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GeneralRe: Design Question Pin
BobJanova16-Nov-12 0:09
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QuestionArray, Struct, Class??? I'm so confused.... Pin
KKW_acd15-Nov-12 6:29
memberKKW_acd15-Nov-12 6:29 
AnswerRe: Array, Struct, Class??? I'm so confused.... Pin
DaveyM6915-Nov-12 6:55
mentorDaveyM6915-Nov-12 6:55 
KKW_acd wrote:
righthand side of the line

You are correct. As the message says, you cannot initialize a field when it is first declared in a struct, all fields assume the default value for the type which in the case of an array is null. Initialization must be done in a constructor (however you cannot have a parameterless constructor for a struct either).

When to use a struct or a class can be complicated sometimes. I think your dtlst (horrible name by the way - why not DataList?) should most likely be a class. You will then be able to initialize the field as you wish.

Also, public fields are normally bad practice, make them private and use a property (getter only unless a setter is needed) to expose the field.

Edit: There's still a few things about this that don't feel right, but to fit your code and usage, this is a quick example of something that works. This is not meant to be doing your homework for you, but rather to point you in the correct direction and give you something to compare your code too:
public struct Item
{
    private string name;
    private int index;
 
    public Item(string name, int index)
    {
        this.name = name;
        this.index = index;
    }
 
    // only getters as a struct should not normally be changed once created.
    public string Name { get { return name; } }
    public int Index { get { return index; } }
}

public class DataList
{
    private Item[] items = new Item[128];
 
    public Item[] Items { get { return items; } }
}

// usage
DataList[] dataLists = new DataList[128];
 
int listIndex = 0;
int itemIndex = 0;
 
string itemText = "Random text";
string indexText = "1";
 
dataLists[listIndex] = new DataList();
 
dataLists[listIndex].Items[itemIndex] = new Item(itemText, int.Parse(indexText));

Dave

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Please take your VB.NET out of our nice case sensitive forum.
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BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)




modified 15-Nov-12 13:19pm.

GeneralRe: Array, Struct, Class??? I'm so confused.... Pin
KKW_acd15-Nov-12 9:03
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AnswerRe: Array, Struct, Class??? I'm so confused.... Pin
DaveyM6915-Nov-12 19:02
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GeneralRe: Array, Struct, Class??? I'm so confused.... Pin
Richard MacCutchan16-Nov-12 0:02
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AnswerRe: Array, Struct, Class??? I'm so confused.... Pin
Richard MacCutchan15-Nov-12 7:06
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AnswerRe: Array, Struct, Class??? I'm so confused.... Pin
BobJanova16-Nov-12 0:16
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QuestionWind Chill Automation with C# application Pin
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QuestionAccess mainform while subform is updating Pin
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QuestionGet integer variable from datalist textbox for entry into SQL Pin
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