public static UploadPartCommand Create()

in sdk/Commands/UploadPartCommand.cs [87:139]
43 lines of code
10 McCabe index (conditional complexity)

        public static UploadPartCommand Create(IServiceClient client, Uri endpoint, ExecutionContext context,
                                               UploadPartRequest uploadPartRequest)
        {
            OssUtils.CheckBucketName(uploadPartRequest.BucketName);
            OssUtils.CheckObjectKey(uploadPartRequest.Key);

            if (string.IsNullOrEmpty(uploadPartRequest.UploadId))
                throw new ArgumentException("uploadId should be specified");  
            if (!uploadPartRequest.PartNumber.HasValue)
                throw new ArgumentException("partNumber should be specified");
            if (!uploadPartRequest.PartSize.HasValue)
                throw new ArgumentException("partSize should be specified");
            if (uploadPartRequest.InputStream == null)
                throw new ArgumentException("inputStream should be specified");

            if (uploadPartRequest.PartSize < 0 || uploadPartRequest.PartSize > OssUtils.MaxFileSize)
                throw new ArgumentException("partSize not live in valid range");
            if (!OssUtils.IsPartNumberInRange(uploadPartRequest.PartNumber))
                throw new ArgumentException("partNumber not live in valid range");

            var conf = OssUtils.GetClientConfiguration(client);
            var originalStream = uploadPartRequest.InputStream;
            var streamLength = uploadPartRequest.PartSize.Value;

            // wrap input stream in PartialWrapperStream
            originalStream = new PartialWrapperStream(originalStream, streamLength);

            // setup progress
            var callback = uploadPartRequest.StreamTransferProgress;
            if (callback != null)
            {
                originalStream = OssUtils.SetupProgressListeners(originalStream, conf.ProgressUpdateInterval, client, callback);
                uploadPartRequest.InputStream = originalStream;
            }

            // wrap input stream in MD5Stream
            if (conf.EnalbeMD5Check)
            {
                var hashStream = new MD5Stream(originalStream, null, streamLength);
                uploadPartRequest.InputStream = hashStream;
                context.ResponseHandlers.Add(new MD5DigestCheckHandler(hashStream));
            }
            else if (conf.EnableCrcCheck)
            {
                var hashStream = new Crc64Stream(originalStream, null, streamLength);
                uploadPartRequest.InputStream = hashStream;
                context.ResponseHandlers.Add(new Crc64CheckHandler(hashStream));
            }

            return new UploadPartCommand(client, endpoint, context, 
                                         DeserializerFactory.GetFactory().CreateUploadPartResultDeserializer(uploadPartRequest.PartNumber.Value, streamLength),
                                        uploadPartRequest);
        }