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ITemplate 介面

定義

定義子控制項填入樣板化 ASP.NET 伺服器控制項的行為。 子控制項表示網頁上定義的內嵌樣板。

public interface class ITemplate
public interface ITemplate
type ITemplate = interface
Public Interface ITemplate
衍生

範例

下列程式碼範例示範使用 介面建立樣板化屬性的簡單樣板化伺服器控制項 ITemplate

using System;
using System.Web;
using System.Web.UI;

namespace TemplateControlSamples {

    public class TemplateItem : Control, INamingContainer {
        private String     _message         = null;

        public TemplateItem(String message) {
            _message = message;
        }

        public String Message {

           get {
              return _message;
           }
           set {
              _message = value;
           }
        }
    }

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
    [ParseChildren(true)]
    public class Template1 : Control, INamingContainer {

        private ITemplate  _messageTemplate = null;
        private String     _message         = null;

        public String Message {

           get {
              return _message;
           }
           set {
              _message = value;
           }
        }

        [
            PersistenceMode(PersistenceMode.InnerProperty),
            TemplateContainer(typeof(TemplateItem))
        ]
        public ITemplate MessageTemplate {
           get {
              return _messageTemplate;
           }
           set {
              _messageTemplate = value;
           }
        }

        protected override void CreateChildControls() {

           // If a template has been specified, use it to create children.
           // Otherwise, create a single LiteralControl with the message value.

           if (MessageTemplate != null) {
              Controls.Clear();
              TemplateItem i = new TemplateItem(this.Message);
              MessageTemplate.InstantiateIn(i);
              Controls.Add(i);
           }
           else {
              this.Controls.Add(new LiteralControl(this.Message));
           }
        }
    }
}
Imports System.Web
Imports System.Web.UI

Namespace TemplateControlSamplesVB

    Public Class TemplateItem
        Inherits Control
        Implements INamingContainer

        Private _message As String = Nothing

        Public Sub New(Message As String)
            _message = message
        End Sub

        Public Property Message As String
           Get
              Return _message
           End Get
           Set
              _message = Value
           End Set
        End Property
    End Class
    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust"), _
    ParseChildren(true)> _
    Public Class Template1VB
        Inherits Control
        Implements INamingContainer

        Private _messageTemplate As ITemplate = Nothing
        Private _message As String = Nothing

        Public Property Message As String

           Get
              Return _message
           End Get
           Set
              _message = Value
           End Set
        End Property

        <TemplateContainer(GetType(TemplateItem))> _
        Public Property MessageTemplate As ITemplate

           Get
              Return _messageTemplate
           End Get
           Set
              _messageTemplate = Value
           End Set
        End Property

        Protected Overrides Sub CreateChildControls()

           ' If a template has been specified, use it to create children.
           ' Otherwise, create a single LiteralControl with the message value.

           If Not (MessageTemplate Is Nothing)
              Controls.Clear()
              Dim I As New TemplateItem(Me.Message)
              MessageTemplate.InstantiateIn(I)
              Controls.Add(I)
           Else
              Me.Controls.Add(New LiteralControl(Me.Message))
           End If
        End Sub

    End Class

End Namespace

備註

自訂伺服器控制項會使用此介面,但絕對不會由它們實作。 ASP.NET 一律會實作它。

方法

InstantiateIn(Control)

當類別實作時,定義子控制項和樣板所屬的 Control 物件。 這些子控制項依次定義在內嵌樣板內。

適用於

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