OpenFileDialog.ReadOnlyChecked Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan atau mengatur nilai yang menunjukkan apakah kotak centang baca-saja dipilih.
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
Nilai Properti
true
jika kotak centang baca-saja dipilih; jika tidak, false
. Nilai defaultnya adalah false
.
Contoh
Contoh kode berikut menunjukkan penggunaan ReadOnlyChecked properti . Contoh ini menampilkan OpenFileDialog kotak dengan properti diatur ShowReadOnly ke true
. Jika pengguna mengklik opsi untuk membuka file dalam mode baca-saja, ReadOnlyChecked properti mengevaluasi ke true
, dan OpenFile metode 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 == true )
{
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 == true)
{
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
Keterangan
Status ReadOnlyChecked tidak mempengaruhi mode baca/tulis yang OpenFileDialog.OpenFile menggunakan untuk membuka file yang dipilih dalam kotak dialog. OpenFile akan selalu membuka file dalam mode baca-saja.
Properti ShowReadOnly harus diatur sebelumnya agar kotak centang baca-saja muncul dalam kotak dialog.