无法安装.NET Standard 2.0

问题描述

我正在尝试创建.NET Standard 2.0项目，但是在项目属性页上，它仅具有.NET Standard 1.6以下的选项。我去了Visual Studio>工具>扩展和更新>更新>产品更新并将Visual Studio 2017升级到最新版本（15.5.4。）

I'm trying to create a .NET Standard 2.0 project, however on the project properties page it only has options up to .NET Standard 1.6. I went to Visual Studio > Tools > Extensions and Updates > Updates > Product Updates and upgraded Visual Studio 2017 to the latest version (15.5.4.)

我还下载了/从这两个网址都安装了.Net Core 2.0 SDK：

I also downloaded / installed the .Net Core 2.0 SDKs from both of these urls:

https://www.microsoft.com/ net / learn / get-started / windows？utm_expid = .- Fmi9Q05Ry2oXQgdtPElHw.0& utm_referrer = http％3A％2F％2Fwww.talkingdotnet.com％2Fwhats-new-in-net-standard-2％2F＃windowscmd

为了很好，我什至重启了，但仍然没有.NET Standard 2.0选项。

For good measure I even rebooted, yet still no .NET Standard 2.0 option. What gives?

产品信息：版本：2.1.4提交SHA-1哈希：
5e8add2190

Product Information: Version: 2.1.4 Commit SHA-1 hash: 5e8add2190

运行时环境：操作系统名称：Windows操作系统版本：10.0.16299
操作系统平台：Windows RID：win10-x64基本路径：C：\Program
Files\dotnet\sdk\2.1.4\

Runtime Environment: OS Name: Windows OS Version: 10.0.16299 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\2.1.4\

Microsoft .NET Core共享框架主机

Microsoft .NET Core Shared Framework Host

版本：2.0.5构建：
17373eb129b3b05aa18ece963f8795d65ef8ea54

Version : 2.0.5 Build : 17373eb129b3b05aa18ece963f8795d65ef8ea54

推荐答案

事实证明有人在我们的存储库根目录中放置了一个global.json文件，将SDK硬编码为1.x预览版本。一旦将其更新为2.1.4，我就开始获得.NET Standard 2.0项目选项！

It turns out that someone had put a global.json file at the root of our repo that was hard-coding the SDK to a 1.x preview version. Once I updated that to 2.1.4, I started getting the .NET Standard 2.0 project option!

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