DataSourceDesigner クラスとは? わかりやすく解説

DataSourceDesigner クラス

メモ : このクラスは、.NET Framework version 2.0新しく追加されたものです。

DataSourceControl クラスを、デザイン ホストデザイン時に使用できるようにします。

名前空間: System.Web.UI.Design
アセンブリ: System.Design (system.design.dll 内)
構文構文

Public Class DataSourceDesigner
    Inherits ControlDesigner
    Implements IDataSourceDesigner
Dim instance As DataSourceDesigner
public class DataSourceDesigner : ControlDesigner,
 IDataSourceDesigner
public ref class DataSourceDesigner : public
 ControlDesigner, IDataSourceDesigner
public class DataSourceDesigner extends ControlDesigner
 implements IDataSourceDesigner
public class DataSourceDesigner extends
 ControlDesigner implements IDataSourceDesigner
解説解説

DataSourceDesigner クラスは、SqlDataSourceDesigner、AccessDataSourceDesigner、および ObjectDataSourceDesigner の各クラス始めとするデータ ソース デザイナ基本クラスです。新し種類データ ソース コントロール作成するときに、そのコントロールカスタム コントロール デザイナ作成必要になることがありますその場合は、DataSourceDesigner クラスからデザイナ派生させます

DataSourceDesigner クラスには、OnDataSourceChanged および OnSchemaRefreshed という 2 つイベント メソッドあります。この 2 つメソッドは、SuppressDataSourceEvents メソッド使用して SuppressingDataSourceEvents プロパティ設定することにより、一時的に無効にできます。これらのイベント メソッドは、後で ResumeDataSourceEvents メソッド使用して再び有効にできます

次の 2 つ静的メソッド使用すると、クラスインスタンス作成せずにスキーマまたはビュー等しかどうか評価できます

継承時の注意 デザイン時に派生クラスアクション リスト メニューコマンド提供するには、ActionLists プロパティオーバーライドして、DesignerActionList オブジェクトから派生するカスタム項目が設定されDesignerActionListCollection オブジェクト返す必要があります

使用例使用例

次の表に示すいくつかの小さカスタム クラス設定されカスタム データ ソース コントロール使用する方法次のコード例示します

カスタム クラス

派生

CustomDataSource

ObjectDataSource

CustomDataSourceDesigner

DataSourceDesigner

CustomDataSourceView

ObjectDataSourceView

CustomDesignDataSourceView

DesignerDataSourceView

BookListViewSchema

IDataSourceViewSchema

CustomIDFieldSchema

IDataSourceFieldSchema

CustomTitleFieldSchema

IDataSourceFieldSchema

BookItem (2 つフィールドを持つデータ構造体)

このコード例コンパイルした後でデザイン ビュー.aspx page開きDataSourceID プロパティカスタム データ ソース コントロールID設定します

Imports Microsoft.VisualBasic
Imports System
Imports System.Data
Imports System.Security.Permissions
Imports System.Collections
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.Design
Imports System.Web.UI.Design.WebControls
Imports System.ComponentModel
Imports System.ComponentModel.Design

Namespace ASPNet.Design.Samples_VB
    <Designer(GetType(CustomDataSourceDesigner)), _
        ToolboxData("<{0}:CustomDataSource runat=""server""></{0}:CustomDataSource>")>
 _
    Public Class CustomDataSource
        Inherits ObjectDataSource

        Dim _defaultViewName As String
 = "BookList"
        Dim _view As ObjectDataSourceView =
 Nothing

        Public Sub New()
            MyBase.New()
        End Sub

        ' Gets a view by name
        Protected Overrides Function
 GetView(ByVal viewName As String)
 As DataSourceView
            ' This data source only allows one view
            If Not (viewName.Equals(_defaultViewName))
 Then
                Return Nothing
            ElseIf IsNothing(_view) Then
                _view = New CustomDataSourceView(Me,
 _
                    _defaultViewName, HttpContext.Current)
            End If

