FileDialogPermission 类
控制通过文件对话框访问文件或文件夹的能力。无法继承此类。
**命名空间:**System.Security.Permissions
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class FileDialogPermission
Inherits CodeAccessPermission
Implements IUnrestrictedPermission
用法
Dim instance As FileDialogPermission
[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class FileDialogPermission : CodeAccessPermission, IUnrestrictedPermission
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class FileDialogPermission sealed : public CodeAccessPermission, IUnrestrictedPermission
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public final class FileDialogPermission extends CodeAccessPermission implements IUnrestrictedPermission
SerializableAttribute
ComVisibleAttribute(true)
public final class FileDialogPermission extends CodeAccessPermission implements IUnrestrictedPermission
备注
该权限通常用于在未授予 FileIOPermission 时，提供对用户指定文件的有限访问权限。
示例
下面的代码示例演示 FileDialogPermission 类方法的行为。该示例旨在演示方法的结果，而不演示通常是如何使用这些方法的。有关演示如何使用 FileDialogPermission 类要求特定 FileDialogPermissionAccess 枚举值的权限的示例，请参见 FileDialogPermission(FileDialogPermissionAccess) 构造函数。
Imports System
Imports System.Security
Imports System.Security.Permissions
<assembly: CLSCompliant(True)>
Public Class FileDialogPermissionDemo
Private fileDialogPerm1 As New FileDialogPermission(FileDialogPermissionAccess.Open)
Private fileDialogPerm2 As New FileDialogPermission(FileDialogPermissionAccess.OpenSave)
Private fileDialogPerm3 As New FileDialogPermission(PermissionState.None)
' IsSubsetOf determines whether the current permission is a subset of the
' specified permission.
Private Function IsSubsetOfDemo() As Boolean
Dim returnValue As Boolean = True
If fileDialogPerm1.IsSubsetOf(fileDialogPerm2) Then
Console.WriteLine(fileDialogPerm1.Access.ToString() + " is a subset of " _
+ fileDialogPerm2.Access.ToString())
Else
Console.WriteLine(fileDialogPerm1.Access.ToString + " is not a subset of " + _
fileDialogPerm2.Access.ToString())
End If
Return returnValue
End Function 'IsSubsetOfDemo
' Union creates a new permission that is the union of the current permission and the
' specified permission.
Private Function UnionDemo() As Boolean
Dim returnValue As Boolean = True
fileDialogPerm3 = CType(fileDialogPerm1.Union(fileDialogPerm2), FileDialogPermission)
If fileDialogPerm3 Is Nothing Then
Console.WriteLine("The union of " + fileDialogPerm1.Access.ToString() + _
" and " + fileDialogPerm2.Access.ToString() + " is null.")
Else
Console.WriteLine("The union of " + fileDialogPerm1.Access.ToString() + _
" and " + fileDialogPerm2.Access.ToString() + " = " + _
CType(fileDialogPerm3, FileDialogPermission).Access.ToString())
End If
Return returnValue
End Function 'UnionDemo
' Intersect creates and returns a new permission that is the intersection of the current
' permission and the permission specified.
Private Function IntersectDemo() As Boolean
Dim returnValue As Boolean = True
fileDialogPerm3 = CType(fileDialogPerm1.Intersect(fileDialogPerm2), FileDialogPermission)
If Not (fileDialogPerm3 Is Nothing) Then
Console.WriteLine("The intersection of " + fileDialogPerm1.Access.ToString() + " and " _
+ fileDialogPerm2.Access.ToString() + " = " + CType(fileDialogPerm3, _
FileDialogPermission).Access.ToString())
Else
Console.WriteLine("The intersection of " + fileDialogPerm1.Access.ToString() + " and " + _
fileDialogPerm2.Access + " is null.")
End If
Return returnValue
End Function 'IntersectDemo
' Copy creates and returns an identical copy of the current permission.
Private Function CopyDemo() As Boolean
Dim returnValue As Boolean = True
fileDialogPerm2 = CType(fileDialogPerm1.Copy(), FileDialogPermission)
Console.WriteLine("Result of copy = " + fileDialogPerm2.ToString())
Return returnValue
End Function 'CopyDemo
' ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
' permission with the specified state from the XML encoding.
