PostBackOptions.PerformValidation 屬性

參考

定義

命名空間:: System.Web.UI

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

取得或設定值，指出回傳事件發生之前是否需要用戶端驗證。

public:
 property bool PerformValidation { bool get(); void set(bool value); };

public bool PerformValidation { get; set; }

member this.PerformValidation : bool with get, set

Public Property PerformValidation As Boolean

屬性值

Boolean

如果在回傳事件發生之前需要用戶端驗證，則為 true，否則為 false。預設值是 false。

範例

下列程式代碼範例示範如何使用 ValidationGroup 和 PerformValidation 屬性，以確保兩 TextBox 個控件在產生回傳事件之前輸入的資訊。 NameTextBox與 AgeTextBox 控制項是驗證群組的PersonalInfoGroup一部分，但StateTextBox控制項不是。因此，在產生回傳事件之前，使用者不需要在控件中 StateTextBox 輸入任何數據。

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。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。如需詳細資訊，請參閱 Script Exploits Overview (指令碼攻擊概觀)。

<%@ 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 Page_Init(object sender, EventArgs e)
  {
    PostBackOptions myPostBackOptions = new PostBackOptions(FruitRadioButtonList);

    myPostBackOptions.RequiresJavaScriptProtocol = true;
    myPostBackOptions.PerformValidation = true;
    myPostBackOptions.ValidationGroup = "PersonalInfoGroup";

    string reference = Page.ClientScript.GetPostBackEventReference(myPostBackOptions);
    FruitRadioButtonList.Attributes.Add("onclick", reference);
  } 

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>PerformValidation and ValidationGroup Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
      <h3>PostBackOptions PerformValidation and ValidationGroup Example</h3>
      
      <asp:label id="NameLabel" 
        text="Enter your name:"
        runat="server"
        AssociatedControlID="NameTextBox">
      </asp:label>

      &nbsp
      
      <asp:textbox id="NameTextBox" 
        runat="server">
      </asp:textbox>

      &nbsp

      <asp:requiredfieldvalidator id="RequiredFieldValidator1"
        controltovalidate="NameTextBox"
        validationgroup="PersonalInfoGroup"
        errormessage="Enter your name."
        runat="server">
      </asp:requiredfieldvalidator>
      
      <br /><br />
      
      <asp:label id="AgeLabel" 
        text="Enter your age:"
        runat="server"
        AssociatedControlID="AgeTextBox">
      </asp:label>

      &nbsp
      
      <asp:textbox id="AgeTextBox" 
        runat="server">
      </asp:textbox>

      &nbsp

      <asp:requiredfieldvalidator id="RequiredFieldValidator2"
        controltovalidate="AgeTextBox"
        validationgroup="PersonalInfoGroup"
        errormessage="Enter your age."
        runat="server">
      </asp:requiredfieldvalidator>
      
      <br /><br />
      
      <asp:label id="State" 
        text="Enter the state where you live:"
        runat="server"
        AssociatedControlID="StateTextBox">
      </asp:label>

      &nbsp
      
      <asp:textbox id="StateTextBox" 
        runat="server">
      </asp:textbox>

      &nbsp
      
      <br /><br />
    
    
      <asp:Label id="FruitLabel" 
        text="Please select your preferred fruit:" 
        runat="server"
        AssociatedControlID="FruitRadioButtonList">
      </asp:Label>
      
      <asp:RadioButtonList ID="FruitRadioButtonList" runat="server" >
        <asp:ListItem>Apples</asp:ListItem>
        <asp:ListItem>Oranges</asp:ListItem>
        <asp:ListItem>Pears</asp:ListItem>
        <asp:ListItem>Peaches</asp:ListItem>
        <asp:ListItem>Grapes</asp:ListItem>
        <asp:ListItem>Lemons</asp:ListItem>
        <asp:ListItem>Limes</asp:ListItem>
        <asp:ListItem>Plums</asp:ListItem>
      </asp:RadioButtonList>
      
    </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">
  
  Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
  
    Dim myPostBackOptions As PostBackOptions = New PostBackOptions(FruitRadioButtonList)

    myPostBackOptions.RequiresJavaScriptProtocol = True
    myPostBackOptions.PerformValidation = True
    myPostBackOptions.ValidationGroup = "PersonalInfoGroup"

    Dim reference As String = Page.ClientScript.GetPostBackEventReference(myPostBackOptions)
    FruitRadioButtonList.Attributes.Add("onclick", reference)
    
  End Sub


</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>PerformValidation and ValidationGroup Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
      <h3>PostBackOptions PerformValidation and ValidationGroup Example</h3>
      
      <asp:label id="NameLabel" 
        text="Enter your name:"
        runat="server"
        AssociatedControlID="NameTextBox">
      </asp:label>

      &nbsp
      
      <asp:textbox id="NameTextBox" 
        runat="server">
      </asp:textbox>

      &nbsp

      <asp:requiredfieldvalidator id="RequiredFieldValidator1"
        controltovalidate="NameTextBox"
        validationgroup="PersonalInfoGroup"
        errormessage="Enter your name."
        runat="server">
      </asp:requiredfieldvalidator>
      
      <br /><br />
      
      <asp:label id="AgeLabel" 
        text="Enter your age:"
        runat="server"
        AssociatedControlID="AgeTextBox">
      </asp:label>

      &nbsp
      
      <asp:textbox id="AgeTextBox" 
        runat="server">
      </asp:textbox>

      &nbsp

      <asp:requiredfieldvalidator id="RequiredFieldValidator2"
        controltovalidate="AgeTextBox"
        validationgroup="PersonalInfoGroup"
        errormessage="Enter your age."
        runat="server">
      </asp:requiredfieldvalidator>
      
      <br /><br />
      
      <asp:label id="State" 
        text="Enter the state where you live:"
        runat="server"
        AssociatedControlID="State">
      </asp:label>

      &nbsp
      
      <asp:textbox id="StateTextBox" 
        runat="server">
      </asp:textbox>

      &nbsp
      
      <br /><br />
    
    
      <asp:Label id="FruitLabel" 
        text="Please select your preferred fruit:" 
        runat="server"
        AssociatedControlID="FruitRadioButtonList">
      </asp:Label>
      
      <asp:RadioButtonList ID="FruitRadioButtonList" runat="server" >
        <asp:ListItem>Apples</asp:ListItem>
        <asp:ListItem>Oranges</asp:ListItem>
        <asp:ListItem>Pears</asp:ListItem>
        <asp:ListItem>Peaches</asp:ListItem>
        <asp:ListItem>Grapes</asp:ListItem>
        <asp:ListItem>Lemons</asp:ListItem>
        <asp:ListItem>Limes</asp:ListItem>
        <asp:ListItem>Plums</asp:ListItem>
      </asp:RadioButtonList>
      
    </form>
  </body>
</html>

備註

屬性 PerformValidation 是用來指定是否需要客戶端驗證，才能發生回傳事件。當屬性的值 PerformValidation 設定 true為時，您也可以使用 ValidationGroup 屬性來指定在發生回傳事件之前需要驗證的驗證組名。

適用於

另請參閱

ValidationGroup

共用方式為

PostBackOptions.PerformValidation 屬性

定義

屬性值

範例

備註

適用於

另請參閱

其他資源