WebPartConnection.IsStatic Properti

Referensi

Definisi

Ruang nama:: System.Web.UI.WebControls.WebParts

Rakitan:: System.Web.dll

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 WebPartConnection objek dideklarasikan dalam markup halaman Web, atau dibuat secara terprogram.

public:
 property bool IsStatic { bool get(); };

[System.ComponentModel.Browsable(false)]
public bool IsStatic { get; }

[<System.ComponentModel.Browsable(false)>]
member this.IsStatic : bool

Public ReadOnly Property IsStatic As Boolean

Nilai Properti

Boolean

true jika koneksi statis; jika tidak, false.

Atribut: BrowsableAttribute

Contoh

Contoh kode berikut menunjukkan penggunaan terprogram properti IsStatic .

Contoh kode memiliki tiga bagian:

Kode sumber untuk antarmuka dan dua WebPart kontrol yang bertindak sebagai penyedia dan konsumen untuk koneksi.
Halaman Web untuk menghosting kontrol dan menjalankan contoh kode.
Penjelasan tentang cara menjalankan halaman contoh.

Bagian pertama dari contoh kode adalah kode sumber untuk antarmuka, dan kontrol konsumen dan penyedia. Agar contoh kode berjalan, Anda harus mengkompilasi kode sumber ini. Anda dapat mengkompilasinya secara eksplisit dan meletakkan rakitan yang dihasilkan di folder Bin situs Web Anda atau cache perakitan global. Atau, Anda dapat meletakkan kode sumber di folder App_Code situs Anda, di mana kode tersebut akan dikompilasi secara dinamis pada durasi. Contoh kode ini menggunakan kompilasi dinamis. Untuk panduan yang menunjukkan cara mengkompilasi, lihat Panduan: Mengembangkan dan Menggunakan Kontrol Server Web Kustom.

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 Provider", "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 Consumer", "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 Provider", "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 Consumer", "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

Bagian kedua dari contoh kode adalah halaman Web. Di dekat bagian atas adalah Register arahan yang mengacu pada kode sumber untuk dua kontrol yang dikompilasi WebPart secara dinamis. Koneksi statis dideklarasikan dalam <StaticConnections> elemen pada halaman. Metode Button1_Click mengakses IsStatic properti untuk memeriksa apakah koneksi statis.

<%@ Page Language="C#" %>
<%@ 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)
  {
    WebPartConnection conn = mgr.StaticConnections[0];
    
    if (conn.IsStatic)
      lbl2.Text = "The connection is static.";
  }

</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>
      <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="Connection Details" 
        OnClick="Button1_Click" />
      <br />
      <asp:Label ID="lbl2" runat="server" />
    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>
<%@ 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 conn As WebPartConnection = mgr.StaticConnections(0)
    
    If conn.IsStatic Then
      lbl2.Text = "The connection is static."
    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" >
        <StaticConnections>
          <asp:WebPartConnection ID="conn1"
            ConsumerConnectionPointID="ZipCodeConsumer"
            ConsumerID="weather1" 
            ProviderConnectionPointID="ZipCodeProvider" 
            ProviderID="zip1" />
        </StaticConnections>      
      </asp:WebPartManager>
      <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="Connection Details" 
        OnClick="Button1_Click" />
      <br />
      <asp:Label ID="lbl2" runat="server" />
    </div>
    </form>
</body>
</html>

Muat halaman di browser. Koneksi statis sudah dibuat. Masukkan beberapa teks dalam kontrol penyedia, dan perhatikan bahwa teks ditampilkan dalam kontrol konsumen. Klik tombol Detail Koneksi untuk menampilkan nilai IsStatic properti.

Keterangan

Koneksi antar kontrol Bagian Web bisa statis atau dinamis. Koneksi statis dideklarasikan dalam markup halaman Web, menggunakan <asp:WebPartConnection> elemen . Koneksi dinamis dibuat secara terprogram atau ketika pengguna membuat koneksi melalui antarmuka pengguna (UI) yang ditentukan oleh ConnectionsZone kontrol.

Koneksi statis adalah objek bersama, yang berarti tersedia untuk semua pengguna halaman Web. Selain itu, mereka pada dasarnya permanen karena, seperti kontrol statis WebPart , mereka tidak dapat dihapus secara permanen.

Catatan

Meskipun objek koneksi statis tidak dapat dihapus secara permanen, objek tersebut dapat terputus secara permanen. Dalam hal ini, objek yang terputus akan ada di server, tetapi pengguna akhir tidak akan pernah mengetahui keberadaan objek di halaman.

Berlaku untuk

Bagikan melalui