Page.Validate Page.Validate Page.Validate Page.Validate Method

定義

指示網頁上包含的任何驗證控制項來驗證它們已指派的資訊。Instructs any validation controls included on the page to validate their assigned information.

多載

Validate() Validate() Validate() Validate()

指示網頁上包含的任何驗證控制項來驗證它們已指派的資訊。Instructs any validation controls included on the page to validate their assigned information.

Validate(String) Validate(String) Validate(String) Validate(String)

指示指定驗證群組中的驗證控制項,驗證其指派的資訊。Instructs the validation controls in the specified validation group to validate their assigned information.

Validate() Validate() Validate() Validate()

指示網頁上包含的任何驗證控制項來驗證它們已指派的資訊。Instructs any validation controls included on the page to validate their assigned information.

public:
 virtual void Validate();
public virtual void Validate ();
abstract member Validate : unit -> unit
override this.Validate : unit -> unit
Public Overridable Sub Validate ()

範例

下列程式碼範例會在Validate已定義數個不同驗證群組的案例中, 于頁面上呼叫方法。The following code example calls the Validate method on a page in a scenario with several different validation groups defined.

重要

這個範例有一個可接受使用者輸入的文字方塊,這可能會造成安全性威脅。This example has a text box that accepts user input, which is a potential security threat. 根據預設,ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。By default, ASP.NET Web pages validate that user input does not include script or HTML elements. 如需詳細資訊,請參閱 Script Exploits Overview (指令碼攻擊概觀)。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">

  protected void Button_Click(object sender, EventArgs e)
  {
    switch (((Button)sender).ID)
    {
      case "Button1":
        if (TextBoxValidator1.IsValid)
        {
          Label1.Text = "TextBox validates.";
        }
        else
        {
          Label1.Text = "";
          Label4.Text = "";
        }
        break;
      case "Button2":
        // Must explicitly cause Validate here because 
        // Button2 has CausesValidation set to false.
        Validate("Group2");
        if (CustomValidator.IsValid)
        {
          Label2.Text = "CheckBox validates.";
        }
        else
        {
          Label2.Text = "";
          Label4.Text = "";
        }
        break;
      default:
      Label1.Text = "";
      Label2.Text = "";
      break;
        
    }
  }

  // Custom validator for check box.
  protected void CustomValidator_ServerValidate(object source, ServerValidateEventArgs args)
  {
    args.IsValid = (CheckBox1.Checked == true);
  }

  protected void Page_Load(object sender, EventArgs e)
  {
    if (IsPostBack && Context.Request.Form["__EVENTTARGET"] == "TextBox2")
    {
      // Handle AutoPostBack TextBox.
      Validate("Group3");
      if (Page.IsValid)
      {
        Label3.Text = "AutoPostBack TextBox validates.";
      }
      else
      {
        Label3.Text = "";
        Label4.Text = "";
      }
    }
    
  }

  protected void Button3_Click(object sender, EventArgs e)
  {
    Validate();
    if (Page.IsValid)
      Label4.Text = "All controls valid.";
    else
    {
      Label1.Text = "";
      Label2.Text = "";
      Label3.Text = "";
      Label4.Text = "";
    }

