IWebEditable 介面

定義

命名空間:

System.Web.UI.WebControls.WebParts

組件:

System.Web.dll

提供介面給開發人員，以指定與 WebPart 控制項相關聯的自訂編輯控制項。

public interface class IWebEditable

public interface IWebEditable

type IWebEditable = interface

Public Interface IWebEditable

衍生

System.Web.UI.WebControls.WebParts.WebPart

範例

下列程式代碼範例示範如何覆寫自定義WebPart控件中介面的方法IWebEditable，然後在控件進入編輯模式時WebPart建立自定義EditorPart控件的實例。

此範例有四個部分：

• 自訂類別的程序代碼。

• 裝載自定義控件的網頁。

• 將頁面切換為編輯模式的使用者控制件。

• 範例在瀏覽器中運作方式的描述。

程式代碼範例的第一個部分是自定義 TextDisplayWebPart 類別。 請注意，類別衍生自 WebPart 類別並實 IWebEditable 作 介面，並提供 方法和 屬性的特定實 CreateEditorParts 作 WebBrowsableObject 。 另請注意，在類別內TextDisplayWebPart巢狀是衍生自基EditorPart類的私人自定義TextDisplayEditorPart類別。 若要執行程式碼範例，您必須編譯此原始程式碼。 您可以明確地編譯它，並將產生的元件放在網站的 Bin 資料夾或全域程式集緩存中。 或者，您也可以將原始程式碼放在月臺的 App_Code資料夾中，在運行時間會動態編譯原始程式碼。 如需示範這兩種編譯方法的逐步解說，請參閱逐步解說 ：開發和使用自定義 Web 伺服器控制件。

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Security.Permissions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public class TextDisplayWebPart : WebPart
  {
    private String _contentText = null;
    private String _fontStyle = null;
    TextBox input;
    Label DisplayContent;
    Literal lineBreak;

    public override EditorPartCollection CreateEditorParts()
    {
      ArrayList editorArray = new ArrayList();
      TextDisplayEditorPart edPart = new TextDisplayEditorPart();
      edPart.ID = this.ID + "_editorPart1";
      editorArray.Add(edPart);
      EditorPartCollection editorParts = 
        new EditorPartCollection(editorArray);
      return editorParts;
    }

    public override object WebBrowsableObject
    {
      get { return this; }
    }

    [Personalizable(), WebBrowsable]
    public String ContentText
    {
      get { return _contentText; }
      set { _contentText = value; }
    }

    [Personalizable(), WebBrowsable()]
    public String FontStyle
    {
      get { return _fontStyle; }
      set { _fontStyle = value; }
    }

    protected override void CreateChildControls()
    {
      Controls.Clear();
      DisplayContent = new Label();
      DisplayContent.BackColor = Color.LightBlue;
      DisplayContent.Text = this.ContentText;
      if (FontStyle == null)
        FontStyle = "None";
      SetFontStyle(DisplayContent, FontStyle);
      this.Controls.Add(DisplayContent);

      lineBreak = new Literal();
      lineBreak.Text = @"<br />";
      Controls.Add(lineBreak);

      input = new TextBox();
      this.Controls.Add(input);
      Button update = new Button();
      update.Text = "Set Label Content";
      update.Click += new EventHandler(this.submit_Click);
      this.Controls.Add(update);
    }

    private void submit_Click(object sender, EventArgs e)
    {
      // Update the label string.
      if (!string.IsNullOrEmpty(input.Text))
      {
        _contentText = input.Text + @"<br />";
        input.Text = String.Empty;
        DisplayContent.Text = this.ContentText;
      }
    }

    private void SetFontStyle(Label label, String selectedStyle)
    {
      if (selectedStyle == "Bold")
      {
        label.Font.Bold = true;
        label.Font.Italic = false;
        label.Font.Underline = false;
      }
      else if (selectedStyle == "Italic")
      {
        label.Font.Italic = true;
        label.Font.Bold = false;
        label.Font.Underline = false;
      }
      else if (selectedStyle == "Underline")
      {
        label.Font.Underline = true;
        label.Font.Bold = false;
        label.Font.Italic = false;
      }
      else
      {
        label.Font.Bold = false;
        label.Font.Italic = false;
        label.Font.Underline = false;
      }
    }

