项目的默认XML名称空间必须是MSBuild XML名称空间 | 项目的默认XML名称空间必须是MSBuild

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问题描述

我在本地克隆了 ASP.NET Core SignalR存储库，并尝试从以下内容中打开解决方案环境.

I cloned the ASP.NET Core SignalR Repo locally, and try opening the solution from within the following environment.

IDE

Microsoft Visual Studio Enterprise 2015
Version 14.0.25431.01 Update 3
Microsoft .NET Framework
Version 4.6.01055

DOT NET CLI

λ dotnet --info
.NET Command Line Tools (1.0.0-preview2-1-003177)

Product Information:
 Version:            1.0.0-preview2-1-003177
 Commit SHA-1 hash:  a2df9c2576

Runtime Environment:
 OS Name:     Windows
 OS Version:  6.1.7601
 OS Platform: Windows
 RID:         win7-x64

我最终看到很多这类错误消息:

I end up seeing a lot of these kinds of error messages:

我想知道如何解决此问题的正确方法.

I want to know how to fix this the correct way.

推荐答案

您要打开的项目为新的.NET Core csproj格式.这意味着您需要使用支持这种新格式的Visual Studio 2017.

The projects you are trying to open are in the new .NET Core csproj format. This means you need to use Visual Studio 2017 which supports this new format.

回顾一下历史，最初.NET Core使用project.json而不是*.csproj.但是，经过Microsoft的大量内部审议之后，他们决定返回csproj，但使用了更加整洁和更新的格式.但是，此新格式仅在VS2017中受支持.

For a little bit of history, initially .NET Core used project.json instead of *.csproj. However, after some considerable internal deliberation at Microsoft, they decided to go back to csproj but with a much cleaner and updated format. However, this new format is only supported in VS2017.

如果您想打开项目但不想等到3月7日正式发布VS2017，可以使用Visual Studio Code.

If you want to open the projects but don't want to wait until March 7 for the official VS2017 release, you could use Visual Studio Code instead.

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