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.NET Forum / Languages / C# / March 2008arraylist
Hi, hopefully Ill explain my question ok. Im using an arraylist to get an an array of values from an application, which allows me to use a com interface to interact with its functions. I have no access to the code. I use prices.Add(ba.getPrices());, prices bieng my arraylist. It returns 1 element, which has 6 dimensions. I think thats the wording. So within prices[0] there is 6 dimensions, 0 to 5. When I use prices.count it returns 1, how do I get the count of the dimensions. Regards Robert > Hi, hopefully Ill explain my question ok. Im using an arraylist to get > an an array of values from an application, which allows me to use a [quoted text clipped - 4 lines] > prices.count it returns 1, how do I get the count of the dimensions. > Regards Robert Some actual sample code would be useful here. It's not really clear what you're trying to do. But it's possible that instead of the Add() method, you really want the AddRange() method. That is, you want the ArrayList to have 6 elements if the array returned by "ba.getPrices()" itself has 6 elements. On the other hand, if you really want to use Add(), that means that your ArrayList is eventually going to contain multiple instances of the array returned by "ba.getPrices()". If so, then what you want is to get the element from the "prices" array (e.g. "prices[0]") and cast that to the appropriate array type, and then look at the Length property of that array. That will tell you how many elements are in the array that was returned by "ba.getPrices()" and stored in the "prices" ArrayList. If neither of the above apply to your use of the ArrayList I think it's likely you're misusing the ArrayList. Again, a code sample would help us to better understand the situation and help you fix it. Pete Thankyou for your reply. Addrange was the one, gives me what I need. Regards Robert Robert, Instead of using ArrayList, i recommend you to develop your own class which is inherited from CollectionBase and implement the .ADD method to it.. so that you dont have to worry about the index.. HTH, Chakravarthy > Hi, hopefully Ill explain my question ok. Im using an arraylist to get > an an array of values from an application, which allows me to use a [quoted text clipped - 4 lines] > prices.count it returns 1, how do I get the count of the dimensions. > Regards Robert Thankyo for your reply. I will read up on CollectionBase. Im still having problems, I can see the elements but cant access them. Regard Robert Im struggling with this. I dont understand why though. If I put a break in my code and look at the prices array I can see 6 element 0 - 5. If I open up [0] I can see a list of values Im trying to get, they dont have[0][1] etc beside them, just there names in a column, eg amount1 100, amount2 200. I thought if I could see them I could ref them as price[0].amount1. Ive tried object 'o = ba.getprices(0)' and prices.AddRange(ba.getPrices()). I can see the details in both but cant get at the details. Im reading up, but Im missing something. Regards Robert > Im struggling with this. I dont understand why though. If I put a > break in my code and look at the prices array I can see 6 element 0 - [quoted text clipped - 4 lines] > prices.AddRange(ba.getPrices()). I can see the details in both but > cant get at the details. Im reading up, but Im missing something. The debugger is showing you the data dynamically - the compiler only knows about *static* typing. However, it would really help if you could show all the code, highlighting the lines which you're confused about - then we can help. Comment out any lines which don't work, but you don't know why.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk > Im struggling with this. I dont understand why though. If I put a > break in my code and look at the prices array I can see 6 element 0 - [quoted text clipped - 4 lines] > prices.AddRange(ba.getPrices()). I can see the details in both but > cant get at the details. Im reading up, but Im missing something. Your post is fairly confusing and vague. However, it sounds like you're failing to cast the object stored in the ArrayList back to whatever type is returned by the "getPrices()" method you mentioned earlier. One fix would be to perform that cast so that you can get at the members of the actual data structure. A much better fix would be to use the List<T> class instead. With that, you use whatever type is being returned by "getPrices()" (well, the base type for the array that's being returned, that is), and then when you reference an element in the List<T>, you already have the correct type. For example, if you've got this: class Price { public decimal amount1 { get; set; } } Price[] getPrices() { ... } Then you can declare a variable: List<Price> prices = new List<Price>(); Add the new prices: prices.AddRange(getPrices()); And access an individual price without casting: prices[0].amount1; Pete
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