Hello,
I have created a simple webcontrol named MyControl tahat contains one single
property. The property name is Columns , his type is ColumnCollection (
inherits from CollectionBase). this property contains an elements list and
the type of these elements is Column.
On a WebForm (in design mode), i insert my MyControl webcontrol . Je fill
in his Columns property ( it inherits from CollectionBase type so the
collection editor is opened ). Then i switch to Html mode to see the
generated Xml code :
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false"
Inherits="Xes_Web_Controls.WebForm1" %>
<%@ Register TagPrefix="cc1" Namespace="Controls" Assembly="Controls" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5"
name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<cc1:mycontrol id="MyControl9" style="Z-INDEX: 101; LEFT: 336px;
POSITION: absolute; TOP: 168px" runat="server" Width="464px">
<Columns>
<cc1:Column Type="string" Name="prenom"></cc1:Column>
<cc1:Column Type="string" Name="nom"></cc1:Column>
</Columns>
</cc1:mycontrol>
</form>
</body>
</HTML>
At this step there is no problem. Buyt then i close the file which contains
my webform, then i re-open the file. I switch to design mode and there is an
error on my control ('' could not be set on property 'Columns' ).
I do not understand this error and do no know resolve this error.
Does anybody help me
Thanks
Loïc
PS : at bottom, we can find my sources
[MyControl.cs]
using System;
using System.ComponentModel ;
using System.Web.UI ;
using System.Web.UI.WebControls ;
namespace Controls
{
public class MyControl : WebControl
{
private ColumnCollection m_columns ;
public MyControl()
{
m_columns = new ColumnCollection() ;
}
[
PersistenceMode(PersistenceMode.InnerProperty),
DesignerSerializationVisibility(DesignerSerializat ionVisibility.Content),
NotifyParentProperty(true)
]
public ColumnCollection Columns
{
get { return m_columns ; }
set { m_columns = value ; }
}
}
}
[ColumnCollection.cs]
namespace Controls
{
using System;
using System.Collections ;
using System.ComponentModel ;
using System.Web.UI ;
public class ColumnCollection : CollectionBase
{
public ColumnCollection() : base( )
{
}
public void AddColumn( Column _col )
{
List.Add( _col ) ;
}
[NotifyParentProperty(true)]
public Column this[int index]
{
get { return List[index] as Column ; }
set { List[index] = value ; }
}
}
}
[Column.cs]
namespace Controls
{
using System;
public class Column
{
private string m_name ;
private string m_type ;
public Column()
{
}
public string Name
{
get { return m_name ; }
set { m_name = value ; }
}
public string Type
{
set { m_type = value ; }
get { return m_type ; }
}
}
}