            Return _view
        End Function

        ' Gets a list of view names for this class
        Protected Overrides Function
 GetViewNames() As ICollection
            Dim ar As New
 ArrayList()
            ar.Add(_defaultViewName)
            Return CType(ar, ICollection)
        End Function

    End Class

    ' The runtime data source view
    Public Class CustomDataSourceView
        Inherits ObjectDataSourceView

        Dim _data As ArrayList = Nothing

        Public Sub New(ByVal
 owner As CustomDataSource, ByVal viewName
 As String, ByVal context As HttpContext)
            MyBase.New(owner, viewName, context)
            owner.SelectCountMethod = "GetCount"
        End Sub

        ' This method would typically get a set of live data
        ' rather than create some dummy data
        Protected Overrides Function
 ExecuteSelect(ByVal arguments As DataSourceSelectArguments)
 As System.Collections.IEnumerable
            If (IsNothing(_data)) Then
                _data = New ArrayList()
                _data.Add(New BookItem("ID_1",
 "Runtime Title 01"))
                _data.Add(New BookItem("ID_2",
 "Runtime Title 02"))
                _data.Add(New BookItem("ID_3",
 "Runtime Title 03"))
            End If
            Return CType(_data, IEnumerable)
        End Function

        ' Allow getting the record count
        Public Overrides ReadOnly
 Property CanRetrieveTotalRowCount() As Boolean
            Get
                Return True
            End Get
        End Property

        ' Returns the number of records in the current set of data
        Public ReadOnly Property
 GetCount() As Integer
            Get
                If IsNothing(_data) Then
                    Return 0
                Else
                    Return _data.Count
                End If
            End Get
        End Property
        ' Do not allow deletions
        Public Overrides ReadOnly
 Property CanDelete() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow insertions
        Public Overrides ReadOnly
 Property CanInsert() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow paging
        Public Overrides ReadOnly
 Property CanPage() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow sorting
        Public Overrides ReadOnly
 Property CanSort() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow updating
        Public Overrides ReadOnly
 Property CanUpdate() As Boolean
            Get
                Return False
            End Get
        End Property

    End Class

    ' A class to define a record of the data
    Public Class BookItem
        Private _id As String
        Private _title As String

        Public Sub New(ByVal
 id As String, ByVal title
 As String)
            _id = id
            _title = title
        End Sub

        Public ReadOnly Property
 ID() As String
            Get
                Return _id
            End Get
        End Property

        Public Property Title() As
 String
            Get
                Return _title
            End Get
            Set(ByVal value As
 String)
                _title = value
            End Set
        End Property
    End Class

    ' Custom designer for the CustomDataSource control.
    Public Class CustomDataSourceDesigner
        Inherits DataSourceDesigner

        Private _control As CustomDataSource
 = Nothing
        Private _defaultViewName As String
 = "BookList"
        Private _view As CustomDesignDataSourceView
 = Nothing

        Public Overrides Sub
 Initialize(ByVal cmponent As IComponent)
            MyBase.Initialize(cmponent)
            _control = CType(cmponent, CustomDataSource)
        End Sub

        ' Get a view
        Public Overrides Function
 GetView(ByVal viewName As String)
 As DesignerDataSourceView
            If Not (viewName.Equals(_defaultViewName))
 Then
                Return Nothing
            ElseIf IsNothing(_view) Then
                _view = New CustomDesignDataSourceView(Me,
 _
                    _defaultViewName)
            End If

            Return _view
        End Function

        ' Get a list of view names
        Public Overrides Function
 GetViewNames() As String()
            Return New String()
 {"BookList"}
        End Function

        ' Don't allow refreshing the schema
        Public Overrides ReadOnly
 Property CanRefreshSchema() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow resizing
        Public Overrides ReadOnly
 Property AllowResize() As Boolean
            Get
                Return False
            End Get
        End Property
    End Class

    ' A     design-time data source view
    Public Class CustomDesignDataSourceView
        Inherits DesignerDataSourceView

        Private _data As ArrayList = Nothing

        Public Sub New(ByVal
 owner As CustomDataSourceDesigner, ByVal
 viewName As String)
            MyBase.New(owner, viewName)
        End Sub