  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Page Validate</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      TextBox
      <asp:TextBox ID="TextBox1" ValidationGroup="Group1" runat="server"></asp:TextBox>
      <asp:RequiredFieldValidator Display="Static" ID="TextBoxValidator1" ValidationGroup="Group1" runat="server" ControlToValidate="TextBox1" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <br />
      CheckBox
      <asp:CheckBox ID="CheckBox1" ValidationGroup="Group2" runat="server" />
      <asp:CustomValidator ID="CustomValidator" ValidationGroup="Group2" runat="server" Text="(this option required)" OnServerValidate="CustomValidator_ServerValidate" EnableClientScript="False"></asp:CustomValidator>
      <br />
      <asp:Button ID="Button1" ValidationGroup="Group1" CausesValidation="true" runat="server" Text="Validate Group1 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label1" runat="server"></asp:Label>
      <br />
      <asp:Button ID="Button2" ValidationGroup="Group2" CausesValidation="false" runat="server" Text="Validate Group2 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label2" runat="server"></asp:Label>
      <br />
      <br />
      AutoPostBack TextBox
      <asp:TextBox AutoPostBack="true" ID="TextBox2" ValidationGroup="Group3" runat="server" CausesValidation="true"></asp:TextBox>
      <asp:RequiredFieldValidator ID="TextBoxValidator2" ValidationGroup="Group3" runat="server" ControlToValidate="TextBox2" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <asp:Label ID="Label3" runat="server"></asp:Label>
      <br />
      <br />
      <asp:Button ID="Button3" CausesValidation="true" runat="server" Text="Validate All Controls" OnClick="Button3_Click" />
      <asp:Label ID="Label4" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>
<%@ Page Language="VB" %>

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

<script runat="server">

  Protected Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    Select Case CType(sender, Button).ID
      Case "Button1"
        If TextBoxValidator1.IsValid Then
          Label1.Text = "TextBox validates."
        Else
          Label1.Text = ""
          Label4.Text = ""
        End If
      Case "Button2"
        ' Must explicitly cause Validate here because 
        ' Button2 has CausesValidation set to false.
        Validate("Group2")
        If CustomValidator.IsValid Then
          Label2.Text = "CheckBox validates."
        Else
          Label2.Text = ""
          Label4.Text = ""
        End If
      Case Else
        Label1.Text = ""
        Label2.Text = ""
    End Select

  End Sub
  
  Protected Sub CustomValidator_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
     
    args.IsValid = (CheckBox1.Checked)

  End Sub
  
  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    If (IsPostBack) Then
      
    ' Handle AutoPostBack TextBox.
      Validate("Group3")
      If (Page.IsValid) Then
        Label3.Text = "AutoPostBack TextBox validates."
      Else
        Label3.Text = ""
        Label4.Text = ""
      End If
    End If
    
  End Sub

  Protected Sub Button3_Click(ByVal sender As Object, ByVal e As System.EventArgs)
  
    Validate()
    If (Page.IsValid) Then
      Label4.Text = "All controls valid."
    Else
      Label1.Text = ""
      Label2.Text = ""
      Label3.Text = ""
      Label4.Text = ""
    End If
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Page Validate</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      TextBox
      <asp:TextBox ID="TextBox1" ValidationGroup="Group1" runat="server"></asp:TextBox>
      <asp:RequiredFieldValidator Display="Static" ID="TextBoxValidator1" ValidationGroup="Group1" runat="server" ControlToValidate="TextBox1" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <br />
      CheckBox
      <asp:CheckBox ID="CheckBox1" ValidationGroup="Group2" runat="server" />
      <asp:CustomValidator ID="CustomValidator" ValidationGroup="Group2" runat="server" Text="(this option required)" OnServerValidate="CustomValidator_ServerValidate" EnableClientScript="False"></asp:CustomValidator>
      <br />
      <asp:Button ID="Button1" ValidationGroup="Group1" CausesValidation="true" runat="server" Text="Validate Group1 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label1" runat="server"></asp:Label>
      <br />
      <asp:Button ID="Button2" ValidationGroup="Group2" CausesValidation="false" runat="server" Text="Validate Group2 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label2" runat="server"></asp:Label>
      <br />
      <br />
      AutoPostBack TextBox
      <asp:TextBox AutoPostBack="true" ID="TextBox2" ValidationGroup="Group3" runat="server" CausesValidation="true"></asp:TextBox>
      <asp:RequiredFieldValidator ID="TextBoxValidator2" ValidationGroup="Group3" runat="server" ControlToValidate="TextBox2" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <asp:Label ID="Label3" runat="server"></asp:Label>
      <br />
      <br />
      <asp:Button ID="Button3" CausesValidation="true" runat="server" Text="Validate All Controls" OnClick="Button3_Click" />
      <asp:Label ID="Label4" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>

