Highcharts export image. Net C #

Highcharts provides the image export function, but it needs to connect to its server for export.

Public Network is required, and the speed of foreign servers is quite slow.

Therefore, I found a class to export highcharts images by myself and put it out.

using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.IO;using Svg;using System.Drawing.Imaging;using iTextSharp.text;using iTextSharp.text.pdf;using System.Text;namespace ExportServer{    public partial class _Default : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            if (!Page.IsPostBack)            {                if (Request.Form["type"] != null && Request.Form["svg"] != null && Request.Form["filename"] != null)                {                    string tType = Request.Form["type"].ToString();                    string tSvg = Request.Form["svg"].ToString();                    string tFileName = Request.Form["filename"].ToString();                    if (tFileName == "")                    {                        tFileName = "chart";                    }                    MemoryStream tData = new MemoryStream(Encoding.UTF8.GetBytes(tSvg));                    MemoryStream tStream = new MemoryStream();                    string tTmp = new Random().Next().ToString();                    string tExt = "";                    string tTypeString = "";                    switch (tType)                    {                        case "image/png":                            tTypeString = "-m image/png";                            tExt = "png";                            break;                        case "image/jpeg":                            tTypeString = "-m image/jpeg";                            tExt = "jpg";                            break;                        case "application/pdf":                            tTypeString = "-m application/pdf";                            tExt = "pdf";                            break;                        case "image/svg+xml":                            tTypeString = "-m image/svg+xml";                            tExt = "svg";                            break;                    }                    if (tTypeString != "")                    {                        string tWidth = Request.Form["width"].ToString();                        Svg.SvgDocument tSvgObj = SvgDocument.Open(tData);                        switch (tExt)                        {                            case "jpg":                                tSvgObj.Draw().Save(tStream, ImageFormat.Jpeg);                                break;                            case "png":                                tSvgObj.Draw().Save(tStream, ImageFormat.Png);                                break;                            case "pdf":                                PdfWriter tWriter = null;                                Document tDocumentPdf = null;                                try                                {                                    tSvgObj.Draw().Save(tStream, ImageFormat.Png);                                    tDocumentPdf = new Document(new Rectangle((float)tSvgObj.Width, (float)tSvgObj.Height));                                    tDocumentPdf.SetMargins(0.0f, 0.0f, 0.0f, 0.0f);                                    iTextSharp.text.Image tGraph = iTextSharp.text.Image.GetInstance(tStream.ToArray());                                    tGraph.ScaleToFit((float)tSvgObj.Width, (float)tSvgObj.Height);                                    tStream = new MemoryStream();                                    tWriter = PdfWriter.GetInstance(tDocumentPdf, tStream);                                    tDocumentPdf.Open();                                    tDocumentPdf.NewPage();                                    tDocumentPdf.Add(tGraph);                                    tDocumentPdf.CloseDocument();                                }                                catch (Exception ex)                                {                                    throw ex;                                }                                finally                                {                                    tDocumentPdf.Close();                                    tDocumentPdf.Dispose();                                    tWriter.Close();                                    tWriter.Dispose();                                    tData.Dispose();                                    tData.Close();                                }                                break;                            case "svg":                                tStream = tData;                                break;                        }                        Response.ClearContent();                        Response.ClearHeaders();                        Response.ContentType = tType;                        Response.AppendHeader("Content-Disposition", "attachment; filename=" + tFileName + "." + tExt + "");                        Response.BinaryWrite(tStream.ToArray());                        Response.End();                    }                }            }        }    }}

You need to reference SVG. DLL to find an open-source project connection.

Itextsharp. dll provides Chinese support