    // Create a custom EditorPart to edit the WebPart control.
    [AspNetHostingPermission(SecurityAction.Demand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    private class TextDisplayEditorPart : EditorPart
    {
      DropDownList _partContentFontStyle;

      public override bool ApplyChanges()
      {
        TextDisplayWebPart part = 
          (TextDisplayWebPart)WebPartToEdit;
        // Update the custom WebPart control with the font style.
        part.FontStyle = PartContentFontStyle.SelectedValue;

        return true;
      }

      public override void SyncChanges()
      {
        TextDisplayWebPart part = 
          (TextDisplayWebPart)WebPartToEdit;
        String currentStyle = part.FontStyle;

        // Select the current font style in the drop-down control.
        foreach (ListItem item in PartContentFontStyle.Items)
        {
          if (item.Value == currentStyle)
          {
            item.Selected = true;
            break;
          }
        }
      }

      protected override void CreateChildControls()
      {
        Controls.Clear();

        // Add a set of font styles to the dropdown list.
        _partContentFontStyle = new DropDownList();
        _partContentFontStyle.Items.Add("Bold");
        _partContentFontStyle.Items.Add("Italic");
        _partContentFontStyle.Items.Add("Underline");
        _partContentFontStyle.Items.Add("None");

        Controls.Add(_partContentFontStyle);
      }

      protected override void RenderContents(HtmlTextWriter writer)
      {
        writer.Write("<b>Text Content Font Style</b>");
        writer.WriteBreak();
        writer.Write("Select a font style.");
        writer.WriteBreak();
        _partContentFontStyle.RenderControl(writer);
        writer.WriteBreak();
      }

      // Access the drop-down control through a property.
      private DropDownList PartContentFontStyle
      {
        get 
        {
          EnsureChildControls();
          return _partContentFontStyle;
        }
      }
    }
  }
}

Imports System.Collections
Imports System.ComponentModel
Imports System.Drawing
Imports System.Security.Permissions
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts

Namespace Samples.AspNet.VB.Controls
  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class TextDisplayWebPart
    Inherits WebPart
    Private _contentText As String = Nothing
    Private _fontStyle As String = Nothing
    Private input As TextBox
    Private DisplayContent As Label
    Private lineBreak As Literal

    Public Overrides Function CreateEditorParts() _
                                As EditorPartCollection
      Dim editorArray As New ArrayList()
      Dim edPart as New TextDisplayEditorPart()
      edPart.ID = Me.ID & "_editorPart1"
      editorArray.Add(edPart)
      Dim editorParts As New EditorPartCollection(editorArray)
      Return editorParts

    End Function

    Public Overrides ReadOnly Property WebBrowsableObject() _
                                        As Object
      Get
        Return Me
      End Get
    End Property

    <Personalizable(), WebBrowsable()> _
    Public Property ContentText() As String
      Get
        Return _contentText
      End Get
      Set(ByVal value As String)
        _contentText = Value
      End Set
    End Property

    <Personalizable(), WebBrowsable()> _
    Public Property FontStyle() As String
      Get
        Return _fontStyle
      End Get
      Set(ByVal value As String)
        _fontStyle = Value
      End Set
    End Property

    Protected Overrides Sub CreateChildControls()
      Controls.Clear()
      DisplayContent = New Label()
      DisplayContent.BackColor = Color.LightBlue
      DisplayContent.Text = Me.ContentText
      If FontStyle Is Nothing Then
        FontStyle = "None"
      End If
      SetFontStyle(DisplayContent, FontStyle)
      Me.Controls.Add(DisplayContent)

      lineBreak = New Literal()
      lineBreak.Text = "<br />"
      Controls.Add(lineBreak)

      input = New TextBox()
      Me.Controls.Add(input)
      Dim update As New Button()
      update.Text = "Set Label Content"
      AddHandler update.Click, AddressOf Me.submit_Click
      Me.Controls.Add(update)

    End Sub

    Private Sub submit_Click(ByVal sender As Object, _
                             ByVal e As EventArgs)
      ' Update the label string.
      If input.Text <> String.Empty Then
        _contentText = input.Text + "<br />"
        input.Text = String.Empty
        DisplayContent.Text = Me.ContentText
      End If

