traversing asp.net page controls

Asp.net| Traversal | control | page "How do I traverse all the controls on the asp.net page?" "This is one of the most common problems in the community asking questions." Usually our answer to this question is: "Use the controls property of the page class to implement"! This controls property allows us to get all the child controls of a control, but if one of the child controls also has its own child control, it is very difficult to get all the controls on the ASP.net page simply by using this property. So, to solve this problem fundamentally, we need to write some extra methods to get all the controls on the page.

Assuming that there are several textbox in the page, we want to traverse the entire page and get the name and value of all the textbox and display them in the DataGrid.

Before we start traversing the page, we need to create a class that holds the name and value of those textbox, and the code is as follows:

Public Class Utilityobj

Private _name as String

Private _value as String

Public Sub New (ByVal Name As String, ByVal Value as String)

_name = Name

_value = value

End Sub

Public Property Name () as String

Get

return _name

End Get

Set (ByVal Value as String)

_name = Name

End Set

End Property

Public Property Value () as String

Get

Return (_value)

End Get

Set (ByVal Value as String)

_value = value

End Set

End Property

End Class



This class contains two attributes: "Name" and "value", and then defines a public ArrayList (oarraylist) for storing data. As shown in figure:






To implement all the controls that traverse the ASP.net page, we also need to define a major approach. This method receives a parameter of the control type and, if this argument is a TextBox, stores its name and value.

The code is as follows:

Public Sub Loopingcontrols (ByVal Ocontrol as Control)

Dim Frmctrl as Control

Oarraylist = New ArrayList

For each Frmctrl in Ocontrol.controls

If TypeOf Frmctrl is TextBox Then

Oarraylist.add (New utilityobj (frmctrl.id, DirectCast (Frmctrl, TextBox). Text))

End If

If Frmctrl.hascontrols Then

Loopingcontrols (Frmctrl)

End If

Next

End Sub



We can use this method to implement all the controls that traverse the ASP.net page
Loopingcontrols (Page)

DataGrid1.DataSource = Oarraylist

Datagrid1.databind ()