WebPartManager.DisconnectWebPart(WebPart) 方法

定義

命名空間:: System.Web.UI.WebControls.WebParts

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

移除 WebPart 正在關閉或刪除的伺服器控制，從其參與的任何連線中移除。

protected:
 virtual void DisconnectWebPart(System::Web::UI::WebControls::WebParts::WebPart ^ webPart);

protected virtual void DisconnectWebPart(System.Web.UI.WebControls.WebParts.WebPart webPart);

abstract member DisconnectWebPart : System.Web.UI.WebControls.WebParts.WebPart -> unit
override this.DisconnectWebPart : System.Web.UI.WebControls.WebParts.WebPart -> unit

Protected Overridable Sub DisconnectWebPart (webPart As WebPart)

參數

webPart: WebPart

一個 WebPart 必須斷開的控制。

範例

以下程式碼範例示範如何使用此 DisconnectWebPart 方法。網頁透過兩個自訂 WebPart 控制鍵，點擊按鈕即可建立控制鍵之間的連結，另一個按鈕則可解除控制鍵連接。如果你在頁面處於瀏覽模式且控制項連接時關閉其中一個控制項，覆寫 DisconnectWebPart 該方法會斷開關閉的控制項，結束連線並顯示訊息。

程式碼範例包含四個部分：

使用者控制功能可切換顯示模式。
一個包含自訂 WebPart 控制的原始碼檔案。
一個網頁來承載控制系統。
說明這個範例在瀏覽器中如何運作。

程式碼範例的第一部分是使用者控制顯示模式的設定。你可以從類別總覽的 WebPartManager 範例部分取得使用者控制的原始碼。欲了解更多顯示模式及使用者控制機制的資訊，請參閱「攻略：在網頁零件頁面更改顯示模式」。

第二部分是包含兩個 WebPart 自訂控制項原始碼的檔案，該控制項將連接，另一個自訂 WebPartManager 控制項。要執行程式碼範例，你必須編譯這個原始碼。你可以明確編譯，並將結果組合放到你網站的 Bin 資料夾或全域組合快取中。或者，你也可以把原始碼放在網站的App_Code資料夾，執行時會動態編譯。此範例使用動態編譯，因此 Register 網頁頂端會相應宣告參考這些元件的指令。如需示範編譯選項的攻略，請參見「攻略：開發與使用自訂網頁伺服器控制」。

在原始碼中，注意繼承的控制 MyWebPartManager 權會覆蓋該 DisconnectWebPart 方法。此方法檢查頁面中的每個連線，以確認關閉控制項是否參與連線，若有，則呼叫該 DisconnectWebParts 方法終止連線。這與控制中 WebPartManager 方法的基礎實作相同。覆寫後的方法會透過寫訊息到頁面來自訂基礎實作。

namespace Samples.AspNet.CS.Controls
{
  using System;
  using System.Web;
  using System.Web.Security;
  using System.Security.Permissions;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.WebControls.WebParts;

  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public interface IZipCode
  {
    string ZipCode { get; set;}
  }

  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public class ZipCodeWebPart : WebPart, IZipCode
  {
    string zipCodeText = String.Empty;
    TextBox input;
    Button send;

    public ZipCodeWebPart()
    {
    }

    // Make the implemented property personalizable to save 
    // the Zip Code between browser sessions.
    [Personalizable()]
    public virtual string ZipCode
    {
      get { return zipCodeText; }
      set { zipCodeText = value; }
    }

    // This is the callback method that returns the provider.
    [ConnectionProvider("Zip Code", "ZipCodeProvider")]
    public IZipCode ProvideIZipCode()
    {
      return this;
    }

    protected override void CreateChildControls()
    {
      Controls.Clear();
      input = new TextBox();
      this.Controls.Add(input);
      send = new Button();
      send.Text = "Enter 5-digit Zip Code";
      send.Click += new EventHandler(this.submit_Click);
      this.Controls.Add(send);
    }

    private void submit_Click(object sender, EventArgs e)
    {
      if (!string.IsNullOrEmpty(input.Text))
      {
        zipCodeText = Page.Server.HtmlEncode(input.Text);
        input.Text = String.Empty;
      }
    }
  }

  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public class WeatherWebPart : WebPart
  {
    private IZipCode _provider;
    string _zipSearch;
    Label DisplayContent;

