Traversing properties with a datagrid

I have a datagrid that I am binding to a custom collection, and I am
having problems with data binding in an ASP.NET datagrid (1.1
framework).

As a simple example, imagine a class called EmployeeCollection which
inherits CollectionBase, and a class called Employee which is the item
of the collection. Each employee has a manager - also an instance of
the Employee class.

The Employee class has 2 properties

public string Name { get { return this.name; } }

public Employee Manager { get { return this.manager; } }


Now I have created a datagrid with single column, "Employee Name", and
I can successfully bind my collection to it, setting the DataField to
"Name". The problem occurs when I want to add another column "Manager
Name" to the datagrid. If I set the DataField to "Manager.Name" then
it complains that the Manager.Name was not found.

The only workaround for this is to add another property ManagerName to
the Employee class and bind to that as follows:

public string ManagerName { get { return this.Manager.Name; } }


Obviously this is a simplified example - I have many datagrids,
collections, and custom classes, and have ended up adding lots of
methods to retrieve such "sub-properties". This is not ideal.

Is there any way to directly bind the datagrid to Manager's name?
Thanks
Neil

nmosafi@gmail.com

Check out "Binding to Hierarchical Data" section in this article, it might
help you.
http://www.devx.com/dotnet/Article/22024/1954?pf=true

--
Saravana
http://dotnetjunkies.com/WebLog/saravana/
www.ExtremeExperts.com


<> wrote in message
news: ups.com...
> I have a datagrid that I am binding to a custom collection, and I am
> having problems with data binding in an ASP.NET datagrid (1.1
> framework).
>
> As a simple example, imagine a class called EmployeeCollection which
> inherits CollectionBase, and a class called Employee which is the item
> of the collection. Each employee has a manager - also an instance of
> the Employee class.
>
> The Employee class has 2 properties
>
> public string Name { get { return this.name; } }
>
> public Employee Manager { get { return this.manager; } }
>
>
> Now I have created a datagrid with single column, "Employee Name", and
> I can successfully bind my collection to it, setting the DataField to
> "Name". The problem occurs when I want to add another column "Manager
> Name" to the datagrid. If I set the DataField to "Manager.Name" then
> it complains that the Manager.Name was not found.
>
> The only workaround for this is to add another property ManagerName to
> the Employee class and bind to that as follows:
>
> public string ManagerName { get { return this.Manager.Name; } }
>
>
> Obviously this is a simplified example - I have many datagrids,
> collections, and custom classes, and have ended up adding lots of
> methods to retrieve such "sub-properties". This is not ideal.
>
> Is there any way to directly bind the datagrid to Manager's name?
> Thanks
> Neil
>

Saravana

This is talking about when a property is another collection - you can
bind another datagrid to that property and put it within the parent
datagrid.

However it's not clear about what to do when a property is just an
object, and you want to reference another property of that object and
so on...

nmosafi@gmail.com

<> wrote in message
news: oups.com...
> This is talking about when a property is another collection - you can
> bind another datagrid to that property and put it within the parent
> datagrid.
>
> However it's not clear about what to do when a property is just an
> object, and you want to reference another property of that object and
> so on...

Manager.Name is not the name of a field, so it gives you that error.

One workaround would be for you to listen to the Item_DataBound event. In
that event, you can set the value of the column to Manager.Name.

John Saunders

John Saunders

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