Editare

Partajați prin

CustomValidator.ControlPropertiesValid Method

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Checks the properties of the control for valid values.

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

Returns

Boolean

true if the control properties are valid; otherwise, false.

Examples

The following code example demonstrates how to override the ControlPropertiesValid method in a custom server control so that it always returns the value of the visible property, as long as the ControlToValidate property of the CustomValidator control is on the page and contains validation properties.

<%@ 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

Applies to