我有一个这样的模型绑定器：

public class CustomQuarantineModelBinder : IModelBinderProvider
{
    public IModelBinder GetBinder(ModelBinderProviderContext context)
    {
        if (context == null)
        {
            throw new ArgumentNullException(nameof(context));
        }

        if (context.Metadata.ModelType.GetInterfaces().Contains(typeof(IQuarantineControl))
        {
            return new QuarantineModelBinder();
        }

        return null;
    }
}

public class QuarantineModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext modelBindingContext)
    {
        char[] delimeter = { '|' };

        if (modelBindingContext == null)
        {
            throw new ArgumentNullException(nameof(modelBindingContext));
        }

        var model = Activator.CreateInstance(modelBindingContext.ModelType);

        if (modelBindingContext.ModelType.GetInterfaces().Contains(typeof(IQuarantineControl)))
        {
            var qc = model as IQuarantineControl;

            if (qc != null)
            {
                var request = modelBindingContext.HttpContext.Request;
                string QuarantineControl = request.Form["QuarantineControl"];

                if (!string.IsNullOrEmpty(QuarantineControl))
                {
                    string[] components = QuarantineControl.Split(delimeter);

                    qc.QuarantineClear();
                    qc.QuarantineControlID = Convert.ToInt32(components[0]);
                    qc.QuarantineState = (QuarantineState)Convert.ToInt32(components[1]);
                    for (int i = 2; i < components.Length; i++)
                    {
                        qc.QuarantineReasons.Add(components[i]);
                    }
                }
            }
        }

        modelBindingContext.Result = ModelBindingResult.Success(model);
        return Task.CompletedTask;
    }

但是，模型中的其他字段将变为null或空。我希望设置QuarantineState、QuarantineControlId等，而不影响其他值。谢谢