1、开启一个线程

Task.Run(() => { CreatPrintImage(preViewModel.DiyProductGuid); });

2、线程代码

    /// <summary>  
    /// 生成打印图片 (这里一定要异步，开另外一个线程调用，不用接受返回)  
    /// </summary>  
    /// <param name="diyGuid"></param>  
    /// <returns></returns>  
    public void CreatPrintImage(string  diyGuid)  
    {  
        lock (obj)  
        {  
            using (var lifeTime = EngineContext.Current.ContainerManager.Container.BeginLifetimeScope())  
            {  
                var productService = lifeTime.Resolve<IProductService>();  
                var pictureService = lifeTime.Resolve<IPictureService>();  
                var downloadService = lifeTime.Resolve<IDownloadService>();  
                var product = productService.GetProdcutByDiyGuid(diyGuid);  
                //var product = \_productService.GetProductById(productId);  
                var diyItem = product.DiyItem;  
                var diyItemTemplate = diyItem.DiyItemTemplates.FirstOrDefault();  
                foreach (var pp in product.ProductPictures)  
                {  
                    #region 合成打印图片  
                    double bitmapWidth = 0;  
                    double bitmapHeight = 0;  
                    if (diyItemTemplate != null)  
                    {  
                        //如果是盒子  
                        if (diyItem.DiyType.IdentNumber == "10005")  
                        {  
                            switch (pp.DiyItemTemplateName)  
                            {  
                                case "上":  
                                    bitmapWidth = diyItemTemplate.EditWidth;  
                                    bitmapHeight = diyItemTemplate.EditHeight;  
                                    break;  
                                case "下":  
                                    bitmapWidth = diyItemTemplate.EditWidth;  
                                    bitmapHeight = diyItemTemplate.EditHeight;  
                                    break;  
                                case "左":  
                                    bitmapWidth = diyItemTemplate.EditHeight;  
                                    bitmapHeight = diyItemTemplate.EditLong ?? 0;  
                                    break;  
                                case "右":  
                                    bitmapWidth = diyItemTemplate.EditHeight;  
                                    bitmapHeight = diyItemTemplate.EditLong ?? 0;  
                                    break;  
                                case "中":  
                                    bitmapWidth = diyItemTemplate.EditWidth;  
                                    bitmapHeight = diyItemTemplate.EditLong ?? 0;  
                                    break;  
                            }  
                        }  
                        else  
                        {  
                            bitmapWidth = diyItemTemplate.EditWidth;  
                            bitmapHeight = diyItemTemplate.EditHeight;  
                        }  
                        var bitmap = new Bitmap((int)bitmapWidth, (int)bitmapHeight);  
                        var huabug = Graphics.FromImage(bitmap);  
                        foreach (var sideItem in pp.DiyInfoSideItems.OrderBy(s => s.DisplayOrder))  
                        {  
                            var printDiyInfo = new PrintDiyInfo();  
                            printDiyInfo.RotationAngle = sideItem.DiyInfoRotate;  
                            printDiyInfo.CenterMarginLeft = sideItem.CenterMarginLeft ?? 0;  
                            printDiyInfo.CenterMarginTop = sideItem.CenterMarginTop ?? 0;  
                            printDiyInfo.TemplateZoom = pp.ShowScaling ?? 0;  
                            printDiyInfo.EditWidth = 0;  
                            printDiyInfo.EditHeight = 0;  
                            //如果是盒子  
                            if (diyItem.DiyType.IdentNumber == "10005")  
                            {  
                                switch (pp.DiyItemTemplateName)  
                                {  
                                    case "上":  
                                        printDiyInfo.RotationAngle = 180;  
                                        break;  
                                    case "下":  
                                        printDiyInfo.RotationAngle = 0;  
                                        break;  
                                    case "左":  
                                        printDiyInfo.RotationAngle = 90;  
                                        break;  
                                    case "右":  
                                        printDiyInfo.RotationAngle = 270;  
                                        break;  
                                }  
                            }  
                            //如果是图片或者是贴纸  
                            if (sideItem.DiyInfoType == DiyInfoTypeEnum.Picture ||  
                                sideItem.DiyInfoType == DiyInfoTypeEnum.Paster)  
                            {  
                                string originalPictureUrl = sideItem.DiyInfoType == DiyInfoTypeEnum.Picture ? pictureService.GetPictureUrl(sideItem.PictureId ?? 0) : pictureService.GetPictureUrl(sideItem.PasterId ?? 0);  
                                var mapPath = \_webHelper.MapPath(originalPictureUrl.Substring(originalPictureUrl.IndexOf("/Content", StringComparison.Ordinal)));  
