本文整理汇总了VB.NET中System.Web.UI.WebControls.DataControlField类的典型用法代码示例。如果您正苦于以下问题:VB.NET DataControlField类的具体用法?VB.NET DataControlField怎么用?VB.NET DataControlField使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了DataControlField类的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: New
' 导入命名空间
Imports System.Collections.Specialized
Imports System.Collections
Imports System.ComponentModel
Imports System.Security.Permissions
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Namespace Samples.AspNet.VB
<AspNetHostingPermission(SecurityAction.Demand, _
Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class RadioButtonField
Inherits CheckBoxField
Public Sub New()
End Sub
' Gets a default value for a basic design-time experience. Since
' it would look odd, even at design time, to have more than one
' radio button selected, make sure that none are selected.
Protected Overrides Function GetDesignTimeValue() As Object
Return False
End Function
' This method is called by the ExtractRowValues methods of
' GridView and DetailsView. Retrieve the current value of the
' cell from the Checked state of the Radio button.
Public Overrides Sub ExtractValuesFromCell( _
ByVal dictionary As IOrderedDictionary, _
ByVal cell As DataControlFieldCell, _
ByVal rowState As DataControlRowState, _
ByVal includeReadOnly As Boolean)
' Determine whether the cell contain a RadioButton
' in its Controls collection.
If cell.Controls.Count > 0 Then
Dim radio As RadioButton = CType(cell.Controls(0), RadioButton)
Dim checkedValue As Object = Nothing
If radio Is Nothing Then
' A RadioButton is expected, but a null is encountered.
' Add error handling.
Throw New InvalidOperationException( _
"RadioButtonField could not extract control.")
Else
checkedValue = radio.Checked
End If
' Add the value of the Checked attribute of the
' RadioButton to the dictionary.
If dictionary.Contains(DataField) Then
dictionary(DataField) = checkedValue
Else
dictionary.Add(DataField, checkedValue)
End If
End If
End Sub
' This method adds a RadioButton control and any other
' content to the cell's Controls collection.
Protected Overrides Sub InitializeDataCell( _
ByVal cell As DataControlFieldCell, _
ByVal rowState As DataControlRowState)
Dim radio As New RadioButton()
' If the RadioButton is bound to a DataField, add
' the OnDataBindingField method event handler to the
' DataBinding event.
If DataField.Length <> 0 Then
AddHandler radio.DataBinding, AddressOf Me.OnDataBindField
End If
radio.Text = Me.Text
' Because the RadioButtonField is a BoundField, it only
' displays data. Therefore, unless the row is in edit mode,
' the RadioButton is displayed as disabled.
radio.Enabled = False
' If the row is in edit mode, enable the button.
If (rowState And DataControlRowState.Edit) <> 0 _
OrElse (rowState And DataControlRowState.Insert) <> 0 Then
radio.Enabled = True
End If
cell.Controls.Add(radio)
End Sub
End Class
End Namespace