通过

FileIOPermission.GetPathList 方法

  • 项目

获取具有指定 FileIOPermissionAccess 的所有文件和目录。

**命名空间:**System.Security.Permissions
**程序集:**mscorlib（在 mscorlib.dll 中）

语法

声明
Public Function GetPathList ( _
    access As FileIOPermissionAccess _
) As String()
用法
Dim instance As FileIOPermission
Dim access As FileIOPermissionAccess
Dim returnValue As String()

returnValue = instance.GetPathList(access)

public string[] GetPathList (
    FileIOPermissionAccess access
)

public:
array<String^>^ GetPathList (
    FileIOPermissionAccess access
)

public String[] GetPathList (
    FileIOPermissionAccess access
)

public function GetPathList (
    access : FileIOPermissionAccess
) : String[]

参数

返回值

一个包含文件和目录的路径的数组，用户被授予对这些文件和目录 access 参数所指定的访问权限。

异常

异常类型 条件

ArgumentException

access 不是有效的 FileIOPermissionAccess 值。

- 或 -

access 为 AllAccess（它表示多种类型的文件访问）或 NoAccess（它不表示任何类型的文件访问）。

备注

使用此方法获取当前权限的状态。若要同时获取 Read 和 Write 访问的状态，需要对此方法进行两次调用。

提示

access 参数限制为 FileIOPermissionAccess 的值，它表示单一类型的文件访问。这些值为 Read、Write、Append 和 PathDiscovery。access 可接受的值不包括 NoAccess 和 AllAccess，它们不表示单一类型的文件访问。

示例

Private Function SetGetPathListDemo() As Boolean
    Try
        Console.WriteLine("********************************************************" & ControlChars.Lf)

        Dim fileIOPerm1 As FileIOPermission
        Console.WriteLine("Creating a FileIOPermission with AllAccess rights for 'C:\Examples\Test\TestFile.txt")
        fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\Examples\Test\TestFile.txt")
        Console.WriteLine("Adding 'C:\Temp' to the write access list, and " & ControlChars.Lf & " 'C:\Examples\Test' to read access.")
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\Temp")
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\Examples\Test")
        Dim paths As String() = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
        Console.WriteLine("Read access before SetPathList = ")
        Dim path As String
        For Each path In paths
            Console.WriteLine((ControlChars.Tab & path))
        Next path
        Console.WriteLine("Setting the read access list to " & ControlChars.Lf & "'C:\Temp'")
        fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\Temp")
        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
        Console.WriteLine("Read access list after SetPathList = ")
        For Each path In paths
            Console.WriteLine((ControlChars.Tab & path))
        Next path

        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write)
        Console.WriteLine("Write access list after SetPathList = ")
        For Each path In paths
            Console.WriteLine((ControlChars.Tab & path))
        Next path

        Dim pathList() As String
        pathList = fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)

    Catch e As ArgumentException
        ' FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
        Console.WriteLine(("An ArgumentException occurred as a result of using AllAccess. " & "This property cannot be used as a parameter in GetPathList " & "because it represents more than one type of file variable access. : " & ControlChars.Lf & e.ToString()))
    End Try

    Return True
End Function 'SetGetPathListDemo

private bool SetGetPathListDemo()
{
    try
    {
        Console.WriteLine("********************************************************\n");

        FileIOPermission fileIOPerm1;
        Console.WriteLine("Creating a FileIOPermission with AllAccess rights for 'C:\\Examples\\Test\\TestFile.txt");
        fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\\Examples\\Test\\TestFile.txt");
        Console.WriteLine("Adding 'C:\\Temp' to the write access list, and \n 'C:\\Examples\\Test' to read access.");
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\\Examples\\Test");
        string[] paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
        Console.WriteLine("Read access before SetPathList = ");
        foreach (string path in paths)
        {
            Console.WriteLine("\t" + path);
        }
        Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
        fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
        Console.WriteLine("Read access list after SetPathList = ");
        foreach (string path in paths)
        {
            Console.WriteLine("\t" + path);
        }

        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
        Console.WriteLine("Write access list after SetPathList = ");
        foreach (string path in paths)
        {
            Console.WriteLine("\t" + path);
        }

        Console.WriteLine("Write access = \n" +
            fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess));

    }
    catch (ArgumentException e)
    {
        // FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
        Console.WriteLine("An ArgumentException occurred as a result of using AllAccess. "
            + "This property cannot be used as a parameter in GetPathList "
            + "because it represents more than one type of file variable access. : \n" + e);
    }

    return true;
}

bool SetGetPathListDemo()
{
   try
   {
      Console::WriteLine( "********************************************************\n" );
      FileIOPermission^ fileIOPerm1;
      Console::WriteLine( "Creating a FileIOPermission with AllAccess rights for 'C:\\Examples\\Test\\TestFile.txt" );
      
      fileIOPerm1 = gcnew FileIOPermission( FileIOPermissionAccess::AllAccess,"C:\\Examples\\Test\\TestFile.txt" );
      
