name = first + " " + last;
}
}
在C#5.0中是不可行的 如下图:
public void Print() => Console.WriteLine(First + " " + Last);
//静态导入Console
using static System.Console;
using static System.Math;
using static System.DayOfWeek;
class Program
{
static void Main()
{
//直接使用方法而不用Console.WriteLine
WriteLine(Sqrt(3*3 + 4*4));
WriteLine(Friday - Monday);
}
}
在Main类中静态的导入你要扩展的类型,然后写你需要扩展的方法..?.. - -,不懂..
using static System.Linq.Enumerable; // The type, not the namespace
class Program
{
static void Main()
{
var range = Range(5, 17); // Ok: not extension
var odd = Where(range, i => i % 2 == 1); // Error, not in scope
var even = range.Where(i => i % 2 == 0); // Ok
}
}
int? first = customers?[0].Orders.Count(); //上面的写法等同于下面 int? first = (customers != null) ? customers[0].Orders.Count() : null;
//原来的,我们需要这样..
var s = String.Format("{0} is {1} year{{s}} old", p.Name, p.Age);
//C#6.0中,直接如下:
var s = $"{p.Name} is {p.Age} year{{s}} old";
//在{}中甚至可以是任意的..(单词不会..表达式还是什么鬼.. - -,)反正如下:
var s = $"{p.Name,20} is {p.Age:D3} year{{s}} old";
var s = $"{p.Name} is {p.Age} year{(p.Age == 1 ? "" : "s")} old";
var numbers = new Dictionary<int, string> {
[7] = "seven",
[9] = "nine",
[13] = "thirteen"
};
如果When中用括号括起来的表达式计算结果为true，catch块中运行，否则异常持续。
( - -,然而我也并没有搞懂..求大神解释..)
try { … }
catch (MyException e) when (myfilter(e))
{
…
}
Resource res = null;
try
{
res = await Resource.OpenAsync(…); // You could do this.
…
}
catch(ResourceException e)
{
await Resource.LogAsync(res, e); // Now you can do this …
}
finally
{
if (res != null) await res.CloseAsync(); // … and this.
}
基本到此就结束了, - -,水平有限.不好与不完善的地方请指出..免得误导大家..
标签：.net pre mon res int() 技术 ogr extension log
原文地址：http://www.cnblogs.com/shitaotao/p/7624621.html
