Build thumbnail program written by C #

if (fileupload. Postedfile!=null)

{

AddTo for the property to be added, Aboutfile for the file description

String nam = FileUpload. Postedfile.filename;

Gets the last "." in the filename (enclosing path). The index

int i= Nam. LastIndexOf (".");

Get file name extension

String Newext =nam. Substring (i);

Here I automatically name the file according to the date and file size to ensure that the filename is not duplicated

DateTime now = DateTime.Now;

String Newname=now. Dayofyear.tostring () +fileupload. PostedFile.ContentLength.ToString ();

Save the file to the directory you want, this is the upload directory under the IIS root directory. You can change.

Note: I use Server.MapPath () to take the relative directory of the current file. In asp.net "/" must use "//" instead, "upload//" to "//upload//" to take the current file absolute directory

FileUpload. Postedfile.saveas (Server.MapPath ("upload//" +newname+newext));

Get the related attributes of this file: file name, file type, file size

FName. Text=myfile.postedfile.filename;

Fenc. Text=myfile.postedfile.contenttype;

Fsize. Text=myfile.postedfile.contentlength.tostring ();

Here is the build thumbnail

System.Drawing.Image Image,anewimage;

int width,height,newwidth,newheight;

Image=system.drawing.image.fromfile (Server.MapPath) ("upload/" +newname. ToString () +newext. ToString ()));

System.Drawing.Image.GetThumbnailImageAbort callb =new System.Drawing.Image.GetThumbnailImageAbort ( Thumbnailcallback);

Width=image. Width;

Height=image. Height;

if (firstpageshow. selectedvalue.tostring () = = "1" &&fenlei. selectedvalue.tostring () = = "5")

{

newwidth=203;newheight=86;

Newheight=height*newwidth/width;

}

else if (Isweekman. selectedvalue.tostring () = = "1")

{

newwidth=171;newheight=111;

Newheight=height*newwidth/width;

}

else if (firstpageshow. selectedvalue.tostring () = = "1" &&fenlei. selectedvalue.tostring () = = "3")

{

newwidth=171;newheight=111;

Newheight=height*newwidth/width;

}

Else

{

newwidth=62;newheight=80;

Newheight=height*newwidth/width;

}

Anewimage=image. Getthumbnailimage (Newwidth,newheight,callb,new system.intptr ());

Anewimage.save (Server.MapPath ("upload//" + "Small_" +newname+newext));

Image. Dispose ();

Build and save the thumbnail, save name is added a Small_ before the original name.

Pic= "upload/" +newname. ToString () +newext. ToString ();

Smallpic= "Upload/small_" +newname. ToString () +newext. ToString ();