OpenFileDialog.ReadOnlyChecked 属性
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
获取或设置一个值,该值指示是否选定只读复选框。
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
属性值
如果选中了只读复选框,则为 true
;反之,则为 false
。 默认值是 false
。
示例
下面的代码示例演示如何使用 ReadOnlyChecked 属性。 此示例显示 OpenFileDialog 属性设置为 true
的ShowReadOnly框。 如果用户单击选项以只读模式打开文件,则 ReadOnlyChecked 属性的计算结果为 true
,并使用 OpenFile 方法打开文件。 否则, FileStream 类用于在读/写模式下打开文件。
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
注解
状态 ReadOnlyChecked 不会影响使用 打开对话框中所选文件的读/写模式 OpenFileDialog.OpenFile 。 OpenFile 将始终以只读模式打开文件。
ShowReadOnly必须先设置 属性,才能在对话框中显示只读复选框。