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Returning multiple arrays from function Messages   Related Types This message was discovered on microsoft.public.dotnet.languages.vb. Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions. Post a new message to this list... mark (VIP) I have a class with a function which need to return to the caller three two-dimensional arrays. Right now the function sends the arrays as an array of arrays. The caller then decomposes the array of arrays back to its constituent arrays. The trouble is I plan to make this class a class library which may be consummed by CLS-compliant code. I understand that the new VB.NET array of arrays feature is not CLS-compliant. The arrays can be very large and I would like to avoid giving them class level scope. Does anyone have a CLS-compliant technique for sending three arrays with procedure level scope from a function to a caller. -- mark Reply to this message...        Cor Ligthert Mark, Why not use an arraylistArray as return type Private function myfunction (byval wathever as whatever) as arraylist() Cor Reply to this message...        Tom Shouldn't you be able to return them as 3 By Ref arguments in the function call? [Original message clipped] Reply to this message...        Tom Shelton In article <Click here to reveal e-mail address>, mark wrote: [Original message clipped] I would just pass the arrays byref... Sub MySub (ByRef array1(,) As Whatever, ByRef array2 (,) As Whatever.... HTH -- Tom Shelton [MVP] Reply to this message...        mark (VIP) Yes Tom that's a way I may have to go. But, I would like to avoid it because the arrays would have class level scope, i.e. they would continue to exist (using memory) after their useful lifetime. "Tom Shelton" wrote: [Original message clipped] Reply to this message...        Tom Shelton In article <Click here to reveal e-mail address>, mark wrote: [Original message clipped] Why? sub stuff() dim array1(100, 100) as whatever dim array2(1, 1) as whatever dim array3(2, 1) as whatever myobject.mysub (array1, array2, array3) ' do stuff with the arrays end sub I fail to see how passing the arrays to be filled makes them live past their usefull lifetime? -- Tom Shelton [MVP] Reply to this message...        mark (VIP) OK, I see now. The instance of my class will call its own method to populate arrays which are themselves class properties ! "Tom Shelton" wrote: [Original message clipped] Reply to this message...        Herfried K. Wagner [MVP] (VIP) * "=?Utf-8?B?bWFyaw==?=" <Click here to reveal e-mail address> scripsit: [Original message clipped] This is not a VB.NET issue, it applies to all .NET programming languages. The CLS simply doesn't support jagged arrays because there may be programming languages that cannot deal with them. -- M S Herfried K. Wagner M V P <URL:http://dotnet.mvps.org/> V B <URL:http://dotnet.mvps.org/dotnet/faqs/> Reply to this message...        mark (VIP) OK, Same question though. Is there another way to send three 2-D arrays from a function which is CLS compliant but does not require those arrays to be declared at class level? "Herfried K. Wagner [MVP]" wrote: [Original message clipped] Reply to this message...        Herfried K. Wagner [MVP] (VIP) * "=?Utf-8?B?bWFyaw==?=" <Click here to reveal e-mail address> scripsit: [Original message clipped] It doesn't make a difference where the array is declared. Jagged arrays per-se are not CLS compliant. You'll have to look for another datastructure, a list of lists for example ('ArrayList' or a typed list). -- M S Herfried K. Wagner M V P <URL:http://dotnet.mvps.org/> V B <URL:http://dotnet.mvps.org/dotnet/faqs/> Reply to this message...        mark (VIP) This array list sounds like a good solution. I assume I declare an instance of arraylist then use the add method to enter my 2-D arrays in my function then return the arraylist. Can 2-D arrays be added to an arraylist? In the caller, what method do I use to access the arrays in the list? Finally, does it matter what scope the arrays have in the sender's class? "Herfried K. Wagner [MVP]" wrote: [Original message clipped] Reply to this message...        Herfried K. Wagner [MVP] (VIP) * "=?Utf-8?B?bWFyaw==?=" <Click here to reveal e-mail address> scripsit: [Original message clipped] Yes. > In the caller, what method do I use to access the arrays in the list? \\\ Dim Result As ArrayList = Foo.DoSomething() For Each Row As ArrayList In Result.Items For Each Item As ... In Row ... Next Item Next Row /// > Finally, does it matter what scope the arrays have in the sender's class? No. You only need to return a reference to the arraylist. -- M S Herfried K. Wagner M V P <URL:http://dotnet.mvps.org/> V B <URL:http://dotnet.mvps.org/dotnet/faqs/> Reply to this message...        Charles Law Hi Mark If these arrays have some common theme (if only that they are all returned by the same function) you could encapsulate them in a class. The you can return just one object, and control exactly what happens to them and what their scope is. HTH Charles "mark" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...     System.Collections.ArrayList Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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