共用方式為

CustomValidator.ControlPropertiesValid 方法

  • 參考

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

檢查控制項的屬性值是否有效。

protected:
 override bool ControlPropertiesValid();
protected override bool ControlPropertiesValid ();
override this.ControlPropertiesValid : unit -> bool
Protected Overrides Function ControlPropertiesValid () As Boolean

傳回

Boolean

如果控制項屬性有效，則為 true，否則為 false。

範例

下列程式碼範例示範如何在自訂伺服器控制項中覆寫 ControlPropertiesValid 方法，讓它一律傳回可見屬性的值，只要 ControlToValidate 控制項的 CustomValidator 屬性位於頁面上且包含驗證屬性。

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom CustomValidator - ControlPropertiesValid - C# Example</title>
    <script runat="server">
    void CustomValidator1_ServerValidate(Object source, ServerValidateEventArgs args) 
    {
      try 
      {
        // Test whether the value entered into the text box is even.
        int i = int.Parse(args.Value);
        args.IsValid = ((i%2) == 0);
      }
      catch(Exception ex)
      {
        args.IsValid = false;
      }
    }
    </script>
  </head>
<body>
  <form id="Form1" method="post" runat="server">
    <h3>Custom CustomValidator - ControlPropertiesValid - C# Example</h3>
    
    <asp:Label id="Label1" runat="server" Text="Enter an even number:" AssociatedControlID="TextBox1" /><br />
    
    <asp:TextBox id="TextBox1" runat="server" /> 
    
    <aspSample:CustomCustomValidatorControlPropertiesValid 
      id="Customvalidator1" 
      runat="server" 
      ControlToValidate="TextBox1" 
      Display="Static" 
      ErrorMessage="Not an even number!" 
      OnServerValidate="CustomValidator1_ServerValidate" /><br /><br />
    
    <asp:Button id="Button1" runat="server" Text="Validate" />
  </form>
</body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom CustomValidator - ControlPropertiesValid - VB.NET Example</title>
    <script runat="server">
      Sub CustomValidator1_ServerValidate(source As Object, args As ServerValidateEventArgs)
        args.IsValid = False
        Try
          ' Test whether the value entered into the text box is even or not.
          Dim i As Integer = Integer.Parse(args.Value)
          If (i Mod 2) = 0 Then
            args.IsValid = True
          End If
        Catch
        End Try
      End Sub
    </script>
  </head>
  <body>
  <form id="Form1" method="post" runat="server">
    <h3>Custom CustomValidator - ControlPropertiesValid - VB.NET Example</h3>
    <asp:Label id="Label1" runat="server" Text="Enter an even number:" AssociatedControlID="TextBox1" /><br />
    <asp:TextBox id="TextBox1" runat="server" /> 
    <aspSample:CustomCustomValidatorControlPropertiesValid id="Customvalidator1" runat="server" ControlToValidate="TextBox1" Display="Static" ErrorMessage="Not an even number!" OnServerValidate="CustomValidator1_ServerValidate" /><br /><br />
    <asp:Button id="Button1" runat="server" Text="Validate" />
  </form>
</body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomCustomValidatorControlPropertiesValid : System.Web.UI.WebControls.CustomValidator
    {
        protected override bool ControlPropertiesValid()
        {
            string controlToValidate = this.ControlToValidate;

            // Determine whether the ControlToValidate is on the page 
            // and contains a valid validation property. 
            if (controlToValidate.Length > 0) 
            {
            base.CheckControlValidationProperty(controlToValidate, "ControlToValidate");
            }

            // If the control is visible, then control is valid 
            // and is ready for validation.
            System.Web.UI.Control control = this.FindControl(controlToValidate);
            return control.Visible;
        }
    }
}

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomCustomValidatorControlPropertiesValid
        Inherits System.Web.UI.WebControls.CustomValidator

        Protected Overrides Function ControlPropertiesValid() As Boolean
            Dim controlToValidate As String = Me.ControlToValidate

            ' Determine whether the ControlToValidate is on the page 
            ' and contains a valid validation property. 
            If controlToValidate.Length > 0 Then
                MyBase.CheckControlValidationProperty(controlToValidate, "ControlToValidate")
            End If

            ' If the control is visible, then control is valid 
            ' and is ready for validation.
            Dim control As System.Web.UI.Control = Me.FindControl(controlToValidate)
            If control.Visible = True Then
                Return True
            Else
                Return False
            End If
        End Function
    End Class
End Namespace

適用於