[Translation] Traversed ASP.NET Page Control
Looping through controls in asp.net
"How to traverse all controls all of the ASP.NET page?" This is one of the most common problems in the community. Usually our answer to this question is: "Implement using the controls attribute of the Page class"! This Controls property allows us to get all the child controls for a control, but if one of the sub-controls also have their own sub-control, it is difficult to get all the controls all of the ASP.NET page only using this property. Therefore, to solve this problem at all, we need to write some additional methods to get all the controls in the page.
Suppose there are several TextBox in the page, we want to traverse the entire page, then get all the TextBox's Name and Value, and display them in the DataGrid.
Before we start traversing page, you need to create a class to store Name and Value of TextBox, 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 properties: "name" and "value", define a public ArrayList (OARRAYLIST) for storing data. Figure:
To implement all controls all over the ASP.NET page, we also need to define a major approach. This method receives a parameter of a Control type. If this parameter is TextBox, it stores its Name and Value.
code show as below:
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 the
OARRAYLIST.ADD (New UtilityObj (frmctrl.id, directcast (frmctrl, textbox) .text))
END IF
IF frmctrl.hascontrols kil
LoopingControls (frmctrl)
END IF
NEXT
End Sub
We can use this method to realize all controls all over the ASP.NET page
LoopingControls (Page)
DataGrid1.datasource = OARRAYLIST
DataGrid1.databind ()