備註

當使用者按一下任何 ASP.NET 伺服器控制項 ( CausesValidation其屬性設為true) (預設值) 時, 就會叫用這個方法。This method is invoked when a user clicks any ASP.NET server control that has the CausesValidation property set to true, which is the default. 其中Button包括、 ImageButton HtmlInputButton HtmlInputImageHtmlButtonWeb服務器控制項、、和 HTML 伺服器控制項, 以及可以自動回傳至伺服器的控制項, 例如LinkButton TextBoxCheckBoxListControl和控制項BulletedListThese include the Button, ImageButton, and LinkButton Web server controls, the HtmlInputButton, HtmlInputImage, and HtmlButton HTML server controls, and controls that can automatically post back to the server such as the TextBox, CheckBox, ListControl, and BulletedList controls.

若要停用頁面上任何按鈕控制項的驗證, 請將按鈕控制項CausesValidation的屬性false設為。To disable validation for any button control on the page, set the button control's CausesValidation property to false.

ValidatorCollectionPage.Validators用這個方法時, 它會逐一查看與屬性相關聯之物件中所包含的驗證控制項, 並針對目前驗證群組中的每個驗證控制項叫用驗證邏輯。When this method is invoked, it iterates through the validation controls contained in the ValidatorCollection object associated with the Page.Validators property and invokes the validation logic for each validation control in the current validation group. 驗證群組是由將頁面張貼至伺服器的控制項所決定。The validation group is determined by the control that posted the page to the server. 如果未指定任何驗證群組, 則不會使用任何驗證群組。If no validation group is specified, then no validation group is used.

注意

頁面驗證的行為已變更。The behavior of page validation has changed. ASP.NET 2.0ASP.NET 2.0中, 控制項不會再Page.Validate()呼叫Page.Validate(String)方法, 而是改為使用方法。In ASP.NET 2.0ASP.NET 2.0, controls no longer call the Page.Validate() method; they use the Page.Validate(String) method instead. 如果您Page.Validate() ASP.NET 2.0ASP.NET 2.0在頁面上使用方法, 則會忽略驗證群組並驗證所有控制項。If you use the Page.Validate() method on an ASP.NET 2.0ASP.NET 2.0 page, validation groups are ignored and all controls are validated.

給繼承者的注意事項

Validate() 使用ASP.NET 2.0ASP.NET 2.0方法。The Validate() method is not used by ASP.NET 2.0ASP.NET 2.0. 當您使用ASP.NET 2.0ASP.NET 2.0時, 請覆Validate(String)寫方法以變更頁面驗證行為。When you are using ASP.NET 2.0ASP.NET 2.0, override the Validate(String) method to change page validation behavior.

另請參閱

Validate(String) Validate(String) Validate(String) Validate(String)

指示指定驗證群組中的驗證控制項,驗證其指派的資訊。Instructs the validation controls in the specified validation group to validate their assigned information.

public:
 virtual void Validate(System::String ^ validationGroup);
public virtual void Validate (string validationGroup);
abstract member Validate : string -> unit
override this.Validate : string -> unit
Public Overridable Sub Validate (validationGroup As String)

參數

validationGroup
String String String String

要驗證的控制項之驗證群組名稱。The validation group name of the controls to validate.

範例

下列程式碼範例會在Validate已定義數個不同驗證群組的案例中, 于頁面上呼叫方法。The following code example calls the Validate method on a page in a scenario with several different validation groups defined.

