ConnectionPoint.AllowsMultipleConnections Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan nilai yang menunjukkan apakah titik koneksi mendukung beberapa koneksi simultan.
public:
property bool AllowsMultipleConnections { bool get(); };
public bool AllowsMultipleConnections { get; }
member this.AllowsMultipleConnections : bool
Public ReadOnly Property AllowsMultipleConnections As Boolean
Nilai Properti
true
jika titik koneksi mendukung beberapa koneksi; jika tidak, false
.
Contoh
Contoh kode berikut menunjukkan penggunaan AllowsMultipleConnections properti pada ProviderConnectionPoint objek dan ConsumerConnectionPoint . Contoh kode ini hanya memperlihatkan halaman Web yang berisi kode untuk mengakses properti; untuk kode lengkap yang diperlukan untuk menjalankan contoh, lihat bagian Contoh dari ConnectionPoint gambaran umum kelas.
Kode dalam Button2_Click
metode halaman Web mengakses AllowsMultipleConnections properti pada setiap objek titik koneksi dan menulis setiap nilai ke label. Jalankan kode dengan mengklik tombol Detail Titik Koneksi setelah halaman dimuat di browser.
<%@ 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>
Keterangan
ProviderConnectionPoint objek memiliki nilai propertinya AllowsMultipleConnections yang diatur ke true
(oleh ConnectionProviderAttribute kelas ), karena kontrol Bagian Web yang diatur secara default memungkinkan titik koneksi penyedia untuk membentuk koneksi ke beberapa konsumen.
Sebaliknya, ConsumerConnectionPoint objek memiliki nilai propertinya AllowsMultipleConnections yang diatur ke false
(oleh ConnectionConsumerAttribute kelas) karena kontrol Bagian Web yang diatur secara default memungkinkan titik koneksi konsumen untuk membuat koneksi hanya ke satu penyedia pada satu waktu.
Anda dapat mengubah perilaku default mengenai beberapa koneksi dengan menetapkan nilai yang berbeda ke ConnectionProviderAttribute.AllowsMultipleConnections properti (untuk penyedia) atau ConnectionConsumerAttribute.AllowsMultipleConnections properti (untuk konsumen) pada dua Attribute kelas yang digunakan untuk atribut koneksi. Jika Anda mengaktifkan titik koneksi konsumen untuk terhubung ke beberapa penyedia secara bersamaan, kode Anda harus menangani masalah sinkronisasi yang dihasilkan.
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