更新 .NET Core 工具

Update .NET Core Tools

我正在尝试使用 EntityFrameworkCore@3.1。为了在这一点上做到这一点,我已经有了: - 已安装 Visual Studio 2019 预览版 - 安装了 .NET Core 3.1 运行时 - 安装了 .NET Core 3.1 SDK

现在我仍然无法运行命令dotnet ef migrations add xxx。它说我必须更新 dotnet 工具。所以我 运行 在管理员 powershell 中执行以下命令:

PS C:\WINDOWS\system32> dotnet tool update --global dotnet-ef
Tool 'dotnet-ef' was reinstalled with the latest stable version (version '3.0.0')

好的,不包括预览版。所以我尝试明确指定版本:

PS C:\WINDOWS\system32> dotnet tool update --global dotnet-ef --version="3.1.0-preview1.19506.2"
error NU1202: Package dotnet-ef 3.1.0-preview1.19506.2 is not compatible with netcoreapp3.1 (.NETCoreApp,Version=v3.1) / any. Package dotnet-ef 3.1.0-preview1.19506.2 supports: netcoreapp3.1 (.NETCoreApp,Version=v3.1)
Tool 'dotnet-ef' failed to update due to the following:
The tool package could not be restored.
Tool 'dotnet-ef' failed to install. This failure may have been caused by:

* You are attempting to install a preview release and did not use the --version option to specify the version.
* A package by this name was found, but it was not a .NET Core tool.
* The required NuGet feed cannot be accessed, perhaps because of an Internet connection problem.
* You mistyped the name of the tool.

For more reasons, including package naming enforcement, visit https://aka.ms/failure-installing-tool

现在说 .NET Core 3.1 工具与 .NET Core 3.1 不兼容运行时间。

但是,如果我做一个简单的版本检查:

PS C:\WINDOWS\system32> dotnet --version
3.1.100-preview1-014459
PS C:\WINDOWS\system32> dotnet ef --version
Entity Framework Core .NET Command-line Tools
3.0.0

我可以看到 EntityFrameworkCore.Tools 仍然是 3.0.0 版本而不是 3.1.0(我的项目中安装了哪个工具版本)。

我是否还遗漏了什么或者这是一个错误?

感谢@lars-haupt-hansen 指出了这个错误,我 followed the trail to the PR which shows it was merged into "aspnet:release/3.1". The latest 3.1 is still a preview (preview3) [edit: it's out of preview]. You can find and download the latest SDK here

要在 Visual Studio 个项目中使用它,您必须

  1. 从上面安装 SDK link;
  2. 转到工具 > 选项 > 环境 > 预览功能并启用 "Use previews of the .NET Core SDK"; (3.1 不再需要)
  3. 重启 VS (3.1 不再需要)
  4. 转到每个项目属性,然后您可以选择目标框架.NET Core 3.1

然后通过命令行安装 EF Core,运行 dotnet tool install --global dotnet-ef 从您的项目目录。

dotnet tool install -g dotnet-ef --version 3.0.0-preview4.19216.3

dotnet tool install --global dotnet-ef --version 3.0.0-preview8.19405.11