WPF DataGrid ContextMenu CommandParameter Relative x:Type ContextMenu ,Path=PlacementTarget

FredGrit發表於2024-09-16
//xaml
<DataGrid.ContextMenu>
    <ContextMenu>
        <MenuItem Header="Serialize Binary" 
                  Command="{Binding BinSerializeCmd}"
                  CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ContextMenu}},Path=PlacementTarget}"/>
    </ContextMenu>
</DataGrid.ContextMenu>

// cs

private void BinSerializeCmdExecuted(object obj) { var dg = obj as DataGrid; if(dg!=null) { SaveFileDialog dialog = new SaveFileDialog(); dialog.Filter = "All Files|*.*|Bin Files|*.bin"; dialog.FileName = $"{DateTime.Now.ToString("yyyyMMddHHmmssffff")}_{Guid.NewGuid().ToString("N")}.bin"; if(dialog.ShowDialog()==true) { using(System.IO.FileStream fs=new System.IO.FileStream(dialog.FileName,System.IO.FileMode.OpenOrCreate,FileAccess.ReadWrite)) { BinaryFormatter binFormatter = new BinaryFormatter(); binFormatter.Serialize(fs,dg.Items.Cast<Book>().ToList()); MessageBox.Show($"Saved in {dialog.FileName}", "Binary Formatter Serialize", MessageBoxButton.OK); } } } }

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