EnvironmentPermission.GetPathList(EnvironmentPermissionAccess) Metode

Definisi

Ruang nama:

System.Security.Permissions

Rakitan:

System.Security.Permissions.dll

Mendapatkan semua variabel lingkungan dengan yang ditentukan EnvironmentPermissionAccess.

public:
 System::String ^ GetPathList(System::Security::Permissions::EnvironmentPermissionAccess flag);

public string GetPathList (System.Security.Permissions.EnvironmentPermissionAccess flag);

member this.GetPathList : System.Security.Permissions.EnvironmentPermissionAccess -> string

Public Function GetPathList (flag As EnvironmentPermissionAccess) As String

Parameter

flag

EnvironmentPermissionAccess

Salah EnvironmentPermissionAccess satu nilai yang mewakili satu jenis akses variabel lingkungan.

Mengembalikan

String

Daftar variabel lingkungan (dipisahkan titik koma) untuk bendera yang dipilih.

Pengecualian

ArgumentException

flag bukan nilai yang valid dari EnvironmentPermissionAccess.

-atau-

flag adalah AllAccess, yang mewakili lebih dari satu jenis akses variabel lingkungan, atau NoAccess, yang tidak mewakili jenis akses variabel lingkungan apa pun.

Contoh

Contoh kode berikut menunjukkan penggunaan GetPathList metode . Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk EnvironmentPermission kelas .

private bool SetGetPathListDemo()
{
    try
    {
        Console.WriteLine("********************************************************\n");
        Console.WriteLine("Creating an EnvironmentPermission with AllAccess rights for 'TMP'");
        EnvironmentPermission envPerm1 = new EnvironmentPermission(EnvironmentPermissionAccess.AllAccess, "TMP");
        Console.WriteLine("Adding 'TEMP' to the write access list, and 'windir' to the read access list.");
        envPerm1.AddPathList(EnvironmentPermissionAccess.Write, "TEMP");
        envPerm1.AddPathList(EnvironmentPermissionAccess.Read, "windir");
        Console.WriteLine("Read access list before SetPathList = "
            + envPerm1.GetPathList(EnvironmentPermissionAccess.Read));
        Console.WriteLine("Setting read access to 'TMP'");
        envPerm1.SetPathList(EnvironmentPermissionAccess.Read, "TMP");
        Console.WriteLine("Read access list after SetPathList = "
            + envPerm1.GetPathList(EnvironmentPermissionAccess.Read));
        Console.WriteLine("Write access list = " + envPerm1.GetPathList(EnvironmentPermissionAccess.Write));
        Console.WriteLine("Write access environment variables = "
            + envPerm1.GetPathList(EnvironmentPermissionAccess.AllAccess));
    }
    catch (ArgumentException e)
    {
        // EnvironmentPermissionAccess.AllAccess cannot 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 environment variable : \n" + e);
    }

    return true;
}

Private Function SetGetPathListDemo() As Boolean 
    Try
        Console.WriteLine("********************************************************" + vbLf)
        Console.WriteLine("Creating an EnvironmentPermission with AllAccess rights for 'TMP'")
        Dim envPerm1 As New EnvironmentPermission(EnvironmentPermissionAccess.AllAccess, "TMP")
        Console.WriteLine("Adding 'TEMP' to the write access list, and 'windir' to the read access list.")
        envPerm1.AddPathList(EnvironmentPermissionAccess.Write, "TEMP")
        envPerm1.AddPathList(EnvironmentPermissionAccess.Read, "windir")
        Console.WriteLine("Read access list before SetPathList = " + envPerm1.GetPathList(EnvironmentPermissionAccess.Read))
        Console.WriteLine("Setting read access to 'TMP'")
        envPerm1.SetPathList(EnvironmentPermissionAccess.Read, "TMP")
        Console.WriteLine("Read access list after SetPathList = " + envPerm1.GetPathList(EnvironmentPermissionAccess.Read))
        Console.WriteLine("Write access list = " + envPerm1.GetPathList(EnvironmentPermissionAccess.Write))
        Console.WriteLine("Write access environment variables = " + envPerm1.GetPathList(EnvironmentPermissionAccess.AllAccess))
    Catch e As ArgumentException
        ' EnvironmentPermissionAccess.AllAccess cannot 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 environment variable : " + vbLf + e.Message)
    End Try
    
    Return True

End Function 'SetGetPathListDemo

Keterangan

Gunakan metode ini untuk mendapatkan status izin saat ini. Untuk mendapatkan status akses Read dan Write memerlukan dua panggilan ke metode ini.

Catatan

Parameter flag terbatas pada nilai EnvironmentPermissionAccess, yang mewakili satu jenis akses variabel lingkungan. Nilai-nilai tersebut adalah Read dan Write. Nilai yang dapat diterima untuk flag tidak menyertakan NoAccess dan AllAccess, yang tidak mewakili satu jenis akses variabel lingkungan.