C#根据传入的id截图生成附件、根据id生成下载链接、根据链接下载附件

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using Microsoft.Ajax.Utilities; using Newtonsoft.Json; using Newtonsoft.Json.Linq; using PuppeteerSharp; using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Data.SqlTypes; using System.IO; using System.Linq; using System.Net; using System.Net.Http; using System.Net.Http.Headers; using System.Text; using System.Text.RegularExpressions; using System.Threading.Tasks; using System.Web.Configuration; using System.Web.Helpers; using System.Web.Http; using WXHRApi.Controllers.OtherHelper; using WXHRApi.Models; using WXHRApi.Models.ApprovalTask; using WXHRApi.Models.CommonDto; using WXHRApi.Models.CusTom;   namespace WXHRApi.Controllers {     [RoutePrefix("api/ApprovalTask")]     public class ApprovalTaskController : ApiController     {                   /// <summary>         /// 根据传入的TaskId模拟导出表单截图为pdf         /// </summary>         /// <returns></returns>         //[AcceptVerbs("GET", "POST")]         //[Route("ExportAsPdfAsync")]         //public async Task<ResponseResult> ExportAsPdfAsync(string taskId, string sn)         //{         //    ResponseResult resResult = new ResponseResult();           //    // 1. 下载 Chromium（只需一次）          //    var browserFetcher = new BrowserFetcher();         //    var installedBrowsers = browserFetcher.GetInstalledBrowsers();           //    if (!installedBrowsers.Any())         //    {         //        // 如果没有已安装的浏览器，下载 Chromium         //        await browserFetcher.DownloadAsync();         //        LogHel.WriteLog("1.Chromium 下载完成");         //    }         //    else         //    {         //        LogHel.WriteLog("1.Chromium 已经存在，无需下载");         //    }           //    // 2. 启动浏览器          //    try         //    {         //        using (var browser = await Puppeteer.LaunchAsync(new LaunchOptions         //        {         //            Headless = true, // 设置为无头模式（没有UI）          //            //ExecutablePath = chromePath,         //            Args = new[] { "--no-sandbox", "--disable-setuid-sandbox" }         //        }))         //        {         //            // 3. 打开新页面          //            using (var page = await browser.NewPageAsync())         //            {         //                var requestUrl = WebConfigurationManager.AppSettings["PDFBaseRequestUrl"];         //                var account = WebConfigurationManager.AppSettings["BPMUser"];         //                if (!string.IsNullOrEmpty(taskId))         //                {         //                    requestUrl = requestUrl + "?isnoLogin=true&tid=" + taskId;         //                }         //                // 4. 导航到指定页面          //                try         //                {         //                    await page.GoToAsync(requestUrl, new NavigationOptions { Timeout = 150000 });         //                }         //                catch (Exception ex)         //                {         //                    resResult.Code = 500;         //                    resResult.Message = $"导航到页面失败，错误：{ex.Message}";         //                    return resResult;         //                }           //                string fileId = PostProcess.GetNewFileID();         //                if (string.IsNullOrEmpty(fileId))         //                {         //                    resResult.Code = 500;         //                    resResult.Message = "附件ID获取失败！";         //                }           //                //获取文件保存完整路径         //                string savePathRoot = WebConfigurationManager.AppSettings["AttachmentRootPath"];           //                savePathRoot = PostProcess.FileIDToPath(fileId, savePathRoot);           //                var dirPath = savePathRoot.Substring(0, savePathRoot.LastIndexOf(@"\"));         //                if (!Directory.Exists(dirPath))         //                    Directory.CreateDirectory(dirPath);         //                AttachmentInfo attInfo = new AttachmentInfo()         //                {         //                    FileID = fileId,         //                    Ext = ".pdf",         //                    Name = sn + ".PDF",         //                    LastUpdate = DateTime.Now,         //                    OwnerAccount = account,         //                    Size = 0,         //                };           //                resResult.Data = fileId;         //                //延时一段时间,否则可能截图到空白页         //                await Task.Delay(2000);           //                // 5. 截图保存为图片          //                await page.PdfAsync($"{savePathRoot}");         //                //6.保存附件信息         //                string connectionString = Convert.ToString(WebConfigurationManager.ConnectionStrings["BPMDB"]);         //                using (SqlConnection cn = new SqlConnection(connectionString))         //                {         //                    try         //                    {         //                        cn.Open();         //                        PostProcess.Insert(cn, attInfo);         //                    }         //                    catch (SqlException e)         //                    {         //                        cn.Close();         //                        resResult.Code = 500;         //                        resResult.Message = $"附件信息插入失败，错误原因：{e.Message}";         //                    }         //                }         //            }           //            // 7. 