    End Sub

    Private Sub SetFontStyle(ByVal label As Label, _
                             ByVal selectedStyle As String)
      If selectedStyle = "Bold" Then
        label.Font.Bold = True
        label.Font.Italic = False
        label.Font.Underline = False
      ElseIf selectedStyle = "Italic" Then
        label.Font.Italic = True
        label.Font.Bold = False
        label.Font.Underline = False
      ElseIf selectedStyle = "Underline" Then
        label.Font.Underline = True
        label.Font.Bold = False
        label.Font.Italic = False
      Else
        label.Font.Bold = False
        label.Font.Italic = False
        label.Font.Underline = False
      End If

    End Sub

    ' Create a custom EditorPart to edit the WebPart control.
    <AspNetHostingPermission(SecurityAction.Demand, _
      Level:=AspNetHostingPermissionLevel.Minimal)> _
    Private Class TextDisplayEditorPart
      Inherits EditorPart
      Private _partContentFontStyle As DropDownList

      Public Overrides Function ApplyChanges() As Boolean
        Dim part As TextDisplayWebPart = CType(WebPartToEdit, _
                                               TextDisplayWebPart)
        ' Update the custom WebPart control with the font style.
        part.FontStyle = PartContentFontStyle.SelectedValue

        Return True

      End Function

      Public Overrides Sub SyncChanges()
        Dim part As TextDisplayWebPart = CType(WebPartToEdit, _
                                               TextDisplayWebPart)
        Dim currentStyle As String = part.FontStyle

        ' Select the current font style in the drop-down control.
        Dim item As ListItem
        For Each item In PartContentFontStyle.Items
          If item.Value = currentStyle Then
            item.Selected = True
            Exit For
          End If
        Next item

      End Sub

      Protected Overrides Sub CreateChildControls()
        Controls.Clear()

        ' Add a set of font styles to the dropdown list.
        _partContentFontStyle = New DropDownList()
        _partContentFontStyle.Items.Add("Bold")
        _partContentFontStyle.Items.Add("Italic")
        _partContentFontStyle.Items.Add("Underline")
        _partContentFontStyle.Items.Add("None")

        Controls.Add(_partContentFontStyle)

      End Sub

      Protected Overrides Sub RenderContents(ByVal writer _
                                             As HtmlTextWriter)
        writer.Write("<b>Text Content Font Style</b>")
        writer.WriteBreak()
        writer.Write("Select a font style.")
        writer.WriteBreak()
        _partContentFontStyle.RenderControl(writer)
        writer.WriteBreak()

      End Sub

      ' Access the drop-down control through a property.
      Private ReadOnly Property PartContentFontStyle() As DropDownList
        Get
          EnsureChildControls()
          Return _partContentFontStyle
        End Get
      End Property

    End Class

  End Class

End Namespace

程式代碼範例的第二個部分是裝載自定義控件的網頁。 請注意，雖然 EditorZone 控件是在頁面的標記中宣告，但自定義 EditorPart 控件不需要在該處參考，因為它可以在運行時間以程序設計方式新增。

<%@ page language="c#" %>
<%@ register TagPrefix="uc1" 
  TagName="DisplayModeUC" 
  Src="DisplayModeUCcs.ascx" %>
<%@ register tagprefix="aspSample" 
  Namespace="Samples.AspNet.CS.Controls" 
  Assembly="TextDisplayWebPartCS" %>

<!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 runat="server">
    <title>
      Text Display WebPart with EditorPart
    </title>
  </head>
  <body>
    <form id="form1" runat="server">
      <asp:webpartmanager id="WebPartManager1" runat="server" />
      <uc1:DisplayModeUC ID="DisplayModeUC1" runat="server" />
      <asp:webpartzone id="zone1" runat="server" 
        CloseVerb-Enabled="false">
        <zonetemplate>
          <aspSample:TextDisplayWebPart 
            runat="server"   
            id="textwebpart" 
            title = "Text Content WebPart" /> 
        </zonetemplate>
      </asp:webpartzone> 
      <asp:EditorZone ID="EditorZone1" runat="server" /> 
    </form>
  </body>
</html>

