ParseChildren(false) not adding sub objects in the designer

S

Sam Fields

I have been wrestling with this code for about 2 weeks now. My goal is to
create a table for formatting purposes. I want to standardize it as a
webcontrol. I want all of the content to persist as top-level controls so
that they are visible to the asp.net designer -- PersistChildren(true). The
code works fine for run-time, but will not call AddParsedSubObject for
design-time. How do I get my child controls to display properly in the
asp.net designer?

Thanks to any who can help!
Sam Fields


Here is a sample of what I am trying to build in its simplest format:

c# code:
namespace testbed
{
[ParseChildren(false), PersistChildren(true)]
[ToolboxData("<{0}:test runat=server></{0}:test>")]
public class test : Table
{
private TableCell innercell = new TableCell();
public test()
{
this.Rows.Add(new TableRow());
this.Rows[0].Cells.Add(new TableCell());
this.Rows[0].Cells[0].Text = "Header";

this.Rows.Add(new TableRow());
this.Rows[1].Cells.Add(innercell);

this.Rows.Add(new TableRow());
this.Rows[2].Cells.Add(new TableCell());
this.Rows[2].Cells[0].Text = "Footer";
}

protected override void AddParsedSubObject(object obj)
{
innercell.Controls.Add((Control) obj);
this.ChildControlsCreated = false;
}
}
}

..aspx page:
<%@ Register TagPrefix="cc" Namespace="testbed" Assembly="testbed" %>
<%@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false"
Inherits="testbed._default" %>
<HTML>
<HEAD>
<title>default</title>
</HEAD>
<body>
<form id="default" method="post" runat="server">
<cc:test id="content" runat="server">
MyContent
<asp:Label id="mylabel" text="MyLabel" Runat="server"></asp:Label>
</cc:test>
</form>
</body>
</HTML>
 
S

Sam Fields

More information:
If the inner content is literal, the AddParsedSubObject override is adding
the "LiteralControl" at design time. It is only when the <asp:Label> is
added to the inner content that the design time rendering fails.

Any help would be greatly appreciated!
Thanks, Sam Fields
 
R

RadekP

Sam..

I'm afraid you are never going to achieve design time rendering of children
controls persisted with [ParseChildren(false)] [PersistChildren(true)].
First of - AddParsedSubObject method runs only at run-time. ControlBuilder's
are the ones executed at parse time - they generate a tree similar to
control tree but containing instances of ControlBuilders. Nevertheless I
would recommend to implement ITemplate interface and
TemplatedControlDesigner for control.

Regards

Radek

Sam Fields said:
More information:
If the inner content is literal, the AddParsedSubObject override is adding
the "LiteralControl" at design time. It is only when the <asp:Label> is
added to the inner content that the design time rendering fails.

Any help would be greatly appreciated!
Thanks, Sam Fields

Sam Fields said:
I have been wrestling with this code for about 2 weeks now. My goal is to
create a table for formatting purposes. I want to standardize it as a
webcontrol. I want all of the content to persist as top-level controls so
that they are visible to the asp.net designer -- PersistChildren(true). The
code works fine for run-time, but will not call AddParsedSubObject for
design-time. How do I get my child controls to display properly in the
asp.net designer?

Thanks to any who can help!
Sam Fields


Here is a sample of what I am trying to build in its simplest format:

c# code:
namespace testbed
{
[ParseChildren(false), PersistChildren(true)]
[ToolboxData("<{0}:test runat=server></{0}:test>")]
public class test : Table
{
private TableCell innercell = new TableCell();
public test()
{
this.Rows.Add(new TableRow());
this.Rows[0].Cells.Add(new TableCell());
this.Rows[0].Cells[0].Text = "Header";

this.Rows.Add(new TableRow());
this.Rows[1].Cells.Add(innercell);

this.Rows.Add(new TableRow());
this.Rows[2].Cells.Add(new TableCell());
this.Rows[2].Cells[0].Text = "Footer";
}

protected override void AddParsedSubObject(object obj)
{
innercell.Controls.Add((Control) obj);
this.ChildControlsCreated = false;
}
}
}

.aspx page:
<%@ Register TagPrefix="cc" Namespace="testbed" Assembly="testbed" %>
<%@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false"
Inherits="testbed._default" %>
<HTML>
<HEAD>
<title>default</title>
</HEAD>
<body>
<form id="default" method="post" runat="server">
<cc:test id="content" runat="server">
MyContent
<asp:Label id="mylabel" text="MyLabel" Runat="server"></asp:Label>
</cc:test>
</form>
</body>
</HTML>
Click to expand...
Click to expand...
 
S

Sam Fields

I will give that a try. It doesn't make sense, though, that a
LiteralControl is added to the inner cell at design time if the literal is
the only contained information. Why, then, does this happen if
AddParsedSubObject is a run-time only call?

Thanks for your response! Sam

RadekP said:
Sam..

I'm afraid you are never going to achieve design time rendering of children
controls persisted with [ParseChildren(false)] [PersistChildren(true)].
First of - AddParsedSubObject method runs only at run-time. ControlBuilder's
are the ones executed at parse time - they generate a tree similar to
control tree but containing instances of ControlBuilders. Nevertheless I
would recommend to implement ITemplate interface and
TemplatedControlDesigner for control.

Regards

Radek

Sam Fields said:
More information:
If the inner content is literal, the AddParsedSubObject override is adding
the "LiteralControl" at design time. It is only when the <asp:Label> is
added to the inner content that the design time rendering fails.

Any help would be greatly appreciated!
Thanks, Sam Fields
Click to expand...
is
to
Click to expand...
controls
so
that they are visible to the asp.net designer --
Click to expand...
PersistChildren(true).
The
code works fine for run-time, but will not call AddParsedSubObject for
design-time. How do I get my child controls to display properly in the
asp.net designer?

Thanks to any who can help!
Sam Fields


Here is a sample of what I am trying to build in its simplest format:

c# code:
namespace testbed
{
[ParseChildren(false), PersistChildren(true)]
[ToolboxData("<{0}:test runat=server></{0}:test>")]
public class test : Table
{
private TableCell innercell = new TableCell();
public test()
{
this.Rows.Add(new TableRow());
this.Rows[0].Cells.Add(new TableCell());
this.Rows[0].Cells[0].Text = "Header";

this.Rows.Add(new TableRow());
this.Rows[1].Cells.Add(innercell);

this.Rows.Add(new TableRow());
this.Rows[2].Cells.Add(new TableCell());
this.Rows[2].Cells[0].Text = "Footer";
}

protected override void AddParsedSubObject(object obj)
{
innercell.Controls.Add((Control) obj);
this.ChildControlsCreated = false;
}
}
}

.aspx page:
<%@ Register TagPrefix="cc" Namespace="testbed" Assembly="testbed" %>
<%@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false"
Inherits="testbed._default" %>
<HTML>
<HEAD>
<title>default</title>
</HEAD>
<body>
<form id="default" method="post" runat="server">
<cc:test id="content" runat="server">
MyContent
<asp:Label id="mylabel" text="MyLabel" Runat="server"></asp:Label>
</cc:test>
</form>
</body>
</HTML>
Click to expand...
Click to expand...
Click to expand...
 

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