The current .NET SDK does not support targeting .NET Core 3.0
编译错误
Severity Code Description Project File Line Suppression State
Error NETSDK1045 The current .NET SDK does not support targeting .NET Core 3.0. Either target .NET Core 2.1 or lower, or use a version of the .NET SDK that supports .NET Core 3.0. TestApp C:\Program Files\dotnet\sdk\2.1.504\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets 137
官方只提供了 .net core 2.2
https://dotnet.microsoft.com/download
仔细查看后，发现置顶了preview 
打开project，查看项目的target framework，有install other frameworks的选项
https://dotnet.microsoft.com/download/visual-studio-sdks?utm_source=getdotnetsdk&utm_medium=referral
.NET Core 3.0.0 Preview 2 - January 29, 2019
https://github.com/dotnet/core/blob/master/release-notes/3.0/preview/3.0.0-preview2.md
解决方法
安装 dotnet-sdk-3.0.100-preview-010184-win-x64.exe
打开preview的开关
安装vs2019
To create or open applications targeting .NET Core 3.0, Visual Studio 2019 or newer is required. Click the following link to download the latest version of Visual Studio 2019. If you are after an offline installation follow these instructions on how to install offline.
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