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.NET Forum / ASP.NET / General / June 2007C# - auto-creating variables
hey all. Im building a webapp that writes data to a DB. But I dont know how many fields the user will add so I need to know how can I reference infinite variables like: var1, var2, var3, ..... var300 . The numbers are sequential. What I want is, to use a variable to store the field number (lets say intFields) and do something like this on the script: var + intFields = somevalue ; //Of course this wont work... What is the syntax in C# for that ? Or maybe what is the best way to do it ? Thx. Would an arraylist work for you? I tried using arrays... but it fails, saying that im using an Unassigned Variable: its like: string[] strString; int x=1; for(.......){ strString[x] = ....... ; } It says strString is unassigned, if I remove the [x] it says "missing identifier"... But if the array worked, it would be perfect. Thx. > Would an arraylist work for you? > I tried using arrays... but it fails, saying that im using an > Unassigned Variable: [quoted text clipped - 11 lines] > > But if the array worked, it would be perfect. You need an ArrayList as it's dynamic, with an ArrayList you can add as many items as you want (an array is of fixed length). Use the Add method to add a new entry into the AL and you will end up with a complete list of field entries. HTH Kev > I tried using arrays... but it fails, saying that im using an > Unassigned Variable: [quoted text clipped - 11 lines] > > But if the array worked, it would be perfect. Sounds like all you need is a generic e.g. List<string> MyList = new List<string>(); MyList.Add("One"); MyList.Add("Two"); MyList.Add("Three"); etc Or if you need keys and values, consider a Dictionary<string, string> generic...  Signaturehttp://www.markrae.net > I tried using arrays... but it fails, saying that im using an > Unassigned Variable: [quoted text clipped - 12 lines] > > But if the array worked, it would be perfect. Some of the others have mentioned this, but I meant ArrayList, not an array. Also, depending on what version of .NET you are in, you could use generics as discussed below too - although I'm new into that version of .NET and don't know a lot about them. you guys really helped me here... Im using the arraylist, its simple and the code is almost done. thx again. Hi, > you guys really helped me here... Im using the arraylist, its simple > and the code is almost done. > > thx again. Using List<> instead of ArrayList is usually a good idea, unless you have to code against .NET 1.1. ArrayList contains Objects only, so you need to cast to the desired type (in that case, string) every time. List<> is a generic collection, so you don't need to cast the elements. List<string> myList = new List<string>(); myList.Add(...); HTH, Laurent SignatureLaurent Bugnion [MVP ASP.NET] Software engineering, Blog: http://www.galasoft.ch PhotoAlbum: http://www.galasoft.ch/pictures Support children in Calcutta: http://www.calcutta-espoir.ch A (2.0) Dictionary < string , MyClass > or Dictionary < int , MyClass > are options as well. > Hi, > [quoted text clipped - 13 lines] > HTH, > Laurent Hi, > A (2.0) Dictionary < string , MyClass > > or > Dictionary < int , MyClass > > are options as well. The OP wants a dynamic array of Strings. I don't see the need to use a Dictionary for this, to be honest. Dictionaries as well as Hashtables have a hit on performances, compared to non-keyed collections. HTH, Laurent SignatureLaurent Bugnion [MVP ASP.NET] Software engineering, Blog: http://www.galasoft.ch PhotoAlbum: http://www.galasoft.ch/pictures Support children in Calcutta: http://www.calcutta-espoir.ch Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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