WebPartManager.DisconnectWebPart(WebPart) 方法

參考

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。

從控制項參與的任何連接中，移除正在關閉或刪除的 WebPart 或伺服器控制項。

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

要中斷連接的 WebPart 控制項。

範例

下列程式碼範例會示範如何使用 DisconnectWebPart 方法。使用兩個自訂 WebPart 控制項，網頁可讓您按一下按鈕來建立控制項之間的連線，而另一個按鈕可讓您中斷控制項的連接。如果您在頁面處於瀏覽模式且控制項已連接時關閉其中一個控制項，方法的 DisconnectWebPart 覆寫會中斷關閉的控制項、結束連接，並顯示訊息。

程式碼範例有四個部分：

用於變更顯示模式的使用者控制項。
包含自訂 WebPart 控制項的來源檔案。
要裝載控制項的網頁。
說明範例在瀏覽器中的運作方式。

程式碼範例的第一個部分是變更顯示模式的使用者控制項。您可以從類別概觀的 Example 區段取得使用者控制項的 WebPartManager 原始程式碼。如需顯示模式和使用者控制項運作方式的詳細資訊，請參閱逐步解說：變更網頁元件頁面上的顯示模式。

第二個部分是檔案，其中包含將連接之兩個自訂 WebPart 控制項的原始程式碼，以及自訂 WebPartManager 控制項。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。這個範例會使用動態編譯，因此 Register 參考網頁中這些元件的指示詞會據以宣告在網頁頂端。如需示範編譯選項的逐步解說，請參閱逐步解說：開發和使用自訂 Web 服務器控制項。

在原始程式碼中，請注意覆寫方法的 DisconnectWebPart 繼承控制項 MyWebPartManager 。這個方法會檢查頁面上的每個連線，以查看關閉的控制項是否參與連接，如果是的話，請呼叫 DisconnectWebParts 方法結束連接。這與控制項中 WebPartManager 方法的基底實作相同。覆寫的方法接著會藉由將訊息寫入頁面來自訂基底實作。

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

程式碼範例的第三個部分是網頁。請注意，在頂端附近，它會包含 Register 指示詞來註冊使用者控制項，以及使用 WebPart 控制項動態編譯的元件。頁面有兩個主要方法。方法 Button1_Click 會在控制項之間建立連接，而 Button2_Click 方法會中斷控制項的連接。

<%@ 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>

載入頁面之後，按一下 [ 連線 ] 按鈕以連接控制項。然後按一下其中一個控制項中的動詞功能表， (控制項標題中的向下箭號) ，然後從動詞功能表選取 [ 關閉 ]。當您嘗試關閉控制項時，會呼叫覆寫的方法、連接已結束，並將訊息寫入頁面。如果您想要重設頁面以還原關閉的控制項並實驗其他選項，請按一下 [ 重設使用者狀態 ] 連結來移除個人化資料，並還原頁面的原始狀態。

備註

DisconnectWebPart當控制項在頁面上關閉或刪除時，Web 元件控制項會在內部呼叫方法。在這類案例中，會呼叫方法，將控制項從任何與消費者或提供者相關的連接中移除。如果控制項從任何連接中移除，這個方法也會呼叫 DisconnectWebParts 方法，以結束涉及的任何連接 webPart 。

DisconnectWebPart呼叫方法時，它會引發 WebPartsDisconnecting 事件。通常可以取消此事件，但在兩種情況下無法取消。呼叫方法時，會在呼叫頁面的要求期間 ActivateConnections 發生一個案例。如果現有連線之間發生衝突， DisconnectWebPart 則會叫用方法以關閉其中一個衝突的連接，而且在此實例 WebPartsDisconnecting 中無法取消事件，因為必須解決衝突。

當目前連接的或伺服器控制項已關閉或刪除時 WebPart ，就會發生其他情況。在此情況下，由於控制項已從頁面移除，因此也必須終止其連線，因此設計無法取消 WebPartsDisconnecting 事件以中斷終止連線的程式。如需詳細資訊，請參閱 WebPartsDisconnecting 事件。

適用於

WebPartManager.DisconnectWebPart(WebPart) 方法

定義

參數

範例

備註

適用於

另請參閱

意見反應

其他資源