        ' Get data for design-time display
        Public Overrides Function
 GetDesignTimeData( _
            ByVal minimumRows As Integer,
 _
            ByRef isSampleData As Boolean)
 As IEnumerable

            If IsNothing(_data) Then
                ' Create a set of design-time fake data
                _data = New ArrayList()
                Dim i As Integer
                For i = 1 To minimumRows
                    _data.Add(New BookItem("ID_"
 & i.ToString(), _
                        "Design-Time Title 0" &
 i.ToString()))
                Next
            End If
            isSampleData = True
            Return CType(_data, IEnumerable)
        End Function

        Public Overrides ReadOnly
 Property Schema() As IDataSourceViewSchema
            Get
                Return New BookListViewSchema()
            End Get
        End Property

        ' Allow getting the record count
        Public Overrides ReadOnly
 Property CanRetrieveTotalRowCount() As Boolean
            Get
                Return True
            End Get
        End Property
        ' Do not allow deletions
        Public Overrides ReadOnly
 Property CanDelete() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow insertions
        Public Overrides ReadOnly
 Property CanInsert() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow updates
        Public Overrides ReadOnly
 Property CanUpdate() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow paging
        Public Overrides ReadOnly
 Property CanPage() As Boolean
            Get
                Return False
            End Get
        End Property
        ' Do not allow sorting
        Public Overrides ReadOnly
 Property CanSort() As Boolean
            Get
                Return False
            End Get
        End Property
    End Class

    ' A custom View Schema class
    Public Class BookListViewSchema
        Implements IDataSourceViewSchema

        Public Sub New()
        End Sub

        ' The name of this View Schema
        Public ReadOnly Property
 Name() As String Implements
 IDataSourceViewSchema.Name
            Get
                Return "BookList"
            End Get
        End Property

        ' Build a Field Schema array
        Public Function GetFields() As
 IDataSourceFieldSchema() Implements IDataSourceViewSchema.GetFields
            Dim fields(1) As IDataSourceFieldSchema
            fields(0) = New CustomIDFieldSchema()
            fields(1) = New CustomTitleFieldSchema()
            Return fields
        End Function
        ' There are no child views, so return Nothing
        Public Function GetChildren() As
 IDataSourceViewSchema() Implements IDataSourceViewSchema.GetChildren
            Return Nothing
        End Function
    End Class

    ' A custom Field Schema class for ID
    Public Class CustomIDFieldSchema
        Implements IDataSourceFieldSchema

        Public Sub New()
        End Sub

        ' Name is ID
        Public ReadOnly Property
 Name() As String Implements
 IDataSourceFieldSchema.Name
            Get
                Return "ID"
            End Get
        End Property
        ' Data type is string
        Public ReadOnly Property
 DataType() As Type Implements IDataSourceFieldSchema.DataType
            Get
                Return GetType(String)
            End Get
        End Property
        ' This is not an Identity field
        Public ReadOnly Property
 Identity() As Boolean Implements
 IDataSourceFieldSchema.Identity
            Get
                Return False
            End Get
        End Property
        ' This field is read only
        Public ReadOnly Property
 IsReadOnly() As Boolean Implements
 IDataSourceFieldSchema.IsReadOnly
            Get
                Return True
            End Get
        End Property
        ' This field is unique
        Public ReadOnly Property
 IsUnique() As Boolean Implements
 IDataSourceFieldSchema.IsUnique
            Get
                Return True
            End Get
        End Property
        ' This field can't be longer than 20
        Public ReadOnly Property
 Length() As Integer Implements
 IDataSourceFieldSchema.Length
            Get
                Return 20
            End Get
        End Property
        ' This field can't be null
        Public ReadOnly Property
 Nullable() As Boolean Implements
 IDataSourceFieldSchema.Nullable
            Get
                Return False
            End Get
        End Property
        ' This is a Primary Key
        Public ReadOnly Property
 PrimaryKey() As Boolean Implements
 IDataSourceFieldSchema.PrimaryKey
            Get
                Return True
            End Get
        End Property

