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FileDialogPermission コンストラクタ (FileDialogPermissionAccess)

アクセス権を指定して、FileDialogPermission クラスの新しいインスタンスを初期化します。

名前空間: System.Security.Permissions
アセンブリ: mscorlib (mscorlib.dll 内)

構文

'宣言
Public Sub New ( _
    access As FileDialogPermissionAccess _
)
'使用
Dim access As FileDialogPermissionAccess

Dim instance As New FileDialogPermission(access)

public FileDialogPermission (
    FileDialogPermissionAccess access
)

public:
FileDialogPermission (
    FileDialogPermissionAccess access
)

public FileDialogPermission (
    FileDialogPermissionAccess access
)

public function FileDialogPermission (
    access : FileDialogPermissionAccess
)

適用できません。

パラメータ

例外

例外の種類 条件

ArgumentException

access パラメータが、FileDialogPermissionAccess 値の有効な組み合わせではありません。

使用例

FileDialogPermission クラスの宣言形式および強制形式を示すコード例を次に示します。ダイアログを表示する最初の試行は成功しますが、その後の試行は、Main メソッドから発行された Deny のために失敗します。宣言セキュリティは、クラス内のコードを実行するための最小限のアクセス許可を要求するためにクラスで使用されます。

Imports System
Imports System.Security
Imports System.Security.Permissions
Imports System.Windows.Forms
Imports System.IO

' Declare FileDialogPermissionAttribute declaratively to request minimum
' permissions for the code in this class to run.
<Assembly: FileDialogPermissionAttribute( _
    SecurityAction.RequestMinimum, Open:=True)> 

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private fileStream As Stream

    ' Event handler for Run button.
    Private Sub Button1_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

        tbxOutput.Cursor = Cursors.WaitCursor
        tbxOutput.Text = ""

        tbxOutput.AppendText("Opened file " + OpenFile() + vbCrLf)

        ' Deny permission to use of the Open dialog box.
        Dim dialogPermission As _
            New FileDialogPermission(FileDialogPermissionAccess.Open)

        dialogPermission.Deny()

        OpenFile()
        CloseStream()

        ' Align interface and conclude application.
        tbxOutput.AppendText(vbCrLf + "This sample completed " + _
            "successfully; press Exit to continue.")

        ' Reset the cursor.
        tbxOutput.Cursor = Cursors.Default
    End Sub
    ' Display open dialog box, store the file stream of the specified file
    ' in the fileStream member variable.
    Private Function OpenFile() As String
        Dim fileName As String

        Dim openDialogBox As New OpenFileDialog
        openDialogBox.InitialDirectory = "c:\"
        openDialogBox.Filter = "txt files (*.txt)|*.txt"
        openDialogBox.RestoreDirectory = True

        Try
            ' If user selects OK, store file name and stream.
            If (openDialogBox.ShowDialog() = DialogResult.OK) Then
                fileName = openDialogBox.FileName
                fileStream = openDialogBox.OpenFile()
                fileStream.Close()
            End If

        Catch ex As Exception
            tbxOutput.AppendText(ex.Message + vbCrLf)
        End Try

        openDialogBox.Dispose()

        ' Return specified file name.
        Return fileName

    End Function
    ' Close the file stream.
    Private Sub CloseStream()
        If Not fileStream Is Nothing Then
            fileStream.Close()
        End If
    End Sub

    ' Event handler for Exit button.
    Private Sub Button2_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click

        Application.Exit()
    End Sub
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Panel2 As System.Windows.Forms.Panel
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbxOutput = New System.Windows.Forms.RichTextBox
        Me.Panel2.SuspendLayout()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        '
        'Panel2
        '
        Me.Panel2.Controls.Add(Me.Button1)
        Me.Panel2.Controls.Add(Me.Button2)
        Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel2.DockPadding.All = 20
        Me.Panel2.Location = New System.Drawing.Point(0, 320)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(616, 64)
        Me.Panel2.TabIndex = 1
        '
        'Button1
        '
        Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button1.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(446, 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "&Run"
        '
        'Button2
        '
        Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button2.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(521, 20)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(75, 24)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "E&xit"
        '
        'Panel1
        '
        Me.Panel1.Controls.Add(Me.tbxOutput)
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.Panel1.DockPadding.All = 20
        Me.Panel1.Location = New System.Drawing.Point(0, 0)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(616, 320)
        Me.Panel1.TabIndex = 2
        '
        'tbxOutput
        '
        Me.tbxOutput.AccessibleDescription = _
            "Displays output from application."
        Me.tbxOutput.AccessibleName = "Output textbox."
        Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
        Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
        Me.tbxOutput.Name = "tbxOutput"
        Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
        Me.tbxOutput.TabIndex = 1
        Me.tbxOutput.Text = "Click the Run button to run the application."
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(616, 384)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "FileDialogPermission"
        Me.Panel2.ResumeLayout(False)
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region
End Class
'
' This sample produces the following output:
'
' Opened file C:\testfile.txt
' Request for the permission of type 
' System.Security.Permissions.FileDialogPermission, mscorlib, 
' Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.
'
' This sample completed successfully; press Exit to continue.

