WPF中添加System.Windows.Forms.dll

在项目文件中添加配置项 <UseWindowsForms>true</UseWindowsForms> 即可，位置如下：

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<PropertyGroup>
  <TargetFramework>net6.0-windows</TargetFramework>
  <Nullable>enable</Nullable>
  <UseWPF>true</UseWPF>
  <UseWindowsForms>true</UseWindowsForms>
</PropertyGroup>