ConstructorNeedsTagAttribute Konstruktoren

Definition

Namespace:

System.Web.UI

Assembly:

System.Web.dll

Initialisiert eine neue Instanz der ConstructorNeedsTagAttribute-Klasse.

Überlädt

ConstructorNeedsTagAttribute()	Initialisiert eine neue Instanz der ConstructorNeedsTagAttribute-Klasse.
ConstructorNeedsTagAttribute(Boolean)	Initialisiert eine neue Instanz der ConstructorNeedsTagAttribute-Klasse.

ConstructorNeedsTagAttribute()

Initialisiert eine neue Instanz der ConstructorNeedsTagAttribute-Klasse.

public:
 ConstructorNeedsTagAttribute();

public ConstructorNeedsTagAttribute ();

Public Sub New ()

Beispiele

 // Attach the ConstructorNeedsTagAttribute to the custom
 // SimpleControl, which is derived from WebControl. When
 // this version of the constructor is used, the NeedsTag
 // property is automatically set to false; therefore,
 // this class does not need a tag attribute.
 [ConstructorNeedsTagAttribute()] 
 [AspNetHostingPermission(SecurityAction.Demand, 
     Level=AspNetHostingPermissionLevel.Minimal)]
 public sealed class SimpleControl : WebControl 
 {
 
      private String UserMessage=null;
 
      // Create a property named ControlValue.
      public String ControlValue 
      {
         get 
         {
            return UserMessage;
         }
         set 
         {
            UserMessage = value;
         }
       }
             
      protected override void Render(HtmlTextWriter output) 
      {
        output.Write("Testing the ConstructorNeedsTagAttribute class.");
     }
}

' Attach the ConstructorNeedsTagAttribute to the custom
' SimpleControl, which is derived from WebControl. When
' this version of the constructor is used, the NeedsTag
' property is automatically set to false; therefore,
' this class does not need a tag attribute.
<ConstructorNeedsTagAttribute()>  _
<AspNetHostingPermission(SecurityAction.Demand, _
   Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class SimpleControl
   Inherits WebControl
   
   Private UserMessage As [String] = Nothing
   
   ' Create a property named ControlValue.
   
   Public Property ControlValue() As [String]
      Get
         Return UserMessage
      End Get
      Set
         UserMessage = value
      End Set
   End Property
   
   
   Protected Overrides Sub Render(output As HtmlTextWriter)
      output.Write("Testing the ConstructorNeedsTagAttribute class.")
   End Sub
 End Class

Siehe auch

• Attribute

ConstructorNeedsTagAttribute(Boolean)

Initialisiert eine neue Instanz der ConstructorNeedsTagAttribute-Klasse.

public:
 ConstructorNeedsTagAttribute(bool needsTag);

public ConstructorNeedsTagAttribute (bool needsTag);

new System.Web.UI.ConstructorNeedsTagAttribute : bool -> System.Web.UI.ConstructorNeedsTagAttribute

Public Sub New (needsTag As Boolean)

Parameter

needsTag

Boolean

true, um einem Steuerelement ein Tag hinzuzufügen, andernfalls false.

Beispiele

Im folgenden Codebeispiel wird ein einfaches benutzerdefiniertes Steuerelement erstellt, dessen Tagname zur Laufzeit definiert ist. Nachfolgend sehen Sie die Befehlszeile, die zum Erstellen der ausführbaren Datei verwendet wird.

vbc /r:System.dll /r:System.Web.dll /t:library /out:myWebAppPath/Bin/vb_myconstructorNeedsTagAtt.dll constructNeedsTagAtt.vb  

csc /t:library /out:myWebAppPath/Bin/cs_myConstructorNeedsTagAtt.dll constructorNeedsTagAtt.cs  

/* File Name: constructorneedstagatt.cs. */

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace MyUserControl 
{
  // Attach the 'ConstructorNeedsTagAttribute' to 'Simple' class. 
  [ConstructorNeedsTagAttribute(true)]
  public class Simple : WebControl 
  {
    private String NameTag = "";

    public Simple(String tag)
    {
      this.NameTag = tag;
    } 
 
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
    protected override void Render(HtmlTextWriter output) 
    {
      output.Write("<br>The TagName used for the 'Simple' control is "+"'"+NameTag+"'");
    }
  }  
}

' File name: constructorneedstagatt.cs. 

Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.ComponentModel


Namespace MyUserControl
   <ConstructorNeedsTagAttribute(True)>  _
   Public Class Simple
      Inherits WebControl
      Private NameTag As [String] = ""
      
      Public Sub New(tag As [String])
        Me.NameTag = tag
      End Sub
      
      <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
      Protected Overrides Sub Render(output As HtmlTextWriter)
        output.Write(("<br>The TagName used for the 'Simple' control is " + "'" + NameTag + "'"))
      End Sub
   End Class
End Namespace 'MyUserControl

Im folgenden Codebeispiel wird das vorherige benutzerdefinierte Steuerelement verwendet. Beachten Sie, dass die in der Register Direktive angezeigten Werte die vorherige Befehlszeile widerspiegeln.

<%@ Register TagPrefix='MyCurrentUserControl' Namespace='MyUserControl' Assembly='vb_myConstructorNeedsTagAtt'%>  
 <html>  
  <body>  
  <form method="POST" runat="server">  
  <MyCurrentUserControl:Simple runat="server" />  
  </form>  
  </body>  
 </html>  

<%@ Register TagPrefix='MyCurrentUserControl' Namespace='MyUserControl' Assembly='cs_myConstructorNeedsTagAtt'%>  
 <html>  
  <body>  
  <form method="POST" runat="server">  
  <MyCurrentUserControl:Simple runat="server" />  
  </form>  
  </body>  
 </html>