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自訂控制項產生器範例

  • 發行項

下列範例將定義一個自訂控制項產生器 (NoWhiteSpaceControlBuilder) 並將它和自訂控制項 (NoWhiteSpaceControl) 關聯。為比較起見，同時也加入一個不包含自訂產生器的第二個控制項。若要建置這個範例，請參閱伺服器控制項範例中的說明。

namespace CustomControls 
{  
   using System;
   using System.Web.UI;
   
   public class NoWhiteSpaceControlBuilder : ControlBuilder 
   {  
      public override bool AllowWhitespaceLiterals() 
      {
         return false;
      }
   }
   
   [ ControlBuilderAttribute(typeof(NoWhiteSpaceControlBuilder))]
   public class NoWhiteSpaceControl : Control 
   {}
   
   public class WhiteSpaceControl : Control 
   {}
   
}
[Visual Basic]
Option Explicit
Option Strict

Imports System
Imports System.Web.UI

Namespace CustomControls
   Public Class NoWhiteSpaceControlBuilder
      Inherits ControlBuilder
      
      Public Overrides Function AllowWhitespaceLiterals() As Boolean
         Return False
      End Function
   End Class
   
   <ControlBuilderAttribute(GetType(NoWhiteSpaceControlBuilder))> _
   Public Class NoWhiteSpaceControl
      Inherits Control
   End Class
   
   Public Class WhiteSpaceControl
      Inherits Control
   End Class
End Namespace

自訂控制項產生器範例測試網頁

下列 .aspx 網頁將使用一個擁有自訂控制項產生器的自訂控制項 NoWhiteSpaceControl。為比較起見，網頁中也包含一個使用預設控制項產生器的控制項 (WhiteSpaceControl)。

<%@ Register TagPrefix="Custom" Namespace="CustomControls" Assembly = "CustomControls" %>

<html>
<body>         
<form  runat=server>
<pre>             
<Custom:NoWhiteSpaceControl Id = "NoSpace" runat=server>
This control does not allow white spaces.
<asp:Label runat = server id = "nospacel1" Text = "First label inside no white space control." />

<asp:Label runat = server id = "nospacel2" Text = "Second label after white space ." />
</Custom:NoWhiteSpaceControl>
 
<br><br>             
<Custom:WhiteSpaceControl Id = "Space" runat=server>
This control allows white spaces.
<asp:Label runat = server id = "spacel1" Text = "First label inside white space control." />

 
<asp:Label runat = server id = "spacel2" Text = "Second label after white space." />
</Custom:WhiteSpaceControl>
</pre>            
</form>              
</body>           
</html>

請參閱

控制項產生器概觀 | ControlBuilderAttribute | 控制項剖析、ParseChildrenAttribute 和控制項產生器