IWebPartRow.GetRowData メソッド
アセンブリ: System.Web (system.web.dll 内)



GetRowData メソッドを実装して使用するコード例を次に示します。完全なコード例については、IWebPartRow 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 コントロールが GetRowData メソッドを実装し、データ テーブル内の特定の行の値を返します。コンシューマ コントロールが、OnPreRender メソッドで GetRowData メソッドを呼び出します。これによりデータの値をページに書き込むことができます。
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 row data. <AspNetHostingPermission(SecurityAction.Demand, _ Level:=AspNetHostingPermissionLevel.Minimal)> _ <AspNetHostingPermission(SecurityAction.InheritanceDemand, _ Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class RowProviderWebPart Inherits WebPart Implements IWebPartRow 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 'New <ConnectionProvider("Row")> _ Public Function GetConnectionInterface() As IWebPartRow Return New RowProviderWebPart() End Function 'GetConnectionInterface Public ReadOnly Property Schema() As _ ComponentModel.PropertyDescriptorCollection Implements IWebPartRow.Schema Get Return TypeDescriptor.GetProperties(_table.DefaultView(0)) End Get End Property Public Sub GetRowData(ByVal callback As RowCallback) _ Implements IWebPartRow.GetRowData callback(_table.Rows) End Sub End Class 'RowProviderWebPart ' This sample code creates a Web Parts control that acts as a consumer ' of row data. <AspNetHostingPermission(SecurityAction.Demand, _ Level:=AspNetHostingPermissionLevel.Minimal)> _ <AspNetHostingPermission(SecurityAction.InheritanceDemand, _ Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class RowConsumerWebPart Inherits WebPart Private _provider As IWebPartRow Private _tableData As ICollection Private Sub GetRowData(ByVal rowData As Object) _tableData = CType(rowData, ICollection) End Sub Protected Overrides Sub OnPreRender(ByVal e As EventArgs) If Not (_provider Is Nothing) Then _provider.GetRowData(New RowCallback(AddressOf GetRowData)) 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)) writer.WriteBreak() writer.WriteLine() count = count + 1 Next o Next prop Else writer.Write("No data") End If Else writer.Write("Not connected") End If End Sub <ConnectionConsumer("Row")> _ Public Sub SetConnectionInterface(ByVal provider As IWebPartRow) _provider = provider End Sub End Class 'RowConsumerWebPart End Namespace ' Samples.AspNet.VB.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 row data. [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class RowProviderWebPart : WebPart, IWebPartRow { private DataTable _table; public RowProviderWebPart() { _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); } [ConnectionProvider("Row")] public IWebPartRow GetConnectionInterface() { return new RowProviderWebPart(); } public PropertyDescriptorCollection Schema { get { return TypeDescriptor.GetProperties(_table.DefaultView[0]); } } public void GetRowData(RowCallback callback) { callback(_table.Rows); } } // RowProviderWebPart // This sample code creates a Web Parts control that acts as a consumer // of row data. [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class RowConsumerWebPart : WebPart { private IWebPartRow _provider; private ICollection _tableData; private void GetRowData(object rowData) { _tableData = (ICollection)rowData; } protected override void OnPreRender(EventArgs e) { if (_provider != null) { _provider.GetRowData(new RowCallback(GetRowData)); } } 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("Row")] public void SetConnectionInterface(IWebPartRow provider) { _provider = provider; } } // RowConsumerWebPart } // Samples.AspNet.CS.Controls

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