WCF 学习文件流服务的总结，实现文件服务端、客户端上传下载文件功能

服务的建立类似之前的文章：https://blog.youkuaiyun.com/glmushroom/article/details/84955240

文件服务的区别ServiceHost的typeof的类型：

            UriBuilder uriBuilder = new UriBuilder(Uri.UriSchemeHttp, host, port, FilesService.strServiceName);
            FilesService._host = new ServiceHost(typeof(FileService), new Uri[]
            {
                uriBuilder.Uri
            });

客户端连接服务器后，利用RPC模式远程调用服务端上的UploadFile接口。

注意：客户端文件流的重写方法Read是在调用了RPC服务端方法时执行的

        public bool UploadFile(string LocalFileFullPath, FileInfoRequest request)
        {
            bool result = false;
            try
            {
                if (!request.ForderPath.EndsWith("\\"))
                {
                    request.ForderPath += "\\";
                }
                FileInfo fileInfo = new FileInfo(LocalFileFullPath);
                if (!fileInfo.Exists)
                {
                    throw new FileNotFoundException("File not found", request.FileName);
                }
                using (FileStream fileStream = new FileStream(LocalFileFullPath, FileMode.Open, FileAccess.Read))
                {
                    using (StreamWithUpLoadProgress streamWithUpLoadProgress = new StreamWithUpLoadProgress(request.FileID, fileStream))
                    {
                        streamWithUpLoadProgress.ProgressChanged += new EventHandler<StreamWithUpLoadProgress.ProgressChangedEventArgs>(this.uploadStreamWithProgress_ProgressChanged);
                        RemoteFileInfo request2 = new RemoteFileInfo
                        {
                            FileID = request.FileID,
                            FileName = request.FileName,
                            ForderPath = request.ForderPath,
                            Length = fileInfo.Length,
                            FileByteStream = streamWithUpLoadProgress
                        };
                        this._service.UploadFile(request2);
                    }
                }
                result = true;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message, ex);
            }
            return result;
        }

this._service.UploadFile(request2);调用时，通讯层调用远程的Upload方法：

public void UploadFile(RemoteFileInfo request)
        {
            try
            {
                if (!Directory.Exists(request.ForderPath))
                {
                    Directory.CreateDirectory(request.ForderPath);
                }
                string path = Path.Combine(request.ForderPath, request.FileName);
                if (File.Exists(path))
                {
                    File.Delete(path);
                }
                int num = 2048;
                byte[] buffer = new byte[num];
                using (FileStream fileStream = new FileStream(path, FileMode.CreateNew, FileAccess.Write))
                {
                    while (true)
                    {
                        int num2 = request.FileByteStream.Read(buffer, 0, num);
                        if (num2 == 0)
                        {
                            break;
                        }
                        fileStream.Write(buffer, 0, num2);
                    }
                    fileStream.Close();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

调用过程是利用RPC框架实现的：

客户端调用远程方法UploadFile，通讯层调用了文件流的重写方法Read。