OpenFileDialog.ReadOnlyChecked Vlastnost

Definice

Obor názvů:

System.Windows.Forms

Sestavení:

System.Windows.Forms.dll

Zdroj:

OpenFileDialog.cs

Získá nebo nastaví hodnotu určující, zda je zaškrtnuto políčko jen pro čtení.

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

public bool ReadOnlyChecked { get; set; }

member this.ReadOnlyChecked : bool with get, set

Public Property ReadOnlyChecked As Boolean

Hodnota vlastnosti

Boolean

trueje-li zaškrtnuto políčko jen pro čtení; v opačném případě . false Výchozí hodnota je false.

Příklady

Následující příklad kódu ukazuje použití ReadOnlyChecked vlastnosti. Tento příklad zobrazí OpenFileDialog pole s vlastností nastavenou ShowReadOnly na true. Pokud uživatel klikne na možnost otevřít soubor v režimu jen pro čtení, ReadOnlyChecked vlastnost se vyhodnotí jako truea OpenFile metoda se použije k otevření souboru. V opačném případě se FileStream třída používá k otevření souboru v režimu čtení a zápisu.

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

Poznámky

Stav ReadOnlyChecked nemá vliv na režim čtení a zápisu, který OpenFileDialog.OpenFile používá k otevření souboru vybraného v dialogovém okně. OpenFile soubor se vždy otevře v režimu jen pro čtení.

Vlastnost ShowReadOnly musí být nastavena dříve, aby se v dialogovém okně zobrazilo zaškrtávací políčko jen pro čtení.

Viz také

• ShowReadOnly