public bool UpLoadJpg(FileUpload UploadFile)
{
if (UploadFile.HasFile)//检查是否已经选择文件
{
string filename = UploadFile.FileName.ToLower();
int i = filename.LastIndexOf(".");
filename = filename.Substring(i, filename.Length - i);
if (!(filename == ".jpg" || filename == ".jpeg" || filename == ".bmp"))
{
MSG = "请选择jpg或bmp格式的图片！";
return(false);
}//检查上传文件的格式是否有效
if (UploadFile.PostedFile.ContentLength == 0 || UploadFile.PostedFile.ContentLength >= Size)
{
MSG = "指定的文件大小不符合要求，应在" + Size.ToString() + "字节以内！";
return(false);
}//检查图片文件的大小
//生成原图
//System.Drawing.Image imgFile = System.Drawing.Image.FromFile(Filename);
//imgFile.Save(NewFilename, DesiredFormat);
Stream oStream = UploadFile.PostedFile.InputStream;
System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
int owidth = oImage.Width; //原图宽度
int oheight = oImage.Height; //原图高度
if (owidth > LimitWidth || oheight > LimitHeight)
{
MSG = "超过允许的图片尺寸范围，应在" + LimitWidth.ToString() + "×" + LimitHeight.ToString() + "范围内！";
return(false);
}//检查是否超出规定尺寸
if (IsRate)
{
//按比例计算出缩略图的宽度和高度
if (owidth >= oheight)
{
THeight = (int)Math.Floor(Convert.ToDouble(oheight) * (Convert.ToDouble(TWidth) / Convert.ToDouble(owidth)));//等比设定高度
}
else
{
TWidth = (int)Math.Floor(Convert.ToDouble(owidth) * (Convert.ToDouble(THeight) / Convert.ToDouble(oheight)));//等比设定宽度
}
}
//生成缩略原图
Bitmap tImage = new Bitmap(TWidth, THeight);
Graphics g = Graphics.FromImage(tImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //设置高质量,低速度呈现平滑程度
g.Clear(Color.Transparent); //清空画布并以透明背景色填充
g.DrawImage(oImage, new Rectangle(0, 0, TWidth, THeight), new Rectangle(0, 0, owidth, oheight), GraphicsUnit.Pixel);
Random oRandom = new Random();
string oStringRandom = oRandom.Next(9999).ToString();//生成4位随机数字
//格式化日期作为文件名
DateTime oDateTime = new DateTime();
oDateTime = DateTime.Now;
string oStringTime = oDateTime.ToString("yyyyMMddHHmmss");
filename = ".jpg";
OFileName = "o" + oStringTime + oStringRandom + filename;
TFileName = "t" + oStringTime + oStringRandom + filename;
string oSavePath = HttpContext.Current.Server.MapPath("~") + @"\" + Path + @"\";
if (!Directory.Exists(oSavePath))
{
Directory.CreateDirectory(oSavePath);//在根目录下建立文件夹
}
//保存路径+完整文件名
OFullName = oSavePath + OFileName;
//TFullName = oSavePath + TFileName;
//开始保存图片至服务器
try
{
oImage.Save(OFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
MSG = "图片上传成功！";
return(true);
}
catch (Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose();
g.Dispose();
tImage.Dispose();
}
}
else
{
MSG = "请先选择需要上传的图片！";
return(false);
}
}
/// <summary>
/// 图片上传(默认:"等比压缩,限定上传尺寸2048*1536,缩略图尺寸100*100,限定上传大小1MB,存放在根目录UpdateFile中")
/// </summary>
/// <param name="UploadFile">文件上传控件</param>
/// <returns>返回是否成功保存图片</returns>
public bool UpLoadIMG(FileUpload UploadFile)
{
if (UploadFile.HasFile)//检查是否已经选择文件
{
string filename = System.IO.Path.GetFileName(UploadFile.FileName);
filename = System.IO.Path.GetExtension(filename);
if (!(filename == ".jpg" || filename == ".jpeg" || filename == ".bmp" || filename == ".gif" || filename == ".png"))
{
MSG = "不受支持的类型,请重新选择！";
return(false);
}//检查上传文件的格式是否有效
if (UploadFile.PostedFile.ContentLength == 0 || UploadFile.PostedFile.ContentLength >= Size)
{
MSG = "指定的文件大小不符合要求，应在" + Size.ToString() + "字节以内！";
return(false);
}//检查图片文件的大小
//生成原图
Stream oStream = UploadFile.PostedFile.InputStream;
System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
int owidth = oImage.Width; //原图宽度
int oheight = oImage.Height; //原图高度
if (owidth > LimitWidth || oheight > LimitHeight)
{
MSG = "超过允许的图片尺寸范围，应在" + LimitWidth.ToString() + "×" + LimitHeight.ToString() + "范围内！";
return(false);
}//检查是否超出规定尺寸
Bitmap tImage = new Bitmap(TWidth, THeight);
if (IsThumbnail)
{
tImage = ImageHelper.MakeThumbnail(oImage, TWidth, THeight, IsRate);
}
Random oRandom = new Random();
string oStringRandom = oRandom.Next(9999).ToString();//生成4位随机数字
//格式化日期作为文件名
DateTime oDateTime = new DateTime();
oDateTime = DateTime.Now;
string oStringTime = oDateTime.ToString("yyyyMMddHHmmss");
OFileName = "o" + oStringTime + oStringRandom + filename;
TFileName = "t" + oStringTime + oStringRandom + filename;
string oSavePath = HttpContext.Current.Server.MapPath("~") + @"\" + Path + @"\";
if (!Directory.Exists(oSavePath))
{
Directory.CreateDirectory(oSavePath);//在根目录下建立文件夹
}
//保存路径+完整文件名
OFullName = oSavePath + OFileName;
TFullName = oSavePath + TFileName;
//开始保存图片至服务器
try
{
switch (filename)
{
case ".jpeg":
case ".jpg":
{
oImage.Save(OFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
if (IsThumbnail)
{
tImage.Save(TFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
break;
}
case ".gif":
{
oImage.Save(OFullName, System.Drawing.Imaging.ImageFormat.Gif);
if (IsThumbnail)
{
tImage.Save(TFullName, System.Drawing.Imaging.ImageFormat.Gif);
}
break;
}
case ".png":
{
oImage.Save(OFullName, System.Drawing.Imaging.ImageFormat.Png);
if (IsThumbnail)
{
tImage.Save(TFullName, System.Drawing.Imaging.ImageFormat.Png);
}
break;
}
case ".bmp":
{
oImage.Save(OFullName, System.Drawing.Imaging.ImageFormat.Bmp);
if (IsThumbnail)
{
tImage.Save(TFullName, System.Drawing.Imaging.ImageFormat.Bmp);
}
break;
}
}
MSG = "图片上传成功！";
return(true);
}
catch (Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose();
tImage.Dispose();
}
}
else
{
MSG = "请先选择需要上传的图片！";
return(false);
}
}