        ' These properties do not apply
        Public ReadOnly Property
 Precision() As Integer Implements
 IDataSourceFieldSchema.Precision
            Get
                Return -1
            End Get
        End Property
        Public ReadOnly Property
 Scale() As Integer Implements
 IDataSourceFieldSchema.Scale
            Get
                Return -1
            End Get
        End Property
    End Class

    ' A custom Field Schema class for Title
    Public Class CustomTitleFieldSchema
        Implements IDataSourceFieldSchema

        Public Sub New()
        End Sub

        ' Name is Title
        Public ReadOnly Property
 Name() As String Implements
 IDataSourceFieldSchema.Name
            Get
                Return "Title"
            End Get
        End Property
        ' Type is string
        Public ReadOnly Property
 DataType() As Type Implements IDataSourceFieldSchema.DataType
            Get
                Return GetType(String)
            End Get
        End Property
        ' This is not an Identity field
        Public ReadOnly Property
 Identity() As Boolean Implements
 IDataSourceFieldSchema.Identity
            Get
                Return False
            End Get
        End Property
        ' This field is not read only
        Public ReadOnly Property
 IsReadOnly() As Boolean Implements
 IDataSourceFieldSchema.IsReadOnly
            Get
                Return False
            End Get
        End Property
        ' This field is not unique
        Public ReadOnly Property
 IsUnique() As Boolean Implements
 IDataSourceFieldSchema.IsUnique
            Get
                Return False
            End Get
        End Property
        ' This field can't be longer than 100
        Public ReadOnly Property
 Length() As Integer Implements
 IDataSourceFieldSchema.Length
            Get
                Return 100
            End Get
        End Property
        ' This field can't be null
        Public ReadOnly Property
 Nullable() As Boolean Implements
 IDataSourceFieldSchema.Nullable
            Get
                Return False
            End Get
        End Property
        ' This is not the Primary Key
        Public ReadOnly Property
 PrimaryKey() As Boolean Implements
 IDataSourceFieldSchema.PrimaryKey
            Get
                Return False
            End Get
        End Property

        ' These properties do not apply
        Public ReadOnly Property
 Precision() As Integer Implements
 IDataSourceFieldSchema.Precision
            Get
                Return -1
            End Get
        End Property
        Public ReadOnly Property
 Scale() As Integer Implements
 IDataSourceFieldSchema.Scale
            Get
                Return -1
            End Get
        End Property
    End Class

End Namespace
<br /><span space="preserve">...</span><br
 /><%@ Page Language="VB" %>
<%@ Register TagPrefix="aspSample" 
    Namespace="ASPNet.Design.Samples_VB"
 %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html  >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <aspSample:CustomDataSource runat=server 
        ID="CustomDS1"></aspSample:CustomDataSource>
    <asp:GridView ID="GridView1" runat="server"></asp:GridView>
    
    </div>
    </form>
</body>
</html>
using System;
using System.Data;
using System.Security.Permissions;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;

namespace ASPNet.Design.Samples_CS
{
    [Designer(typeof(CustomDataSourceDesigner)),
        ToolboxData("<{0}:CustomDataSource runat=\"server\"></{0}:CustomDataSource>")]
    public class CustomDataSource : ObjectDataSource
    {
        private ObjectDataSourceView _view = null;
        private string _defaultViewName = "BookList";

        public CustomDataSource() : base()
 { }

        // Gets a view by name
        protected override DataSourceView GetView(string
 viewName)
        {
            // This data source only allows one view
            if (viewName != _defaultViewName)
                return null;
            else if (_view == null)
            {
                _view = new CustomDataSourceView(this,
 
                    _defaultViewName, HttpContext.Current);
            }

            return _view;
        }

        // Gets a list of view names for this class
        protected override ICollection GetViewNames()
        {
            ArrayList ar = new ArrayList(1);
            ar.Add(_defaultViewName);
            return ar as ICollection;
        }

