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Control. Please, does anyone knows how to solve this? Thank You!

P: n/a
Hello,

I want to create an ordered list where each list item can have various
controls:

<ol>
<li>textbox, label, ...</li>
...
</ol>

I created two classes: List and ListItem
List class renders as <oland I add ListItems to it, as a
Generic.List(Of ListItem)
ListItem rendes as <liand I add web controls (textbox, label, etc)
to it, as a Generic.List(Of WebControl)

For the past 4 days I tried everything I could think of but until now
I wasn't able to make this work.

As far as I can understand the Generic.Lists are not working since
they always count 0.

Could someone, please, help me? I really don't know what else to do.

Here is my full code:

1 ' List
2 <DefaultProperty("ID"), ToolboxData("<{0}:List runat=server></
{0}:List>")_
3 Public Class List
4 Inherits WebControl
5 Implements INamingContainer
6
7 ' Items ...
8 <Bindable(True), Category("Settings"), DefaultValue(""),
Localizable(True), PersistenceMode(PersistenceMode.InnerProperty)_
9 Property Items() As Generic.List(Of ListItem)
10 Get
11 If ViewState("Items") Is Nothing Then
12 Return New Generic.List(Of ListItem)
13 Else
14 Return ViewState("Items")
15 End If
16 End Get
17 Set(ByVal Value As Generic.List(Of ListItem))
18 ViewState("Items") = Value
19 End Set
20 End Property ' Items
21
22
23
24
25 ' New
26 Public Sub New()
27 End Sub ' New
28
29 ' Add
30 Public Sub Add(ByVal item As ListItem)
31
32 ' Add item to items
33 Me.Items.Add(item)
34
35 End Sub ' Add
36
37 ' CreateChildControls
38 Protected Overrides Sub CreateChildControls()
39
40 ' Add controls to item
41 For Each item As ListItem In Me.Items
42 MyBase.Controls.Add(item)
43 Next ' item
44
45 HttpContext.Current.Response.Write("List Items:" &
Me.Items.Count.ToString)
46
47 ' Create child controls
48 MyBase.CreateChildControls()
49 Me.ChildControlsCreated = True
50
51 End Sub ' CreateChildControls
52
53 ' RenderBeginTag
54 Public Overloads Overrides Sub RenderBeginTag(ByVal writer As
HtmlTextWriter)
55
56 ' Add control attributes
57 With writer
58 If Not String.IsNullOrEmpty(Me.ID)
Then .AddAttribute(HtmlTextWriterAttribute.Id, Me.ClientID)
59 If Not String.IsNullOrEmpty(Me.CssClass)
Then .AddAttribute(HtmlTextWriterAttribute.Class, Me.CssClass)
60 End With ' writer
61
62 ' Render begin tag
63 writer.RenderBeginTag(HtmlTextWriterTag.Ol)
64
65 End Sub ' RenderBeginTag
66
67 ' RenderEndTag
68 Public Overloads Overrides Sub RenderEndTag(ByVal writer As
HtmlTextWriter)
69
70 ' Render end tag
71 writer.RenderEndTag()
72
73 End Sub ' RenderEndTag
74
75 End Class ' List
76
77 ' ListItem
78 <DefaultProperty("ID"), ToolboxData("<{0}:ListItem
runat=server></{0}:ListItem>")_
79 Public Class ListItem
80 Inherits WebControl
81 Implements INamingContainer
82
83 ' WebControls ...
84 <Bindable(True), Category("Settings"), DefaultValue(""),
Localizable(True), PersistenceMode(PersistenceMode.InnerProperty)_
85 Property WebControls() As Generic.List(Of WebControl)
86 Get
87 If ViewState("WebControls") Is Nothing Then
88 Return New Generic.List(Of WebControl)
89 Else
90 Return ViewState("WebControls")
91 End If
92 End Get
93 Set(ByVal Value As Generic.List(Of WebControl))
94 ViewState("WebControls") = Value
95 End Set
96 End Property ' WebControls
97
98 ' New
99 Public Sub New()
100 End Sub ' New
101
102 ' New
103 Public Sub New(ByVal id As String, ByVal controls() As
WebControl)
104
105 ' Define control properties
106 Me.ID = id
107 Me.WebControls = New System.Collections.Generic.List(Of
WebControl)(controls)
108
109 End Sub ' New
110
111 ' CreateChildControls
112 Protected Overrides Sub CreateChildControls()
113
114 ' Add controls to item
115 For Each control As WebControl In Me.WebControls
116 MyBase.Controls.Add(control)
117 Next ' control
118
119 HttpContext.Current.Response.Write("Web Controls Count:"
& Me.WebControls.Count.ToString)
120
121 ' Create child controls
122 MyBase.CreateChildControls()
123 Me.ChildControlsCreated = True
124
125 End Sub ' CreateChildControls
126
127 ' RenderBeginTag
128 Public Overloads Overrides Sub RenderBeginTag(ByVal writer As
HtmlTextWriter)
129
130 ' Add control attributes
131 With writer
132 If Not String.IsNullOrEmpty(Me.ID)
Then .AddAttribute(HtmlTextWriterAttribute.Id, Me.ClientID)
133 If Not String.IsNullOrEmpty(Me.CssClass)
Then .AddAttribute(HtmlTextWriterAttribute.Class, Me.CssClass)
134 End With ' writer
135
136 ' Render begin tag
137 writer.RenderBeginTag(HtmlTextWriterTag.Li)
138
139 End Sub ' RenderBeginTag
140
141 ' RenderEndTag
142 Public Overloads Overrides Sub RenderEndTag(ByVal writer As
HtmlTextWriter)
143
144 ' Render end tag
145 writer.RenderEndTag()
146
147 End Sub ' RenderEndTag
148
149 End Class ' ListItem
And I am using it as follows:

1 Dim myList As List
2
3 With myList.Items
4 .Add(New ListItem("liName", New WebControl() {lName,
tbName}))
5 ...
6 End With

Thanks,

Miguel

May 30 '07 #1
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