<MetroChart:ClusteredBarChart                     Name="PerformanceChart"                ChartTitle="员工绩效"                ChartSubTitle="流出流入绩效"                     FontSize="14"                SelectedItem="{Binding Path=SelectedItem, Mode=TwoWay}"                SeriesSource="{Binding Path=Series}"                IsRowColumnSwitched="True"                            >                <MetroChart:ClusteredBarChart.Resources>                    <ResourceDictionary Source="pack://application:,,,/De.TorstenMandelkow.MetroChart;component/Themes/Generic.xaml"/>                </MetroChart:ClusteredBarChart.Resources>                <MetroChart:ClusteredBarChart.SeriesTemplate>                    <DataTemplate>                        <MetroChart:ChartSeries                            SeriesTitle="{Binding Path=DisplayName}"                            DisplayMember="Performer"                            ValueMember="Score"                            ItemsSource="{Binding Path=Items}"                                                      />                    </DataTemplate>                </MetroChart:ClusteredBarChart.SeriesTemplate>            </MetroChart:ClusteredBarChart>

 Size size = new Size(this.Width, this.Height);            PerformanceChart.Measure(size);                        var rtb = new RenderTargetBitmap(               (int)PerformanceChart.ActualWidth, //width               (int)PerformanceChart.ActualHeight, //height               96, //dpi x               96, //dpi y               PixelFormats.Pbgra32 // pixelformat               );            rtb.Render(PerformanceChart);                     var bitmap = rtb;            byte[] data;            System.Windows.Media.Imaging.JpegBitmapEncoder encoder = new System.Windows.Media.Imaging.JpegBitmapEncoder();            encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(bitmap));            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())            {                encoder.Save(ms);                data = ms.ToArray();            }            NPOI.HSSF.UserModel.HSSFWorkbook workbook = new NPOI.HSSF.UserModel.HSSFWorkbook();            var sheet = workbook.CreateSheet();            var row = sheet.CreateRow(0);            var cell = row.CreateCell(0);            cell.SetCellValue("Hello world");            row = sheet.CreateRow(1);            cell = row.CreateCell(0);            int pictureIdx = workbook.AddPicture(data, NPOI.SS.UserModel.PictureType.PNG);            NPOI.HSSF.UserModel.HSSFPatriarch patriarch = (NPOI.HSSF.UserModel.HSSFPatriarch)sheet.CreateDrawingPatriarch();            var rowsNum = 1;            //add a picture              NPOI.HSSF.UserModel.HSSFClientAnchor anchor = new NPOI.HSSF.UserModel.HSSFClientAnchor(0, 10, 1023, 0, 0, rowsNum, 2, rowsNum);            NPOI.HSSF.UserModel.HSSFPicture pict = (NPOI.HSSF.UserModel.HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);            pict.Resize();            var dlg = new Microsoft.Win32.SaveFileDialog { Filter = ".xls files|*.xls", DefaultExt = ".xls" };            var path = dlg.ShowDialog(this).Value ? dlg.FileName : null;            if (path != null)            {                using (System.IO.FileStream fs = new System.IO.FileStream(dlg.FileName, System.IO.FileMode.OpenOrCreate))                {                    //将内容写入到硬盘中                     workbook.Write(fs);                }            }            System.Windows.MessageBox.Show("导出成功！");