将wpf转换/创建为.net.core

Question

将wpf解决方案转换为Net.Core时遇到严重麻烦

我所拥有的：Visual Studio 2019版本16.2.3

Net.Core SDK's

.NET Core SDK (gemäß "global.json"):
 Version:   3.0.100-preview8-013656
 Commit:    8bf06ffc8d

Laufzeitumgebung:
 OS Name:     Windows
 OS Version:  10.0.18362
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.0.100-preview8-013656\

Host (useful for support):
  Version: 3.0.0-preview8-28405-07
  Commit:  d01b2fb7bc

.NET Core SDKs installed:
  2.2.401 [C:\Program Files\dotnet\sdk]
  3.0.100-preview8-013656 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0-preview8.19405.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0-preview8-28405-07 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0-preview8-28405-07 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

如果我尝试转换解决方案，则会收到以下消息，我会收到转到“选项/预检”的消息，并选中“使用Net.SDK的预览”，但找不到此复选框，只有一个复选框可以调用msbuild

转换解决方案时，出现错误，提示我安装了错误的SDK。

谢谢彼得