Private Function ToFromXmlDemo() As Boolean
Dim returnValue As Boolean = True
fileDialogPerm2 = New FileDialogPermission(PermissionState.None)
fileDialogPerm2.FromXml(fileDialogPerm1.ToXml())
Console.WriteLine("Result of ToFromXml = " + fileDialogPerm2.ToString())
Return returnValue
End Function 'ToFromXmlDemo
' Invoke all demos.
Public Function RunDemo() As Boolean
Dim returnCode As Boolean = True
Dim tempReturnCode As Boolean
' Call the IsSubsetOf demo.
If IsSubsetOfDemo() Then
Console.Out.WriteLine("IsSubsetOf demo completed successfully.")
tempReturnCode = True
Else
Console.Out.WriteLine("IsSubsetOf demo failed.")
tempReturnCode = False
End If
returnCode = tempReturnCode And returnCode
' Call the Union demo.
If UnionDemo() Then
Console.Out.WriteLine("Union demo completed successfully.")
tempReturnCode = True
Else
Console.Out.WriteLine("Union demo failed.")
tempReturnCode = False
End If
returnCode = tempReturnCode And returnCode
' Call the Intersect demo.
If IntersectDemo() Then
Console.Out.WriteLine("Intersect demo completed successfully.")
tempReturnCode = True
Else
Console.Out.WriteLine("Intersect demo failed.")
tempReturnCode = False
End If
returnCode = tempReturnCode And returnCode
' Call the Copy demo.
If CopyDemo() Then
Console.Out.WriteLine("Copy demo completed successfully.")
tempReturnCode = True
Else
Console.Out.WriteLine("Copy demo failed.")
tempReturnCode = False
End If
returnCode = tempReturnCode And returnCode
' Call the ToFromXml demo.
If ToFromXmlDemo() Then
Console.Out.WriteLine("ToFromXml demo completed successfully.")
tempReturnCode = True
Else
Console.Out.WriteLine("ToFromXml demo failed.")
tempReturnCode = False
End If
returnCode = tempReturnCode And returnCode
Return returnCode
End Function
' Test harness.
Public Shared Sub Main(ByVal args() As String)
Try
Dim democase As New FileDialogPermissionDemo()
Dim returnCode As Boolean = democase.RunDemo()
If returnCode Then
Console.Out.WriteLine("FileDialogPermission demo completed successfully.")
Console.Out.WriteLine("Press the Enter key to exit.")
Dim consoleInput As String = Console.ReadLine()
System.Environment.ExitCode = 100
Else
Console.Out.WriteLine("FileDialogPermission demo failed.")
Console.Out.WriteLine("Press the Enter key to exit.")
Dim consoleInput As String = Console.ReadLine()
System.Environment.ExitCode = 101
End If
Catch e As Exception
Console.Out.WriteLine("FileDialogPermission failed.")
Console.WriteLine(e.ToString())
Console.Out.WriteLine("Press the Enter key to exit.")
Dim consoleInput As String = Console.ReadLine()
System.Environment.ExitCode = 101
End Try
End Sub 'Main
End Class 'FileDialogPermissionDemo
using System;
using System.Security;
using System.Security.Permissions;
[assembly: CLSCompliant(true)]
public class FileDialogPermissionDemo
{
FileDialogPermission fileDialogPerm1 = new FileDialogPermission(FileDialogPermissionAccess.Open);
FileDialogPermission fileDialogPerm2 = new FileDialogPermission(FileDialogPermissionAccess.OpenSave);
FileDialogPermission fileDialogPerm3 = new FileDialogPermission(PermissionState.None);
// IsSubsetOf determines whether the current permission is a subset of the
// specified permission.
private bool IsSubsetOfDemo()
{
bool returnValue = true;
if (fileDialogPerm1.IsSubsetOf(fileDialogPerm2))
{
Console.WriteLine(fileDialogPerm1.Access + " is a subset of " +
fileDialogPerm2.Access);
}
else
{
Console.WriteLine(fileDialogPerm1.Access + " is not a subset of " +
fileDialogPerm2.Access);
}
return returnValue;
}
// Union creates a new permission that is the union of the current permission and the
// specified permission.
