如何在对话框中确定它是否由其父项打开为模态或非模态对话框？(How determine within a dialog form if it was opened as a modal or non-modal dialog by its parent?)

 你最好为RefID值创建一个类。 这将允许您这样做： 
 
public class RefContainer {
    // maybe RefID is not an int...?
    public Int32 RefID { get; set; }
}

Session["WorkingList"] = q.Select(x => new RefContainer { RefID = x.RefID });

var workingList = Session["WorkingList"] as IEnumerable<RefContainer>;
if (workingList != null) {
    var nextRecord = workingList
        .SkipWhile(i => i.RefID != currentRecord)
        .Skip(1).First();
}

You're much better off creating a class for the RefID value. This will allow you to do this:
 
public class RefContainer {
    // maybe RefID is not an int...?
    public Int32 RefID { get; set; }
}

Session["WorkingList"] = q.Select(x => new RefContainer { RefID = x.RefID });

var workingList = Session["WorkingList"] as IEnumerable<RefContainer>;
if (workingList != null) {
    var nextRecord = workingList
        .SkipWhile(i => i.RefID != currentRecord)
        .Skip(1).First();
}