<%@ page language="vb" %>
<%@ register TagPrefix="uc1" 
  TagName="DisplayModeUC" 
  Src="DisplayModeUCvb.ascx" %>
<%@ register tagprefix="aspSample" 
  Namespace="Samples.AspNet.VB.Controls" 
  Assembly="TextDisplayWebPartVB" %>

<!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 runat="server">
    <title>
      Text Display WebPart with EditorPart
    </title>
  </head>
  <body>
    <form id="form1" runat="server">
      <asp:webpartmanager id="WebPartManager1" runat="server" />
      <uc1:DisplayModeUC ID="DisplayModeUC1" runat="server" />
      <asp:webpartzone id="zone1" runat="server" 
        CloseVerb-Enabled="false">
        <zonetemplate>
          <aspSample:TextDisplayWebPart 
            runat="server"   
            id="textwebpart" 
            title = "Text Content WebPart" />
        </zonetemplate>
      </asp:webpartzone> 
      <asp:EditorZone ID="EditorZone1" runat="server" /> 
    </form>
  </body>
</html>

程式代碼範例的第三個部分是使用者控件，可讓使用者將頁面切換為編輯模式。 請注意，主控網頁中會參考使用者控件。 如需如何建立此使用者控件的完整描述，請參閱逐步解說 ：變更網頁元件頁面上的顯示模式。

<%@ control language="C#" classname="DisplayModeMenu"%>

<script runat="server">

  // On initial load, fill the dropdown with display modes.
  void DisplayModeDropdown_Load(object sender, System.EventArgs e)
  {
    if (!IsPostBack)
    {
      WebPartManager mgr = 
        WebPartManager.GetCurrentWebPartManager(Page);
      String browseModeName = WebPartManager.BrowseDisplayMode.Name;
      // Use a sorted list so the modes are sorted alphabetically.
      SortedList itemArray = 
        new SortedList(mgr.SupportedDisplayModes.Count);

      // Add display modes only if they are supported on the page.
      foreach (WebPartDisplayMode mode in mgr.SupportedDisplayModes)
      {
        String modeName = mode.Name;
        itemArray.Add(modeName, modeName + " Mode");      
      }
      // Fill the dropdown with the display mode names.
      foreach(DictionaryEntry arrayItem in itemArray)
      {
        ListItem item = new ListItem(arrayItem.Value.ToString(), 
          arrayItem.Key.ToString());
        if (item.Value == browseModeName)
          item.Selected = true;
        DisplayModeDropdown.Items.Add(item);
      }
    }
  }

  // Change the page to the selected display mode.
  void DisplayModeDropdown_SelectedIndexChanged(object sender, 
    EventArgs e)
  {
    WebPartManager mgr = WebPartManager.GetCurrentWebPartManager(Page);
    String selectedMode = DisplayModeDropdown.SelectedValue;

    foreach (WebPartDisplayMode mode in mgr.SupportedDisplayModes)
    {
      if (selectedMode == mode.Name)
      {
        mgr.DisplayMode = mode;
        break;
      }
    }
  }

</script>
<div>
  <asp:DropDownList ID="DisplayModeDropdown" 
    runat="server" 
    AutoPostBack="true" 
    OnLoad="DisplayModeDropdown_Load" 
    OnSelectedIndexChanged="DisplayModeDropdown_SelectedIndexChanged" />
</div>

<%@ control language="vb" classname="DisplayModeMenu"%>

<script runat="server">

 ' On initial load, fill the dropdown with display modes.
  Sub DisplayModeDropdown_Load(ByVal sender As Object, _
                               ByVal e As System.EventArgs)
    If Not IsPostBack Then
      Dim mgr As WebPartManager = _
        WebPartManager.GetCurrentWebPartManager(Page)
      Dim browseModeName As String = _
        WebPartManager.BrowseDisplayMode.Name
      ' Use a sorted list so the modes are sorted alphabetically.
      Dim itemArray As New SortedList(mgr.SupportedDisplayModes.Count)
        