private bool UnionDemo()
{
bool returnValue = true;
fileDialogPerm3 = (FileDialogPermission)fileDialogPerm1.Union(fileDialogPerm2);
if (fileDialogPerm3 == null)
{
Console.WriteLine("The union of " + fileDialogPerm1.Access +
" and " + fileDialogPerm2.Access + " is null.");
}
else
{
Console.WriteLine("The union of " + fileDialogPerm1.Access + " and " +
fileDialogPerm2.Access + " = " +
((FileDialogPermission)fileDialogPerm3).Access.ToString());
}
return returnValue;
}
// Intersect creates and returns a new permission that is the intersection of the current
// permission and the permission specified.
private bool IntersectDemo()
{
bool returnValue = true;
fileDialogPerm3 = (FileDialogPermission)fileDialogPerm1.Intersect(fileDialogPerm2);
if (fileDialogPerm3 != null)
{
Console.WriteLine("The intersection of " + fileDialogPerm1.Access +
" and " + fileDialogPerm2.Access + " = " +
((FileDialogPermission)fileDialogPerm3).Access.ToString());
}
else
{
Console.WriteLine("The intersection of " + fileDialogPerm1.Access +
" and " + fileDialogPerm2.Access + " is null.");
}
return returnValue;
}
// Copy creates and returns an identical copy of the current permission.
private bool CopyDemo()
{
bool returnValue = true;
fileDialogPerm2 = (FileDialogPermission)fileDialogPerm1.Copy();
Console.WriteLine("Result of copy = " + fileDialogPerm2.ToString());
return returnValue;
}
// ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
// permission with the specified state from the XML encoding.
private bool ToFromXmlDemo()
{
bool returnValue = true;
fileDialogPerm2 = new FileDialogPermission(PermissionState.None);
fileDialogPerm2.FromXml(fileDialogPerm1.ToXml());
Console.WriteLine("Result of ToFromXml = " +
fileDialogPerm2.ToString());
return returnValue;
}
// Invoke all demos.
public bool RunDemo()
{
bool returnCode = true;
bool tempReturnCode;
// Call IsSubsetOf demo.
if (tempReturnCode = IsSubsetOfDemo()) Console.Out.WriteLine("IsSubsetOf demo completed successfully.");
else Console.Out.WriteLine("IsSubsetOf demo failed.");
returnCode = tempReturnCode && returnCode;
// Call Union demo.
if (tempReturnCode = UnionDemo()) Console.Out.WriteLine("Union demo completed successfully.");
else Console.Out.WriteLine("Union demo failed.");
returnCode = tempReturnCode && returnCode;
// Call Intersect demo.
if (tempReturnCode = IntersectDemo()) Console.Out.WriteLine("Intersect demo completed successfully.");
else Console.Out.WriteLine("Intersect demo failed.");
returnCode = tempReturnCode && returnCode;
// Call Copy demo.
if (tempReturnCode = CopyDemo()) Console.Out.WriteLine("Copy demo completed successfully.");
else Console.Out.WriteLine("Copy demo failed.");
returnCode = tempReturnCode && returnCode;
// Call ToFromXml demo.
if (tempReturnCode = ToFromXmlDemo()) Console.Out.WriteLine("ToFromXml demo completed successfully.");
else Console.Out.WriteLine("ToFromXml demo failed.");
returnCode = tempReturnCode && returnCode;
return (returnCode);
}
// Test harness.
public static void Main(String[] args)
{
try
{
FileDialogPermissionDemo democase = new FileDialogPermissionDemo();
bool returnCode = democase.RunDemo();
if (returnCode)
{
Console.Out.WriteLine("FileDialogPermission demo completed successfully.");
Console.Out.WriteLine("Press the Enter key to exit.");
string consoleInput = Console.ReadLine();
System.Environment.ExitCode = 100;
}
else
{
Console.Out.WriteLine("FileDialogPermission demo failed.");
Console.Out.WriteLine("Press the Enter key to exit.");
string consoleInput = Console.ReadLine();
System.Environment.ExitCode = 101;
}
}
catch (Exception e)
{
Console.Out.WriteLine("FileDialogPermission failed.");
Console.WriteLine(e.ToString());
Console.Out.WriteLine("Press the Enter key to exit.");
string consoleInput = Console.ReadLine();
System.Environment.ExitCode = 101;
}
}
}
using namespace System::Runtime::InteropServices;
using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
// This class generates FileDialogPermission objects.
