OpenFileDialog.ShowReadOnly Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

OpenFileDialog.cs

Mendapatkan atau mengatur nilai yang menunjukkan apakah kotak dialog berisi kotak centang baca-saja.

public:
 property bool ShowReadOnly { bool get(); void set(bool value); };

public bool ShowReadOnly { get; set; }

member this.ShowReadOnly : bool with get, set

Public Property ShowReadOnly As Boolean

Nilai Properti

Boolean

true jika kotak dialog berisi kotak centang baca-saja; jika tidak, false. Nilai defaultnya adalah false.

Contoh

Contoh kode berikut menunjukkan penggunaan ShowReadOnly properti. Contoh ini menampilkan kotak OpenFileDialog dengan properti diatur ShowReadOnly ke true. Jika pengguna mengklik opsi untuk membuka file dalam mode baca-saja, OpenFile metode ini digunakan untuk membuka file. Jika tidak, FileStream kelas digunakan untuk membuka file dalam mode baca/tulis.

private:
   FileStream^ OpenFile()
   {
      // Displays an OpenFileDialog and shows the read/only files.
      OpenFileDialog^ dlgOpenFile = gcnew OpenFileDialog;
      dlgOpenFile->ShowReadOnly = true;
      if ( dlgOpenFile->ShowDialog() == ::DialogResult::OK )
      {
         // If ReadOnlyChecked is true, uses the OpenFile method to
         // open the file with read/only access.
         if ( dlgOpenFile->ReadOnlyChecked )
         {
            return dynamic_cast<FileStream^>(dlgOpenFile->OpenFile());
         }
         // Otherwise, opens the file with read/write access.
         else
         {
            String^ path = dlgOpenFile->FileName;
            return gcnew FileStream( path,System::IO::FileMode::Open,System::IO::FileAccess::ReadWrite );
         }
      }

      return nullptr;
   }

private FileStream OpenFile()
{
    // Displays an OpenFileDialog and shows the read/only files.

    OpenFileDialog dlgOpenFile = new OpenFileDialog();
    dlgOpenFile.ShowReadOnly = true;

    if(dlgOpenFile.ShowDialog() == DialogResult.OK)
    {

        // If ReadOnlyChecked is true, uses the OpenFile method to
        // open the file with read/only access.
        string path = null;

        try {
            if (dlgOpenFile.ReadOnlyChecked)
            {
                return (FileStream)dlgOpenFile.OpenFile();
            }

            // Otherwise, opens the file with read/write access.
            else
            {
                path = dlgOpenFile.FileName;
                return new FileStream(path, System.IO.FileMode.Open,
                            System.IO.FileAccess.ReadWrite);
            }
        } catch (SecurityException ex)
            {
                // The user lacks appropriate permissions to read files, discover paths, etc.
                MessageBox.Show("Security error. Please contact your administrator for details.\n\n" +
                    "Error message: " + ex.Message + "\n\n" +
                    "Details (send to Support):\n\n" + ex.StackTrace
                );
            }
            catch (Exception ex)
            {
                // Could not load the image - probably related to Windows file system permissions.
                MessageBox.Show("Cannot display the image: " + path.Substring(path.LastIndexOf('\\'))
                    + ". You may not have permission to read the file, or " +
                    "it may be corrupt.\n\nReported error: " + ex.Message);
            }
    }

    return null;
}

Private Function OpenFile() As FileStream

    ' Displays an OpenFileDialog and shows the read/only files.

    Dim DlgOpenFile As New OpenFileDialog()
    DlgOpenFile.ShowReadOnly = True

    If DlgOpenFile.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
        Dim path As New String("")

        ' If ReadOnlyChecked is true, uses the OpenFile method to
        ' open the file with read/only access.
        Try
            If (DlgOpenFile.ReadOnlyChecked = True) Then
                Return DlgOpenFile.OpenFile()
            Else
                ' Otherwise, opens the file with read/write access.
                Path = DlgOpenFile.FileName
                Return New FileStream(Path, System.IO.FileMode.Open, _
                        System.IO.FileAccess.ReadWrite)
            End If
        Catch SecEx As SecurityException
            ' The user lacks appropriate permissions to read files, discover paths, etc.
            MessageBox.Show("Security error. Please contact your administrator for details.\n\n" & _
                "Error message: " & SecEx.Message * "\n\n" & _
                "Details (send to Support):\n\n" & SecEx.StackTrace)
        Catch Ex As Exception
            ' Could not load the image - probably related to Windows file system permissions.
            MessageBox.Show("Cannot display the image: " & path.Substring(path.LastIndexOf("\\")) & _
                     ". You may not have permission to read the file, or " & _
                    "it may be corrupt.\n\nReported error: " + ex.Message)
        End Try
    End If

    Return Nothing
End Function

Lihat juga

• ReadOnlyChecked