IWebEditable 介面

  • 參考

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

範例

下列程式碼範例示範如何在自訂 WebPart 控制項中覆寫 介面的方法 IWebEditable ，然後在控制項進入編輯模式時 WebPart 建立自訂 EditorPart 控制項的實例。

此範例有四個部分：

  • 自訂類別的程式碼。

  • 裝載自訂控制項的網頁。

  • 將頁面切換為編輯模式的使用者控制項。

  • 範例在瀏覽器中運作方式的描述。

程式碼範例的第一個部分是自訂 TextDisplayWebPart 類別。 請注意，類別衍生自 WebPart 類別，並實 IWebEditable 作 介面，提供方法和 WebBrowsableObject 屬性的特定實作 CreateEditorParts 。 另請注意，在 類別內 TextDisplayWebPart 巢狀是衍生自基 EditorPart 類的私用自訂 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 資料夾或全域組件快取中。 或者，您可以將原始程式碼放在月臺的 App_Code 資料夾中，其將在執行時間動態編譯。 如需示範這兩種編譯方法的逐步解說，請參閱逐步解說 ：開發和使用自訂 Web 服務器控制項。

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

程式碼範例的第二個部分是裝載自訂控制項的網頁。 請注意，雖然 EditorZone 控制項是在頁面的標記中宣告，但是 EditorPart 自訂控制項不需要在該處參考，因為它可以在執行時間以程式設計方式新增。

<%@ 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>

程式碼範例的第三個部分是使用者控制項，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制項。 如需如何建立此使用者控制項的完整描述，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>

若要執行程式碼範例，請在瀏覽器中載入主控網頁、將一些文字新增至文字方塊，然後按一下 [ 設定標籤內容 ] 按鈕以更新控制項中的標籤。 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 ]。 若要從自訂 TextDisplayEditorPart 控制項顯示 UI，請按一下控制項上的 TextDisplayWebPart 動詞功能表下拉式箭號，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制項中標籤的 TextDisplayWebPart 文字樣式。 您必須在顯示模式下拉式清單中按一下 [瀏覽模式 ]，才能將頁面傳回正常檢視，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 可讓您將自訂 EditorPart 控制項與伺服器控制項產生關聯，例如 WebPart 控制項、使用者控制項或自訂伺服器控制項。 控制項 EditorPart 包含在 EditorZone 控制項中，而這個區域及其編輯控制項可為使用者提供使用者介面 (UI) ，以修改相關聯 WebPart 控制項的屬性、外觀和行為。

介面 IWebEditable 包含兩個公開的成員。 WebBrowsableObject屬性可讓您讓 EditorPart 控制項取得相關聯伺服器控制項的參考。 方法 CreateEditorParts 可用來建立與伺服器控制項相關聯之每個自訂 EditorPart 控制項的實例，並將它們當做集合傳回。

介面 IWebEditable 已在基 WebPart 類上實作，但根據預設，此實作不會將任何自訂 EditorPart 控制項與 WebPart 類別產生關聯。 若要將衍生控制項 WebPart 與自訂 EditorPart 控制項產生關聯，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項， (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訂 EditorPart 控制項與這類伺服器控制項產生關聯，則需要實作 IWebEditable 介面。 WebPart衍生控制項不應該實作 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。

適用於

另請參閱