[assembly:CLSCompliant(true)];
public ref class FileDialogPermissionDemo
{
private:
// IsSubsetOf determines whether the current permission is a subset of the
// specified permission.
bool IsSubsetOfDemo()
{
bool returnValue = true;
FileDialogPermission^ fileDialogIdPerm1 = gcnew FileDialogPermission(FileDialogPermissionAccess::Open );
FileDialogPermission^ fileDialogIdPerm2 = gcnew FileDialogPermission( FileDialogPermissionAccess::OpenSave );
if ( fileDialogIdPerm1->IsSubsetOf( fileDialogIdPerm2 ) )
{
Console::WriteLine( "{0} is a subset of {1}", fileDialogIdPerm1->Access, fileDialogIdPerm2->Access );
}
else
{
Console::WriteLine( "{0} is not a subset of {1}", fileDialogIdPerm1->Access, fileDialogIdPerm2->Access );
}
return returnValue;
}
// Union creates a new permission that is the union of the current permission and the
// specified permission.
bool UnionDemo()
{
bool returnValue = true;
FileDialogPermission^ fileDialogIdPerm1 = gcnew FileDialogPermission(FileDialogPermissionAccess::Open );
FileDialogPermission^ fileDialogIdPerm2 = gcnew FileDialogPermission( FileDialogPermissionAccess::OpenSave );
FileDialogPermission^ fileDialogIdPerm3 = gcnew FileDialogPermission(PermissionState::None);
fileDialogIdPerm3 = dynamic_cast<FileDialogPermission^>(fileDialogIdPerm1->Union( fileDialogIdPerm2 ));
if ( fileDialogIdPerm3 == nullptr )
{
Console::WriteLine( "The union of {0} and {1} is null.",
fileDialogIdPerm1->Access, fileDialogIdPerm2->Access );
}
else
{
Console::WriteLine( "The union of {0} and {1} = {2}",
fileDialogIdPerm1->Access, fileDialogIdPerm2->Access, (dynamic_cast<FileDialogPermission^>(fileDialogIdPerm3))->Access );
}
return returnValue;
}
// Intersect creates and returns a new permission that is the intersection of the current
// permission and the permission specified.
bool IntersectDemo()
{
bool returnValue = true;
FileDialogPermission^ fileDialogIdPerm1 =
gcnew FileDialogPermission(FileDialogPermissionAccess::Open );
FileDialogPermission^ fileDialogIdPerm2 =
gcnew FileDialogPermission( FileDialogPermissionAccess::OpenSave );
FileDialogPermission^ fileDialogIdPerm3 =
gcnew FileDialogPermission(PermissionState::None);
//Console.WriteLine("\tfileDialogIdPerm2 = " +fileDialogIdPerm2.ToString());
fileDialogIdPerm3 = dynamic_cast<FileDialogPermission^>(fileDialogIdPerm1->Intersect( fileDialogIdPerm2 ));
if ( fileDialogIdPerm3 != nullptr )
{
Console::WriteLine( "The intersection of {0} and {1} = {2}",
fileDialogIdPerm1->Access, fileDialogIdPerm2->Access, (dynamic_cast<FileDialogPermission^>(fileDialogIdPerm3))->Access );
}
else
{
Console::WriteLine( "The intersection of {0} and {1} is null.",
fileDialogIdPerm1->Access, fileDialogIdPerm2->Access );
}
return returnValue;
}
// Copy creates and returns an identical copy of the current permission.
