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.NET Forum / Languages / C# / March 2008Dynamically changing Variable name
Hello, I have ArrayLists that are Channel1, Channel 2......Channel16 I want to access them with a (for int s=1;s<17;s++) loop, but I dont know how to do this: "Channel+s" Any help, Thanks Mike > I have ArrayLists that are Channel1, Channel 2......Channel16 > I want to access them with a (for int s=1;s<17;s++) loop, but I dont > know how to do this: > "Channel+s" You shold almost certainly be using an array, a list or a dictionary instead. Why do you feel you *want* to have 16 different variables rather than one? Jon > Hello, > I have ArrayLists that are Channel1, Channel 2......Channel16 [quoted text clipped - 4 lines] > Thanks > Mike Variable names are not known at run time. That is a basic principle of compiled programming languages. (In a language with reflection, such as C#, it may be possible to retrieve a variable name, but not to change it.) What you want is an array of ArrayLists: Channel[0][...etc...], Channel[1][...etc...], and so on. > > Hello, > > I have ArrayLists that are Channel1, Channel 2......Channel16 [quoted text clipped - 11 lines] > What you want is an array of ArrayLists: Channel[0][...etc...], > Channel[1][...etc...], and so on. Actually the data started out as Arrays and I am finding ArrayLists allow me to clean the data easier. I have 12 boards with 16 channels on each board.The amount of data changes between channels and boards. I should still be able to use some kind of "for statenent to do my cleansing on a "Channel+i" basis. Right? Thanks Mike <snip> > > What you want is an array of ArrayLists: Channel[0][...etc...], > > Channel[1][...etc...], and so on. [quoted text clipped - 5 lines] > I should still be able to use some kind of "for statenent to do my > cleansing on a "Channel+i" basis. To be honest, it sounds like you need Board type - and then a list of boards. Any time you end up with something 2-dimensional (or appearing to be) it's worth considering whether an extra bit of encapsulation would help.  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 > <snip> > [quoted text clipped - 16 lines] > Jon Skeet - <sk...@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 So, I am taking your advise and now that I cleaned the data I want to put it back into an Array from Array list. But the Array is going to be 2 dimentional: int[][] BoardChannel = new int[16][]; I want to pu each of the 16 Channel ArrayLists into it. HELP. Thanks Mike <snip> > I am taking your advise and now that I cleaned the data I want to put > it back into an Array from Array list. > But the Array is going to be 2 dimentional: > int[][] BoardChannel = new int[16][]; > I want to pu each of the 16 Channel ArrayLists into it. > HELP. If you are taking my advice, you won't have 16 channel ArrayLists. You'll have a single ArrayList populated with Boards. I'm afraid you'll need to clarify what exactly you want to achieve - it's not very clear at the moment. 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 > <snip> > [quoted text clipped - 14 lines] > Jon Skeet - <sk...@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 What I have is data that goes through a number of functions to clean and rearrange the data. This is for a physics experiment. The Arraylist is a great way to keep the array size to a minimal automatically as I work on it. But after I have all 16 channels cleaned I want to put them back into an Array to graph them. Does this help? Thanks Mike <snip> > What I have is data that goes through a number of functions to clean > and rearrange the data. This is for a physics experiment. [quoted text clipped - 3 lines] > an Array to graph them. > Does this help? Not really, I'm afraid. Why do you need them in an Array? Does your graphing library (or whatever) really not accept other collections? However, if you have to, I'd add a method to your Board class - something like: public int[] ToArray() { ... } Then potentially call ToArray on each board, building up an ArrayList of int[]s, then call ToArray on *that* ArrayList. (Are you stuck with .NET 1.1, by the way? It would be neater with List<T> in in .NET 2.0. With .NET 3.5 you could quite possibly do it all *really* nicely with LINQ, and then automatically parallelise it...) 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 >> "AMP" <ampel...@gmail.com> wrote in message >> [quoted text clipped - 3 lines] > Actually the data started out as Arrays and I am finding ArrayLists > allow me to clean the data easier. I think you missed that AMP wrote "an array of ArrayLists." If you wanted, though, you could also have "an ArrayList of ArrayLists." 1. Create a new ArrayList called Temp 2. Add Channel1 to it, add Channel2 to it, .... 3. Do a loop on Temp, processing each channel in turn 4. Toss Temp, unless you want to keep it
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