CompareValidator.ControlPropertiesValid Metod

Definition

Namnområde:
System.Web.UI.WebControls
Sammansättning:
System.Web.dll

Kontrollerar egenskaperna för kontrollen efter giltiga värden.

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

Returer

Boolean

trueom kontrollegenskaperna är giltiga; annars . false

Undantag

HttpException

ControlToValidate och ControlToCompare har samma ID.

-eller-

Det går inte att konvertera värdet för en målegenskap till den förväntade Type.

Exempel

Följande kodexempel visar hur du åsidosätter ControlPropertiesValid metoden i en anpassad serverkontroll så att den alltid returnerar värdet för den synliga egenskapen, så länge ControlToCompare kontrollens CompareValidator egenskap finns på sidan och innehåller valideringsegenskaper.

Important

Det här exemplet har en textruta som accepterar användarindata, vilket är ett potentiellt säkerhetshot. Som standard kontrollerar ASP.NET webbsidor att användarindata inte innehåller skript- eller HTML-element. Mer information finns i Översikt över skriptexploateringar.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<!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 CompareValidator - ControlPropertiesValid - C# Example</title>
    <script runat="server">
      void Page_Load(Object sender, EventArgs e)
      {
        // Run the Page Validate method in order to force
        // the CompareValidate to show it's error message.
        Page.Validate();
      }
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom CompareValidator - ControlPropertiesValid - C# Example</h3>

      <asp:TextBox id="TextBox1" runat="server">123</asp:TextBox><br />

      <aspSample:CustomCompareValidatorControlPropertiesValid
        id="CompareValidator1"
        runat="server"
        Display="Dynamic"
        ErrorMessage="The value of TextBox1 must be '456'."
        ControlToValidate="TextBox1"
        ValueToCompare="456" /><br />

      <asp:Button id="Button1" runat="server" Text="Button" />

    </form>
  </body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page language="VB" %>
<!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 CompareValidator - ControlPropertiesValid - VB.NET Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom CompareValidator - ControlPropertiesValid - C# Example</h3>
            <asp:TextBox id="TextBox1" runat="server">123</asp:TextBox><br />
            <aspSample:CustomCompareValidatorControlPropertiesValid
             id="CompareValidator1" runat="server" Display="Dynamic"
             ErrorMessage="The value of TextBox1 must be '456'."
             ControlToValidate="TextBox1" ValueToCompare="456" /><br />
             <asp:Button id="Button1" runat="server" Text="Button" />
    </form>
  </body>
</html>

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

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomCompareValidatorControlPropertiesValid : System.Web.UI.WebControls.CompareValidator
    {
        protected override bool ControlPropertiesValid()
        {
            // Determine whether the ControlToValidate is on the page and contains a validation properties. 
            base.CheckControlValidationProperty(this.ControlToValidate, "ControlToValidate");

            // If the control is visible, then control is valid and is ready for validation.
            System.Web.UI.Control control = this.FindControl(this.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 CustomCompareValidatorControlPropertiesValid
        Inherits System.Web.UI.WebControls.CompareValidator

        Protected Overrides Function ControlPropertiesValid() As Boolean

            ' Determine whether the ControlToValidate is on the page and contains a validation properties. 
            MyBase.CheckControlValidationProperty(Me.ControlToValidate, "ControlToValidate")

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

Gäller för