netcoreapp3.1 
namespace System.Drawing.Design
{
    [Guid("4BACD258-DE64-4048-BC4E-FEDBEF9ACB76")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IToolboxService
    {
        void AddLinkedToolboxItem(ToolboxItem toolboxItem, IDesignerHost host);
    }
}
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Reference this API
.NET
5.06.07.08.09.0
.NET Core
3.03.1
.NET Framework
1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to netcoreapp3.1
Assembly

System.Windows.Forms.Design , Version=4.0.0.0, PublicKeyToken=b77a5c561934e089

Referencing

Requires all:

  • You need to build and run on Windows.

  • Your project needs to set <UseWindowsForms>True</UseWindowsForms>.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API