Hi,

I am not sure if this approach is going to work for you or not, but I wanted to share this information that you can also add the Excel chart as an image over slide object. Please have a look over the code snippet shared below in which first the chart in "simplechart.xls" file is accessed into Bitmap object and then I have simply placed it inside the shapes collection of slide using AddPictureFrame (...) method.

C# .NET

Workbook  wb = new Workbook();
//Obatianing the filestream of the excel file containing the chart/charts in it
FileStream fstro = new FileStream("c:\\simplechart.xls", FileMode.Open, FileAccess.Read);
//Laoading the file stream of referenced excel file in workbook
wb.Open(fstro);

//Loading the chart in Bitmap. We've chart at worksheet3
Bitmap imgChart = wb.Worksheets[2].Charts[0].ToImage();
// create a presentation object
Presentation pres = new Presentation();
Slide slide = pres.GetSlideByPosition(1);
// Adding the Bitmap in the picture frame
Aspose.Slides.Picture pic = new Aspose.Slides.Picture(pres, imgChart);
//Adding the picture object to pictures collection of the presentation
//After the picture object is added, the picture is given a uniqe picture Id
int picId = pres.Pictures.Add(pic);
//Calculating picture width and height
int pictureWidth = pres.Pictures[picId - 1].Image.Width * 4;
int pictureHeight = pres.Pictures[picId - 1].Image.Height * 4;
//Calculating slide width and height
int slideWidth = slide.Background.Width;
int slideHeight = slide.Background.Height;
//Calculating the width and height of picture frame
int pictureFrameWidth = Convert.ToInt32(slideWidth / 2 - pictureWidth / 2);
int pictureFrameHeight = Convert.ToInt32(slideHeight / 2 - pictureHeight / 2);

//Adding picture frame to the slide
slide.Shapes.AddPictureFrame(picId, pictureFrameWidth, pictureFrameHeight,
pictureWidth, pictureHeight);
//Saving the ppt file
pres.Write("c:\\ImageSlide.ppt");

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Mudassir Fayyaz
Support Developer
Aspose Sialkot Team
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