C# WebAPi接收和发送图片

先上一个准备代码：image和字节数组相互转换：

//字节数组转image
//pic是字节数组
System.IO.MemoryStream ms = new System.IO.MemoryStream(pic);
System.Drawing.Image image = System.Drawing.Image.FromStream(ms);

//image转字节数组
MemoryStream newms = new MemoryStream();
image.Save(newms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] BPicture = new byte[newms.Length];
BPicture = newms.GetBuffer();

现在介入正题，我们这个字节数组哪里来的呢？要么是从服务器的文件系统中拉的，要么是从数据库里拉的，这边不介绍前者，介绍一下后者。我使用的数据库是Oracle，这边 PAT_PIC字段是Oracle的blob类型,

先写get方法：

public string GetPatientPicByHemoId(string hemoId)
{
    string result = string.Empty;
    PatientModel.MED_PATIENTS_PICDataTable dtPic = _patientService.GetPatientPicByHemoId(hemoId);
    if (dtPic != null && dtPic.Rows.Count > 0)
    {
          byte[] pic = dtPic[0].PAT_PIC;
          result = Convert.ToBase64String(pic);
    }
    eturn result.Length > 0 ? Utility.StringToJsonBySuccess(result, true) : Utility.StringToJsonBySuccess(result, false);
 }

然后写下save方法：

　　　　　[HttpPost]
        [Route("Api/MedPatient/UploadInternalPhoto")]
        public async Task<string> UploadInternalPhoto()
        {
            int result = 0;
            string message = string.Empty;
            bool success = false;

            try
            {
                Logger.Info("开始调用UploadPatientPhoto...");
                string filePath = "~\UploadFiles\Photo";
                string dir = HttpContext.Current.Server.MapPath(filePath);
                if (!Directory.Exists(dir))
                    Directory.CreateDirectory(dir);
                if (!Request.Content.IsMimeMultipartContent("form-data"))
                {
                    throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
                }

                string fileFullName = string.Empty;
                var provider = new CustomMultipartFormDataStreamProvider(dir);
                await Request.Content.ReadAsMultipartAsync(provider);
                string hemoId = provider.FormData.Get("hemoId");
                MultipartFileData file = provider.FileData.FirstOrDefault();
                if (file != null) { fileFullName = dir + file.LocalFileName.Substring(file.LocalFileName.LastIndexOf("\")); }

                var imageCodecInfoList = ImageCodecInfo.GetImageEncoders();
                string mimeType = "image/jpeg";
                ImageCodecInfo myImageCodec = null;
                foreach (var imgCodec in imageCodecInfoList)
                {
                    if (imgCodec.MimeType == mimeType)
                    {
                        myImageCodec = imgCodec;
                        break;
                    }
                }

                if (myImageCodec == null)
                    return null;

                EncoderParameters encoderParams = new EncoderParameters(1);
                System.Drawing.Imaging.Encoder myCompressQuanlityEncoder = System.Drawing.Imaging.Encoder.Quality;
                EncoderParameter myCompressQualityParam = new EncoderParameter(myCompressQuanlityEncoder, 80L);
                encoderParams.Param[0] = myCompressQualityParam;
                byte[] tempImage;

                using (Bitmap bmpPic = new Bitmap(fileFullName))
                {
                    using (MemoryStream msPicture = new MemoryStream())
                    {
                        bmpPic.Save(msPicture, myImageCodec, encoderParams);
                        tempImage = msPicture.ToArray();
                    }
                }

                InternalModel.MED_INTERNAL_PICDataTable pic = _internal.GetInternalPic(hemoId);
                if (pic != null && pic.Rows.Count > 0)
                {
                    pic[0].PAT_PIC = tempImage;
                }
                else
                {
                    var row = pic.NewMED_INTERNAL_PICRow();
                    row.HEMOID = hemoId;
                    row.PAT_PIC = tempImage;
                    pic.AddMED_INTERNAL_PICRow(row);
                }
                result = _internal.SaveInternalPic(pic);
                

                success = true;
            }
            catch (Exception ex)
            {
                message = ex.Message;
                Logger.Error("上传患者照片失败", ex);
            }

            return Utility.StringToJsonBySuccess(message, success);
        }

以下是StringToJsonBySuccess方法

/// <summary>
/// 字符串转换成Json带是否成功标记
/// </summary>
/// <param name="result"></param>
/// <param name="success"></param>
/// <returns></returns>

　　　　　

　　　　　public static string StringToJsonBySuccess(string result, bool success)
        {
            if (success)
            {
                result = "{"SUCCESS":"TRUE","DATA":"" + result + ""}";
            }
            else
            {
                result = "{"SUCCESS":"FALSE"}";
            }
            return result;
        }

好了！明天国庆节提前回家喽~