How can you databind a single object in .NET?
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09-06-2019 - |
Question
I would like to use a component that exposes the datasource property, but instead of supplying the datasource with whole list of objects, I would like to use only simple object. Is there any way to do this ?
The mentioned component is DevExpress.XtraDataLayout.DataLayoutControl - this is fairly irrelevant to the question though.
Solution
Databinding expects an IEnumerable object, because it enumorates over it just like a foreach loop does.
So to do this, just wrap your single object in an IEnumerable.
Even this would work:
DataBindObject.DataSource = new List<YourObject>().Add(YourObjectInstance);
OTHER TIPS
In ASP.NET2.0 you can use the generic collections to make this single object a list of only one object in it that you can databind to any server control using the objectdatasource, e.g.
List<clsScannedDriverLicense> DriverLicenses = new
List<clsScannedDriverLicense>();
//this creates a generic collection for you that you can return from
//your BLL to the ObjectDataSource
DriverLicenses.Add(TheOneObjectThatYouHaveofType_c lsDriverLicense);
Then your ObjectDataSource would look like that:
<asp:ObjectDataSource ID="odsDL" runat="server"
SelectMethod="OrdersByCustomer"
TypeName="YourBLL.UtiltiesClassName"
DataObjectTypeName="clsScannedDriverLicense">
</asp:ObjectDataSource>
I don't think you have much choice other than using an class that implements IEnumerable<T>. Even if the DataSource property was smart enough to take a scalar object, it would probably convert it internally to a vector.
I would however consider using a simple array rather than a List<T> as this will result in fewer memory allocations. If you don't like the array syntax (and also to increase readability) you could use a helper method:
T[] DataSourceHelper::ToVector(T scalar) { return new T[] { scalar }; }
I'm after the same thing you are. I've posted a new question Two-way databinding of a custom templated asp.net control that has a bit of a lead. See what you can make of it...
Using this in my formView:
databoundControl.DataSource = new [] { singleObject };
databoundControl.DataBind();