ControlBuilder.OnAppendToParentBuilder(ControlBuilder) Methode

Definition

Benachrichtigt den ControlBuilder, dass er dem übergeordneten Steuerelementgenerator hinzugefügt wird.Notifies the ControlBuilder that it is being added to a parent control builder.

public:
 virtual void OnAppendToParentBuilder(System::Web::UI::ControlBuilder ^ parentBuilder);
public virtual void OnAppendToParentBuilder (System.Web.UI.ControlBuilder parentBuilder);
abstract member OnAppendToParentBuilder : System.Web.UI.ControlBuilder -> unit
override this.OnAppendToParentBuilder : System.Web.UI.ControlBuilder -> unit
Public Overridable Sub OnAppendToParentBuilder (parentBuilder As ControlBuilder)

Parameter

parentBuilder
ControlBuilder

Das ControlBuilder-Objekt, dem der aktuelle Generator hinzugefügt wird.The ControlBuilder object to which the current builder is added.

Beispiele

In diesem Beispiel wird die OnAppendToParentBuilder -Methode überschrieben ControlType , um die-Eigenschaft zu überprüfen und zu bestimmen, auf welche Art von Steuerelement dieser Generator angewendetThis example overrides the OnAppendToParentBuilder method to check the ControlType property to determine what type of control this builder is applied to. Wenn es sich um CustomTextBoxeine handelt, prüft der Generator, ob der HasAspCode Wert der-Eigenschaft im-Steuerelement enthalten ist.If it is a CustomTextBox, the builder checks whether the value of the HasAspCode property is included in the control. Wenn dies der Fall ist, wird eine Ausnahme ausgelöst, HasBody wenn nicht die-Methode aufgerufen wird.If so, an exception is thrown, if not the HasBody method is called.

using System;
using System.Web.UI;
using System.Web;
using System.Security.Permissions;

namespace ASPNET.Samples
{
    [
    AspNetHostingPermission(SecurityAction.Demand,
        Level=AspNetHostingPermissionLevel.Minimal)
    ]
    public class AppendControlBuilder : ControlBuilder
    {
        // Override the OnAppendToParentBuilder method.
        public override void OnAppendToParentBuilder(ControlBuilder parentBuilder)
        {
            // Check whether the type of the control this builder
            // is applied to is CustomTextBox. If so, check whether
            // ASP code blocks exist in the control. If so, call
            // throw an Exception, if not, call the HasBody method.        
            if (ControlType == Type.GetType("CustomTextBox"))
            {
                if (HasAspCode)
                    throw new Exception("This control cannot contain code blocks.");
                else
                    HasBody();
            }
        }
    }
}
Imports System.Web.UI
Imports System.Web
Imports System.Security.Permissions

Namespace ASPNET.Samples

   <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
   Public NotInheritable Class AppendControlBuilder
      Inherits ControlBuilder

      ' Override the OnAppendToParentBuilder method.
      Overrides Public Sub OnAppendToParentBuilder( _
         ByVal parentBuilder As ControlBuilder _
      )
            ' Check whether the type of the control this builder
            ' is applied to is CustomTextBox. If so, check whether
            ' ASP code blocks exist in the control. If so, call
            ' throw an Exception, if not, call the HasBody method.        
            If ControlType Is Type.GetType("CustomTextBox") Then
                If HasAspCode = True Then
                    Throw New Exception("This control cannot contain code blocks.")
                Else
                    HasBody()
                End If
            End If

        End Sub

   End Class

End Namespace

Gilt für: