I faced with my understanding about â€œParseChildrenAttributeâ€ class

Pab · May 22, 2008

Hi,
I faced with my understanding about â€œParseChildrenAttributeâ€ class using. My
example is following: two classes are created: Employee and
CollectionEmployee. To CollectionEmployee class I applied ParseChildren
attribyte as â€œ[ParseChildren(typeof(Employee))]â€, but I donâ€™t know how to
collect Employee in CreateChildControls method (Controls collection is
empty). If Iâ€™ll replace line â€œ[ParseChildren(typeof(Employee))]â€™ with
â€œ[ParseChildren(true, "Employees")]â€ so I can access Employee instances in
â€œEmployeesâ€™ Array List. Not bad, but in this case when I try to write tag
under â€œ<CollectionEmployee >â€ tag in VS editor, IntelliSense offer list of in
all classes in â€œtâ€ namespace â€“ itâ€™s not right. So both cases are no
convenient, can anybody help me with this task?

Namespace t
{
public sealed class Employee: WebControl
{â€¦}

[ParseChildren(typeof(Employee))]
public sealed class CollectionEmployee: WebControl
{..
private ArrayList employees = new ArrayList();
public ArrayList Employees
{
get
{
return employees;
}
}
protected override void CreateChildControls()
{
??????????
}
..
}
}

<body>
<form id="form1" runat="server">
<t.CollectionEmployee id=" CollectionChildControl1" runat="server">

<t.Employee Name="Employee 1"
Title="Title 1" />
<t.Employee Name="Employee 2"
Title="Title 2" />
</t.CollectionEmployee >
â€¦..

Teemu Keiski · May 22, 2008

Hi,

if you have at least .NET 2.0 (generics) at your disposal, you could try to
use Generic List typed to Employee instead of ArrayList. I have VS2008, and
following code worked pretty fine with it (Intellisense suggests only
Employee control as child elements to CollectionEmployee)

If you use VS2005, the System.Linq etc namespace imports won't work for you

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI;

namespace WebApplication2
{
public class Employee : WebControl
{
public string Name
{
get;
set;
}

protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
//as an example just writing the name out
writer.RenderBeginTag(HtmlTextWriterTag.Span);
writer.Write(Name);
writer.RenderEndTag();
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
[ParseChildren(typeof(Employee),DefaultProperty="Employees",ChildrenAsProperties=true)]
public class CollectionEmployee : WebControl, INamingContainer
{
private List<Employee> _employees = null;
public List<Employee> Employees
{
get
{
if (_employees == null)
_employees = new List<Employee>();

return _employees;
}
}

protected override void CreateChildControls()
{
base.CreateChildControls();
foreach (Employee e in Employees)
{
Controls.Add(e);
Controls.Add(new LiteralControl("Something here"));
}
}
}
}

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

Pab said:
Hi,
I faced with my understanding about "ParseChildrenAttribute" class using.
My
example is following: two classes are created: Employee and
CollectionEmployee. To CollectionEmployee class I applied ParseChildren
attribyte as "[ParseChildren(typeof(Employee))]", but I don't know how to
collect Employee in CreateChildControls method (Controls collection is
empty). If I'll replace line "[ParseChildren(typeof(Employee))]' with
"[ParseChildren(true, "Employees")]" so I can access Employee instances in
"Employees' Array List. Not bad, but in this case when I try to write tag
under "<CollectionEmployee >" tag in VS editor, IntelliSense offer list of
in
all classes in "t" namespace - it's not right. So both cases are no
convenient, can anybody help me with this task?

Namespace t
{
public sealed class Employee: WebControl
{.}

[ParseChildren(typeof(Employee))]
public sealed class CollectionEmployee: WebControl
{..
private ArrayList employees = new ArrayList();
public ArrayList Employees
{
get
{
return employees;
}
}
protected override void CreateChildControls()
{
??????????
}
..
}
}

<body>
<form id="form1" runat="server">
<t.CollectionEmployee id=" CollectionChildControl1" runat="server">

<t.Employee Name="Employee 1"
Title="Title 1" />
<t.Employee Name="Employee 2"
Title="Title 2" />
</t.CollectionEmployee >
...

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I faced with my understanding about â€œParseChildrenAttributeâ€ class

Pab

Teemu Keiski

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