不调用构造函数方法的类的新实例。 [英] New instance of a class not calling the constructor method.
问题描述
当我从文件读取数据时，数据按预期读入，但是当读入所有数据时，窗口表单只是加载并且操作完成。它没有创建一个类的新实例（在这种情况下是一个带有吸引力的事件），但只是加载空白表单而不读取文件的下一部分。我一直在踩到最后一小时的断点，我无法弄清楚为什么它没有构建新事件。任何帮助？
When I read data in from a file, the data is read in as expected but when all data is read in, the windows form just loads up and the operation is finished. It has not created a new instance of a class (in this case an event with attractions) but simply loaded up the blank form without reading the next part of the file. I have been stepping in to breakpoints for the last hour and I cannot figure out why it is not constructing the new event. Any help?
public static void readEvents(string theFile, ArrayList allEvents)
{
//local variables
StreamReader inEvents = null;
bool anyMoreEvents = false;
string[] eventData = new string[frmEVMHome.numEventItems];
string[] attractionData = new string[frmEVMHome.numAttractionItems];
Event tempEvent;
Attraction tempAttraction;
int numOfAttractionsInEvent;
//if file opened ok proceed
if (Utilities.fileOpenForReadOK(theFile, ref inEvents))
{
//read first event attractions
anyMoreEvents = Utilities.getNext(frmEVMHome.numEventItems, inEvents, eventData);
//loop for all events in file
while (anyMoreEvents == true)
{
numOfAttractionsInEvent = Convert.ToInt32(eventData[11]);
//EVENT ORDER = 1eventDescription 2eventDate 3eventStartTime 4eventEndTime 5eventAddress 6eventNumOfGuests
//7eventContactName 8eventContactemail 9eventContactPhone 10eventContactMobile 11eventCost 12eventNumOfAttractions 13eventAttractions.
tempEvent = new Event(eventData[0], Convert.ToDateTime(eventData[1]), Convert.ToInt32(eventData[2]),
Convert.ToInt32(eventData[3]), eventData[4], Convert.ToInt32(eventData[5]), eventData[6], eventData[7],
Convert.ToInt32(eventData[8]), Convert.ToInt32(eventData[9]), Convert.ToInt32(eventData[10]), numOfAttractionsInEvent);
//Read all attractions into event
for (int i = 0; i < numOfAttractionsInEvent; i++)
{
getNext(frmEVMHome.numAttractionItems, inEvents, attractionData);
//ATTRACTION ORDER = attractionDescription, attractionStaff, attractionLength, attractionWidth,
// attractionHeight, attractionCost.
tempAttraction = new Attraction(attractionData[0], Convert.ToInt32(attractionData[1]), Convert.ToInt32(attractionData[2]),
Convert.ToInt32(attractionData[3]), Convert.ToInt32(attractionData[4]), Convert.ToInt32(attractionData[5]));
tempEvent.addAttractionToEvent(tempEvent.getEventAttractions(), tempAttraction);
}
//Add Events (including all its attractions) into the data structure
allEvents.Add(tempEvent);
anyMoreEvents = getNext(frmEVMHome.numEventItems, inEvents, eventData);
}
和类构造函数
And the Class constructor
public Event(string ineventDescription, DateTime ineventDate, int ineventStartTime,
int ineventEndTime, string ineventAddress, int ineventNumOfGuests,
string ineventContactName, string ineventContactEmail, int ineventContactPhone,
int ineventContactMobile, int ineventCost, int ineventNumOfAttractions)
{
eventDescription = ineventDescription;
eventDate = ineventDate;
eventStartTime = ineventStartTime;
eventEndTime = ineventEndTime;
eventAddress = ineventAddress;
eventNumOfGuests = ineventNumOfGuests;
eventContactName = ineventContactName;
eventContactEmail = ineventContactEmail;
eventContactPhone = ineventContactPhone;
eventContactMobile = ineventContactMobile;
eventCost = ineventCost;
eventNumOfAttractions = 0;
eventAttractions = new ArrayList(); //empty list for new object
}
推荐答案
我做的第一件事是敲一个框架并创建一个实例：
The first thing I did was knock up a framework and create an instance:
public void DoIt()
{
Event e = new Event("", DateTime.Now, 0, 0, "", 0, "", "", 0, 0, 0, 0);
}
public class Event
{
private string eventDescription;
private DateTime eventDate;
private int eventStartTime;
private int eventEndTime;
private string eventAddress;
private int eventNumOfGuests;
public Event(string ineventDescription, DateTime ineventDate, int ineventStartTime,
int ineventEndTime, string ineventAddress, int ineventNumOfGuests,
string ineventContactName, string ineventContactEmail, int ineventContactPhone,
int ineventContactMobile, int ineventCost, int ineventNumOfAttractions)
{
eventDescription = ineventDescription;
eventDate = ineventDate;
eventStartTime = ineventStartTime;
eventEndTime = ineventEndTime;
eventAddress = ineventAddress;
eventNumOfGuests = ineventNumOfGuests;
//eventContactName = ineventContactName;
//eventContactEmail = ineventContactEmail;
//eventContactPhone = ineventContactPhone;
//eventContactMobile = ineventContactMobile;
//eventCost = ineventCost;
//eventNumOfAttractions = 0;
//eventAttractions = new ArrayList(); //empty list for new object
}
}
调试器显示正在调用的构造函数，以及相应的值调用后的实例属性。
从逻辑上讲，它必须是你的实例创建的代码：
And the debugger showed the constructor being called, and the appropriate values in the instance properties after the call.
So logically, it must be the code around your instance creation:
if (Utilities.fileOpenForReadOK(theFile, ref inEvents))
{
...
while (anyMoreEvents == true)
{
...
tempEvent = new Event(eventData[0], Convert.ToDateTime(eventData[1]),
所以从调试器开始，断点高于 if 并确切地看到发生了什么 - 几乎可以肯定你没有进入构造函数只是因为围绕它的代码没有创建instanc es。
如果你到达构造函数，然后进入它 - 并确保你到达正确的位置。如果你可以;不介入，或者你得到奇怪的地方，你需要开始查看Event类的位置：如果它在不同的程序集中，那么你可能会引用一个旧版本。
So start with the debugger and a breakpoint above the if and see exactly what happens - almost certainly you aren't getting into the constructor simply because the code round it isn't creating instances.
If you do get to the constructor, then set into it - and make sure that you get to the right place. If you can;'t step in, or you get somewhere odd, you need to start looking at where the Event class is: if it's in a different assembly then you may be referencing an old version for example.
这篇关于不调用构造函数方法的类的新实例。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
