ASP.NET Cast ArrayList of objects to custom Objects

Question

Hey Just getting the following error

Unable to cast object of type 'System.Object[]' to type 'OrderService.webdirect_WebLinesRow[]'.

On the line

webdirect(web_companyID, web_locationCode, web_customerNumber, web_orderNumber, web_orderReference, web_orderDate, webLinesArray.ToArray(), o_Company, o_LocationCode, o_CustomerNumber, o_OrderNumber, o_OrderStatus, o_OrdDescrip, webRespArray)

I created the webLinesArray.ToArray() array as such

Dim webLinesArray As New ArrayList()

Am I missing an additional cast or something ?

sll · Accepted Answer · 2011-08-09 14:57:06Z

2

Try out using System.Linq:

webLinesArray.Cast(of WebLinesRow)().ToArray()

instead of

webLinesArray.ToArray()

BTW,

why are you using legacy ArrayList? Try out generic List<T>

edited Aug 9, 2011 at 14:57

answered Aug 9, 2011 at 14:42

sll

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5 Comments

Matthieu Over a year ago

@StevieB : linq is supported in vs2008 / .net framework 3.5. It is a standalone library that has no dependency on (asp.net ???) mvc.

StevieB Over a year ago

yeah I tried webLinesArray.Cast<WebLinesRow>().ToArray() but getting error Cast is not a member of System.Collections.ArrayList

StevieB Over a year ago

Cool tried that but now getting Error 6 Type parameter 'TResult' for extension method 'Public Function Cast(Of TResult)() As System.Collections.Generic.IEnumerable(Of TResult)' defined in 'System.Linq.Enumerable' cannot be inferred.

Ahmad Mageed Over a year ago

It's VB.NET so using should be Imports System.Linq and the cast should be webLinesArray.Cast(Of WebLinesRow)().

Dan Abramov Over a year ago

@Steve: drop ArrayList, it's not used anymore.

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