WebPartManager.DisconnectWebParts(WebPartConnection) 方法
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
执行断开网页中连接的服务器控件的过程。
public:
virtual void DisconnectWebParts(System::Web::UI::WebControls::WebParts::WebPartConnection ^ connection);
public virtual void DisconnectWebParts (System.Web.UI.WebControls.WebParts.WebPartConnection connection);
abstract member DisconnectWebParts : System.Web.UI.WebControls.WebParts.WebPartConnection -> unit
override this.DisconnectWebParts : System.Web.UI.WebControls.WebParts.WebPartConnection -> unit
Public Overridable Sub DisconnectWebParts (connection As WebPartConnection)
参数
- connection
- WebPartConnection
表示服务器控件之间的连接的 WebPartConnection。
例外
connection
为 null
。
connection
未包含在 StaticConnections 或 DynamicConnections 中。
StaticConnections 为只读。
- 或 -
connection
已从 StaticConnections 断开。
- 或 -
DynamicConnections 为只读。
- 或 -
connection
已从 DynamicConnections 断开。
示例
下面的代码示例演示如何使用 DisconnectWebParts 方法。 使用两个自定义 WebPart 控件,网页允许你通过单击一个按钮在控件之间创建连接,而另一个按钮使你可以断开控件的连接。
该代码示例包含四个部分:
用于更改显示模式的用户控件。
包含自定义 WebPart 控件的源文件。
用于承载控件的网页。
说明示例在浏览器中的工作原理。
代码示例的第一部分是用于更改显示模式的用户控件。 可以从类概述的“示例”部分获取用户控件的 WebPartManager 源代码。 有关显示模式和用户控件工作原理的详细信息,请参阅 演练:更改 Web 部件页上的显示模式。
第二部分是一个文件,其中包含将连接的两个自定义 WebPart 控件的源代码。 若要运行代码示例,必须编译此源代码。 可以显式编译它,并将生成的程序集放入网站的 Bin 文件夹或全局程序集缓存中。 或者,可以将源代码放在站点的“App_Code”文件夹中,并在运行时对其进行动态编译。 此示例使用动态编译,因此在 Register
网页顶部相应地声明引用网页中这些组件的 指令。 有关演示编译选项的演练,请参阅 演练:开发和使用自定义 Web 服务器控件。
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
代码示例的第三部分是网页。 请注意,在顶部附近,它包含 Register
用于向控件注册用户控件和动态编译程序集的 WebPart 指令。 该页有两个主要方法。 方法 Button1_Click
在 控件之间创建连接, 方法 Button2_Click
断开控件的连接。
<%@ 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>
加载页面后,可以单击“ 连接 ”按钮来连接控件。 如果在文本框控件中输入一些文本,然后单击“ Enter ”按钮,则文本将显示在连接的控件中, (如果控件断开连接) 将不会显示该文本。 如果单击“ 断开连接 ”按钮,控件将断开连接。 可以通过使用 “显示模式 ”下拉列表控件将页面切换到 “连接 ”模式来验证控件的连接状态。 执行此操作后,单击由其中一个控件标题栏中) 箭头表示的谓词菜单 (,然后选择 “连接 ”项。 将显示连接 UI;它可用,因为页面中声明了一个 <asp:connectionszone>
元素。 还可以从此 UI 连接和断开控件的连接。
注解
方法 DisconnectWebParts 执行结束 或服务器控件之间的连接 WebPart 的完整过程,当你向其传递 connection
参数时。
此方法用于在网页中放置 <asp:connectionszone>
元素时断开控件的连接,以提供用户界面 (UI) 用于管理连接。 当页面处于连接显示模式 (ConnectDisplayMode) ,并且存在当前连接时,用户可以单击调用 DisconnectWebParts 方法的按钮以结束连接。
如果要以编程方式断开控件的连接,且无需向页面添加<asp:connectionszone>
元素,还可以直接从代码调用 DisconnectWebParts 方法。
继承者说明
如果要更改断开连接WebPart控件的默认实现,DisconnectWebParts(WebPartConnection)可以重写 方法。 如果确实重写了 方法,并且只想向现有方法添加一些实现,则可以在执行自己的代码之前调用基方法。