gridview with arraylist not showing data

Question

I have a gridview that I populate with values I get from a powershell command. For example my powershell command is get-command. I know the command returns the values. Here is my code however my gridview never shows the data.

ArrayList boxesarray = new ArrayList();

foreach (PSObject ps in commandResults)
    boxesarray.Add(ps.Properties["Name"].Value.ToString());

boxes.DataSource = boxesarray;
boxes.DataBind();

I know the value is there because I replaced the last two lines with a label and was able to see the value.

boxlabel.text = boxesarray[4];

I must be missing something. Help please.

Can you post the GridView code?

Chopin
– Chopin

2012-05-14 01:25:01 +00:00
Commented May 14, 2012 at 1:25 — Chopin
– Chopin, Commented May 14, 2012 at 1:25
<asp:GridView ID="boxes" runat="server"> </asp:GridView>

user541597
– user541597

2012-05-14 02:19:22 +00:00
Commented May 14, 2012 at 2:19 — user541597
– user541597, Commented May 14, 2012 at 2:19
might want to add tags for asp.net and webforms?

James Manning
– James Manning

2012-05-14 02:30:07 +00:00
Commented May 14, 2012 at 2:30 — James Manning
– James Manning, Commented May 14, 2012 at 2:30

JotaBe · Accepted Answer · 2013-03-01 09:20:51Z

1

The GridView requires a collection or IEnumerable of classes which have properties, and the properties are mapped to columns.

An array like yours have value typed objects (strings) which has no roperties, so you can't bind the properties to the columns.

ArrayList boxesarray = new ArrayList();

You could create a simple class like this:

public class PropertyContainer
{
    public string Value {get;set;}
}
// NOTE: you can override ToString(); to customize String.Format behaviour
// and to show it in the debugger (althought there's other way for this, using
// DebuggerDisplayAttribute)

And create and populate an array of this class, which will be correctly bound to the datagrid.

foreach (PSObject ps in commandResults)
    boxesarray.Add(
       new PropertyContainer { Value = ps.Properties["Name"].Value.ToString()});

boxes.DataSource = boxesarray;
boxes.DataBind();

Other option is to convert your array to an array of objects using LINQ. You can even use anonymous object if the data grid columns are set to be automatically created.

// anonymous type
var dataForBinding = boxesArray.select(val => new {Value = val});

// array of the class
var dataForBinding = boxesArray.select(val => new PropertyContainer
   { Value = val });

You can bind this data to your gridview, and it will work perfectly.

edited Mar 1, 2013 at 9:20

answered May 14, 2012 at 1:29

JotaBe

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1 Comment

user541597 Over a year ago

how exactly would I use the first option?

shenhengbin · Accepted Answer · 2012-05-14 01:28:01Z

0

You can try

.DataSource = (from ps in commandResults 
               select { Name:ps.Properties["Name"].Value.ToString() }).ToList();

Or

.DataSource = (from name in yourarraylist
               select { Name:name.ToString() }).ToList();

answered May 14, 2012 at 1:28

shenhengbin

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