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.NET Forum / Languages / VB.NET / November 20062 dimensional array question
I need to store information in a 2 dimensional array. I understand ArrayList only works for a single dimensional array, is that correct ? So, I use the 2 dimensional array like in VB6. I pass the array into a subroutine, and inside it I "Redim Preserve" the array to increase the number of item in the array. I got the error "Redim statement requires an array", but arr is an array. HOw can I fix this problem ? Or, how can I do ArrayList for 2 dimensional array ? THank you very much. Private arr(COM_MAX, 0) As String LoadArr(arr) Sub LoadArr(ByRef arr As Array) lNumComm = 0 For x = 1 to 1000 ReDim Preserve arr(COM_MAX, lNumComm)--->Redim statement requires an array next >I need to store information in a 2 dimensional array. I understand >ArrayList only works for a single dimensional array, is that correct ? [quoted text clipped - 9 lines] > > Sub LoadArr(ByRef arr As Array) Pass it in the same way you define the array, eg > Sub LoadArr(ByRef arr As int(,)) BTW, redim preserve does a complete copy of every element in the array every time it's called. In your loop that will mean half a million copies for each column. Michael Michael C is right about the Redim Preserve. I wouldn't do that. I'd use an arraylist or a generic list (depending on what version of .Net you're using.) Robin S. --------------------------------- >>I need to store information in a 2 dimensional array. I understand >>ArrayList only works for a single dimensional array, is that correct ? [quoted text clipped - 19 lines] > > Michael > Michael C is right about the Redim Preserve. I wouldn't do that. > I'd use an arraylist or a generic list (depending on what version > of .Net you're using.) Or redim at the start or redim at set intervals. Michael why not have an Arraylist (or preferably a generic List(of T)) of Arraylists? guy > I need to store information in a 2 dimensional array. I understand ArrayList > only works for a single dimensional array, is that correct ? [quoted text clipped - 14 lines] > : > next Thank you everybody. I would like to use ArrayList, but it does not work with 2 dimensional array, does it ? How can I have a 2 dimensional array ArrayList ? > why not have an Arraylist (or preferably a generic List(of T)) of > Arraylists? [quoted text clipped - 22 lines] >> : >> next > Thank you everybody. > I would like to use ArrayList, but it does not work with 2 dimensional > array, does it ? > How can I have a 2 dimensional array ArrayList ? You can put an array into each element of the arraylist I guess. Although there is nothing wrong with using Redim Preserve if you limit it's use by increasing the size of the array, say, every 1000 elements. Michael 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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