ServerValidateEventHandler 代理人

定義

表示方法,處理 ServerValidate 控制項的 CustomValidator 事件。Represents the method that will handle the ServerValidate event of a CustomValidator control.

public delegate void ServerValidateEventHandler(System::Object ^ source, ServerValidateEventArgs ^ args);
public delegate void ServerValidateEventHandler(object source, ServerValidateEventArgs args);
type ServerValidateEventHandler = delegate of obj * ServerValidateEventArgs -> unit
Public Delegate Sub ServerValidateEventHandler(source As Object, args As ServerValidateEventArgs)

參數

source
Object

事件的來源。The source of the event.

args
ServerValidateEventArgs

ServerValidateEventArgs,其中包含事件資料。A ServerValidateEventArgs that contains the event data.

繼承
ServerValidateEventHandler

範例

下列範例示範如何指定和撰寫伺服器端處理常式的程式碼 CustomValidatorThe following example demonstrates how to specify and code a handler for a server-side CustomValidator. 它會顯示輸入文字方塊中的數位是否為奇數或偶數。It displays whether a number entered into a text box is odd or even.


<%@ 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>CustomValidator ServerValidate Example</title>
<script runat="server">

      void ValidateBtn_OnClick(object sender, EventArgs e) 
      { 

         // Display whether the page passed validation.
         if (Page.IsValid) 
         {

            Message.Text = "Page is valid.";

         }

         else 
         {

            Message.Text = "Page is not valid!";

         }

      }

      void ServerValidation(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" runat="server">
  
      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"  
           Text="Enter an even number:" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"
           AssociatedControlID="Text1"/>

      <br />

      <asp:TextBox id="Text1" 
           runat="server" />
    
      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Names="verdana" 
           Font-Size="10pt"
           OnServerValidate="ServerValidation"
           runat="server"/>

      <br />
 
      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

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


<%@ 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>CustomValidator ServerValidate Example</title>
<script runat="server">

      Sub ValidateBtn_OnClick(sender As Object, e As EventArgs) 

         ' Display whether the page passed validation.
         If Page.IsValid Then 

            Message.Text = "Page is valid."

         Else 

            Message.Text = "Page is not valid!"

         End If

      End Sub

      Sub ServerValidation(source As Object, args As ServerValidateEventArgs)

         Try 

            ' Test whether the value entered into the text box is even.
            Dim num As Integer = Integer.Parse(args.Value)
            args.IsValid = ((num mod 2) = 0)
 
         Catch ex As Exception
         
            args.IsValid = false

         End Try

      End Sub

   </script>    

</head>
<body>

   <form id="form1" runat="server">
  
      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"
           Text="Enter an even number:" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"
           AssociatedControlID="Text1" />

      <br />

      <asp:TextBox id="Text1" 
           runat="server" />
    
      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Names="verdana" 
           Font-Size="10pt"
           OnServerValidate="ServerValidation"
           runat="server"/>

      <br />
 
      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

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


<%@ 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>CustomValidator ServerValidate Example</title>
<script runat="server">

      void ValidateBtn_OnClick(object sender, EventArgs e) 
      { 

         // Display whether the page passed validation.
         if (Page.IsValid) 
         {

            Message.Text = "Page is valid.";

         }

         else 
         {

            Message.Text = "Page is not valid!";

         }

      }

      void ServerValidation(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;

         }

      }

      void Page_Load(object sender, EventArgs e)
      {

         // Manually register the event-handling method for the  
         // ServerValidate event of the CustomValidator control.
         CustomValidator1.ServerValidate += 
             new ServerValidateEventHandler(this.ServerValidation);

      }

   </script>    

</head>
<body>

   <form id="form1" runat="server">
  
      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"  
           Text="Enter an even number:" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"
           AssociatedControlID="Text1"/>

      <br />

      <asp:TextBox id="Text1" 
           runat="server" />
    
      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Names="verdana" 
           Font-Size="10pt"
           runat="server"/>

      <br />
 
      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

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


<%@ 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>CustomValidator ServerValidate Example</title>
<script runat="server">

      Sub ValidateBtn_OnClick(sender As Object, e As EventArgs) 

         ' Display whether the page passed validation.
         If Page.IsValid Then 

            Message.Text = "Page is valid."

         Else 

            Message.Text = "Page is not valid!"

         End If

      End Sub

      Sub ServerValidation(source As Object, args As ServerValidateEventArgs)

         Try 

            ' Test whether the value entered into the text box is even.
            Dim num As Integer = Integer.Parse(args.Value)
            args.IsValid = ((num mod 2) = 0)
 
         Catch ex As Exception
         
            args.IsValid = false

         End Try

      End Sub

      Sub Page_Load(sende As object, e As EventArgs)

         ' Manually register the event-handling method for the  
         ' ServerValidate event of the CustomValidator control.
         AddHandler CustomValidator1.ServerValidate, _
             AddressOf ServerValidation

      End Sub

   </script>    

</head>
<body>

   <form id="form1" runat="server">
  
      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"
           Text="Enter an even number:" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"
           AssociatedControlID="Text1" />

      <br />

      <asp:TextBox id="Text1" 
           runat="server" />
    
      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Names="verdana" 
           Font-Size="10pt"
           runat="server"/>

      <br />
 
      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

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

備註

使用此委派可提供在伺服器上執行驗證的自訂程式碼。Use this delegate to provide custom code that performs validation on the server. 您的程式碼需要驗證 Value args 傳遞至委派之參數的屬性。Your code needs to validate the Value property of the args parameter passed to the delegate. 將驗證的結果儲存在參數的 IsValid 屬性中 argsStore the result of the validation in the IsValid property of the args parameter.

建立 ServerValidateEventHandler 委派時,必須識別處理事件的方法。When you create a ServerValidateEventHandler delegate, you identify the method that will handle the event. 若要使事件與您的事件處理常式產生關聯,請將委派的執行個體 (Instance) 加入至事件。To associate the event with your event handler, add an instance of the delegate to the event. 除非您移除委派,否則每當事件發生時就會呼叫事件處理常式。The event handler is called whenever the event occurs, unless you remove the delegate. 如需事件處理常式委派的詳細資訊,請參閱處理和引發事件For more information about event handler delegates, see Handling and Raising Events.

如需如何處理事件的詳細資訊,請參閱處理和引發事件For more information about how to handle events, see Handling and Raising Events.

擴充方法

GetMethodInfo(Delegate)

取得表示特定委派所代表之方法的物件。Gets an object that represents the method represented by the specified delegate.

適用於

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