net9.0 
namespace Microsoft.EntityFrameworkCore
{
    public static class CosmosModelExtensions : Object
    {
        public static ?! SetDiscriminatorInKey(this IMutableModel! model, Nullable<IdDiscriminatorMode!>! behavior);
    }
}
.NET 8.09.010.0
Information specific to net9.0
Assembly

Microsoft.EntityFrameworkCore.Cosmos , Version=9.0.3.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.EntityFrameworkCore.Cosmos.

Package Microsoft.EntityFrameworkCore.Cosmos (9.0.3) net8.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API