Unable to load COM components in.NET 5.0 WPF

[lifuhua123]

• .NET Core Version: .net 5.0
• Windows version: win 10 x64
• Does the bug reproduce also in WPF for .NET Framework 4.8?: No

• Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? NO

  Problem description: An error occurs when I try to call an OCX control on an external device in.NET 5.0 WPF :“Could not find assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Either explicitly load this assembly using a method such as LoadFromAssemblyPath() or use a MetadataAssemblyResolver that returns a valid assembly.”
  Actual behavior:

  Expected behavior:

  Minimal repro:

[lifuhua123]

[lindexi]

@lifuhua123 Adding the WinForms reference to your project by edit your csproj file.

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

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFrameworks>netcoreapp3.1;net5-windows</TargetFrameworks>
    <UseWPF>true</UseWPF>
    <UseWindowsForms>true</UseWindowsForms>
  </PropertyGroup>

</Project>

双击项目文件，进入编辑项目文件，项目文件就是 csproj 文件，尝试在 PropertyGroup 里面加上 UseWindowsForms 属性，如上面代码