Let's say I have defined a class:

    public class TestClass
    {
        int m_ID;
        string m_UserTitle;

        public TestClass(int ID, string UserTitle)
        {
            m_ID = ID;
            m_UserTitle = UserTitle;
        }

        public int ID
        {
            get
            {
                return (m_ID);
            }
        }
        public string UserTitle
        {
            get
            {
                return (m_UserTitle);
            }
        }
    }


Now I want to display it using an ObjectList, so I do this on my ASPX page...

<mobile:ObjectList ID="OL" Runat="server" 
    CommandStyle-StyleReference="subcommand" AutoGenerateFields="False" 
    LabelStyle-StyleReference="title">
    <DeviceSpecific>
        <Choice>
            <ItemDetailsTemplate>
                <mobile:Label ID="Label4" Runat="server"><%# Eval("ID") 
%></mobile:Label> 
                <mobile:Label ID="Label2" Runat="server"><%# 
Eval("UserTitle") %></mobile:Label>
                <mobile:Image ID="Image2" Runat="server" 
                    
ImageUrl="http://www.asp.net/App_Themes/Standard/i/logo.png"></mobile:Image>
            </ItemDetailsTemplate>
        </Choice>
    </DeviceSpecific>
</mobile:ObjectList>


NOW, back in my page code, I do this...

private void DisplayList()
{

    List<TestClass> L = new List<TestClass>();

    L.Add(new TestClass(1, "UserTitle 1"));
    L.Add(new TestClass(2, "UserTitle 2"));
    
    OL.DataSource = L;
    OL.DataBind(); //RUNTIME ERROR HAPPENS HERE!
}

Note that I am trying to configure this control to only have one template 
which will be very VERY simple and should work for all devices.

When I have done all this, I get a runtime error on the DataBind() line as 
follows...

System.Exception was unhandled by user code
  Message="Must have one or more fields to databind.
  (Application may have autogenerated fields from an empty DataSource.  To 
clear items, set DataSource to null.)"


Any ideas what I'm doign wrong here?

Thanks!

Alex

Hi Alex,

Seems this is a continual post from a former thread discussing on "Mobile 
Repeater", correct?

I've performed test through the code you provided and did met the error you 
said. After some research, I found that the error is caused by no data 
fields are defined in the ObjectList control. Actually, if you turn off 
"AutoGenerateFields" in ObjectList, you need to supply the fields you want 
to use in your ObjectList. You should use the <Field > element to add 
fields definition into the ObjectList. 

For your "TestClass" scenario, here is the expected ObjectList aspx 
template:

================
        <mobile:ObjectList ID="ObjectList1" Runat="server" 
CommandStyle-StyleReference="subcommand"
            LabelStyle-StyleReference="title" AutoGenerateFields="False" 
LabelField="UserTitle"   >
           
          <DeviceSpecific ID="ds_ol1" Runat="server">
          
          <Choice  >
              
            
          
             <ItemDetailsTemplate>
           detail template: 
          <mobile:Label ID="Label1" Runat="server"><%# Eval("ID") 
%></mobile:Label> 
           <mobile:Label ID="Label2" Runat="server"><%# Eval("UserTitle") 
%></mobile:Label> 
              
            </ItemDetailsTemplate>
     
          </Choice>
          
          </DeviceSpecific>  
          
          
          <Field Title="ID" DataField="ID" />
          <Field Title="UserTitle" DataField="UserTitle" />
        </mobile:ObjectList>
========================

Also, I found a good web forum thread which has included some advanced 
setting and usage upon ObjectList  control, you can also have a look if you 
need some further customzation or event handling:

http://forums.asp.net/p/1146753/1862202.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

 

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