xamarinmac 
namespace Microsoft.Extensions.Hosting
{
    public class HostBuilder : IHostBuilder
    {
        public IDictionary<object!, object!>! Properties { get; }
    }
}
nuget.org
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assemblies

Microsoft.Extensions.Hosting , Version=10.0.0.0, PublicKeyToken=adb9793829ddae60

Microsoft.Extensions.Hosting , Version=9.0.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.Extensions.Hosting.

Package Microsoft.Extensions.Hosting (10.0.0-preview.1.25080.5) netstandard2.1
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API