VolumeSecuritySettings

public bool IsOpenInterest { get; set; }

value = volumeSecuritySettings.IsOpenInterest
volumeSecuritySettings.IsOpenInterest = value

Use open interest for VolumeLevel.

public Unit VolumeLevel { get; set; }

value = volumeSecuritySettings.VolumeLevel
volumeSecuritySettings.VolumeLevel = value

量触发会导致切换到下一份合同.