FileDialogPermission.Copy 方法
创建并返回当前权限的相同副本。
**命名空间:**System.Security.Permissions
**程序集:**mscorlib(在 mscorlib.dll 中)
语法
声明
Public Overrides Function Copy As IPermission
用法
Dim instance As FileDialogPermission
Dim returnValue As IPermission
returnValue = instance.Copy
public override IPermission Copy ()
public:
virtual IPermission^ Copy () override
public IPermission Copy ()
public override function Copy () : IPermission
返回值
当前权限的副本。
备注
权限副本对资源具有与原始权限相同的访问权限。
示例
下面的代码示例旨在演示 Copy 方法的行为,而不演示其用法。一般情况下,权限类的方法由安全性基础结构使用,而不在应用程序中使用。但是,下面的代码示例将演示在从您的代码执行该方法时,该方法将如何执行。有关完整的代码示例,请参见 FileDialogPermission 类。
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
private bool CopyDemo()
{
bool returnValue = true;
fileDialogPerm2 = (FileDialogPermission)fileDialogPerm1.Copy();
Console.WriteLine("Result of copy = " + fileDialogPerm2.ToString());
return returnValue;
}
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;
}
// 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
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 类
FileDialogPermission 成员
System.Security.Permissions 命名空间