using System;
using System.Security;
using System.Security.Permissions;
using System.Windows.Forms;
using System.IO;

// Add the declarative FileDialogPermissionAttribute to request minimum
// permissions for the code in this class to run.
[assembly:FileDialogPermissionAttribute(
    SecurityAction.RequestMinimum, 
    Open=true)]
public class DialogPermissions
{
    private Stream fileStream;

    public static void Main()
    {
        DialogPermissions dialogAccess = new DialogPermissions();
        Console.WriteLine("Opened file " + dialogAccess.OpenFile());

        // Deny permission to use of the Open dialog box.
        FileDialogPermission dialogPermission = 
            new FileDialogPermission(FileDialogPermissionAccess.Open);

        dialogPermission.Deny();

        dialogAccess.OpenFile();
        dialogAccess.CloseStream();

    }

    // Display open dialog box, store the file stream of the specified file
    // in the fileStream member variable.
    private string OpenFile()
    {
        string fileName = null;

        OpenFileDialog openDialogBox = new OpenFileDialog();
        openDialogBox.InitialDirectory = "c:\\";
        openDialogBox.Filter = "txt files (*.txt)|*.txt";
        openDialogBox.RestoreDirectory = true;
        try
        {
            // If user selects OK, store file name and stream.
            if(openDialogBox.ShowDialog() == DialogResult.OK)
            {
                fileName = openDialogBox.FileName;
                fileStream = openDialogBox.OpenFile();
                fileStream.Close();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }

        openDialogBox.Dispose();

        // Return specified file name.
        return fileName;
    }

    // Close the file stream.
    private void CloseStream()
    {
        if (fileStream != null)
        {
            fileStream.Close();
        }
    }
}
//
// This sample produces the following output:
//
// Opened file C:\testfile.txt
// Request for the permission of type 
// System.Security.Permissions.FileDialogPermission, mscorlib, 
// Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 
// failed.
//
// This sample completed successfully; press Exit to continue.

import System.*;
import System.Security.*;
import System.Security.Permissions.*;
import System.Windows.Forms.*;
import System.IO.*;

// Add the declarative FileDialogPermissionAttribute to request minimum
// permissions for the code in this class to run.
/** @assembly FileDialogPermissionAttribute(SecurityAction.RequestMinimum,
    Open = true)
 */
public class DialogPermissions
{    
    private Stream fileStream;

    public static void main(String[] args)
    {
        DialogPermissions dialogAccess = new DialogPermissions();
        Console.WriteLine("Opened file " + dialogAccess.OpenFile());

        // Deny permission to use of the Open dialog box.
        FileDialogPermission dialogPermission = 
            new FileDialogPermission(FileDialogPermissionAccess.Open);
        dialogPermission.Deny();

        dialogAccess.OpenFile();
        dialogAccess.CloseStream();
    } //main

    // Display open dialog box, store the file stream of the specified file
    // in the fileStream member variable.
    private String OpenFile()
    {
        String fileName = null;

        OpenFileDialog openDialogBox = new OpenFileDialog();
        openDialogBox.set_InitialDirectory("c:\\");
        openDialogBox.set_Filter("txt files (*.txt)|*.txt");
        openDialogBox.set_RestoreDirectory(true);
        try {
            // If user selects OK, store file name and stream.
            if (openDialogBox.ShowDialog().Equals(DialogResult.OK)) {
                fileName = openDialogBox.get_FileName();
                fileStream = openDialogBox.OpenFile();
                fileStream.Close();
            }
        }
        catch (System.Exception ex) {
            Console.WriteLine(ex.get_Message());
        }
        openDialogBox.Dispose();
        // Return specified file name.
        return fileName;
    } //OpenFile

    // Close the file stream.
    private void CloseStream()
    {
        if (fileStream != null) {
            fileStream.Close();
        }
    } //CloseStream
} //DialogPermissions
//
// This sample produces the following output:
//
// Opened file C:\testfile.txt
// Request for the permission of type 
// System.Security.Permissions.FileDialogPermission, mscorlib, 
// Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 
// failed.
//
// This sample completed successfully; press Exit to continue.

プラットフォーム

Windows 98,Windows Server 2000 SP4,Windows CE,Windows Millennium Edition,Windows Mobile for Pocket PC,Windows Mobile for Smartphone,Windows Server 2003,Windows XP Media Center Edition,Windows XP Professional x64 Edition,Windows XP SP2,Windows XP Starter Edition

Microsoft .NET Framework 3.0 は Windows Vista,Microsoft Windows XP SP2,および Windows Server 2003 SP1 でサポートされています。

バージョン情報

.NET Framework

サポート対象 : 3.0,2.0,1.1,1.0

参照

関連項目

FileDialogPermission クラス
FileDialogPermission メンバ
System.Security.Permissions 名前空間