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Propriedade BaseValidator.IsValid

 

Obtém ou define um valor que indica se o controle de entrada associado passa na validação.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (em System.Web.dll)

[BrowsableAttribute(false)]
[ThemeableAttribute(false)]
public bool IsValid { get; set; }

Valor da Propriedade

Type: System.Boolean

true se o controle de entrada associado passar na validação; caso contrário, false. O valor padrão é true.

Use the P:System.Web.UI.WebControls.BaseValidator.IsValid property to determine whether the associated input control passes validation.

System_CAPS_cautionCuidado

Because the default value of this property is true, it will return true if you query this property before validation is performed. For example, this might occur if you attempt to use this property in the E:System.Web.UI.Control.Load event of a page.

The P:System.Web.UI.WebControls.BaseValidator.IsValid property is evaluated only when the M:System.Web.UI.WebControls.BaseValidator.Validate method is called. You can call the M:System.Web.UI.WebControls.BaseValidator.Validate method for each validation control on the page individually, or call all of them at once by using the M:System.Web.UI.Page.Validate method. Button controls with their CausesValidation property set to true will also call the M:System.Web.UI.Page.Validate method.

System_CAPS_noteObservação

It is possible to change the value of this property manually after validation has taken place. This allows you to override the validation result, if necessary.

The P:System.Web.UI.Page.IsValid property for the page is set to true only if the P:System.Web.UI.WebControls.BaseValidator.IsValid property for each validation control on the page is also set to true.

This property cannot be set by themes or style sheet themes. For more information, see T:System.Web.UI.ThemeableAttribute and ASP.NET Themes and Skins.

The following code example demonstrates how to use the P:System.Web.UI.WebControls.BaseValidator.IsValid property to determine whether the associated input control passes validation.

System_CAPS_security Segurança Observação

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void Button_Click(Object sender, EventArgs e) 
  {
    if (NumberCompareValidator.IsValid && TextBoxRequiredValidator.IsValid)
    {
      MessageLabel.Text = "Page submitted successfully.";
    }
    else
    {
      MessageLabel.Text = "There is an error on the page.";
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>Validator Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>Validator Example</h3>

      Enter a number from 1 to 10.
      <asp:textbox id="NumberTextBox" 
        runat="server"/>

      <asp:rangevalidator id="NumberCompareValidator" 
        controltovalidate="NumberTextBox"
        enableclientscript="False"  
        type="Integer"
        display="Dynamic" 
        errormessage="Please enter a value from 1 to 10."
        maximumvalue="10"
        minimumvalue="1"  
        text="*"
        runat="server"/>

      <asp:requiredfieldvalidator id="TextBoxRequiredValidator" 
        controltovalidate="NumberTextBox"
        enableclientscript="False"
        display="Dynamic" 
        errormessage="Please enter a value."
        text="*"
        runat="server"/>

      <br /><br />

      <asp:button id="SubmitButton"
        text="Submit"
        onclick="Button_Click"
        runat="server"/>

      <br /><br />

      <asp:label id="MessageLabel" 
        runat="server"/>

      <br /><br />

      <asp:validationsummary
        id="ErrorSummary"
        runat="server"/>

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

.NET Framework
Disponível desde 1.1
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