IWebPartRow.Schema 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 informasi skema untuk baris data yang digunakan untuk berbagi data di antara dua WebPart kontrol.
public:
property System::ComponentModel::PropertyDescriptorCollection ^ Schema { System::ComponentModel::PropertyDescriptorCollection ^ get(); };public System.ComponentModel.PropertyDescriptorCollection Schema { get; }member this.Schema : System.ComponentModel.PropertyDescriptorCollectionPublic ReadOnly Property Schema As PropertyDescriptorCollectionNilai Properti
Yang PropertyDescriptorCollection menjelaskan data.
Contoh
Contoh kode berikut menunjukkan implementasi dan penggunaan Schema properti. Contoh lengkap ditampilkan dalam gambaran umum kelas untuk IWebPartRow antarmuka. Kontrol penyedia mengimplementasikan Schema properti . Kemudian kontrol konsumen, dalam metodenya RenderContents , meminta Schema properti untuk mengambil informasi tentang baris saat menulis data baris ke halaman.
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
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
<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
' 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
End Namespace ' Samples.AspNet.VB.Controls
Keterangan
Properti ini menyediakan informasi properti untuk data.
IWebPartRow Dengan menggunakan antarmuka dalam koneksi, Anda mendapatkan PropertyDescriptorCollection objek, yang dirujuk oleh Schema properti . Kontrak menentukan bahwa panggilan Schema[n].GetValue(RowData) mengembalikan nilai kolom nth dalam baris. Anda perlu menggunakan Schema properti untuk mendapatkan nilai dalam baris.
