ASP.NET 使用Aspose实现Office格式转换和在线预览

有关于.net 仿百度文库在线预览Word、Excel、PPT等office相关文件。这里我们使用Aspose相关组件，将office文件转化为Pdf格式文件存储或在线预览（Word可以存为Png格式，但是直接保存只会保存第一页）。

Aspose.Words.dll 操作Word

首先说转换为PDF格式存储和显示：

/// <summary>        /// 将Word转换为Pdf         /// </summary>        /// <param name="strFilePath">文件地址</param>        /// <param name="savepath">保存地址</param>        /// <returns></returns>        public bool Word2Pdf(string strFilePath,string savepath)        {            try            {                Aspose.Words.Document doc = new Aspose.Words.Document(strFilePath);                //将Word保存到指定路径下 savepath：保存路径                doc.Save(savepath, Aspose.Words.SaveFormat.Pdf);                //将Word保存至数据流中 再通过Response显示在页面中                MemoryStream memStream = new MemoryStream();                doc.Save(memStream, Aspose.Words.SaveFormat.Pdf);                byte[] bt = memStream.ToArray();                Response.ContentType = "application/pdf";                Response.OutputStream.Write(bt, 0, bt.Length);                return true;            }            catch (Exception)            {                return false;            }        }

然后，在线以图片的形式显示在网页上，分页显示调用一次显示一张图片，可以添加js做成类似于翻书的效果。

/// <summary>        /// 将Word转换为Png         /// </summary>        /// <param name="filepath">文件地址</param>        /// <param name="pageIndex">要转换的页</param>        /// <returns></returns>public void Word2Png(string filepath, int pageIndex)        {            MemoryStream memStream = new MemoryStream();            Aspose.Words.Document doc = new Aspose.Words.Document(filepath);            PageInfo pageInfo = Document.GetPageInfo(pageIndex);            float scale = 100 / 100.0f;            const int Resolution = 96;            Size imgSize = pageInfo.GetSizeInPixels(scale, Resolution);            using (Bitmap img = new Bitmap(imgSize.Width, imgSize.Height))            {                img.SetResolution(Resolution, Resolution);                using (Graphics gfx = Graphics.FromImage(img))                {                    gfx.Clear(Color.White);                    Document.RenderToScale(pageIndex, gfx, 0, 0, scale);                    img.Save(memStream, ImageFormat.Png);                    }                }            }            // Send the bitmap data to the output stream.            Response.ContentType = "image/png";            byte[] imageData = memStream.ToArray();            Response.OutputStream.Write(imageData, 0, imageData.Length);        }

Aspose.Cells.dll转换Excel为Pdf

将Excel转换为Pdf格式显示或保存。

/// <summary>        /// 将Word转换为Pdf         /// </summary>        /// <param name="strFilePath">文件地址</param>        /// <param name="savepath">保存地址</param>        /// <returns></returns>public bool Excel2Pdf(string fileName, string savepath)        {            try            {                Aspose.Cells.Workbook excel = new Aspose.Cells.Workbook(fileName);                //将ppt保存到指定路径下 savepath：保存路径                excel.Save(savepath, Aspose.Cells.SaveFormat.Pdf);                //将ppt保存至数据流中 再通过Response显示在页面中                MemoryStream memStream = new MemoryStream();                excel.Save(memStream, Aspose.Cells.SaveFormat.Pdf);                byte[] bt = memStream.ToArray();                Response.ContentType = "application/pdf";                Response.OutputStream.Write(bt, 0, bt.Length);                return true;            }            catch (Exception)            {                return false;            }        }

Aspose.Slides.dll 操作PPT

首先说转换为PDF格式存储和显示：

/// <summary>        /// 转换ppt文件在线预览        /// </summary>        /// <param name="fileName">文件路径</param>        /// <param name="savepath">保存路径</param>        /// <returns></returns>        public bool ppt2Pdf(string fileName, string savepath)        {            try            {                Aspose.Slides.Presentation ppt = new Aspose.Slides.Presentation(fileName);                //将ppt保存到指定路径下 savepath：保存路径                ppt.Save(savepath, Aspose.Slides.Export.SaveFormat.Pdf);                //将ppt保存至数据流中 再通过Response显示在页面中                MemoryStream memStream = new MemoryStream();                ppt.Save(memStream, Aspose.Slides.Export.SaveFormat.Pdf);                byte[] bt = memStream.ToArray();                Response.ContentType = "application/pdf";                Response.OutputStream.Write(bt, 0, bt.Length);                return true;            }            catch (Exception)            {                return false;            }        }

官网地址：www.aspose.com.
官方是要钱的，免费的大多数会有水印，不过神通广大的网友们还是有提供去除水印的dll，目前不知道是不是限时的。