AttributeTable クラス

2008-08-22

更新 : 2007 年 11 月

デザイン時の外観と動作を定義するメタデータ属性のテーブルです。

名前空間 : Microsoft.Windows.Design.Metadata
アセンブリ : Microsoft.Windows.Design (Microsoft.Windows.Design.dll 内)

構文

'宣言
Public NotInheritable Class AttributeTable
'使用
Dim instance As AttributeTable

public sealed class AttributeTable

public ref class AttributeTable sealed

public final class AttributeTable

解説

AttributeTable クラスを使用して、デザイン時メタデータ属性と Windows Presentation Foundation (WPF) 型とを関連付けます。

属性テーブルは、本質的には読み取り専用のディクショナリですが、キーと値は別々に計算されます。特定の型の属性が含まれているかどうかを属性テーブルに問い合わせると効率的です。実際の属性のセットは要求に応じて作成されます。

属性テーブルを作成するには、AttributeTableBuilder クラスの CreateTable メソッドを呼び出します。

例

属性テーブルを作成および設定する方法を次のコード例に示します。詳細については、「チュートリアル : デザイン時装飾の作成」を参照してください。

Imports System
Imports System.Collections
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Reflection
Imports System.Text
Imports System.Windows.Media
Imports System.Windows.Controls
Imports System.Windows

Imports Microsoft.Windows.Design
Imports Microsoft.Windows.Design.Features
Imports Microsoft.Windows.Design.Metadata

' Container for any general design-time metadata to initialize.
' Designers look for a type in the design-time assembly that 
' implements IRegisterMetadata. If found, designers instantiate 
' this class and call its Register() method automatically.

Friend Class Metadata
    Implements IRegisterMetadata

    ' Called by the designer to register any design-time metadata.
    Public Sub Register() Implements IRegisterMetadata.Register
        Dim builder As New AttributeTableBuilder()

        ' Apply the ReadOnlyAttribute to the Background property 
        ' of the Button class.
        builder.AddCustomAttributes(GetType(Button), "Background", New ReadOnlyAttribute(True))

        Dim attributes As AttributeTable = builder.CreateTable()

        MetadataStore.AddAttributeTable(attributes)

        Dim hasCustomAttributes As Boolean = attributes.ContainsAttributes(GetType(Button))

        Dim types As IEnumerable(Of Type) = attributes.AttributedTypes

        ' The following code shows how to retrieve custom attributes
        ' using the GetCustomAttributes method overloads.

        Dim attrs0 As IEnumerable = attributes.GetCustomAttributes(GetType(Button))

        Dim attrs1 As IEnumerable = attributes.GetCustomAttributes(GetType(Button), "Background")

        Dim properties As PropertyDescriptorCollection = TypeDescriptor.GetProperties(GetType(Button))
        Dim pd As PropertyDescriptor = properties("Background")
        Dim attrs2 As IEnumerable = attributes.GetCustomAttributes(GetType(Button), pd)

        Dim attrs3 As IEnumerable = attributes.GetCustomAttributes(GetType(Button), Button.BackgroundProperty)

        Dim members As MemberInfo() = GetType(Button).GetMembers()
        Dim i As Integer
        For i = 0 To members.Length
            If members(i).Name = "Background" Then
                Dim attrs4 As IEnumerable = attributes.GetCustomAttributes(GetType(Button), members(i))
            End If
        Next i

    End Sub

End Class

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using System.Text;
using System.Windows.Media;
using System.Windows.Controls;
using System.Windows;

using Microsoft.Windows.Design.Features;
using Microsoft.Windows.Design.Metadata;

namespace CustomControlLibrary.VisualStudio.Design
{
    // Container for any general design-time metadata to initialize.
    // Designers look for a type in the design-time assembly that 
    // implements IRegisterMetadata. If found, designers instantiate 
    // this class and call its Register() method automatically.
    internal class Metadata : IRegisterMetadata
    {
        // Called by the designer to register any design-time metadata.
        public void Register()
        {
            AttributeTableBuilder builder = new AttributeTableBuilder();

            // Apply the ReadOnlyAttribute to the Background property 
            // of the Button class.
            builder.AddCustomAttributes(
                typeof(Button),
                "Background",
                new ReadOnlyAttribute(true)  );

            AttributeTable attributes = builder.CreateTable();

            MetadataStore.AddAttributeTable(attributes);

            bool hasCustomAttributes = attributes.ContainsAttributes(typeof(Button));

            IEnumerable<Type> types = attributes.AttributedTypes;

            // The following code shows how to retrieve custom attributes
            // using the GetCustomAttributes method overloads.

            IEnumerable attrs0 = attributes.GetCustomAttributes(typeof(Button));

            IEnumerable attrs1 = attributes.GetCustomAttributes(
                typeof(Button), 
                "Background");

            PropertyDescriptorCollection properties = 
                TypeDescriptor.GetProperties(typeof(Button));
            PropertyDescriptor pd = properties["Background"];
            IEnumerable attrs2 = attributes.GetCustomAttributes(typeof(Button), pd);

            IEnumerable attrs3 = attributes.GetCustomAttributes(
                typeof(Button),
                Button.BackgroundProperty);

            MemberInfo[] members = typeof(Button).GetMembers();
            for (int i = 0; i < members.Length; i++)
            {
                if (members[i].Name == "Background")
                {
                    IEnumerable attrs4 = attributes.GetCustomAttributes(
                        typeof(Button), 
                        members[i]);
                }
            }
        }
    }
}