HighChart图片本地导出

Highchart第三方图表控件，导出默认是从官方地址导出，这样在无外网的条件下则导致导出失败，改进如下：

后台导出代码：

public partial class HighChart : 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();
            }
        }
    }
}

　　exporting.src.js文件中，导出服务地址改为 url: 'HighChart.aspx'即可。