上传文件时的后台处理

asp.net core 上传文件controller保存
long size = 0;
var files = Request.Form.Files;
if (0 == Request.Form.Files.Count()) return Json("NoPicture");
foreach (var file in files)
{
var filename = ContentDispositionHeaderValue
.Parse(file.ContentDisposition)
.FileName
.Trim('"');
filename = env.WebRootPath + $@"{filename}";
size += file.Length;
using (FileStream fs = System.IO.File.Create(filename))
{
file.CopyTo(fs);
fs.Flush();
}
}

//IFormFile
var filename = formfile.FileName;
filename = env.WebRootPath + $@"{filename}";
size += formfile.Length;
using (FileStream fs = System.IO.File.Create(filename))
{
formfile.CopyTo(fs);
fs.Flush();
}

//database save the data which is not text

FileStream fs = new FileStream(@"D:a.jpg", FileMode.Open,FileAccess.Read);
Byte[] btye2 = new byte[fs.Length];
fs.Read(btye2 , 0, Convert.ToInt32(fs.Length));
fs.Close();
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "insert into Photo(imgfile) values(@imgfile)";
SqlParameter par = new SqlParameter("@imgfile", SqlDbType.Image);
par.Value = bt;
cmd.Parameters.Add(par);
int t=(int)(cmd.ExecuteNonQuery());
conn.Close();
}