      ' Add display modes only if they are supported on the page.
      Dim mode As WebPartDisplayMode
      For Each mode In mgr.SupportedDisplayModes
        Dim modeName As String = mode.Name
        itemArray.Add(modeName, modeName + " Mode")
      Next mode
      ' Fill the dropdown with the display mode names.
      Dim arrayItem As DictionaryEntry
      For Each arrayItem In itemArray
        Dim item As New ListItem(arrayItem.Value.ToString(), _
                                 arrayItem.Key.ToString())
        If item.Value = browseModeName Then
          item.Selected = True
        End If
        DisplayModeDropdown.Items.Add(item)
      Next arrayItem
    End If

  End Sub


' Change the page to the selected display mode.
  Sub DisplayModeDropdown_SelectedIndexChanged(ByVal sender As Object, _
                                               ByVal e As EventArgs)
    Dim mgr As WebPartManager = _
      WebPartManager.GetCurrentWebPartManager(Page)
    Dim selectedMode As String = DisplayModeDropdown.SelectedValue
    
    Dim mode As WebPartDisplayMode
    For Each mode In mgr.SupportedDisplayModes
      If selectedMode = mode.Name Then
        mgr.DisplayMode = mode
        Exit For
      End If
    Next mode

  End Sub

</script>
<div>
  <asp:DropDownList ID="DisplayModeDropdown" 
    runat="server" 
    AutoPostBack="true" 
    OnLoad="DisplayModeDropdown_Load" 
    OnSelectedIndexChanged="DisplayModeDropdown_SelectedIndexChanged" />
</div>

若要執行程式代碼範例，請在瀏覽器中載入主控網頁、將一些文字新增至文本框，然後按兩下 [ 設定卷標內容 ] 按鈕以更新控件中的標籤。 若要將頁面切換為編輯模式，請從包含顯示模式的下拉式清單中選取 [ 編輯 ]。 若要從自定義 TextDisplayEditorPart 控件顯示UI，請單擊控件上的 TextDisplayWebPart 動詞功能表下拉功能表下拉式箭號，然後選取 [ 編輯]。 在編輯 UI 中，您可以使用包含字型樣式的下拉式清單來更新控件中標籤的 TextDisplayWebPart 文字樣式。 您必須在顯示模式下拉式清單中按兩下 [流覽模式 ]，才能將頁面傳回一般檢視，並確認標籤中的文字現在具有您在編輯模式中選取的字型樣式。

備註

介面 IWebEditable 可讓您將自定義 EditorPart 控件與伺服器控制件產生關聯，例如 WebPart 控件、使用者控制項或自定義伺服器控制件。 控件 EditorPart 包含在 EditorZone 控件中，而且這個區域具有其編輯控件，可為使用者提供使用者介面 (UI) ，以修改相關聯 WebPart 控件的屬性、外觀和行為。

介面 IWebEditable 包含兩個公開的成員。 屬性 WebBrowsableObject 提供一種方式， EditorPart 讓控件取得相關聯伺服器控件的參考。 方法 CreateEditorParts 可用來建立與伺服器控件相關聯的每個自定義 EditorPart 控件實例，並將其傳回為集合。

介面已在基WebPart類上實作，不過根據預設，此IWebEditable實作不會將任何自定義EditorPart控件與 WebPart 類別產生關聯。 若要建立衍生 WebPart 控件與自定義 EditorPart 控件的關聯，您可以覆寫 CreateEditorParts 方法。

給實施者的注意事項

如果您想要使用不是 WebPart Web 元件應用程式中控制項的伺服器控制件， (也就是說，如果您將這些控制項新增至 WebPartZoneBase 區域) ，而且如果您想要將自定義 EditorPart 控件與這類伺服器控制件產生關聯，則需要實 IWebEditable 作 介面。 WebPart衍生的控件不應該實作 介面，因為基WebPart類已經這麼做。

屬性

WebBrowsableObject

取得 WebPart 控制項、使用者控制項或自訂控制項的參考，這項參考將會由 EditorPart 控制項進行編輯。

方法

CreateEditorParts()

傳回與伺服器控制項相關聯之自訂 EditorPart 控制項的集合，該伺服器控制項會實作 IWebEditable 介面。

另請參閱

• EditorPart
• ASP.NET 網頁元件控制件