OpenFileDialog.ReadOnlyChecked Property
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets or sets a value indicating whether the read-only check box is selected.
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
true
if the read-only check box is selected; otherwise, false
. The default value is false
.
The following code example demonstrates the use of the ReadOnlyChecked property. This example displays the OpenFileDialog box with the ShowReadOnly property set to true
. If the user clicks the option to open the file in read-only mode, the ReadOnlyChecked property evaluates to true
, and the OpenFile method is used to open the file. Otherwise, the FileStream class is used to open the file in read/write mode.
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
The ReadOnlyChecked state does not affect the read/write mode that OpenFileDialog.OpenFile uses to open a file selected in the dialog box. OpenFile will always open the file in read-only mode.
The ShowReadOnly property must be set before in order for the read-only check box to appear in the dialog box.
Termék | Verziók |
---|---|
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
.NET-visszajelzés
A(z) .NET egy nyílt forráskód projekt. Visszajelzés adásához válasszon egy hivatkozást: