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。