C# 最齐全的上传图片方法

publicActionResult Upload()

{

stringimgurl ="";

foreach(stringkeyinRequest.Files)

{

//这里只测试上传第一张图片file[0]

HttpPostedFileBase file0 = Request.Files[key];

//转换成byte,读取图片MIME类型

Stream stream;

intsize = file0.ContentLength / 1024;//文件大小KB

if(size > 1024)

{

returnContent(ReturnMsg(Enum_Return.失败,"图片不能超过1M：",null));

}

byte[] fileByte =newbyte[2];//contentLength，这里我们只读取文件长度的前两位用于判断就好了，这样速度比较快，剩下的也用不到。

stream = file0.InputStream;

stream.Read(fileByte, 0, 2);//contentLength，还是取前两位

//获取图片宽和高

//System.Drawing.Image image = System.Drawing.Image.FromStream(stream);

//int width = image.Width;

//int height = image.Height;

stringfileFlag ="";

if(fileByte !=null&& fileByte.Length > 0)//图片数据是否为空

{

fileFlag = fileByte[0].ToString() fileByte[1].ToString();

}

string[] fileTypeStr = {"255216","7173","6677","13780"};//对应的图片格式jpg,gif,bmp,png

if(fileTypeStr.Contains(fileFlag))

{

stringaction = Request["action"];

stringpath ="/uploads/";

switch(action)

{

case"headimage":

path ="headimage/";

break;

case"blogtype":

path ="blogtype/";

break;

}

stringfullpath = path UserInfo.userID "/";

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

{

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

}

Request.Files[key].SaveAs(Server.MapPath(fullpath Request.Files[key].FileName));

imgurl = fullpath Request.Files[key].FileName;

}

else

{

returnContent(ReturnMsg(Enum_Return.失败,"图片格式不正确："fileFlag,null));

}

stream.Close();

}

returnContent(ReturnMsg(Enum_Return.成功,"上传成功", imgurl));

}

publicvoidProcessRequest(HttpContext context)

{

context.Response.ContentType ="application/json";

HttpPostedFile _upfile = context.Request.Files["File"];

if(_upfile.ContentLength

{

if(string.IsNullOrEmpty(_upfile.FileName))

{

context.Response.Write("请上传图片");

}

stringfileFullname = _upfile.FileName;

stringdataName = DateTime.Now.ToString("yyyyMMddhhmmss");

stringfileName = fileFullname.Substring(fileFullname.LastIndexOf("\") 1);

stringtype = fileFullname.Substring(fileFullname.LastIndexOf(".") 1);

if(type =="bmp"|| type =="jpg"|| type =="gif"|| type =="JPG"|| type =="BMP"|| type =="GIF")

{

_upfile.SaveAs(HttpContext.Current.Server.MapPath("photo") "\" dataName "." type);

HttpCookie cookie =newHttpCookie("photo");

context.Response.Write("上传成功");

}

else

{

context.Response.Write("支持格式：|jpg|gif|bmp|");

}

}

else

{

context.Response.Write("你的图片已经超过500K的大小！");

}

}