Loop through Checkbox List using Lambda Expressions

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I have a list of checkbox list items. How do I use lambda expressions to loop through these and get their text attributes read into a string builder object?

HTML

<asp:CheckBoxList ID="CountryList" runat="server" RepeatDirection="Vertical">
<asp:ListItem Text="Australia" Value="AU" />
<asp:ListItem Text="Belgium" Value="BG" />
<asp:ListItem Text="Canada" Value="CA" />
<asp:ListItem Text="France" Value="FR" />
</asp:CheckBoxList>

thanks in advance

Posted 23-Feb-12 17:40pm

sunainanz

Updated 23-Feb-12 20:47pm

Sander Rossel

v2

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Comments

Nikhil_S 23-Feb-12 23:52pm

please be specific with the Requirements and Explain why you are using Lambda Expressions ?

sunainanz 24-Feb-12 0:05am

I just would like to find a new way to do this, instead of using the regular foreach loop. thanks.

3 solutions

Solution 1

look man this is the best way to get the text of the list items

C#

List<ListItem> lst = new List<ListItem>();
foreach (ListItem item in CountryList.Items)
{
   lst.Add(item);
}

and lambda exepression used as this:

C#

ListItem itm = lst.First(p => p.Text == "blablabla");

Posted 23-Feb-12 20:34pm

youssef_123

Updated 23-Feb-12 20:49pm

v2

Comments

youssef_123 24-Feb-12 2:35am

lambda exepression used as this:
ListItem itm = lst.First(p => p.Text == "blablabla");

Solution 2

You mean something like this?

C#

StringBuilder sbWithOneItemTextPerLine = new StringBuilder();           
CheckBoxList.Items.ForEach(item => sbWithOneItemTextPerLine.AppendLine(item.Text);

Of course, only syntactic sugar - I wouldn't see fit to do it like this - you didn't explain you requirements...

Posted 23-Feb-12 22:44pm

johannesnestler

Comments

sunainanz 26-Feb-12 19:33pm

thanks, yes something like this. to add some elegance to code - that is all. This code however misses something. I cant find ForEach method or 'item' in C# version 4 that i am using. Does the code needs anything extra?

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sunainanz · Accepted Answer · 2012-02-27T15:04:00

Solution 3

This works!

XML

var p = (from item in CountryList.Items.Cast<ListItem>()
                     where item.Selected
                     select item).ToArray();

sb.AppendFormat("<strong>Countries selected:</strong> {0}<br />", String.Join(", ", p.ToStringArray(false)));

Posted 27-Feb-12 15:04pm

sunainanz