卸載、指定卸載 .NET Core Runtime and SDK

項目使用的 Nuget 包，比如 Microsoft.AspNetCore.App等的版本號要與 .NET Core 版本號（不是SDK版本號，后續說明）保持一致，否則編譯或者運行的時候可能會出現一些稀奇古怪的錯誤。

二. 版本對照

https://www.microsoft.com/net/download/dotnet-core/2.1

二. 版本對照

1.查看所有安裝的SDK

$ dotnet --list-sdks
1.0.0-preview2-003121 [/usr/local/share/dotnet/sdk]
1.0.1 [/usr/local/share/dotnet/sdk]
2.0.3 [/usr/local/share/dotnet/sdk]
2.1.300 [/usr/local/share/dotnet/sdk]
2.1.403 [/usr/local/share/dotnet/sdk]

2.查看運行時

$ dotnet --list-runtimes
Microsoft.AspNetCore.All 2.1.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 1.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 1.0.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 1.1.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

卸載 .NET Core Runtime and SDK

鏈接：

MAC上面，通過刪除包含版本的目錄，分開卸載SDKs 和 runtimes（SDK 和 runtime的目錄，通過 dotnet --list-sdks 和 dotnet --list-runtimes 命令顯示），例如刪除 1.0.1 SDK 和 runtime，命令如下：

sudo rm -rf /usr/local/share/dotnet/sdk/1.0.1
sudo rm -rf /usr/local/share/dotnet/shared/Microsoft.NETCore.App/1.0.1
sudo rm -rf /usr/local/share/dotnet/shared/Microsoft.AspNetCore.App/1.0.1
sudo rm -rf /usr/local/share/dotnet/host/fxr/1.0.1

從 .NET Core 2.1 開始, 使用package manager升級時，不再需要卸載 .NET Core SDK ，新版本安裝成功會自動刪除舊版本。

指定SDK版本

.NET Core 版本:  .NET Core 項目默認使用最新版本的 .NET Core

SDK版本： 指定項目SDK版本，dotnet new global.json --sdk-version <SDK版本號>