      Console::WriteLine( "Adding 'C:\\Temp' to the write access list, and \n 'C:\\Examples\\Test' to read access." );
      fileIOPerm1->AddPathList( FileIOPermissionAccess::Write, "C:\\Temp" );
      fileIOPerm1->AddPathList( FileIOPermissionAccess::Read, "C:\\Examples\\Test" );
      array<String^>^paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
      Console::WriteLine( "Read access before SetPathList = " );
      IEnumerator^ myEnum = paths->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         String^ path = safe_cast<String^>(myEnum->Current);
         Console::WriteLine( "\t{0}", path );
      }

      Console::WriteLine( "Setting the read access list to \n'C:\\Temp'" );
      fileIOPerm1->SetPathList( FileIOPermissionAccess::Read, "C:\\Temp" );
      paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
      Console::WriteLine( "Read access list after SetPathList = " );
      IEnumerator^ myEnum1 = paths->GetEnumerator();
      while ( myEnum1->MoveNext() )
      {
         String^ path = safe_cast<String^>(myEnum1->Current);
         Console::WriteLine( "\t{0}", path );
      }

      paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Write );
      Console::WriteLine( "Write access list after SetPathList = " );
      IEnumerator^ myEnum2 = paths->GetEnumerator();
      while ( myEnum2->MoveNext() )
      {
         String^ path = safe_cast<String^>(myEnum2->Current);
         Console::WriteLine( "\t{0}", path );
      }

      Console::WriteLine( "Write access = \n{0}", fileIOPerm1->GetPathList( FileIOPermissionAccess::AllAccess ) );
   }
   catch ( ArgumentException^ e ) 
   {
      
      // FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
      Console::WriteLine( "An ArgumentException occurred as a result of using AllAccess. This property cannot be used as a parameter in GetPathList because it represents more than one type of file variable access. : \n{0}", e );
   }

   return true;
}


// AllAccess
// AddPathList adds access for the specified files and directories to the 
// existing state of the permission.
// SetPathList sets the specified access to the specified files and 
// directories, replacing the existing state of the permission.
// GetPathList gets all files and directories that have the specified 
// FileIOPermissionAccess.
private boolean SetGetPathListDemo() 
{
    try {
        Console.WriteLine("****************************" 
            + "****************************\n");
        FileIOPermission fileIOPerm1;
        
        Console.WriteLine("Creating a FileIOPermission with AllAccess " 
            + "rights for 'C:\\Examples\\Test\\TestFile.txt");
        fileIOPerm1 = new FileIOPermission(
            FileIOPermissionAccess.AllAccess, 
            "C:\\Examples\\Test\\TestFile.txt");

        Console.WriteLine("Adding 'C:\\Temp' to the write access " 
            + "list, and \n " +    "'C:\\Examples\\Test' to read access.");
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, 
            "C:\\Examples\\Test");
        String paths[] = fileIOPerm1.GetPathList(
            FileIOPermissionAccess.Read);
        Console.WriteLine("Read access before SetPathList = ");
        for (int iCtr = 0; iCtr < paths.length; iCtr++) {
            String path = paths[iCtr];
            Console.WriteLine(("\t" + path));
        }

        Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
        fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
        Console.WriteLine("Read access list after SetPathList = ");
        for (int iCtr = 0; iCtr < paths.length; iCtr++) {
            String path = paths[iCtr];
            Console.WriteLine(("\t" + path));
        }            
        
        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
        Console.WriteLine("Write access list after SetPathList = ");
        for (int iCtr = 0; iCtr < paths.length; iCtr++) {
            String path = paths[iCtr];
            Console.WriteLine(("\t" + path));
        }            
        Console.WriteLine(("Write access = \n" 
            + fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)));
    }
    catch(ArgumentException e){
        // FileIOPermissionAccess.AllAccess can not be used as a 
        // parameter for GetPathList.
        Console.WriteLine(("An ArgumentException occurred as a result " 
            + "of using AllAccess. " + "This property cannot be used as a " 
            + "parameter in GetPathList " 
            + "because it represents more than one type of " 
            + "file variable access. : \n" + e));
    }
    return true ;
} //SetGetPathListDemo

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

FileIOPermission 类
FileIOPermission 成员
System.Security.Permissions 命名空间