上传图片
public int UpdateImgs(FileUpload FileUpload1, HttpServerUtility server, int id)
{
//如果不是图片文件
if (!isImg(FileUpload1))
return 0;
string fileName = FileUpload1.FileName;
string FileFullName = FileUpload1.PostedFile.FileName;
string type = Path.GetExtension(FileUpload1.FileName);//文件类型
string sImgName = id + "s" + type;//小封面文件名
string bImgName = id + "b" + type;//大封面文件名
string sSaveImgPath = server.MapPath("~/BooksImages/" + sImgName.Trim());
string bSaveImgPath = server.MapPath("~/BooksImages/" + bImgName.Trim());
//图片转为流
Stream st = FileUpload1.PostedFile.InputStream;
Bitmap SmalBt = (Bitmap)System.Drawing.Image.FromStream(st);
Bitmap BigBt = (Bitmap)System.Drawing.Image.FromStream(st);
st.Close();
//改变图片大小
Bitmap SmalBm = new Bitmap(SmalBt, new Size(150, 180));
Bitmap BigBm = new Bitmap(BigBt, new Size(350, 350));
//保存图片
SmalBm.Save(sSaveImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
BigBm.Save(bSaveImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
return BookDAL.UpdateImgs(id, sImgName, bImgName);
}
//是否为图片文件
public bool isImg(FileUpload FileUpload1)
{
bool fileOK = false;
string fileName = FileUpload1.FileName;//上传文件名称
String[] Extensions = { ".gif", ".png", ".jpeg", ".jpg", ".bmp" };//允许的扩展名
if (FileUpload1.HasFile)
{
String fileExtension = Path.GetExtension(fileName).ToLower();
for (int i = 0; i < Extensions.Length; i++)
{
if (fileExtension == Extensions[i])
{
fileOK = true;
}
}
}
return fileOK;
}
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