本文整理汇总了VB.NET中System.Web.UI.WebControls.CustomValidator.EvaluateIsValid方法的典型用法代码示例。如果您正苦于以下问题：VB.NET CustomValidator.EvaluateIsValid方法的具体用法？VB.NET CustomValidator.EvaluateIsValid怎么用？VB.NET CustomValidator.EvaluateIsValid使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。
在下文中一共展示了CustomValidator.EvaluateIsValid方法的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: EvaluateIsValid
' 导入命名空间
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