重要

這個範例有一個可接受使用者輸入的文字方塊,這可能會造成安全性威脅。This example has a text box that accepts user input, which is a potential security threat. 根據預設,ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。By default, ASP.NET Web pages validate that user input does not include script or HTML elements. 如需詳細資訊,請參閱 Script Exploits Overview (指令碼攻擊概觀)。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">

  protected void Button_Click(object sender, EventArgs e)
  {
    switch (((Button)sender).ID)
    {
      case "Button1":
        if (TextBoxValidator1.IsValid)
        {
          Label1.Text = "TextBox validates.";
        }
        else
        {
          Label1.Text = "";
          Label4.Text = "";
        }
        break;
      case "Button2":
        // Must explicitly cause Validate here because 
        // Button2 has CausesValidation set to false.
        Validate("Group2");
        if (CustomValidator.IsValid)
        {
          Label2.Text = "CheckBox validates.";
        }
        else
        {
          Label2.Text = "";
          Label4.Text = "";
        }
        break;
      default:
      Label1.Text = "";
      Label2.Text = "";
      break;
        
    }
  }

  // Custom validator for check box.
  protected void CustomValidator_ServerValidate(object source, ServerValidateEventArgs args)
  {
    args.IsValid = (CheckBox1.Checked == true);
  }

  protected void Page_Load(object sender, EventArgs e)
  {
    if (IsPostBack && Context.Request.Form["__EVENTTARGET"] == "TextBox2")
    {
      // Handle AutoPostBack TextBox.
      Validate("Group3");
      if (Page.IsValid)
      {
        Label3.Text = "AutoPostBack TextBox validates.";
      }
      else
      {
        Label3.Text = "";
        Label4.Text = "";
      }
    }
    
  }

  protected void Button3_Click(object sender, EventArgs e)
  {
    Validate();
    if (Page.IsValid)
      Label4.Text = "All controls valid.";
    else
    {
      Label1.Text = "";
      Label2.Text = "";
      Label3.Text = "";
      Label4.Text = "";
    }

  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Page Validate</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      TextBox
      <asp:TextBox ID="TextBox1" ValidationGroup="Group1" runat="server"></asp:TextBox>
      <asp:RequiredFieldValidator Display="Static" ID="TextBoxValidator1" ValidationGroup="Group1" runat="server" ControlToValidate="TextBox1" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <br />
      CheckBox
      <asp:CheckBox ID="CheckBox1" ValidationGroup="Group2" runat="server" />
      <asp:CustomValidator ID="CustomValidator" ValidationGroup="Group2" runat="server" Text="(this option required)" OnServerValidate="CustomValidator_ServerValidate" EnableClientScript="False"></asp:CustomValidator>
      <br />
      <asp:Button ID="Button1" ValidationGroup="Group1" CausesValidation="true" runat="server" Text="Validate Group1 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label1" runat="server"></asp:Label>
      <br />
      <asp:Button ID="Button2" ValidationGroup="Group2" CausesValidation="false" runat="server" Text="Validate Group2 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label2" runat="server"></asp:Label>
      <br />
      <br />
      AutoPostBack TextBox
      <asp:TextBox AutoPostBack="true" ID="TextBox2" ValidationGroup="Group3" runat="server" CausesValidation="true"></asp:TextBox>
      <asp:RequiredFieldValidator ID="TextBoxValidator2" ValidationGroup="Group3" runat="server" ControlToValidate="TextBox2" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <asp:Label ID="Label3" runat="server"></asp:Label>
      <br />
      <br />
      <asp:Button ID="Button3" CausesValidation="true" runat="server" Text="Validate All Controls" OnClick="Button3_Click" />
      <asp:Label ID="Label4" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>
<%@ Page Language="VB" %>

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

<script runat="server">

  Protected Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    Select Case CType(sender, Button).ID
      Case "Button1"
        If TextBoxValidator1.IsValid Then
          Label1.Text = "TextBox validates."
        Else
          Label1.Text = ""
          Label4.Text = ""
        End If
      Case "Button2"
        ' Must explicitly cause Validate here because 
        ' Button2 has CausesValidation set to false.
        Validate("Group2")
        If CustomValidator.IsValid Then
          Label2.Text = "CheckBox validates."
        Else
          Label2.Text = ""
          Label4.Text = ""
        End If
      Case Else
        Label1.Text = ""
        Label2.Text = ""
    End Select

