Bind Property of Child-Objecty to DataGridView

  • Thread starter Thread starter Pieter
  • Start date Start date
P

Pieter

Hi,

I want to bind a proeprty of a child object to a DataGridView, but it
doesn't work.

For instance:
Imagen that I have an object Company, and this object company has a child
object Address.
Address has a property Street.

Now I want to bind a list oc Company objects to my DataGridView, and show
there Street proeprty.
So you would think you would have to add Address.Street as DataPropertyName
in the DataGridViewTextBoxColumn, but this doesn't show the value...

Does anybody knows how to do this?


Thansk a lot in advance,


Pieter
 
Pieter said:
Hi,

I want to bind a proeprty of a child object to a DataGridView, but it
doesn't work.

For instance:
Imagen that I have an object Company, and this object company has a child
object Address.
Address has a property Street.

Now I want to bind a list oc Company objects to my DataGridView, and show
there Street proeprty.
So you would think you would have to add Address.Street as DataPropertyName
in the DataGridViewTextBoxColumn, but this doesn't show the value...

Does anybody knows how to do this?


Thansk a lot in advance,


Pieter
Click to expand...

Hi, I think you can bind child property in this view but I don't know
how to edit these property (in your problem)
This is the way: use Repeater (or DataList) and template
In your Visual Studo, open web page containning DataGridView (in Code
mode - not Design mode). May be your code like this

<asp:Repeater Id="companyGridView"
OnItemDataBound="companyGridView_ItemDataBound">
<HeaderTemplate><table><tr><td>Company</td></tr></HeaderTemplate>
<FooterTemplate></table></FooterTemplate>
<ItemTemplate>
<tr><td><asp:Label Text="<%# Eval("CompanyName") %>">
<asp:Repeater Id="addressGridView">
<HeaderTemplate><table><tr><td>Address</td></tr></HeaderTemplate>
<FooterTemplate></table></FooterTemplate>
<ItemTemplate>
<tr><td><asp:Label Text="<%# Eval("CompanyAddress") %>">
</td></tr>
</ItemTemplate>
</asp:Repeater>
</td></tr>
</ItemTemplate>
</asp:Repeater>


In your code behind:

protected void companyGridView_ItemDataBound(object sender,
RepeaterItemEventArgs e) {
if( e.Item.ItemType == ItemType.Item || e.Item.ItemType ==
ItemType.AlternatingItem) {
Company boundObj = e.Item.DataItem as Company; // your Company
object which is binding
Repeater rpt = e.Item.FindControl("addressGridView") as Repeater; //
ger reference
rpt.DataSource = Companay.Address; // Address must be a boundable
object (sorry if I don't use this term exactly) (IList, IEnumberable,
DataTable, ..)
rpt.DataBind();
}
}

The important thing is ItemDataBound event, you registter that event and
do anything you want
 
The "DataGridViewTextBoxColumn" (and the "windowsforms" group in the
cross-post) indicates that this is windows-forms, not asp.net, but
this is an easy mistake to make when it isn't clear.

For the OP's benefit - if you limit yourself to a single appropriate
group (such as windowsforms) then this type of mixup is avoided. For
future questions, you might want to consider
microsoft.public.dotnet.framework.windowsforms.databinding.

DataGridView (winform) only supports direct properties for columns.
Adding a facade method could be an option if you own the class. If
not, there are some other (more complex) tricks you can use to provide
a runtime shadow property. Let me know if you need this, but note that
a facade method is preferable for simplicity, i.e.

public string EmployeeName { // facade to Employee.Name
get {return Employee.Name;}
set {Employee.Name = value;}
}

Marc
 
Marc said:
The "DataGridViewTextBoxColumn" (and the "windowsforms" group in the
cross-post) indicates that this is windows-forms, not asp.net, but
this is an easy mistake to make when it isn't clear.

For the OP's benefit - if you limit yourself to a single appropriate
group (such as windowsforms) then this type of mixup is avoided. For
future questions, you might want to consider
microsoft.public.dotnet.framework.windowsforms.databinding.

DataGridView (winform) only supports direct properties for columns.
Adding a facade method could be an option if you own the class. If
not, there are some other (more complex) tricks you can use to provide
a runtime shadow property. Let me know if you need this, but note that
a facade method is preferable for simplicity, i.e.

public string EmployeeName { // facade to Employee.Name
get {return Employee.Name;}
set {Employee.Name = value;}
}

Marc
Click to expand...

Oh, I'm sorry :)
 
Back
Top