Live Razor Page Samples

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;

namespace Website.Pages.Support.Samples.RazorPages.Imaging
{
    public partial class SimpleChartImageModel : PageModel
    {
        public FileResult OnGet()
        {
            // Create a new workbook and reference to Sheet1.
            SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbook();
            SpreadsheetGear.IWorksheet worksheet = workbook.Worksheets["Sheet1"];

            // Load some sample data.
            SpreadsheetGear.IRange dataRange = worksheet.Cells["A1:E5"];
            dataRange.Value = new string[,] {
            { "", "North", "South", "East", "West" },
            { "Q1", "$7,923", "$5,954", "$5,522", "$3,701" },
            { "Q2", "$7,681", "$8,665", "$5,836", "$4,851" },
            { "Q3", "$4,739", "$2,107", "$3,298", "$1,211" },
            { "Q4", "$6,459", "$7,385", "$7,125", "$7,070" }, };

            // Add a chart to the worksheet's shape collection.
            // NOTE: Calculate coordinates in points (72 points per inch)
            SpreadsheetGear.Shapes.IShape shape =
                worksheet.Shapes.AddChart(0, 0, 4 * 72, 3 * 72);
            SpreadsheetGear.Charts.IChart chart = shape.Chart;

            // Set the chart's source data range, plotting series in columns.
            chart.SetSourceData(dataRange, SpreadsheetGear.Charts.RowCol.Columns);

            // Set the chart type.
            chart.ChartType = SpreadsheetGear.Charts.ChartType.BarStacked;

            // Set the distance between bars as a percentage of the bar width.
            chart.ChartGroups[0].GapWidth = 50;

            // Add a chart title and change the font size.
            chart.HasTitle = true;
            chart.ChartTitle.Text = "Combined Sales by Quarter";
            chart.ChartTitle.Font.Size = 12;

            // Create the image class from the chart shape.
            SpreadsheetGear.Drawing.Image image = new SpreadsheetGear.Drawing.Image(shape);

            // Get a new bitmap image of the represented chart.
            using (System.Drawing.Bitmap bitmap = image.GetBitmap())
            {
                // Stream the chart image to the client in PNG format.
                System.IO.MemoryStream imageStream = new System.IO.MemoryStream();
                bitmap.Save(imageStream, System.Drawing.Imaging.ImageFormat.Png);

                // Reset position to the beginning of the stream.
                imageStream.Seek(0, System.IO.SeekOrigin.Begin);

                // Stream the image to the client.
                return File(imageStream, "image/png");
            }
        }
    }
}