下载安装 
1. Windows10_SDK_10.0.14393.795 StandaloneSDK 600M 
2. vs_professional_us 20G 
win7先安装Windows10_SDK离线包 
安装时不选跨平台App会小很多

VS2017 IDE 
- 启动速度大大加快 
- 开启专案速度加快 
- Build速度快 
- Nuget 速度加快非常多 
- Unit Test 非常棒 
- 免费Source 管理 Git与vsts 很好 
- 執行至所按處鍵 很实用 
- 通过定位游标中间字符串并按 Enter 键，将一个长字符串拆分为多个串联字符串。 
- …….

C#7.0 New 语法试用 
● out variables: 
StringOut(out string ddd); 
Console.Write(ddd);

● Tuples nuget引用System.ValueTuple 
private static (string a,string b,string c) GetFullName()

● Pattern Matching 
switch(obj) 
case int b: data=b++; break; 
case string x: x+=” string”;break; 
…

● Local Functions

● More expression-bodied members 
public CaCheContext(string label) => this.Label = label; 
~CaCheContext() => Console.Error.WriteLine(“Finalized!”);

● throw Expressions 
return a ?? throw new Exception(“异常了!”);

● Generalized async return types nuGet System.Threading.Tasks.Extensions 
public ValueTask CachedFunc() 
引用类型/值類型???

● Numeric literal syntax improvements 
int a = 123_456;