Question

我使用nhibernate拦截器比较旧状态的值和实体属性的当前状态，但是某些属性的类型为ICollection，所以任何人都可以指导我如何检查对象是否属于输入ICollection

这是我的代码

    public void OnPostUpdate(NHibernate.Event.PostUpdateEvent @event)
    {
        var entityToAudit = @event.Entity as IAuditable;
        string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "AuditLog.txt");
        using (StreamWriter sw = File.AppendText(path))
        {
            for (int i = 0; i < @event.OldState.Length; i++)
            {
                string propertyName = @event.Persister.PropertyNames[i];
                if (@event.OldState[i] != null)
                {
                    if (!@event.OldState[i].Equals(@event.State[i]))
                    {
                        sw.WriteLine("the value of "+ propertyName + " has been changed from " + @event.OldState[i] + " to " + @event.State[i]);
                    }
                }
                else
                {
                    if (@event.State[i] != null)
                    {
                        sw.WriteLine("the value of "+ propertyName + " has been changed from being empty to " + @event.State[i]);
                    }
                }
            }
        }
    }

Answer 1

您有多个选项可以执行此操作，使用或使用作为进行空检查：

if (obj is ICollection){
    //your logic
}

或者，如果您稍后需要将该对象作为ICollection，我建议使用作为：

var icoll = obj as ICollection
if (icoll != null){
    //use icoll
    //icoll.Something();
}

Answer 2

您可以使用简单的检查类型像这样：

var obj = getObject();
if(obj is TypeYouWant)
    doSomething();

祝你好运

如何检查状态对象是否为ICollection类型

2 个答案: