OpenFileDialog.ShowReadOnly Property
.NET Framework (current version)
Gets or sets a value indicating whether the dialog box contains a read-only check box.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Property Value
Type: System.Booleantrue if the dialog box contains a read-only check box; otherwise, false. The default value is false.
The following code example demonstrates the use of the ShowReadOnly 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 OpenFile method is used to open the file. Otherwise, the FileStream class is used to open the file in read/write mode.
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
.NET Framework
Available since 1.1
Available since 1.1
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