    }

    // The runtime data source view
    public class CustomDataSourceView : ObjectDataSourceView
    {
        private ArrayList _data = null;

        public CustomDataSourceView(CustomDataSource owner, 
            string viewName, HttpContext context)
            : base(owner, viewName, context)
        {
            owner.SelectCountMethod = "GetCount";
        }

        // This method would typically get a set of live data  
        // rather than create some dummy data
        protected override IEnumerable ExecuteSelect(
            DataSourceSelectArguments arguments)
        {
            if (_data == null)
            {
                // Create a set of runtime fake data
                _data = new ArrayList();
                _data.Add(new BookItem("ID_1", "Runtime
 Title 01"));
                _data.Add(new BookItem("ID_2", "Runtime
 Title 02"));
                _data.Add(new BookItem("ID_3", "Runtime
 Title 03"));
            }

            return _data as IEnumerable;
        }

        // Allow getting the record count
        public override bool CanRetrieveTotalRowCount
        {
            get { return true;
 }
        }

        // Returns the number of records in the current set of data
        public int GetCount()
        {
            if (_data == null)
                return 0;
            else
                return _data.Count;
        }
        
        // Do not allow deletions
        public override bool CanDelete
        {
            get { return false;
 }
        }
        // Do not allow insertions
        public override bool CanInsert
        {
            get { return false;
 }
        }
        // Do not allow paging
        public override bool CanPage
        {
            get { return false;
 }
        }
        // Do not allow sorting
        public override bool CanSort
        {
            get { return false;
 }
        }
        // Do not allow updating
        public override bool CanUpdate
        {
            get { return false;
 }
        }

    }

    // A class to define each record of the data
    public class BookItem
    {
        private string _id;
        private string _title;

        public BookItem(string id, string
 title)
        {
            _id = id;
            _title = title;
        }

        public string ID
        {
            get { return _id; }
        }
        public string Title
        {
            get { return _title; }
            set { _title = value; }
        }
    }

    // Custom designer for the CustomDataSource control.
    public class CustomDataSourceDesigner :
 DataSourceDesigner
    {
        private CustomDataSource _control;
        private string _defaultViewName = "BookList";
        private CustomDesignDataSourceView _view = null;

        // Initialize the designer
        public override void Initialize(IComponent
 component)
        {
            base.Initialize(component);
            _control = (CustomDataSource)Component;
        }

        // Get a view
        public override DesignerDataSourceView GetView(string
 viewName)
        {
            if (!viewName.Equals(_defaultViewName))
                return null;

            if (_view == null)
            {
                _view = new CustomDesignDataSourceView(this
,
                    _defaultViewName);
            }

            return _view;
        }

        // Get a list of view names
        public override string[] GetViewNames()
        {
            return new string[]
 { "BookList" };
        }

        // Do not allow refreshing the schema
        public override bool CanRefreshSchema
        {
            get { return false;
 }
        }
        // Do not allow resizing
        public override bool AllowResize
        {
            get { return false;
 }
        }
    }

    // A design-time data source view
    public class CustomDesignDataSourceView
 : DesignerDataSourceView
    {
        private ArrayList _data = null;

        public CustomDesignDataSourceView(
            CustomDataSourceDesigner owner, string viewName)
            : base(owner, viewName)
        {}

        // Get data for design-time display
        public override IEnumerable GetDesignTimeData(
            int minimumRows, out bool isSampleData)
        {
            if (_data == null)
            {
                // Create a set of design-time fake data
                _data = new ArrayList();
                for (int i = 1; i <= minimumRows;
 i++)
                {
                    _data.Add(new BookItem("ID_" + i.ToString()
,
                        "Design-Time Title 0" + i.ToString()));
                }
            }
            isSampleData = true;
            return _data as IEnumerable;
        }

        public override IDataSourceViewSchema Schema
        {
            get { return new
 BookListViewSchema(); }
        }

