C# problem with object array

Question

I am fairly new to arrays in C# and am used to storing a mass of data in a string and in INI files and then breaking it down into basic arrays using delimiters...so yeh, my knowledge is almost none existent.

My main form class begin this definition:

public CAirportData[] _AirportData; //size not known

This is the method I am using to create the array:

...string[] airports = possibleAirports.Split(','); //size is known
foreach (string airport in airports)
 {
   string[] rwys = inif.Read(airport, "rwys").Split(':'); //size is known (2)
   _AirportData = new CAirportData[] { new CAirportData() { icao=airport, depRwy=rwys[0], arrRwy=rwys[1] } };
 }

I know this just boils down to my limited knowledge of objects and arrays. But I can't seem to find anything on the internet that uses this sort of thing. I have tried to combine other peoples code with little success.

I need the _AirportData array to be available outside of the form hence public and declared outside of any methods. I supose the main problem is that I am overwriting array and foreach airport I am creating a new array hence loosing the previous. I had tried moving the ..= new CAirportData[] to all sorts of places but Visual Studio doesn't like it.

Below is the class definition for CAirportData:

public class CAirportData
{
    public string icao { get; set; }
    public string depRwy { get; set; }
    public string arrRwy { get; set; }

    public override string ToString()
    {
        string result = string.Format("ICAO: {0}, Dep: {1}, Arr: {2}", this.icao, this.depRwy, this.arrRwy);
        return result;
    }
}

public class CMRunways
{
    public string icao { get; set; }
    public string depRwy { get; set; }
    public string arrRwy { get; set; }
}

Many thanks in advance for any help!

Read the first part. You are declaring an array _AirportData and then each time create new array of one element. In your case you should use Generic contatiners like List<CAirportData> or so. — Alleo
– Alleo, Commented Sep 4, 2011 at 13:39
Read the second. Yes, you are right. Read about List (examples are there too) msdn.microsoft.com/en-us/library/6sh2ey19.aspx . — Alleo
– Alleo, Commented Sep 4, 2011 at 13:42

user447356 · Accepted Answer · 2011-09-04 13:38:36Z

3

What you're looking for is generic List. Change the definition to:

public List<CAirportData> _AirportData = new List<CAirportData>();

Then the code in the loop to:

_AirportData.Add(new CAirportData { icao=airport, depRwy=rwys[0], arrRwy=rwys[1] });

answered Sep 4, 2011 at 13:38

user447356

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3 Comments

jswolf19 Over a year ago

You could also declare the array outside of the loop, since you know the size you want it to be (airports.length)

Compunutter Over a year ago

This is exactly what I was looking for - it works very well. Thank you very much!

user447356 Over a year ago

Cheers Govix, note jswolf19 comment as well, it's directed for you. :)

Saad Imran. · Accepted Answer · 2011-09-04 13:42:51Z

-1

This is what I would do...Create a static class, with a static property (airports) and add a static constructor to load the airports from file at the begining.

 public static class Session
 {
     public static CAirportData[] _AirportData;

     static Session()
     {
         string airports = possibleAirports.Split(",");
         foreach (string airport in airports)
         {
             string[] rwys = inif.Read(airport, "rwys").Split(':'); //size is known (2)
             _AirportData = new CAirportData[] { new CAirportData() { icao=airport, depRwy=rwys[0], arrRwy=rwys[1] } };
         }
     }
 }

Now you can access the array anywhere in the project like

MessageBox.Show(Session.CAirportData[0].depRwy);

answered Sep 4, 2011 at 13:42

Saad Imran.

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1 Comment

jswolf19 Over a year ago

_AirportData still won't contain all the data the OP wants it to.

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