bool CopyDemo()
{
bool returnValue = true;
FileDialogPermission^ fileDialogIdPerm1 = gcnew FileDialogPermission(FileDialogPermissionAccess::Open );
FileDialogPermission^ fileDialogIdPerm2 = gcnew FileDialogPermission( FileDialogPermissionAccess::OpenSave );
FileDialogPermission^ fileDialogIdPerm3 = gcnew FileDialogPermission(PermissionState::None);
fileDialogIdPerm2 = dynamic_cast<FileDialogPermission^>(fileDialogIdPerm1->Copy());
Console::WriteLine( "Result of copy = {0}", fileDialogIdPerm2 );
return returnValue;
}
// ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
// permission with the specified state from the XML encoding.
bool ToFromXmlDemo()
{
bool returnValue = true;
FileDialogPermission^ fileDialogIdPerm1 = gcnew FileDialogPermission(FileDialogPermissionAccess::Open );
FileDialogPermission^ fileDialogIdPerm2 = gcnew FileDialogPermission( FileDialogPermissionAccess::OpenSave );
FileDialogPermission^ fileDialogIdPerm3 = gcnew FileDialogPermission(PermissionState::None);
fileDialogIdPerm2 = gcnew FileDialogPermission( PermissionState::None );
fileDialogIdPerm2->FromXml( fileDialogIdPerm1->ToXml() );
Console::WriteLine( "Result of ToFromXml = {0}", fileDialogIdPerm2 );
return returnValue;
}
public:
// Invoke all demos.
bool RunDemo()
{
bool returnCode = true;
bool tempReturnCode;
// Call IsSubsetOf demo.
if ( tempReturnCode = IsSubsetOfDemo() )
Console::WriteLine( "IsSubsetOf demo completed successfully." );
else
Console::WriteLine( "IsSubsetOf demo failed." );
returnCode = tempReturnCode && returnCode;
// Call Union demo.
if ( tempReturnCode = UnionDemo() )
Console::WriteLine( "Union demo completed successfully." );
else
Console::WriteLine( "Union demo failed." );
returnCode = tempReturnCode && returnCode;
// Call Intersect demo.
if ( tempReturnCode = IntersectDemo() )
Console::WriteLine( "Intersect demo completed successfully." );
else
Console::WriteLine( "Intersect demo failed." );
returnCode = tempReturnCode && returnCode;
// Call Copy demo.
if ( tempReturnCode = CopyDemo() )
Console::WriteLine( "Copy demo completed successfully." );
else
Console::WriteLine( "Copy demo failed." );
returnCode = tempReturnCode && returnCode;
// Call ToFromXml demo.
if ( tempReturnCode = ToFromXmlDemo() )
Console::WriteLine( "ToFromXml demo completed successfully." );
else
Console::WriteLine( "ToFromXml demo failed." );
returnCode = tempReturnCode && returnCode;
return (returnCode);
}
};
// Test harness.
int main()
{
try
{
FileDialogPermissionDemo^ democase = gcnew FileDialogPermissionDemo;
bool returnCode = democase->RunDemo();
if ( returnCode )
{
Console::WriteLine( "FileDialogPermission demo completed successfully." );
Console::WriteLine( "Press the Enter key to exit." );
Console::ReadLine();
System::Environment::ExitCode = 100;
}
else
{
Console::WriteLine( "FileDialogPermission demo failed." );
Console::WriteLine( "Press the Enter key to exit." );
Console::ReadLine();
System::Environment::ExitCode = 101;
}
}
catch ( Exception^ e )
{
Console::WriteLine( "FileDialogPermission failed." );
Console::WriteLine( e );
Console::WriteLine( "Press the Enter key to exit." );
Console::ReadLine();
System::Environment::ExitCode = 101;
}
}
// This sample demonstrates the IsSubsetOf, Union, Intersect, Copy,
// ToXml and FromXml methods
// of the FileDialogPermission class.
import System .* ;
import System.Security .* ;
import System.Security.Permissions .* ;
/** @assembly CLSCompliant(true)
*/
public class FileDialogPermissionDemo
{
// IsSubsetOf determines whether the current permission is a subset of the
// specified permission.