        // Allow getting the record count
        public override bool CanRetrieveTotalRowCount
        {
            get { return true;
 }
        }
        // Do not allow deletions
        public override bool CanDelete
        {
            get { return false;
 }
        }
        // Do not allow insertions
        public override bool CanInsert
        {
            get { return false;
 }
        }
        // Do not allow updates
        public override bool CanUpdate
        {
            get { return false;
 }
        }
        // Do not allow paging
        public override bool CanPage
        {
            get { return false;
 }
        }
        // Do not allow sorting
        public override bool CanSort
        {
            get { return false;
 }
        }
    }

    // A custom View Schema class
    public class BookListViewSchema : IDataSourceViewSchema
    {
        public BookListViewSchema()
        { }

        // The name of this View Schema
        public string Name
        {
            get { return "BookList";
 }
        }

        // Build a Field Schema array
        public IDataSourceFieldSchema[] GetFields()
        {
            IDataSourceFieldSchema[] fields = new IDataSourceFieldSchema[2];
            fields[0] = new CustomIDFieldSchema();
            fields[1] = new CustomTitleFieldSchema();
            return fields;
        }
        // There are no child views, so return null
        public IDataSourceViewSchema[] GetChildren()
        {
            return null;
        }
    }

    // A custom Field Schema class for ID
    public class CustomIDFieldSchema : IDataSourceFieldSchema
    {
        public CustomIDFieldSchema()
        { }

        // Name is ID
        public string Name
        {
            get { return "ID"; }
        }
        // Data type is string
        public Type DataType
        {
            get { return typeof(string);
 }
        }
        // This is not an Identity field
        public bool Identity
        {
            get { return false;
 }
        }
        // This field is read only
        public bool IsReadOnly
        {
            get { return true;
 }
        }
        // This field is unique
        public bool IsUnique
        {
            get { return true;
 }
        }
        // This field can't be longer than 20
        public int Length
        {
            get { return 20; }
        }
        // This field can't be null
        public bool Nullable
        {
            get { return false;
 }
        }
        // This is a Primary Key
        public bool PrimaryKey
        {
            get { return true;
 }
        }

        // These properties do not apply
        public int Precision
        {
            get { return -1; }
        }
        public int Scale
        {
            get { return -1; }
        }
    }
    
    // A custom Field Schema class for Title
    public class CustomTitleFieldSchema : IDataSourceFieldSchema
    {
        public CustomTitleFieldSchema()
        { }

        // Name is Title
        public string Name
        {
            get { return "Title";
 }
        }
        // Type is string
        public Type DataType
        {
            get { return typeof(string);
 }
        }
        // This is not an Identity field
        public bool Identity
        {
            get { return false;
 }
        }
        // This field is not read only
        public bool IsReadOnly
        {
            get { return false;
 }
        }
        // This field is not unique
        public bool IsUnique
        {
            get { return false;
 }
        }
        // This field can't be longer than 100
        public int Length
        {
            get { return 100; }
        }
        // This field can't be null
        public bool Nullable
        {
            get { return false;
 }
        }
        // This is not the Primary Key
        public bool PrimaryKey
        {
            get { return false;
 }
        }

        // These properties do not apply
        public int Precision
        {
            get { return -1; }
        }
        public int Scale
        {
            get { return -1; }
        }
    }
}
<br /><span space="preserve">...</span><br /><%@
 Page Language="C#" %>
<%@ Register TagPrefix="aspSample" Namespace="ASPNet.Design.Samples_CS"
 %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html  >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <aspSample:CustomDataSource ID="CustomDS1" 
        runat=server></aspSample:CustomDataSource>
    <asp:GridView ID="GridView1" runat="server"></asp:GridView>
    
    </div>
    </form>
</body>
</html>
.NET Framework のセキュリティ.NET Frameworkセキュリティ
継承階層継承階層
System.Object
   System.ComponentModel.Design.ComponentDesigner
     System.Web.UI.Design.HtmlControlDesigner
       System.Web.UI.Design.ControlDesigner
        System.Web.UI.Design.DataSourceDesigner
           System.Web.UI.Design.WebControls.ObjectDataSourceDesigner
           System.Web.UI.Design.WebControls.SqlDataSourceDesigner
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバ場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照



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