本文整理匯總了VB.NET中System.Web.UI.WebControls.CustomValidator.EvaluateIsValid方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET CustomValidator.EvaluateIsValid方法的具體用法？VB.NET CustomValidator.EvaluateIsValid怎麽用？VB.NET CustomValidator.EvaluateIsValid使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。
在下文中一共展示了CustomValidator.EvaluateIsValid方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: EvaluateIsValid
' 導入命名空間
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomCustomValidatorEvaluateIsValid
Inherits System.Web.UI.WebControls.CustomValidator
Protected Overrides Function EvaluateIsValid() As Boolean
Dim isValid As Boolean = False
' Get the name of the control to validate.
Dim controlToValidate As String = Me.ControlToValidate
If controlToValidate.Length > 0 Then
' Get the control's value.
Dim controlValue As String = GetControlValidationValue(controlToValidate)
' If the value is not null and not empty, test whether
' check if the value entered into the text box is even,
' if so return true, else return false in all other cases.
If Not (controlValue Is Nothing) AndAlso _
Not controlValue.Trim().Equals(System.String.Empty) Then
Try
Dim i As Integer = Integer.Parse(controlValue)
isValid = ((i Mod 2) = 0)
Catch
End Try
End If
End If
Return isValid
End Function
End Class
End Namespace