Question

How to use LINQ to get selected items (checkboxes) within a GridView control that allow paging?

Asked by: ryancys

I'm exploring the possibility to use LINQ to get selected items (checkboxes) within a GridView control that allow paging.


Checkbox is added like this:

<asp:TemplateField>
                      <ItemTemplate>
                      <asp:CheckBox ID="chk" runat="server" />
                      </ItemTemplate>
                      </asp:TemplateField>


Anyone can advise here? Thanks

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Asked On
2009-05-21 at 21:24:24ID24429991
Tags

LINQ

,

GridView

,

checkboxes

Topics

Programming for ASP.NET

,

Microsoft Visual C#.Net

,

C# Programming Language

Participating Experts
1
Points
499
Comments
4

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Answers

 

by: abelPosted on 2009-05-22 at 13:20:53ID: 24454777

It seems that you want to query all checkboxes within a GridView, from outside the GridView (i.e., not from within any updating event of the checkbox_change event).

Reading your request, I though it wasn't trivial, but it isn't that hard, really. This will give you what you want:

var checkedCheckBoxes = from GridViewRow row in GridView1.Rows 
                        where (row.FindControl("chk") as CheckBox).Checked
                        select row.FindControl("chk");
 
foreach(CheckBox chk in checkedCheckBoxes)
{
    Debug.WriteLine("Text is: " + chk.Text);
}
                                              
1:
2:
3:
4:
5:
6:
7:
8:

Select allOpen in new window

 

by: abelPosted on 2009-05-22 at 13:21:45ID: 24454787

(PS: there's also a LINQ zone, in case you want to make any follow-up questions....;-).

 

by: ryancysPosted on 2009-05-25 at 19:51:34ID: 24469933

Hi there,

Thanks for your codes, have some fun with it, and my final outcome is something like below:

var checkedIDs = from GridViewRow row in GridView1.Rows
                            where (row.FindControl("chk") as CheckBox).Checked
                            select (row.FindControl("id") as HiddenField).Value;


//....

cheers

 

by: abelPosted on 2009-05-26 at 01:54:26ID: 24471254

Looks good. Tx for the grade! ;-)

20120131-EE-VQP-002

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