WebPartConnection.Provider 屬性

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。

取得做為 Web 組件連接之中提供者的 WebPart 控制項。

public:
 property System::Web::UI::WebControls::WebParts::WebPart ^ Provider { System::Web::UI::WebControls::WebParts::WebPart ^ get(); };

[System.ComponentModel.Browsable(false)]
public System.Web.UI.WebControls.WebParts.WebPart Provider { get; }

[<System.ComponentModel.Browsable(false)>]
member this.Provider : System.Web.UI.WebControls.WebParts.WebPart

Public ReadOnly Property Provider As WebPart

屬性值

WebPart

WebPart，做為資料提供者。

屬性: BrowsableAttribute

例外狀況

InvalidOperationException

ProviderID 屬性值的長度為零。

範例

下列程式代碼範例示範如何使用 Provider 屬性。

程式代碼範例有三個部分：

介面的原始程式碼，以及 WebPart 兩個做為連接提供者和取用者的控件。
裝載控件並執行程式碼範例的網頁。
如何執行範例頁面的說明。

程式代碼範例的第一個部分是介面的原始程式碼，以及取用者和提供者控件。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 資料夾或全域程式集緩存中。或者，您可以將原始程式碼放在月臺的 App_Code資料夾中，其將在運行時間動態編譯。此程式代碼範例會使用動態編譯。如需示範如何編譯的逐步解說，請參閱逐步解說：開發和使用自定義 Web 伺服器控制件。

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 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

程式代碼範例的第二個部分是網頁。靠近頂端的指示詞是指兩個 Register 動態編譯 WebPart 控件的原始程式碼。靜態連接會在頁面上的 <StaticConnections> 元素內宣告。請注意，在元素中<asp:webpartconnection>ProviderID，屬性具有指派給它的提供者控件標識碼。這是識別靜態連接提供者的必要專案。方法 Button1_Click 會存取屬性， Provider 並將其部分詳細數據寫入標籤。

<%@ 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];
    
    lbl1.Text = "<h3>Provider Details</h3><br />" +
      "ID: " + conn.Provider.ID + 
      "<br />" + 
      "Display Title: " + conn.Provider.Title + 
      "<br />" + 
      "Control type: " + conn.Provider.GetType().FullName;
  }

</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="Provider Details" 
        OnClick="Button1_Click" />
      <br />
      <asp:Label ID="lbl1" 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)
    
    lbl1.Text = "<h3>Provider Details</h3><br />" & _
      "ID: " & conn.Provider.ID & _
      "<br />" & _
      "Display Title: " & conn.Provider.Title & _
      "<br />" & _
      "Control type: " & conn.Provider.GetType().FullName
    
  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="Provider Details" 
        OnClick="Button1_Click" />
      <br />
      <asp:Label ID="lbl1" runat="server" />
    </div>
    </form>
</body>
</html>

在瀏覽器中載入頁面。已建立靜態連線。在提供者控件中輸入一些文字，並請注意，文字會顯示在取用者控件中。按兩下 [ 提供者詳細資料] 按鈕，以顯示透過 Provider 屬性存取的部分屬性值。

備註

每個網頁元件連接都包含兩 WebPart 個控件：取用者和提供者，而 Provider 屬性會傳回連接中提供者控件的參考。

如同取用者控件) (連接中的對應專案，必須有提供者控件才能建立連接。無論您是以程式設計方式建立連接，還是以頁面持續性格式宣告連接，都必須指定控件做為連線的提供者。

適用於

共用方式為

WebPartConnection.Provider 屬性

定義

屬性值

例外狀況

範例

備註

適用於

另請參閱

其他資源