ConnectionPoint.GetEnabled(Control) 方法

参考

定义

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

程序集:: System.Web.dll

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。

返回一个指示连接点是否可以参与连接的值。

public:
 virtual bool GetEnabled(System::Web::UI::Control ^ control);

public virtual bool GetEnabled (System.Web.UI.Control control);

abstract member GetEnabled : System.Web.UI.Control -> bool
override this.GetEnabled : System.Web.UI.Control -> bool

Public Overridable Function GetEnabled (control As Control) As Boolean

参数

control: Control

一个与连接点关联的 WebPart 或其他服务器控件。

Boolean

如果控件可以创建连接点来参与连接，则为 true；否则为 false。

示例

下面的代码示例演示如何在 GetEnabled 和 ConsumerConnectionPoint 对象上使用 ProviderConnectionPoint 方法。此代码示例仅显示包含用于访问属性的代码的网页;有关运行示例所需的完整代码，请参阅类概述的 ConnectionPoint “示例”部分。

网页方法中的 Button2_Click 代码访问 GetEnabled 每个连接点对象上的方法，并将每个值写入标签。在浏览器中加载页面后，单击“ 连接点详细信息 ”按钮执行代码。

<%@ 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"];
      
    if(mgr.CanConnectWebParts(zip1, provPoint, weather1, connPoint))
      mgr.ConnectWebParts(zip1, provPoint, weather1, connPoint);
  
  }  
  protected void Button2_Click(object sender, EventArgs e)
  {
    WebPartConnection conn = mgr.Connections[0];
    
    lblConn.Text = "<h2>Connection Point Details</h2>" + 
       "<h3>Provider Connection Point</h3>" + 
       "  Display name: " + conn.ProviderConnectionPoint.DisplayName + 
       "<br />" + 
       "  ID: " + conn.ProviderConnectionPoint.ID + 
       "<br />" + 
       "  Interface type: " + 
        conn.ProviderConnectionPoint.InterfaceType.ToString() + 
       "<br />" + 
       "  Control type: " + conn.ProviderConnectionPoint.ControlType.ToString() + 
       "<br />" + 
       "  Allows multiple connections: " + 
          conn.ProviderConnectionPoint.AllowsMultipleConnections.ToString() + 
       "<br />" + 
       "  Enabled: " + conn.ProviderConnectionPoint.GetEnabled(zip1).ToString() + 
       "<hr />" + 
       "<h3>Consumer Connection Point</h3>" + 
       "  Display name: " + conn.ConsumerConnectionPoint.DisplayName + 
       "<br />" + 
       "  ID: " + conn.ConsumerConnectionPoint.ID + 
       "<br />" + 
       "  Interface type: " + conn.ConsumerConnectionPoint.InterfaceType.ToString() + 
       "<br />" + 
       "  Control type: " + conn.ConsumerConnectionPoint.ControlType.ToString() + 
       "<br />" + 
       "  Allows multiple connections: " + 
          conn.ConsumerConnectionPoint.AllowsMultipleConnections.ToString() + 
       "<br />" + 
       "  Enabled: " + conn.ConsumerConnectionPoint.GetEnabled(zip1).ToString();
  }

  protected void Page_Load(object sender, EventArgs e)
  {
    lblConn.Text = String.Empty;
  }
</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" >
        <StaticConnections>
          <asp:WebPartConnection ID="conn1"
            ConsumerConnectionPointID="ZipCodeConsumer"
            ConsumerID="weather1" 
            ProviderConnectionPointID="ZipCodeProvider" 
            ProviderID="zip1" />
        </StaticConnections>      
      </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="Dynamic Connection" 
        OnClick="Button1_Click" />      
      <br />
      <asp:Button ID="Button2" runat="server" 
        Text="Connection Point Details" 
        OnClick="Button2_Click" />
      <br />
      <asp:Label ID="lblConn" runat="server" />
    </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 provPoint As ProviderConnectionPoint = _
      mgr.GetProviderConnectionPoints(zip1)("ZipCodeProvider")
    Dim connPoint As ConsumerConnectionPoint = _
      mgr.GetConsumerConnectionPoints(weather1)("ZipCodeConsumer")

    If mgr.CanConnectWebParts(zip1, provPoint, weather1, connPoint) Then
      mgr.ConnectWebParts(zip1, provPoint, weather1, connPoint)
    End If
    
  End Sub
  
  Protected Sub Button2_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs)
    
    Dim conn As WebPartConnection = mgr.Connections(0)

    lblConn.Text = "<h2>Connection Point Details</h2>" & _
      "<h3>Provider Connection Point</h3>" & _
      "  Display name: " & conn.ProviderConnectionPoint.DisplayName & _
      "<br />" & _
      "  ID: " & conn.ProviderConnectionPoint.ID & _
      "<br />" & _
      "  Interface type: " & conn.ProviderConnectionPoint.InterfaceType.ToString() & _
      "<br />" & _
      "  Control type: " & conn.ProviderConnectionPoint.ControlType.ToString() & _
      "<br />" & _
      "  Allows multiple connections: " & _
        conn.ProviderConnectionPoint.AllowsMultipleConnections.ToString() & _
      "<br />" & _
      "  Enabled: " & conn.ProviderConnectionPoint.GetEnabled(zip1).ToString() & _
      "<hr />" & _
      "<h3>Consumer Connection Point</h3>" & _
      "  Display name: " & conn.ConsumerConnectionPoint.DisplayName & _
      "<br />" & _
      "  ID: " & conn.ConsumerConnectionPoint.ID & _
      "<br />" & _
      "  Interface type: " & conn.ConsumerConnectionPoint.InterfaceType.ToString() & _
      "<br />" & _
      "  Control type: " & conn.ConsumerConnectionPoint.ControlType.ToString() & _
      "<br />" & _
      "  Allows multiple connections: " & _
        conn.ConsumerConnectionPoint.AllowsMultipleConnections.ToString() & _
      "<br />" & _
      "  Enabled: " & conn.ConsumerConnectionPoint.GetEnabled(zip1).ToString()
          
  End Sub

  Protected Sub Page_Load(ByVal sender As Object, _
    ByVal e As System.EventArgs)
    lblConn.Text = String.Empty
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:WebPartManager ID="mgr" runat="server" >
        <StaticConnections>
          <asp:WebPartConnection ID="conn1"
            ConsumerConnectionPointID="ZipCodeConsumer"
            ConsumerID="weather1" 
            ProviderConnectionPointID="ZipCodeProvider" 
            ProviderID="zip1" />
        </StaticConnections>      
      </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="Dynamic Connection" 
        OnClick="Button1_Click" />      
      <br />
      <asp:Button ID="Button2" runat="server" 
        Text="Connection Point Details" 
        OnClick="Button2_Click" />
      <br />
      <asp:Label ID="lblConn" runat="server" />
    </div>
    </form>
</body>
</html>

注解

GetEnabled基ConnectionPoint类中的方法始终返回 true，但派生类可以重写方法以根据的状态control在不同的时间返回 true 或 false 。

适用于

另请参阅

ASP.NET Web 部件控件

通过

ConnectionPoint.GetEnabled(Control) 方法

定义

参数

返回

示例

注解

适用于

另请参阅

其他资源