存储墨迹
更新：2007 年 11 月
Save 方法支持将墨迹存储为墨迹序列化格式 (ISF)。 StrokeCollection 类的构造函数支持读取墨迹数据。
墨迹存储和检索
本节讨论如何在 WPF 平台中存储和检索墨迹。
下面的示例实现按钮单击事件处理程序，该处理程序向用户呈现一个“保存文件”对话框，并将 InkCanvas 中的墨迹保存为文件。
Private Sub buttonSaveAsClick(ByVal sender As Object, ByVal e As RoutedEventArgs)
Dim saveFileDialog1 As New SaveFileDialog()
saveFileDialog1.Filter = "isf files (*.isf)|*.isf"
If saveFileDialog1.ShowDialog() Then
Dim fs As New FileStream(saveFileDialog1.FileName, FileMode.Create)
theInkCanvas.Strokes.Save(fs)
fs.Close()
End If
End Sub 'buttonSaveAsClick
private void buttonSaveAsClick(object sender, RoutedEventArgs e)
{
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Filter = "isf files (*.isf)|*.isf";
if (saveFileDialog1.ShowDialog() == true)
{
FileStream fs = new FileStream(saveFileDialog1.FileName,
FileMode.Create);
theInkCanvas.Strokes.Save(fs);
fs.Close();
}
}
下面的示例实现按钮单击事件处理程序，该处理程序向用户呈现一个“打开文件”对话框，并将文件中的墨迹读取到 InkCanvas 元素中。
Private Sub buttonLoadClick(ByVal sender As Object, ByVal e As RoutedEventArgs)
Dim openFileDialog1 As New OpenFileDialog()
openFileDialog1.Filter = "isf files (*.isf)|*.isf"
If openFileDialog1.ShowDialog() Then
Dim fs As New FileStream(openFileDialog1.FileName, FileMode.Open)
theInkCanvas.Strokes = New StrokeCollection(fs)
fs.Close()
End If
End Sub 'buttonLoadClick
private void buttonLoadClick(object sender, RoutedEventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "isf files (*.isf)|*.isf";
if (openFileDialog1.ShowDialog() == true)
{
FileStream fs = new FileStream(openFileDialog1.FileName,
FileMode.Open);
theInkCanvas.Strokes = new StrokeCollection(fs);
fs.Close();
}
}