Question

Removing items from a Generic List

Asked by: CLoucas

I have developed an "Incident" object that has a generic list as a member (List<Alert>), where Alert is a business logic class.

In manipulating the alerts that an Incident will have I am databinding a GridView control onto the List<Alerts> collection and display them.  The user would like to select one of those and remove them from the collection.

My question is how to remove the selected alert from the Alerts collection.

Regards

Chris

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Asked On
2008-09-01 at 03:26:34ID23693337
Tags

asp.net, c#

Topics

.Net Editors & IDEs

,

Programming for ASP.NET

,

Microsoft Visual C#.Net

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: DreamMasterPosted on 2008-09-02 at 03:51:58ID: 22365917

As far as I know you can do that using remove..

For more information, check this page.

http://en.csharp-online.net/Understanding_Generics%E2%80%94Examining_the_List(T)_Type

Regards,
Max.

 

by: alex_pavenPosted on 2008-09-03 at 05:22:34ID: 22376370

Use either of two flavors of .Remove:

1. Remove by index; get the selected index of the GridView with GridView.SelectedIndex and pass that index to List.Remove(int index).

2. Remove by reference; you can get the selected object in the gridview since you're binding directly, and pass that to List.Remove<Alert>(Alert object).

 

by: alex_pavenPosted on 2008-09-03 at 05:24:06ID: 22376384

Sorry, I missed the ASP tag; in ASP it's a bit harder to use the second method, since you need to first set the DataKeys for the GridView, in order to get the selected object's DataKey and infer which object that is from there. By far, the first method is preferred.

 

by: CLoucasPosted on 2008-09-03 at 12:21:38ID: 31492043

I have solved the problem before this post by doing exactly what is suggested here.  Although I wasn't sure whether the order appearing in the gridview and thus the gridview index would be the same as the collection index, it appears to be so; looks like the gridview is binding the rows in their order in the collection.

Excellent.

20120131-EE-VQP-002

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