private boolean IsSubsetOfDemo()
{
boolean returnValue = true;
FileDialogPermissionAccess fileDialog1[] =
new FileDialogPermissionAccess[1];
FileDialogPermissionAccess fileDialog2[] =
new FileDialogPermissionAccess[1];
FileDialogPermission fileDialogIdPerm1[] =
new FileDialogPermission[1];
FileDialogPermission fileDialogIdPerm2[] =
new FileDialogPermission[1];
FileDialogGenerator fileDialogGen1 =
new FileDialogGenerator();
FileDialogGenerator fileDialogGen2 =
new FileDialogGenerator();
fileDialogGen1.ResetIndex();
while(fileDialogGen1.CreateFileDialog
(fileDialogIdPerm1, fileDialog1)) {
if (fileDialogIdPerm1[0] == null) {
continue ;
}
fileDialogGen2.ResetIndex();
Console.WriteLine("**********************"
+ "**********************************\n");
while(fileDialogGen2.CreateFileDialog(
fileDialogIdPerm2, fileDialog2)) {
if (fileDialogIdPerm2[0] == null) {
continue ;
}
try {
if (fileDialogIdPerm1[0].
IsSubsetOf(fileDialogIdPerm2[0])) {
Console.WriteLine((fileDialogIdPerm1[0].get_Access()
+ " is a subset of "
+ fileDialogIdPerm2[0].get_Access()));
}
else {
Console.WriteLine((fileDialogIdPerm1[0].get_Access()
+ " is not a subset of " +
fileDialogIdPerm2[0].get_Access()));
}
}
catch(System.Exception e){
Console.WriteLine(("An exception was thrown "
+ "for subset :" + fileDialogIdPerm1[0]
+ "\n" + fileDialogIdPerm2[0] + "\n" + e));
returnValue = false;
}
}
}
return returnValue ;
} //IsSubsetOfDemo
// Union creates a new permission that is the union of
// the current permission and the
// specified permission.
private boolean UnionDemo()
{
boolean returnValue = true;
FileDialogPermissionAccess fileDialog1[] =
new FileDialogPermissionAccess[1];
FileDialogPermissionAccess fileDialog2[] =
new FileDialogPermissionAccess[1];
FileDialogPermission fileDialogIdPerm1[] =
new FileDialogPermission[1];
FileDialogPermission fileDialogIdPerm2[] =
new FileDialogPermission[1];
IPermission fileDialogIdPerm3;
FileDialogGenerator fileDialogGen1 =
new FileDialogGenerator();
FileDialogGenerator fileDialogGen2 =
new FileDialogGenerator();
fileDialogGen1.ResetIndex();
while(fileDialogGen1.CreateFileDialog(fileDialogIdPerm1,
fileDialog1)) {
if (fileDialogIdPerm1[0] == null) {
continue ;
}
Console.WriteLine("************************"
+ "**********************************\n");
fileDialogGen2.ResetIndex();
while(fileDialogGen2.CreateFileDialog(fileDialogIdPerm2,
fileDialog2)) {
if (fileDialogIdPerm2[0] == null) {
continue ;
}
fileDialogIdPerm3 =((FileDialogPermission)(
fileDialogIdPerm1[0].Union(fileDialogIdPerm2[0])));
fileDialogIdPerm3 = fileDialogIdPerm1[0].
Union(fileDialogIdPerm2[0]);
if (fileDialogIdPerm3 == null) {
Console.WriteLine(("The union of " + fileDialog1[0]
+ " and " + fileDialog2[0] + " is null."));
}
else {
Console.WriteLine(("The union of "
+ fileDialogIdPerm1[0].get_Access() + " and "
+ fileDialogIdPerm2[0].get_Access() + " = "
+ ((FileDialogPermission)(fileDialogIdPerm3)).
get_Access().ToString()));
}
}
}
return returnValue ;
} //UnionDemo
// Intersect creates and returns a new permission that is the
// intersection of the current
// permission and the permission specified.