    // This method is identified by the ConnectionConsumer 
    // attribute, and is the mechanism for connecting with 
    // the provider. 
    [ConnectionConsumer("Zip Code", "ZipCodeConsumer")]
    public void GetIZipCode(IZipCode Provider)
    {
      _provider = Provider;
    }
    
    protected override void OnPreRender(EventArgs e)
    {
      EnsureChildControls();

      if (this._provider != null)
      {
        _zipSearch = _provider.ZipCode.Trim();
        DisplayContent.Text = "My Zip Code is:  " + _zipSearch;
      }
    }

    protected override void CreateChildControls()
    {
      Controls.Clear();
      DisplayContent = new Label();
      this.Controls.Add(DisplayContent);
    }
  }
}

Imports System.Web
Imports System.Web.Security
Imports System.Security.Permissions
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 Interface IZipCode

    Property ZipCode() As String

  End Interface

  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class ZipCodeWebPart
    Inherits WebPart
    Implements IZipCode
    Private zipCodeText As String = String.Empty
    Private input As TextBox
    Private send As Button

    Public Sub New()
    End Sub

    ' Make the implemented property personalizable to save 
    ' the Zip Code between browser sessions.
    <Personalizable()> _
    Public Property ZipCode() As String _
      Implements IZipCode.ZipCode

      Get
        Return zipCodeText
      End Get
      Set(ByVal value As String)
        zipCodeText = value
      End Set
    End Property

    ' This is the callback method that returns the provider.
    <ConnectionProvider("Zip Code", "ZipCodeProvider")> _
    Public Function ProvideIZipCode() As IZipCode
      Return Me
    End Function


    Protected Overrides Sub CreateChildControls()
      Controls.Clear()
      input = New TextBox()
      Me.Controls.Add(input)
      send = New Button()
      send.Text = "Enter 5-digit Zip Code"
      AddHandler send.Click, AddressOf Me.submit_Click
      Me.Controls.Add(send)

    End Sub


    Private Sub submit_Click(ByVal sender As Object, _
      ByVal e As EventArgs)

      If input.Text <> String.Empty Then
        zipCodeText = Page.Server.HtmlEncode(input.Text)
        input.Text = String.Empty
      End If

    End Sub

  End Class

  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class WeatherWebPart
    Inherits WebPart
    Private _provider As IZipCode
    Private _zipSearch As String
    Private DisplayContent As Label

    ' This method is identified by the ConnectionConsumer 
    ' attribute, and is the mechanism for connecting with 
    ' the provider. 
    <ConnectionConsumer("Zip Code", "ZipCodeConsumer")> _
    Public Sub GetIZipCode(ByVal Provider As IZipCode)
      _provider = Provider
    End Sub


    Protected Overrides Sub OnPreRender(ByVal e As EventArgs)
      EnsureChildControls()

      If Not (Me._provider Is Nothing) Then
        _zipSearch = _provider.ZipCode.Trim()
                DisplayContent.Text = "My Zip Code is:  " + _zipSearch
      End If

    End Sub

    Protected Overrides Sub CreateChildControls()
      Controls.Clear()
      DisplayContent = New Label()
      Me.Controls.Add(DisplayContent)

    End Sub

  End Class

End Namespace

程式碼範例的第三部分是網頁。請注意，在頂部附近，包含 Register 註冊使用者控制項的指令，以及動態編譯的組件與 WebPart 控制項。這個頁面有兩種主要方法。此 Button1_Click 方法在控制裝置間建立連接，而 Button2_Click 該方法則斷開控制裝置。

<%@ Page Language="C#" %>
<%@ Register TagPrefix="uc1" 
    TagName="DisplayModeMenuCS"
    Src="~/displaymodemenucs.ascx" %>
<%@ Register TagPrefix="aspSample" 
    Namespace="Samples.AspNet.CS.Controls" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    
  protected void Button1_Click(object sender, EventArgs e)
  {
    ProviderConnectionPoint provPoint =
      mgr.GetProviderConnectionPoints(zip1)["ZipCodeProvider"];
    ConsumerConnectionPoint connPoint =
      mgr.GetConsumerConnectionPoints(weather1)["ZipCodeConsumer"];
    WebPartConnection conn1 = mgr.ConnectWebParts(zip1, provPoint,
      weather1, connPoint);
  }

  protected void Button2_Click(object sender, EventArgs e)
  {
    if (mgr.Connections.Count >= 1 && mgr.Connections[0] != null)
      mgr.DisconnectWebParts(mgr.Connections[0]);
  }
  