关闭浏览器          //            await browser.CloseAsync();           //            return resResult;         //        }         //    }         //    catch (Exception ex)         //    {         //        resResult.Code = 500;         //        resResult.Message = $"保存PDF异常，错误原因：{ex.Message}，{ex.StackTrace}";         //        return resResult;         //    }         //}           /// <summary>         /// 根据fileId生成下载文件地址         /// </summary>         /// <param name="fileID"></param>         /// <returns></returns>           [Route("DownLoadFileByID")]         //[HttpPost]         [AcceptVerbs("GET", "POST")]         public HttpResponseMessage DownLoadFileByID(string fileID)         {             byte[] buffer;             string attachmentRootPath = WebConfigurationManager.AppSettings["AttachmentRootPath"];             string FilePath = Path.Combine(attachmentRootPath, AttachmentInfo.FileIDToPath(fileID));             var obj = AttachmentHel.GetAttachmentInfo(fileID);               string FileName = obj.Name;             if (!File.Exists(FilePath))                 throw new Exception(string.Format(Resources.YZStrings.Aspx_Upload_FileIDNotFount, FileName));             try             {                     using (FileStream stream = new FileInfo(FilePath).OpenRead())                 {                     buffer = new Byte[stream.Length];     //从流中读取字节块并将该数据写入给定缓冲区buffer中                     stream.Read(buffer, 0, Convert.ToInt32(stream.Length));                 }                 HttpResponseMessage httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK);                 httpResponseMessage.Content = new StreamContent(new MemoryStream(buffer));                 httpResponseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");                 var disPosition = new ContentDispositionHeaderValue("attachment");                 //IE等浏览器文件名中文乱码问题处理                 var userAgent = Request.Headers.UserAgent.ToString().ToUpper();                 if (userAgent.Contains("MSIE") || userAgent.Contains("TRIDENT") || userAgent.Contains("EDGE"))                 {                     disPosition.FileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);                     //disPosition.Name = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);                     //disPosition.Size = (long)FileName.Length;                 }                 else                 {                     disPosition.FileName = FileName;                     //disPosition.Name = FileName;                     //disPosition.Size = (long)FileName.Length;                 }                 httpResponseMessage.Content.Headers.ContentDisposition = disPosition;                                   //httpResponseMessage.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")                 //{                 //    FileName = FileName,                 //};                 return httpResponseMessage;             }             catch (Exception)             {                   return new HttpResponseMessage(HttpStatusCode.NoContent);             }         }             /// <summary>         /// 根据fileId下载文件         /// </summary>         /// <param name="fileID"></param>         /// <returns></returns>           [Route("SaveFileById")]         //[HttpPost]         [AcceptVerbs("GET", "POST")]         public async Task SaveFileById(string fileID)         {             string url = $"http://xxx/api/ApprovalTask/DownLoadFileByID?fileID={fileID}";             string saveDirectory = @"C:\xxx\"; // 替换为保存文件的路径和文件名               try             {                 using (HttpClient client = new HttpClient())                 {                     // 发送 GET 请求                     HttpResponseMessage response = await client.GetAsync(url);                       // 确保响应成功                     response.EnsureSuccessStatusCode();                       // 获取文件名                     string fileName = GetFileNameFromResponse(response) ?? "default_file";                       // 拼接完整保存路径                     string saveFilePath = Path.Combine(saveDirectory, fileName);                       // 读取内容为字节流                     byte[] fileBytes = await response.Content.ReadAsByteArrayAsync();                       // 保存到本地文件                     File.WriteAllBytes(saveFilePath, fileBytes);                       Console.WriteLine("文件保存成功：" + saveFilePath);                 }             }             catch (Exception ex)             {                 Console.WriteLine("下载文件失败：" + ex.Message);             }         }           /// <summary>         /// 获取文件名         /// </summary>         /// <param name="response"></param>         /// <returns></returns>         private static string GetFileNameFromResponse(HttpResponseMessage response)         {             if (response.Content.Headers.ContentDisposition != null)             {                 return response.Content.Headers.ContentDisposition.FileName?.Trim('"');             }               if (response.Headers.TryGetValues("Content-Disposition", out var values))             {                 string disposition = string.Join(";", values);                 var fileNameMarker = "filename=";                 int index = disposition.IndexOf(fileNameMarker, StringComparison.OrdinalIgnoreCase);                 if (index >= 0)                 {                     int startIndex = index + fileNameMarker.Length;                     int endIndex = disposition.IndexOf(';', startIndex);                     if (endIndex < 0) endIndex = disposition.Length;                       string encodedString = disposition.Substring(startIndex, endIndex - startIndex).Trim('"');                     if (string.IsNullOrEmpty(encodedString))                         return null;                       //解码 MIME 编码的字符串                     //匹配 MIME 编码格式：=?utf-8?B?...?=                     var match = Regex.Match(encodedString, @"=\?utf-8\?B\?(?<encodedText>[A-Za-z0-9+/=]+)\?=", RegexOptions.IgnoreCase);                     if (match.Success)                     {                         string base64EncodedText = match.Groups["encodedText"].Value;                         byte[] bytes = Convert.FromBase64String(base64EncodedText);                         return Encoding.UTF8.GetString(bytes);                     }                       return encodedString; // 如果不是 MIME 编码，直接返回原始字符串                 }             }               return null; // 如果无法获取文件名，返回 null         }     } }