private boolean IntersectDemo()
{
boolean returnValue = true;
FileDialogPermissionAccess fileDialog1[] =
new FileDialogPermissionAccess[1];
FileDialogPermissionAccess fileDialog2[] =
new FileDialogPermissionAccess[1];
FileDialogPermission fileDialogIdPerm1[] =
new FileDialogPermission[1];
FileDialogPermission fileDialogIdPerm2[] =
new FileDialogPermission[1];
FileDialogPermission fileDialogIdPerm3 = null;
FileDialogGenerator fileDialogGen1 =
new FileDialogGenerator();
FileDialogGenerator fileDialogGen2 =
new FileDialogGenerator();
fileDialogGen1.ResetIndex();
while(fileDialogGen1.CreateFileDialog(
fileDialogIdPerm1, fileDialog1)) {
if (fileDialogIdPerm1[0] == null) {
continue ;
}
Console.WriteLine("***************************"
+ "*******************************\n");
fileDialogGen2.ResetIndex();
while(fileDialogGen2.CreateFileDialog(
fileDialogIdPerm2, fileDialog2)) {
if (fileDialogIdPerm2[0] == null) {
continue ;
}
fileDialogIdPerm3 =((FileDialogPermission)
(fileDialogIdPerm1[0].Intersect
(fileDialogIdPerm2[0])));
if (fileDialogIdPerm3 != null) {
Console.WriteLine(("The intersection of "
+ fileDialog1[0] + " and " + fileDialog2[0]
+ " = " +((FileDialogPermission)(fileDialogIdPerm3)).
get_Access().ToString()));
}
else {
Console.WriteLine(("The intersection of "
+ fileDialog1[0] + " and " + fileDialog2[0]
+ " is null."));
}
}
}
return returnValue ;
} //IntersectDemo
// Copy creates and returns an identical copy of the current permission.
private boolean CopyDemo()
{
boolean returnValue = true;
FileDialogPermissionAccess fileDialog1[] =
new FileDialogPermissionAccess[1];
FileDialogPermission fileDialogIdPerm1[] =
new FileDialogPermission[1];
FileDialogPermission fileDialogIdPerm2[] =
new FileDialogPermission[1];
FileDialogGenerator fileDialogGen1 =
new FileDialogGenerator();
FileDialogGenerator fileDialogGen2 =
new FileDialogGenerator();
fileDialogGen1.ResetIndex();
while(fileDialogGen1.CreateFileDialog(fileDialogIdPerm1,
fileDialog1)) {
if ( fileDialogIdPerm1[0] == null ) {
continue ;
}
fileDialogGen2.ResetIndex();
Console.WriteLine("************************"
+ "********************************\n");
try {
fileDialogIdPerm2[0] =(
(FileDialogPermission)(fileDialogIdPerm1[0].Copy()));
Console.WriteLine(("Result of copy = "
+ fileDialogIdPerm2[0].ToString()));
}
catch(System.Exception e) {
Console.WriteLine(("Copy failed :"
+ fileDialogIdPerm1[0].ToString() + e));
continue ;
}
}
return returnValue ;
} //CopyDemo
// ToXml creates an XML encoding of the permission and its current
// state; FromXml reconstructs a
// permission with the specified state from the XML encoding.
private boolean ToFromXmlDemo()
{
boolean returnValue = true;
FileDialogPermissionAccess fileDialog1[] =
new FileDialogPermissionAccess[1];
FileDialogPermission fileDialogIdPerm1[] =
new FileDialogPermission[1];
FileDialogPermission fileDialogIdPerm2[] =
new FileDialogPermission[1];
FileDialogGenerator fileDialogGen1 =
new FileDialogGenerator();
FileDialogGenerator fileDialogGen2 =
new FileDialogGenerator();
fileDialogGen1.ResetIndex();
while(fileDialogGen1.CreateFileDialog(fileDialogIdPerm1,
fileDialog1)) {
if (fileDialogIdPerm1[0] == null) {
continue ;
}
Console.WriteLine("************************"
+ "********************************\n");
fileDialogGen2.ResetIndex();
try {
fileDialogIdPerm2[0] =
new FileDialogPermission(PermissionState.None);
fileDialogIdPerm2[0].FromXml(fileDialogIdPerm1[0].ToXml());
Console.WriteLine(("Result of ToFromXml = "
+ fileDialogIdPerm2[0].ToString()));
}
catch(System.Exception e) {
Console.WriteLine(("ToFromXml failed :"
+ fileDialogIdPerm1[0].ToString() + e));
continue ;
}
}
return returnValue ;
} //ToFromXmlDemo
// Invoke all demos.