                                var bit = new Bitmap(mapPath);  
                                //缩放  
                                var bm1 = new Bitmap(bit, Convert.ToInt32(bit.Width \* printDiyInfo.TemplateZoom \* sideItem.DiyInfoZoom), Convert.ToInt32(bit.Height \* printDiyInfo.TemplateZoom \* sideItem.DiyInfoZoom));  
                                var ms = new MemoryStream();  
                                bm1.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);  
                                byte\[\] bytes = ms.GetBuffer();  
                                //旋转  
                                var imageFactory = new ImageFactory();  
                                imageFactory.Load(bytes);  
                                imageFactory.Rotate((float)printDiyInfo.RotationAngle);  
                                var rotationImage = imageFactory.Image;  
                                if (rotationImage != null)  
                                {  
                                    var pointx = Convert.ToInt32(printDiyInfo.CenterMarginLeft \* printDiyInfo.TemplateZoom - rotationImage.Width / 2);  
                                    var pointy = Convert.ToInt32(printDiyInfo.CenterMarginTop \* printDiyInfo.TemplateZoom - rotationImage.Height / 2);  
                                    var ulCorner = new Point(pointx, pointy);  
                                    huabug.DrawImage(rotationImage, ulCorner);  
                                }  
                            }  
                            else if (sideItem.DiyInfoType == DiyInfoTypeEnum.Font)  
                            {  
                                var sidefont = downloadService.GetDownloadById(sideItem.FontId ?? 0);  
                                if (sidefont != null)  
                                {  
                                    var fontUrl = \_webHelper.MapPath(sidefont.DownloadUrl);  
                                    var frm = new PrivateFontCollection();  
                                    frm.AddFontFile(fontUrl);  
                                    var fontFamily = frm.Families\[0\];  
                                    var fontSize = 51 \* (float)sideItem.DiyInfoZoom;  
                                    var fontColor = ColorTranslator.FromHtml(sideItem.FontColor);  
                                    var fontStyle = new FontStyle();  
                                    if ((sideItem.FontIsBold ?? false) && (sideItem.FontIsItalic ?? false))  
                                    {  
                                        fontStyle = FontStyle.Bold | FontStyle.Italic;  
                                    }  
                                    else if ((sideItem.FontIsBold ?? false))  
                                    {  
                                        fontStyle = FontStyle.Bold;  
                                    }  
                                    else if (sideItem.FontIsItalic ?? false)  
                                    {  
                                        fontStyle = FontStyle.Italic;  
                                    }  
                                    var font = new Font(fontFamily, fontSize, fontStyle);  
                                    //定义颜色  
                                    var sbrush = new SolidBrush(fontColor);  
                                    // 绘制围绕点旋转的文本  
                                    var pointx = Convert.ToInt32(printDiyInfo.CenterMarginLeft \* printDiyInfo.TemplateZoom);  
                                    var pointy = Convert.ToInt32(printDiyInfo.CenterMarginTop \* printDiyInfo.TemplateZoom);  
                                    var point = new PointF(pointx, pointy);  
                                    //var point = new PointF(200, 200);  
                                    StringFormat format = new StringFormat();  
                                    format.Alignment = StringAlignment.Center;  
                                    format.LineAlignment = StringAlignment.Center;  
                                    Matrix mtxRotate = huabug.Transform;  
                                    mtxRotate.RotateAt((float)printDiyInfo.RotationAngle, point); // 旋转角度和平移  
                                    huabug.Transform = mtxRotate;  
                                    huabug.DrawString(sideItem.FontString, font, sbrush, point, format);  
                                }  
                            }  
                        }  
                        string printMapPath = \_webHelper.MapPath(\_filePath);  
                        if (!System.IO.Directory.Exists(printMapPath))  
                        {  
                            System.IO.Directory.CreateDirectory(printMapPath);  
                        }  
                        var printFileName = pp.DiyItemTemplateName + "diy\_" + Guid.NewGuid().ToString().ToLower().Replace("-", "") + ".png";  
                        var printPicUrl = "/Content/Uploads/Images/PrintImage/" + DateTime.Now.ToString("yyyyMM") + "/" + printFileName;  
                        bitmap.Save(\_webHelper.MapPath(printPicUrl));  
                        pp.PrintImageUrl = printPicUrl;  
                        #endregion  
                        //productPictureService.UpdateProductPicture(pp);  
                    }  
                }  
                productService.UpdateProduct(product);  
            }  
        }  
    }