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:WebPartManager ID="mgr" runat="server">
      </asp:WebPartManager>
      <uc1:DisplayModeMenuCS ID="menu1" runat="server" />
      <asp:WebPartZone ID="WebPartZone1" runat="server">
        <ZoneTemplate>
          <aspSample:ZipCodeWebPart ID="zip1" runat="server"
            Title="Zip Code Provider" />
          <aspSample:WeatherWebPart ID="weather1" runat="server" 
            Title="Zip Code Consumer" />
        </ZoneTemplate>
      </asp:WebPartZone>
      <asp:ConnectionsZone ID="ConnectionsZone1" runat="server">
      </asp:ConnectionsZone>
      <asp:Button ID="Button1" runat="server" 
        Text="Connect WebPart Controls" 
        OnClick="Button1_Click" />
      <asp:Button ID="Button2" runat="server" 
        Text="Disconnect WebPart Controls" 
        OnClick="Button2_Click" />
    </div>
    </form>
</body>
</html>

<%@ Page Language="vb" %>
<%@ Register TagPrefix="uc1" 
    TagName="DisplayModeMenuVB"
    Src="~/displaymodemenuvb.ascx" %>
<%@ Register TagPrefix="aspSample" 
    Namespace="Samples.AspNet.VB.Controls" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Protected Sub Button1_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs)
    
    Dim mgr As WebPartManager = _
      WebPartManager.GetCurrentWebPartManager(Page)
    Dim provPoint As ProviderConnectionPoint = _
      mgr.GetProviderConnectionPoints(zip1)("ZipCodeProvider")
    Dim connPoint As ConsumerConnectionPoint = _
      mgr.GetConsumerConnectionPoints(weather1)("ZipCodeConsumer")
    mgr.ConnectWebParts(zip1, provPoint, weather1, connPoint)

  End Sub
  
  Protected Sub Button2_Click(ByVal sender as Object, _
    ByVal e as System.EventArgs)
    
    If mgr.Connections.Count >= 1 AndAlso _
      mgr.Connections(0) IsNot Nothing Then
      mgr.DisconnectWebParts(mgr.Connections(0))
    End If
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:WebPartManager ID="mgr" runat="server">
      </asp:WebPartManager>
      <uc1:DisplayModeMenuVB ID="menu1" runat="server" />
      <asp:WebPartZone ID="WebPartZone1" runat="server">
        <ZoneTemplate>
          <aspSample:ZipCodeWebPart ID="zip1" runat="server"
            Title="Zip Code Provider" />
          <aspSample:WeatherWebPart ID="weather1" runat="server" 
            Title="Zip Code Consumer" />
        </ZoneTemplate>
      </asp:WebPartZone>
      <asp:ConnectionsZone ID="ConnectionsZone1" runat="server">
      </asp:ConnectionsZone>
      <asp:Button ID="Button1" runat="server" 
        Text="Connect WebPart Controls" 
        OnClick="Button1_Click" />
      <asp:Button ID="Button2" runat="server" 
        Text="Disconnect WebPart Controls" 
        OnClick="Button2_Click" />
    </div>
    </form>
</body>
</html>

載入頁面後，點擊 「連接 」按鈕連接控制項。然後點選其中一個控制項的動詞選單（控制項標題中的向下箭頭），然後從動詞選單中選擇關閉。當你嘗試關閉控制項時，會呼叫覆寫的方法，連線結束，訊息會寫入頁面。如果你想重置頁面以恢復關閉控制並嘗試其他選項，請點擊 「重置使用者狀態 」連結以移除個人化資料並恢復頁面的原始狀態。

備註

DisconnectWebPart當頁面上的控制項被關閉或從頁面刪除時，Web Parts 控制集會內部呼叫此方法。在這種情況下，該方法會被呼叫，以移除任何作為消費者或提供者的連線控制。若控制項從任何連線中移除，此方法也會呼叫 DisconnectWebParts 該方法以終止涉及的任何連線 webPart 。

當 DisconnectWebPart 方法被呼叫時，事件會被 WebPartsDisconnecting 觸發。通常此活動可取消，但有兩種情況無法取消。其中一種情況發生在對頁面的請求過程中，當 ActivateConnections 該方法被呼叫時。若現有連線間存在衝突， DisconnectWebPart 將執行該方法以關閉其中一個衝突連線， WebPartsDisconnecting 此時事件無法取消，因為衝突必須解決。

另一種情況是當前 WebPart 連接的伺服器控制項被關閉或刪除。在這種情況下，由於控制項被從頁面中移除，其連線也必須終止，因此設計上無法取消 WebPartsDisconnecting 事件來中斷連線結束的過程。欲了解更多資訊，請參閱該活動。WebPartsDisconnecting

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