2017 微軟一個比較大的動作就是.Net core2.0了，微軟出的這個框架野心很大：它可以讓使用者在幾乎所有的PC終端用C#編寫自己的應用程式。在win/Linux/mac三大主流作業系統通吃之後，.Net core居然也支援Docker！
本文試著在Centos7執行自己的C#程式，其他作業系統包括Windows，MacOS和docker上的教程見官網：.Net Core
首先需要安裝libunwind和libicu以及.Net SDK：

sudo yum install libunwind libicu
curl -sSL -o dotnet.tar.gz https://aka.ms
 
/dotnet-sdk-2.0.0-linux-x64

然後新建個目錄，把剛才下載的dotnet.tar.gz解壓：

mkdir dotnet
cp dotnet.tar.gz  dotnet
cd dotnet && tar -xzvf dotnet.tar.gz

接下來把剛才解壓dotnet.tar.gz的那個目錄加到系統變數，就可以在CentOS7寫C#程式碼了。

vim ~/.bashrc

加入以下程式碼：

export DOTNET_HOME=/home/dotnet #dotnet解壓後目錄
export PATH=$DOTNET_HOME:$PATH  #系統變數
 

然後讓系統變數生效：

source ~/.bashrc

接下來試下dotnet是否安裝成功：

dotnet --help

如果列印以下提示，說明安裝成功：

.NET Command Line Tools (2.0.0)
Usage: dotnet [runtime-options] [path-to-application]
Usage: dotnet [sdk-options] [command] [arguments] [command-options]

path-to-application:
  The path to an application .dll file
 
 to execute.

SDK commands:
  new              Initialize .NET projects.
  restore          Restore dependencies specified in the .NET project.
  run              Compiles and immediately executes a .NET project.
  build            Builds a .NET project.
  publish          Publishes a .NET project for deployment (including the runtime).
  test             Runs unit tests using the test runner specified in the project.
  pack             Creates a NuGet package.
  migrate          Migrates a project.json based project to a msbuild based project.
  clean            Clean build output(s).
  sln              Modify solution (SLN) files.
  add              Add reference to the project.
  remove           Remove reference from the project.
  list             List reference in the project.
  nuget            Provides additional NuGet commands.
  msbuild          Runs Microsoft Build Engine (MSBuild).
  vstest           Runs Microsoft Test Execution Command Line Tool.

Common options:
  -v|--verbosity        Set the verbosity level of the command. Allowed values are q[uiet], m[inimal], n[ormal], d[etailed], and diag[nostic].
  -h|--help             Show help.

Run 'dotnet COMMAND --help' for more information on a command.

sdk-options:
  --version        Display .NET Core SDK version.
  --info           Display .NET Core information.
  -d|--diagnostics Enable diagnostic output.

runtime-options:
  --additionalprobingpath <path>    Path containing probing policy and assemblies to probe for.
  --fx-version <version>            Version of the installed Shared Framework to use to run the application.
  --roll-forward-on-no-candidate-fx Roll forward on no candidate shared framework is enabled.
  --additional-deps <path>          Path to additonal deps.json file.

接下來新建一個類似於windows下的控制檯程式hwapp：

dotnet new console -o hwapp

最後執行以下命令，程式就會在終端列印”hello world”：

cd hwapp
dotnet restore  #編譯
dotnet run      #執行