Question

我有一台新的Windows 10笔记本电脑，上面装有VS Pro 2019，当我创建一个非常简单的.net core 2.1项目时，“使用系统”。立即被标记为错误。

CS0246找不到类型或名称空间名称“系统”（您是否缺少using指令或程序集引用？）

我从https://my.visualstudio.com/Subscriptions下载了VS 2019

尝试：

Build - Clean 
Build - Rebuild 
Nuget command dotnet restore 
Deleted /obj folder to regenerate it
Delete .nuget folder to regenerate it
Uninstalled / reinstalled VS Pro 10

如果我将项目属性更改为.net core 2.0，那么问题就消失了。

.net std项目运行正常，没有错误。

using System;  // <== Error on this line and more below

namespace TestCore
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

我在做什么错？这让我发疯。谢谢！

PS：

.NET Core SDK (reflecting any global.json):
 Version:   2.1.700
 Commit:    c2ef055a0f

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.17763
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.1.700\

Host (useful for support):
  Version: 2.1.11
  Commit:  d6a5616240

.NET Core SDKs installed:
  2.1.700 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

.net核心项目“找不到'系统'”

0 个答案: