Question

Greetings!

I’m creating a User Control that will display data in a GridView control. We are using n-tier architecture and the data in question is retrieved from our database and returned to us as a ReadOnlyCollection. OurNewObject is a class containing several properties and an empty constructor that takes no parameters – it’s in the following namespace: Acme.ObjectModel.

In the user control, I have the following:

<asp:GridView ID='ourGrid' runat='server' DataSourceID='ourDataSource'>     <columns>     <asp:BoundField DataField='Name' HeaderText='Full Name' />     <asp:BoundField DataField='Gender' HeaderText='Gender' />     <asp:BoundField DataField='BirthYear' HeaderText='Year of Birth' />     <asp:BoundField DataField='JoinDate' HeaderText='Date Joined' />   </columns> </asp:GridView> <asp:ObjectDataSource ID='ourDataSource' runat='server' SelectMethod='GetTopUsers' TypeName='Acme.Model.OurNewObject'> </asp:ObjectDataSource> 

In the User Control’s code behind, I have the following public method:

public ReadOnlyCollection<OurNewObject> GetTopUsers() {     return (OurDataProxy.GetJustTheTopUsers()); } 

When I place the User Control on a Web form and run it, I get the following message:

ObjectDataSource ‘ourDataSource’ could not find a non-generic method ‘GetTopUsers’ that has no parameters.

So my questions are:

1. Am I using the ObjectDataSource incorrectly?
2. Is there a more proper way to use the ObjectDataSource in this situation?

Thanks.

Answer 1

I believe the issue is missing two attributes.

First on your GetTopUsers() Method add this attribute

[System.ComponentModel.DataObjectMethodAttribute     (System.ComponentModel.DataObjectMethodType.Select, true)] 

Then on the actual OurNewObject class add this attribute

[System.ComponentModel.DataObject]