IWebPartTable.Schema プロパティとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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IWebPartTable.Schema プロパティ

メモ : このプロパティは、.NET Framework version 2.0 で新しく追加されたものです。

2 つの WebPart コントロール間でデータを共有するために使用されるデータテーブルのスキーマ情報を取得します。

名前空間: System.Web.UI.WebControls.WebParts
アセンブリ: System.Web (system.web.dll 内)
構文

Visual Basic (宣言)

ReadOnly Property Schema As
 PropertyDescriptorCollection

Visual Basic (使用法)

Dim instance As IWebPartTable
Dim value As PropertyDescriptorCollection

value = instance.Schema

PropertyDescriptorCollection Schema { get; }

C++

property PropertyDescriptorCollection^ Schema {
    PropertyDescriptorCollection^ get ();
}

/** @property */
PropertyDescriptorCollection get_Schema ()

JScript

function get Schema () : PropertyDescriptorCollection

プロパティ値
データを記述する PropertyDescriptorCollection。

解説

このプロパティは、IWebPartTable インスタンス内のデータのプロパティ情報を提供します。Schema プロパティによって参照されるスキーマとテーブル内のデータの間には、暗黙のコントラクトがあります。このコントラクトは Schema プロパティ内の PropertyDescriptor オブジェクト用のコントラクトであり、テーブルデータの要素で GetValue を呼び出すことにより、テーブルの列または行内の値を取得できます。

使用例

Schema プロパティを実装して使用するコード例を次に示します。完全なサンプルについては、IWebPartTable インターフェイスのクラスの概要を参照してください。プロバイダコントロールは Schema プロパティを実装します。コンシューマコントロールは、その RenderContents メソッド内で、ページにテーブルデータを書き込むときに Schema プロパティを照会して、テーブルに関する情報を取得します。

Visual Basic

Imports System
Imports System.Collections
Imports System.ComponentModel
Imports System.Data
Imports System.Reflection
Imports System.Security.Permissions
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts

Namespace Samples.AspNet.VB.Controls

  ' This sample code creates a Web Parts control that acts as a provider
 
  ' of table data.
  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public NotInheritable Class
 TableProviderWebPart
    Inherits WebPart
    Implements IWebPartTable
    Private _table As DataTable


    Public Sub New()
      _table = New DataTable()

      Dim col As New DataColumn()
      col.DataType = GetType(String)
      col.ColumnName = "Name"
      _table.Columns.Add(col)

      col = New DataColumn()
      col.DataType = GetType(String)
      col.ColumnName = "Address"
      _table.Columns.Add(col)

      col = New DataColumn()
      col.DataType = GetType(Integer)
      col.ColumnName = "ZIP Code"
      _table.Columns.Add(col)

      Dim row As DataRow = _table.NewRow()
      row("Name") = "John Q. Public"
      row("Address") = "123 Main
 Street"
      row("ZIP Code") = 98000
      _table.Rows.Add(row)

    End Sub


    Public ReadOnly Property
 Schema() As _
      ComponentModel.PropertyDescriptorCollection Implements IWebPartTable.Schema

      Get
        Return TypeDescriptor.GetProperties(_table.DefaultView(0))
      End Get

    End Property


    Public Sub GetTableData(ByVal
 callback As TableCallback) _
      Implements IWebPartTable.GetTableData

      callback(_table.Rows)

    End Sub


    Public Property ConnectionPointEnabled()
 As Boolean
      Get
        Dim o As Object
 = ViewState("ConnectionPointEnabled")
        Return IIf(Not (o Is
 Nothing), CBool(o), True)
      End Get
      Set(ByVal value As
 Boolean)
        ViewState("ConnectionPointEnabled") = value
      End Set
    End Property


    <ConnectionProvider("Table", GetType(TableProviderConnectionPoint),
 _
      AllowsMultipleConnections:=True)> _
    Public Function GetConnectionInterface()
 As IWebPartTable

      Return New TableProviderWebPart()

    End Function

  End Class 'TableProviderWebPart

  ' The connection point for the provider control.
  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class TableProviderConnectionPoint
    Inherits ProviderConnectionPoint

    Public Sub New(ByVal
 callbackMethod As MethodInfo, _
      ByVal interfaceType As Type, ByVal
 controlType As Type, _
      ByVal name As String,
 ByVal id As String, _
      ByVal allowsMultipleConnections As Boolean)
      MyBase.New(callbackMethod, interfaceType, controlType, _
        name, id, allowsMultipleConnections)

    End Sub


    Public Overrides Function
 GetEnabled(ByVal control _
      As Control) As Boolean

      Return CType(control, TableProviderWebPart).ConnectionPointEnabled

    End Function
  End Class


  ' This code sample creates a Web Parts control that acts as a consumer
 
  ' of information provided by the TableProvider.ascx control.
  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class TableConsumer
    Inherits WebPart
    Private _provider As IWebPartTable
    Private _tableData As ICollection


    Private Sub GetTableData(ByVal
 tableData As ICollection)
      _tableData = CType(tableData, ICollection)

    End Sub


    Protected Overrides Sub
 OnPreRender(ByVal e As EventArgs)
      If Not (_provider Is
 Nothing) Then
        _provider.GetTableData(New TableCallback(AddressOf
 GetTableData))
      End If

    End Sub


    Protected Overrides Sub
 RenderContents(ByVal writer As HtmlTextWriter)
      If Not (_provider Is
 Nothing) Then
        Dim props As PropertyDescriptorCollection
 = _provider.Schema
        Dim count As Integer
 = 0
        If Not (props Is
 Nothing) AndAlso props.Count > 0 _
          AndAlso Not (_tableData Is
 Nothing) Then