public boolean RunDemo()
{
boolean returnCode = true;
boolean tempReturnCode;
// Call IsSubsetOf demo.
if (tempReturnCode = IsSubsetOfDemo()) {
Console.get_Out().WriteLine("IsSubsetOf demo "
+ "completed successfully.");
}
else {
Console.get_Out().WriteLine("IsSubsetOf demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call Union demo.
if (tempReturnCode = UnionDemo()) {
Console.get_Out().WriteLine("Union demo "
+ "completed successfully.");
}
else {
Console.get_Out().WriteLine("Union demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call Intersect demo.
if (tempReturnCode = IntersectDemo()) {
Console.get_Out().WriteLine("Intersect demo completed "
+ "successfully.");
}
else {
Console.get_Out().WriteLine("Intersect demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call Copy demo.
if (tempReturnCode = CopyDemo()) {
Console.get_Out().WriteLine("Copy demo completed "
+ "successfully.");
}
else {
Console.get_Out().WriteLine("Copy demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call ToFromXml demo.
if (tempReturnCode = ToFromXmlDemo()) {
Console.get_Out().WriteLine("ToFromXml demo completed "
+ "successfully.");
}
else {
Console.get_Out().WriteLine("ToFromXml demo failed.");
}
returnCode = tempReturnCode && returnCode;
return returnCode ;
} //RunDemo
// Test harness.
public static void main(String[] args)
{
try {
FileDialogPermissionDemo democase =
new FileDialogPermissionDemo();
boolean returnCode = democase.RunDemo();
if (returnCode) {
Console.get_Out().WriteLine("FileDialogPermission demo "
+ "completed successfully.");
Console.get_Out().WriteLine("Press the Enter key to exit.");
String consoleInput = Console.ReadLine();
System.Environment.set_ExitCode(100);
}
else {
Console.get_Out().WriteLine("FileDialogPermission demo "
+ "failed.");
Console.get_Out().WriteLine("Press the Enter key to exit.");
String consoleInput = Console.ReadLine();
System.Environment.set_ExitCode(101);
}
}
catch(System.Exception e){
Console.get_Out().WriteLine("FileDialogPermission failed.");
Console.WriteLine(e.ToString());
Console.get_Out().WriteLine("Press the Enter key to exit.");
String consoleInput = Console.ReadLine();
System.Environment.set_ExitCode(101);
}
} //main
} //FileDialogPermissionDemo
// This class generates FileDialogPermission objects.
class FileDialogGenerator
{
private FileDialogPermissionAccess myFileDialog[] =
{FileDialogPermissionAccess.None,
FileDialogPermissionAccess.Open,
FileDialogPermissionAccess.OpenSave,
FileDialogPermissionAccess.Save};
private int fileDialogIndex = 0;
public FileDialogGenerator()
{
ResetIndex();
} //FileDialogGenerator
public void ResetIndex()
{
fileDialogIndex = 0;
} //ResetIndex
// Create a FileDialogPermission.
public boolean CreateFileDialog(FileDialogPermission fileDialogPerm[],
FileDialogPermissionAccess fileDialog[])
{
if (fileDialogIndex >= myFileDialog.length) {
fileDialogPerm[0] = new FileDialogPermission(PermissionState.None);
fileDialog[0] = FileDialogPermissionAccess.None;
return false ;
}
fileDialog[0] = myFileDialog[fileDialogIndex++];
try {
fileDialogPerm[0] = new FileDialogPermission(fileDialog[0]);
return true ;
}
catch(System.Exception e) {
Console.WriteLine(("Cannot create FileDialogPermission: "
+ fileDialog + " " + e));
fileDialogPerm[0] = new FileDialogPermission(PermissionState.None);
fileDialog[0] = FileDialogPermissionAccess.None;
return true ;
}
} //CreateFileDialog
} //FileDialogGenerator
继承层次结构
System.Object
System.Security.CodeAccessPermission
System.Security.Permissions.FileDialogPermission
线程安全
此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
FileDialogPermission 成员
System.Security.Permissions 命名空间
FileDialogPermissionAttribute
FileDialogPermissionAccess