  End Sub
  
  Protected Sub CustomValidator_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
     
    args.IsValid = (CheckBox1.Checked)

  End Sub
  
  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    If (IsPostBack) Then
      
    ' Handle AutoPostBack TextBox.
      Validate("Group3")
      If (Page.IsValid) Then
        Label3.Text = "AutoPostBack TextBox validates."
      Else
        Label3.Text = ""
        Label4.Text = ""
      End If
    End If
    
  End Sub

  Protected Sub Button3_Click(ByVal sender As Object, ByVal e As System.EventArgs)
  
    Validate()
    If (Page.IsValid) Then
      Label4.Text = "All controls valid."
    Else
      Label1.Text = ""
      Label2.Text = ""
      Label3.Text = ""
      Label4.Text = ""
    End If
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Page Validate</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      TextBox
      <asp:TextBox ID="TextBox1" ValidationGroup="Group1" runat="server"></asp:TextBox>
      <asp:RequiredFieldValidator Display="Static" ID="TextBoxValidator1" ValidationGroup="Group1" runat="server" ControlToValidate="TextBox1" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <br />
      CheckBox
      <asp:CheckBox ID="CheckBox1" ValidationGroup="Group2" runat="server" />
      <asp:CustomValidator ID="CustomValidator" ValidationGroup="Group2" runat="server" Text="(this option required)" OnServerValidate="CustomValidator_ServerValidate" EnableClientScript="False"></asp:CustomValidator>
      <br />
      <asp:Button ID="Button1" ValidationGroup="Group1" CausesValidation="true" runat="server" Text="Validate Group1 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label1" runat="server"></asp:Label>
      <br />
      <asp:Button ID="Button2" ValidationGroup="Group2" CausesValidation="false" runat="server" Text="Validate Group2 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label2" runat="server"></asp:Label>
      <br />
      <br />
      AutoPostBack TextBox
      <asp:TextBox AutoPostBack="true" ID="TextBox2" ValidationGroup="Group3" runat="server" CausesValidation="true"></asp:TextBox>
      <asp:RequiredFieldValidator ID="TextBoxValidator2" ValidationGroup="Group3" runat="server" ControlToValidate="TextBox2" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <asp:Label ID="Label3" runat="server"></asp:Label>
      <br />
      <br />
      <asp:Button ID="Button3" CausesValidation="true" runat="server" Text="Validate All Controls" OnClick="Button3_Click" />
      <asp:Label ID="Label4" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>

備註

當使用者按一下任何 ASP.NET 伺服器控制項 ( CausesValidation其屬性設為true) (預設值) 時, 就會叫用這個方法。This method is invoked when a user clicks any ASP.NET server control that has the CausesValidation property set to true, which is the default. 其中Button包括、 ImageButton HtmlInputButton HtmlInputImageHtmlButtonWeb服務器控制項、、和 HTML 伺服器控制項, 以及可以自動回傳至伺服器的控制項, 例如LinkButton TextBoxCheckBoxListControl和控制項BulletedListThese include the Button, ImageButton, and LinkButton Web server controls, the HtmlInputButton, HtmlInputImage, and HtmlButton HTML server controls, and controls that can automatically post back to the server such as the TextBox, CheckBox, ListControl, and BulletedList controls.

若要停用頁面上任何按鈕控制項的驗證, 請將按鈕控制項CausesValidation的屬性false設為。To disable validation for any button control on the page, set the button control's CausesValidation property to false.

Validate方法會驗證指定的驗證群組。The Validate method validates the specified validation group. 在驗證群組Validate上呼叫方法之後IsValid , true只有當指定的驗證群組和導致頁面張貼到伺服器的控制項的驗證群組都有效時, 方法才會傳回。After calling the Validate method on a validation group, the IsValid method will return true only if both the specified validation group and the validation group of the control that caused the page to be posted to the server are valid.

另請參閱

適用於