          Dim prop As PropertyDescriptor
          For Each prop In
 props
            Dim o As DataRow
            For Each o In
 _tableData
              writer.Write(prop.DisplayName & ": "
 & o(count))
            Next o
            writer.WriteBreak()
            writer.WriteLine()
            count = count + 1
          Next prop
        Else
          writer.Write("No data")
        End If
      Else
        writer.Write("Not connected")
      End If

    End Sub


    <ConnectionConsumer("Table")> _
    Public Sub SetConnectionInterface(ByVal
 provider As IWebPartTable)
      _provider = provider

    End Sub

  End Class 'TableConsumer

  ' The connection point for the consumer control.
  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class TableConsumerConnectionPoint
    Inherits ConsumerConnectionPoint

    Public Sub New(ByVal
 callbackMethod As MethodInfo, _
      ByVal interfaceType As Type, ByVal
 controlType As Type, _
      ByVal name As String,
 ByVal id As String, _
      ByVal allowsMultipleConnections As Boolean)
      MyBase.New(callbackMethod, interfaceType, controlType, name,
 _
        id, allowsMultipleConnections)

    End Sub
  End Class 'TableConsumerConnectionPoint

End Namespace  ' Samples.AspNet.CS.Controls

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Reflection;
using System.Security.Permissions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

namespace Samples.AspNet.CS.Controls
{
  // This sample code creates a Web Parts control that acts as a provider
 
  // of table data.
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class TableProviderWebPart
 : WebPart, IWebPartTable
    {
        DataTable _table;

        public TableProviderWebPart()
        {
            _table = new DataTable();

            DataColumn col = new DataColumn();
            col.DataType = typeof(string);
            col.ColumnName = "Name";
            _table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = typeof(string);
            col.ColumnName = "Address";
            _table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = typeof(int);
            col.ColumnName = "ZIP Code";
            _table.Columns.Add(col);

            DataRow row = _table.NewRow();
            row["Name"] = "John Q. Public";
            row["Address"] = "123 Main Street";
            row["ZIP Code"] = 98000;
            _table.Rows.Add(row);
        }

        public PropertyDescriptorCollection Schema
        {
            get
            {
                return TypeDescriptor.GetProperties(_table.DefaultView[0]);
            }
        }

        public void GetTableData(TableCallback
 callback)
        {
                callback(_table.Rows);
        }

        public bool ConnectionPointEnabled
        {
            get
            {
                object o = ViewState["ConnectionPointEnabled"];
                return (o != null) ? (bool)o
 : true;
            }
            set
            {
                ViewState["ConnectionPointEnabled"] = value;
            }
        }

        [ConnectionProvider("Table", typeof(TableProviderConnectionPoint),
 
      AllowsMultipleConnections = true)]
        public IWebPartTable GetConnectionInterface()
        {
            return new TableProviderWebPart();
        }

        public class TableProviderConnectionPoint
 : ProviderConnectionPoint
        {
            public TableProviderConnectionPoint(MethodInfo callbackMethod,
 
        Type interfaceType, Type controlType, string name, string
 id, 
        bool allowsMultipleConnections) 
        : base(callbackMethod, interfaceType, controlType, name,
 id, 
          allowsMultipleConnections)
            {
            }

            public override bool GetEnabled(Control
 control)
            {
                return ((TableProviderWebPart)control).ConnectionPointEnabled;
            }

        }

    }


  // This code sample creates a Web Parts control that acts as a consumer
 
  // of information provided by the TableProvider.ascx control.
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public class TableConsumer : WebPart
  {
    private IWebPartTable _provider;
    private ICollection _tableData;

    private void GetTableData(object tableData)
    {
      _tableData = (ICollection)tableData;
    }

    protected override void OnPreRender(EventArgs
 e)
    {
      if (_provider != null)
      {
        _provider.GetTableData(new TableCallback(GetTableData));
      }
    }

    protected override void RenderContents(HtmlTextWriter
 writer)
    {
      if (_provider != null)
      {
        PropertyDescriptorCollection props = _provider.Schema;
        int count = 0;
        if (props != null && props.Count
 > 0 && _tableData != null)
        {
          foreach (PropertyDescriptor prop in
 props)
          {
            foreach (DataRow o in _tableData)
            {
              writer.Write(prop.DisplayName + ": " + o[count]);
            }
            writer.WriteBreak();
            writer.WriteLine();
            count = count + 1;
          }
        }
        else
        {
          writer.Write("No data");
        }
      }
      else
      {
        writer.Write("Not connected");
      }
    }

    [ConnectionConsumer("Table")]
    public void SetConnectionInterface(IWebPartTable
 provider)
    {
      _provider = provider;
    }

    public class TableConsumerConnectionPoint
 : ConsumerConnectionPoint
    {
      public TableConsumerConnectionPoint(MethodInfo callbackMethod
,
        Type interfaceType, Type controlType, string name, string
 id,
        bool allowsMultipleConnections)
        : base(callbackMethod, interfaceType, controlType, name,
 id,
        allowsMultipleConnections)
      {
      }

    } // TableConsumerConnectionPoint

  } // TableConsumer

} // Samples.AspNet.CS.Controls

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
IWebPartTable インターフェイス
IWebPartTable メンバ
System.Web.UI.WebControls.WebParts 名前空間
PropertyDescriptorCollection

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IWebPartTable.Schema プロパティとは？わかりやすく解説