c#操作PowerPoint添加chart

Question

最近在做一个用c#直接操作ppt的程序，通过c#处理数据后直接生成一个ppt。但是在添加图表的时候只能将图表本身加进去，数据需要人工输入图表对应的excel图表才能正确显示数据，不知道怎么才能直接就将数据加入到图表对应的excel中，这样就不在需要人工输入了

下面是添加图标的代码：
private void chartButton_Click(object sender, EventArgs e)
{
string path = pptPathTextBox.Text;
OpenPPT(path);

        //Add a new slide
        int count = presentation.Slides.Count;
        presentation.Slides.Add(count + 1, PPT.PpSlideLayout.ppLayoutBlank);

        //Add a pie chart
        slide = presentation.Slides[count + 1];
        Graph.Chart aChart = (Graph.Chart)slide.Shapes.AddOLEObject(150, 150, 480, 320,"MSGraph.Chart.8", "", MsoTriState.msoFalse, "", 0, "",MsoTriState.msoFalse).OLEFormat.Object;
        aChart.ChartType = Graph.XlChartType.xl3DPie;
        aChart.Legend.Position = Graph.XlLegendPosition.xlLegendPositionBottom;
        aChart.HasTitle = true;
        aChart.ChartTitle.Text = "It is a pie chart";
    }