我们用NET+EF+MVC开发接口的时候，经常会遇到接收Base64字符串(图片)，并将Base64字符串图片post到图片服务器，一般来讲有同步和异步方法，同步的话图片会实时上传到图片服务器，但消耗网络带宽的资源较大，异步上传，消耗网络资源较小，缺点是网络不好的时候会上传不成功，同步和异步没有优劣之分，只是适合不同场景，下来笔者先介绍同步上传的方法（下一篇讲解异步上传方法）：

一、同步上传方法（OfflineUpdatehandexamination）

try

{

if(!string.IsNullOrEmpty(item.handexaminationBase64))

{

var ImagesBrowseServer = System.Web.Configuration.WebConfigurationManager.AppSettings["ImagesBrowseServer"].ToString();

#region 图片post到图片服务器

string url7 = "" + ImagesBrowseServer + "/Common/SaveBase64Image";

//string url7 = "http://127.0.0.1/Common/SaveBase64Image";

WebRequest request7 = WebRequest.Create(url7);

request7.Method = "POST";

//post传参数

string postdata = "strBase64=" + HttpContext.Current.Server.UrlEncode(item.handexaminationBase64) + "&subsidiary_id=" + item.subsidiary_id + "&KindergartenID=" + item.KindergartenID + "&Catalog=handexamination";

byte[] bytes = Encoding.ASCII.GetBytes(postdata);

request7.ContentType = "application/x-www-form-urlencoded";

request7.ContentLength = postdata.Length;

Stream sendStream = request7.GetRequestStream();

sendStream.Write(bytes, 0, bytes.Length);

sendStream.Close();

//得到返回值

WebResponse response7 = request7.GetResponse();

string OrderQuantity = new StreamReader(response7.GetResponseStream(), Encoding.GetEncoding("utf-8")).ReadToEnd();

var json = JsonConvert.DeserializeObject(OrderQuantity);

string image_path = json.photourl;

#endregion 图片post到图片服务器

#region 写入手检图片

if (!string.IsNullOrEmpty(image_path))

{

decimal detection_record_img_id = WisdomStarts.Common.Utils.GenerateIntID();

hx_detection_record_img img = new hx_detection_record_img();

img.detection_record_img_id = detection_record_img_id;

img.detection_record_id = 0;

img.image_path = image_path;

img.image_type = 1;

img.createtime = item.testingdate;

img.NewEnrolmentID = item.NewEnrolmentID;

img.testingtype = testingtype;

img.testingdate = item.testingdate.Date;

ef.hx_detection_record_img.Add(img);

ef.SaveChanges();

}

#endregion 写入手检图片

}

}

catch (Exception ee)

{

//WisdomStarts.Common.Log.NetLog.WriteTextLog("ee", ee.ToString());

}

二、将base64编码的字符串转为图片并保存

#region 将base64编码的字符串转为图片并保存

///

/// 将base64编码的字符串转为图片并保存

///

///

///

///

///

///

///

///

[HttpPost]

public ActionResult SaveBase64Image(string strBase64, string Catalog = "images", decimal subsidiary_id = 0, decimal KindergartenID = 0)

{

var str = "";

if (subsidiary_id > 0 && KindergartenID > 0)

{

try

{

string filePath = "/hx001/" + subsidiary_id + "/" + KindergartenID + "/" + Catalog + "/";

//string newFileName = Guid.NewGuid().ToString();

var fileExt = "jpg";

string fileName = Guid.NewGuid().ToString() + "." + fileExt;

//Log.Debug("filePath:" + filePath + fileName);

string strbase64 = strBase64.Substring(strBase64.IndexOf(',') + 1);

strbase64 = strbase64.Trim('\0');

//Log.Debug("strbase64:" + strbase64);

byte[] arr = Convert.FromBase64String(strbase64);

using (MemoryStream ms = new MemoryStream(arr))

{

//Log.Debug("进入了MemoryStream");

Bitmap bmp = new Bitmap(ms);

if (!Directory.Exists(Server.MapPath(filePath)))

{

//Log.Debug("没有Directory");

Directory.CreateDirectory(Server.MapPath(filePath));

}

//if (!Directory.Exists(filePath))

// Log.Debug("没有Directory");

//Directory.CreateDirectory(filePath);

//新建第二个bitmap类型的bmp2变量。

Bitmap bmp2 = new Bitmap(bmp, bmp.Width, bmp.Height);

//将第一个bmp拷贝到bmp2中

Graphics draw = Graphics.FromImage(bmp2);

draw.DrawImage(bmp, 0, 0);

draw.Dispose();

//Log.Debug("保存图片前");

bmp2.Save(Server.MapPath(filePath + fileName), System.Drawing.Imaging.ImageFormat.Jpeg);

//Log.Debug("保存图片后");

//bmp.Save("test.bmp", ImageFormat.Bmp);

//bmp.Save("test.gif", ImageFormat.Gif);

//bmp.Save("test.png", ImageFormat.Png);

ms.Close();

//return Content(filePath + fileName);

str = filePath + fileName;

}

}

catch(Exception ex)

{

//WisdomStarts.Common.Log.NetLog.WriteTextLog("SaveBase64Image上传图片错误", ex.ToString());

//WisdomStarts.Common.Log.NetLog.WriteTextLog("SaveBase64Image上传图片错误_strBase64", strBase64);

return Content("{\"status\":\"N\",\"msg\":\"上传失败！\",\"photourl\":\"\"}", "text/json");

}

}

if (str != "")

{

return Content("{\"status\":\"Y\",\"msg\":\"上传成功！\",\"photourl\":\"" + str + "\"}", "text/json");

}

else

{

return Content("{\"status\":\"N\",\"msg\":\"上传失败！\",\"photourl\":\"\"}", "text/json");

}

}

#endregion 将base64编码的字符串转为图片并保存