C# 如果验证事件有两个不同的侦听器，其中一个设置Cancel=true，另一个设置Cancel=false，则会发生t？我和你有同样的感觉；这里的表面下潜藏着不好的东西；o） public delegate void ItemValidationEventHa

如果验证事件有两个不同的侦听器，其中一个设置Cancel=true，另一个设置Cancel=false，则会发生t？我和你有同样的感觉；这里的表面下潜藏着不好的东西；o）

public delegate void ItemValidationEventHandler(object sender, ItemValidationEventArgs e);

public class ItemValidationEventArgs : CancelEventArgs
{
    public ItemValidationEventArgs(object item, ObjectAction state, EventArgs e)
    {
        Item = item;
        State = state;
        EventArgs = e;
    }

    public ItemValidationEventArgs(object item, ObjectAction state) : this(item, state, new EventArgs())
    {
    }

    public ItemValidationEventArgs() : this(null, ObjectAction.None, new EventArgs())
    {
    }

    // is there a better way to pass this info?
    public string ErrorMessage {get; set;}
    public int ErrorNumber {get;set;}

    public object Item { get; private set; }
    public ObjectAction State { get; private set; }

    public EventArgs EventArgs { get; private set; }
}

virtual bool Validate(object item, ObjectAction action, out string errorMessage) 

protected virtual bool Validate(object item);

class ValidationResult
{
     public string ResultMessage{get;set;}
     public bool IsValid {get;set;}
}

protected virtual ValidationResult Validate(object item)
{
   ValidationResult result = new ValidationResult();

   // validate and set results values accordingly

   return result;
}