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Old February 10th, 2008, 08:20 PM
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Default ArrayList Filtering


I am using Vb.net m ASP.net...

I have an ArrayList that contains a list of items that actually appear in the DDL as shown in the code bellow:

1 Dim list As ArrayList
2 list = New ArrayList
3 DDL.DataTextField = "Title"
4 DDL.DataValueField = "BlogID"
5 DDL.DataSource = list
6 DDL.DataBind()

What i am trying to do is to perform filtering on the Arraylist Such that all the Titles that start from letter A will be copied from original ArrayList "list" to new ArrayList "listA ", similarly all Titles that start from letter B will be copied into the ArraList listB and so on...But I also want to maintain the original ArrayList "list" for future use.

Any code will be really appreciated.

Many Thanks in advance...


Old February 11th, 2008, 01:23 PM
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What is your ultimate goal? Are you looking to provide a DDL that shows A thru Z and then based on the selection, shows another with just those that begin with the chosen letter?

You can filter an array using the FindAll<T> generic method of the System.Array class. You create a test method either explicitly or as an anonymous method that tests the object for the desired condition. Look at the method MSDN page for an example that's very similar to what you want to test for.

Old February 11th, 2008, 03:30 PM
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Thanks for the reply..

Well I want links from A - Z on top of the DDL , it will work like if user select A the DDL will load all the Titles start with the letter A....

Any code will be really appreciated..

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