TL;DR

dotnet add 除了可以對專案增加 reference 外，也可以用來安裝 NuGet 套件。

指令差異：

• Reference： dotnet add <PROJECT> reference <PROJECT_PATH>
• NuGet 套件：dotnet add <PROJECT> package <PACKAGE_NAME>

正文

顯示套件

# No Package
$ dotnet list package
Unable to read a package reference from the project `/Users/fntsr/Projects/dotnet-sln/WebProj/WebProj.csproj`. Please make sure that your project file and project.assets.json file are in sync by running restore.

# Add package(s)
...	

# Have package(s)
$ dotnet list package
Project 'WebProj' has the following package references
   [netcoreapp2.2]:
   Top-level Package                           Requested   Resolved
   > Microsoft.AspNetCore.App            (A)   [2.2.0, )   2.2.0
   > Microsoft.AspNetCore.Razor.Design         2.2.0       2.2.0
   > Microsoft.NETCore.App               (A)   [2.2.0, )   2.2.0
   > Newtonsoft.Json                           12.0.2      12.0.2

(A) : Auto-referenced package.

增加套件

# ~/dotnet-sln/WebProj
$ dotnet add package Newtonsoft.Json
  Writing /var/folders/hx/lgdjx1l93pq08s35hhwb0py40000gn/T/tmpK3nJij.tmp
info : Adding PackageReference for package 'Newtonsoft.Json' into project '/Users/ironman/dotnet-sln/WebProj/WebProj.csproj'.
info : Restoring packages for /Users/ironman/dotnet-sln/WebProj/WebProj.csproj...
info :   GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json
info :   OK https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json 897ms
info : Package 'Newtonsoft.Json' is compatible with all the specified frameworks in project '/Users/ironman/dotnet-sln/WebProj/WebProj.csproj'.
info : PackageReference for package 'Newtonsoft.Json' version '12.0.2' added to file '/Users/ironman/dotnet-sln/WebProj/WebProj.csproj'.
info : Committing restore...
info : Writing assets file to disk. Path: /Users/ironman/dotnet-sln/WebProj/obj/project.assets.json
log  : Restore completed in 6.24 sec for /Users/ironman/dotnet-sln/WebProj/WebProj.csproj.

移除套件

# ~/dotnet-sln/WebProj
dotnet remove package Newtonsoft.Json
info : Removing PackageReference for package 'Newtonsoft.Json' from project '/Users/ironman/dotnet-sln/WebProj/WebProj.csproj'.

設定 NuGet Source

在 Solution 或是 Project 跟目錄底下新增一個 nuget.config 的檔案，並在裡面填入下面的內容。

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="Foo" value="https://foo.bar/nuget" />
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
  </packageSources>
</configuration>

這是指我們會優先使用 https://foo.bar/nuget 作為第一個 NuGet 套件的 Source，如果找不到會再尋找 https://api.nuget.org/v3/index.json 提供的套件清單。