Extension method CreateViewDataDictionary to create a new ViewDataDictionary in ASP.NET Core

ContextExtensions.cs

public static ViewDataDictionary<T> CreateViewDataDictionary<T>(this HttpContext httpContext, T model)
{
    var modelMetadataProvider = httpContext.ApplicationServices.GetRequiredService<IModelMetadataProvider>();
    return new ViewDataDictionary<T>(modelMetadataProvider, new ModelStateDictionary())
    {
        Model = model
    };
}