IWebPartRow.Schema 속성
정의
중요
일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.
두 WebPart 컨트롤 간에 데이터를 공유하는 데 사용되는 데이터 행에 대한 스키마 정보를 가져옵니다.
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 PropertyDescriptorCollection속성 값
데이터를 설명하는 PropertyDescriptorCollection입니다.
예제
다음 코드 예제에서는 구현 하 고 속성의 사용을 보여 있습니다 Schema . 전체 예제는 인터페이스에 대한 클래스 개요에 나와 있습니다 IWebPartRow . 공급자 컨트롤은 속성을 구현합니다 Schema . 그런 다음 소비자 컨트롤은 해당 RenderContents 메서드에서 행 데이터를 페이지에 쓸 때 행에 대한 정보를 검색하도록 속성을 쿼리 Schema 합니다.
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
설명
이 속성은 데이터에 대한 속성 정보를 제공합니다. 연결에서 IWebPartRow 인터페이스를 사용하면 속성에서 참조하는 개체를 Schema 가져옵니다PropertyDescriptorCollection. 계약은 호출 Schema[n].GetValue(RowData) 이 행의 n 번째 열 값을 반환하는 것을 지정합니다. 이 속성을 사용하여 Schema 행의 값을 가져와야 합니다.