private UpLoadFileResult UpLoadPicture(System.IO.Stream file, string dirPath, string fileName = "")
{
UpLoadFileResult upLoadFileResult = new UpLoadFileResult();
string encodingName = "utf-8";
string imgType = string.Empty;
List <string> typeList = new List <string>()
{
"JPG", "BMP", "PNG", "JPEG"
};
using (MemoryStream ms = new MemoryStream())
{
file.CopyTo(ms);
ms.Position = 0;
var encoding = Encoding.GetEncoding(encodingName);
var reader = new StreamReader(ms, encoding);
var headerLength = 0L;
//读取第一行
var firstLine = reader.ReadLine();
//计算偏移（字符串长度+回车换行2个字符）
headerLength += encoding.GetBytes(firstLine).LongLength + 2;
//读取第二行
var secondLine = reader.ReadLine();
//计算偏移（字符串长度+回车换行2个字符）
headerLength += encoding.GetBytes(secondLine).LongLength + 2;
//解析文件名
string orgFileName = new System.Text.RegularExpressions.Regex("filename=\"(?<fn>.*)\"").Match(secondLine).Groups["fn"].Value;
if (string.IsNullOrEmpty(fileName))
{
fileName = orgFileName;
}
else
{
fileName = orgFileName.Replace(orgFileName.Substring(0, orgFileName.LastIndexOf('.')), fileName);
}
//判断图片格式
imgType = fileName.Substring(fileName.LastIndexOf('.') + 1).ToUpper();
if (!typeList.Contains(imgType))
{
upLoadFileResult.FileName = "errorType";
upLoadFileResult.success = false;
return(upLoadFileResult);
}
//一直读到空行为止
while (true)
{
//读取一行
var line = reader.ReadLine();
//若到头，则直接返回
if (line == null)
{
break;
}
//若未到头，则计算偏移（字符串长度+回车换行2个字符）
headerLength += encoding.GetBytes(line).LongLength + 2;
if (line == "")
{
break;
}
}
//设置偏移，以开始读取文件内容
ms.Position = headerLength;
////减去末尾的字符串：“/r/n--/r/n”
ms.SetLength(ms.Length - encoding.GetBytes(firstLine).LongLength - 3 * 2);
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string path = Path.Combine(dirPath, fileName);
using (FileStream fileToupload = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
{
ms.CopyTo(fileToupload);
fileToupload.Flush();
}
upLoadFileResult.FileName = fileName;
upLoadFileResult.success = true;
}
return(upLoadFileResult);
}
