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我想上传多个图像并将其保存到我的应用程序中的一个文件夹中,并将相同图像的缩略图保存到名为“缩略图”的文件夹中。我已成功上传图像并将其保存在图像文件夹中。我也想保存它的缩略图。
<form action="" method="post" enctype="multipart/form-data">
@Html.Label("Select the property : ");
@Html.DropDownList("Address", new SelectList(ViewBag.Address as System.Collections.IEnumerable), "---Select---",new { id = "add"})
<label for="file">Filename:</label>
<input type="file" name="files" id="file" multiple="true"/>
<input type="submit" />
public class HomeController : Controller
{
PropertyAssessmentSystemEntities db = new PropertyAssessmentSystemEntities();
public ActionResult Index()
{
var q = from pi in db.PropertyInfoes
select pi.Full_Address;
ViewBag.Address = q.ToList();
return View();
}
[HttpPost]
public ActionResult Index(HttpPostedFileBase[] files,FormCollection c)
{
int no = 0,no1 =0;
string path = Path.Combine(Server.MapPath("~/Images"), c["Address"].Replace(' ', '_'));
string fn = "", fn1 = "";
if (!Directory.Exists(path))
Directory.CreateDirectory(path);
else
no = Directory.GetFiles(path).Length;
foreach (var file in files)
{
string fname = "img_" + no++ + file.FileName.Substring(file.FileName.LastIndexOf('.'));
string fname1 = "img_" + no1++ + file.FileName.Substring(file.FileName.LastIndexOf('.'));
fname1 = Path.Combine("Thumbnail", fname1);
fn1 = Path.Combine(path, fname1);
if (!Directory.Exists(fn1))
Directory.CreateDirectory(fn1);
else
no = Directory.GetFiles(fn1).Length;
fn = Path.Combine(path, fname);
file.SaveAs(fn);
Stream strm = new FileStream(fn, FileMode.OpenOrCreate);
GenerateThumbnails(0.05, strm, fn1);
}
return RedirectToAction("Index");
}
private void GenerateThumbnails(double scaleFactor, Stream sourcePath, string targetPath)
{
using (var image = System.Drawing.Image.FromStream(sourcePath))
{
var newWidth = (int)(image.Width * scaleFactor);
var newHeight = (int)(image.Height * scaleFactor);
var thumbnailImg = new Bitmap(newWidth, newHeight);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
thumbGraph.DrawImage(image, imageRectangle);
thumbnailImg.Save(targetPath,image.RawFormat);
} }}
<小时/>
执行此操作时,thumbnailImg.Save(targetPath,image.RawFormat); 中会发生错误
GDI+ 中发生一般错误。任何人都可以帮我解决这个问题吗?
最佳答案
我有另一种在上传时从图像创建缩略图的方法,如下所示:
在您的 using 命名空间中添加以下指令:
using System.Drawing;
using System.Drawing.Imaging;
在 Controller 操作中添加以下代码以创建缩略图
using (var image = Image.FromStream(file.InputStream, true, true)) /* Creates Image from specified data stream */
{
using (var thumb = image.GetThumbnailImage(
36, /* width*/
30, /* height*/
() => false,
IntPtr.Zero))
{
var jpgInfo = ImageCodecInfo.GetImageEncoders().Where(codecInfo => codecInfo.MimeType == "image/png").First(); /* Returns array of image encoder objects built into GDI+ */
using (var encParams = new EncoderParameters(1))
{
var appDataThumbnailPath = Server.MapPath("~/Uploads/Thumbnail/" + User.id);
if (!Directory.Exists(appDataThumbnailPath))
{
Directory.CreateDirectory(appDataThumbnailPath);
}
string outputPath = Path.Combine(appDataThumbnailPath, fileName);
long quality = 100;
encParams.Param[0] = new EncoderParameter(Encoder.Quality, quality);
thumb.Save(outputPath, jpgInfo, encParams);
}
}
}
这里的文件是具有输入图像的HttpPostedFileBase对象,outputPath是缩略图的目标文件。通过以下过程,您将获得缩略图。
关于asp.net-mvc - 上传图像的缩略图创建,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16936421/
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