.NET 图片上传
/// <summary>/// asp.net上传图片并生成缩略图
/// </summary>
/// <param name="upImage">HtmlInputFile控件</param>
/// <param name="sSavePath">保存的路径,些为相对服务器路径的下的文件夹</param>
/// <param name="sThumbExtension">缩略图的thumb</param>
/// <param name="intThumbWidth">生成缩略图的宽度</param>
/// <param name="intThumbHeight">生成缩略图的高度</param>
/// <returns>缩略图名称</returns>
public string UpLoadImage(FileUpload upImage, string savePath, string sThumbExtension, int intThumbWidth, int intThumbHeight)
{
if (upImage.HasFile)
{
if (upImage.PostedFile.ContentLength > 0 && upImage.PostedFile.ContentLength / 1024 < 1024)
{
string imgType = upImage.PostedFile.ContentType.ToString(); // 图片类型
if (imgType.Equals("image/pjpeg") || imgType.Equals("image/gif") || imgType.Equals("image/png"))
{
//取得上传文件的扩展名
string strExt = upImage.PostedFile.FileName.Substring(upImage.PostedFile.FileName.LastIndexOf("."));
// 自定义名称保存
string newImaName = (sThumbExtension + strExt).ToString();
// 保存到指定目录
string newsavePath = Server.MapPath(savePath);
System.Drawing.Image img = System.Drawing.Image.FromFile(upImage.PostedFile.FileName);
if (img.Width < intThumbWidth && img.Height < intThumbHeight)
{
return "图片的宽度和高度不符合(" + intThumbWidth + "*" + intThumbHeight+")";
}
else
{
upImage.PostedFile.SaveAs(newsavePath + newImaName);
return "上传图片成功.";
}
//try
//{
// //原图加载
// using (System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(upImage.PostedFile.FileName))
// {
// //原图宽度和高度
// int width = sourceImage.Width;
// int height = sourceImage.Height;
// int smallWidth;
// int smallHeight;
// //获取第一张绘制图的大小,(比较 原图的宽/缩略图的宽和 原图的高/缩略图的高)
// if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
// {
// smallWidth = intThumbWidth;
// smallHeight = intThumbWidth * height / width;
// }
// else
// {
// smallWidth = intThumbHeight * width / height;
// smallHeight = intThumbHeight;
// }
// // 新建一个图板,以最小等比例压缩大小绘制原图
// using (System.Drawing.Image bitmap = new System.Drawing.Bitmap(smallWidth, smallHeight))
// {
// //绘制中间图
// using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
// {
// //高清,平滑
// g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// g.Clear(Color.Black);
// g.DrawImage(
// sourceImage,
// new System.Drawing.Rectangle(0, 0, smallWidth, smallHeight),
// new System.Drawing.Rectangle(0, 0, width, height),
// System.Drawing.GraphicsUnit.Pixel);
// }
// //新建一个图板,以缩略图大小绘制中间图
// using (System.Drawing.Image bitmap1 = new System.Drawing.Bitmap(intThumbWidth, intThumbHeight))
// {
// //绘制缩略图
// using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap1))
// {
// //高清,平滑
// g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// g.Clear(Color.Black);
// int lwidth = (smallWidth - intThumbWidth) / 2;
// int bheight = (smallHeight - intThumbHeight) / 2;
// g.DrawImage(bitmap, new Rectangle(0, 0, intThumbWidth, intThumbHeight), lwidth, bheight, intThumbWidth, intThumbHeight, GraphicsUnit.Pixel);
// g.Dispose();
// //缩略图保存的绝对路径
// bitmap1.Save(newsavePath, System.Drawing.Imaging.ImageFormat.Jpeg);
// }
// }
// }
// }
//}
//catch(Exception ex)
//{
// return ex.Message.ToString();
//}
}
else
{
return "图片类型不正确.";
}
}
else
{
return "请选择不大于1M的图片.";
}
}
else
{
return "没有选择图片";
}
}
(/// <summary>
/// asp. Net upload pictures and generate thumbnails
/// </summary>
///< param name = "upimage" > htmlinputfile control < / param >
///< param name = "ssavepath" > the saved paths are the folders under the relative server path < / param >
///< param name = "sthumbextension" > thumb of thumbnail < / param >
///< param name = "intthumbwidth" > width of generated thumbnail < / param >
///< param name = "intthumbheight" > height of generated thumbnail < / param >
///< returns > thumbnail name < / returns >
public string UpLoadImage(FileUpload upImage, string savePath, string sThumbExtension, int intThumbWidth, int intThumbHeight)
{
if (upImage.HasFile)
{
if (upImage.PostedFile.ContentLength > 0 && upImage.PostedFile.ContentLength / 1024 < 1024)
{
string imgType = upImage. PostedFile. ContentType. ToString(); //Picture type
if (imgType.Equals("image/pjpeg") || imgType. Equals("image/gif") || imgType. Equals("image/png"))
{
//Gets the extension of the uploaded file
string strExt = upImage. PostedFile. FileName. Substring(upImage.PostedFile.FileName.LastIndexOf("."));
//Custom name save
string newImaName = (sThumbExtension + strExt). ToString();
//Save to specified directory
string newsavePath = Server. MapPath(savePath);
System. Drawing. Image img = System. Drawing. Image. FromFile(upImage.PostedFile.FileName);
if (img.Width < intThumbWidth && img.Height < intThumbHeight)
{
Return "the width and height of the picture do not match (" + intthumbwidth + "*" + intthumbheight + ")";
}
else
{
upImage. PostedFile. SaveAs(newsavePath + newImaName);
Return "the picture was uploaded successfully.";
}
//try
//{
/// / original image loading
// using (System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(upImage.PostedFile.FileName))
// {
/// / original width and height
// int width = sourceImage. Width;
// int height = sourceImage. Height;
// int smallWidth;
// int smallHeight;
/// / obtain the size of the first drawing (compare the width of the original drawing / the width of the thumbnail with the height of the original drawing / the height of the thumbnail)
// if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
// {
// smallWidth = intThumbWidth;
// smallHeight = intThumbWidth * height / width;
// }
// else
// {
// smallWidth = intThumbHeight * width / height;
// smallHeight = intThumbHeight;
// }
/// / create a new drawing board and draw the original drawing with the minimum equal scale compression size
// using (System.Drawing.Image bitmap = new System.Drawing.Bitmap(smallWidth, smallHeight))
// {
/// / draw the middle diagram
// using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
// {
/// / HD, smooth
// g.InterpolationMode = System. Drawing. Drawing2D. InterpolationMode. High;
// g.SmoothingMode = System. Drawing. Drawing2D. SmoothingMode. HighQuality;
// g.Clear(Color.Black);
// g.DrawImage(
// sourceImage,
// new System. Drawing. Rectangle(0, 0, smallWidth, smallHeight),
// new System. Drawing. Rectangle(0, 0, width, height),
// System. Drawing. GraphicsUnit. Pixel);
// }
/// / create a new drawing board and draw the middle drawing with the size of thumbnail
// using (System.Drawing.Image bitmap1 = new System.Drawing.Bitmap(intThumbWidth, intThumbHeight))
// {
/// / draw thumbnails
// using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap1))
// {
/// / HD, smooth
// g.InterpolationMode = System. Drawing. Drawing2D. InterpolationMode. High;
// g.SmoothingMode = System. Drawing. Drawing2D. SmoothingMode. HighQuality;
// g.Clear(Color.Black);
// int lwidth = (smallWidth - intThumbWidth) / 2;
)
页:
[1]