Cannot build project successfully

[John-Qiao]

• .NET Core Version:
  5.0.100-rc.1.20380.12

• Have you experienced this same bug with .NET Framework?:
  No

More info:
This issue does not occur in 5.0.100-rc.1.20378.11, it's a regression issue.

Problem description:
Cannot build project successfully, and received the below error:

Expected behavior:
Can build project successfully.

Minimal repro:

1. Create a new .NET Core Winforms project and target to .NET 5.0.
2. Build this project.
   WindowsFormsApp1.zip

[RussKie]

It is not something we control.

Having said that, I think the error is self explanatory:

C:\Program Files\dotnet\sdk\5.0.100-rc.1.20403.5\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.DefaultItems.targets(369,5): 
warning NETSDK1137: It is no longer necessary to use the Microsoft.NET.Sdk.WindowsDesktop SDK. Microsoft.NET.Sdk can be used instead. [.\WindowsFormsApp1\WindowsFormsApp1\WindowsFormsApp1.csproj]

To fix remove ".WindowsDesktop":

-<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+<Project Sdk="Microsoft.NET.Sdk">

[RussKie]

From @jmarolf elsewhere:

"The fix on the VS side went in this morning. I reccommend setting <AnalysisLevel>4</AnalysisLevel> in the project file until the next SDK and VS previews actually go out"