if(fileupload.PostedFile!=null)

{

//addto为要添加的属性，aboutfile为文件说明

string nam = fileupload.PostedFile.FileName ;

//取得文件名(抱括路径)里最后一个"."的索引

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

//取得文件扩展名

string newext =nam.Substring(i);

//这里我自动根据日期和文件大小不同为文件命名,确保文件名不重复

DateTime now = DateTime.Now;

string newname=now.DayOfYear.ToString()+fileupload.PostedFile.ContentLength.ToString();

//保存文件到你所要的目录,这里是IIS根目录下的upload目录.你可以改变.

//注意: 我这里用Server.MapPath()取当前文件的相对目录.在asp.net里"/"必须用"//"代替，把"https://upload.ynpxrz.com/upload//"改成"//upload//"就成了取当前文件的绝对目录了

fileupload.PostedFile.SaveAs(Server.MapPath("https://upload.ynpxrz.com/upload//"+newname+newext));

//得到这个文件的相关属性:文件名,文件类型,文件大小

//fname.Text=myFile.PostedFile.FileName;

//fenc.Text=myFile.PostedFile.ContentType ;

//fsize.Text=myFile.PostedFile.ContentLength.ToString();

//下面是生成缩略图

System.Drawing.Image image,aNewImage;

int width,height,newwidth,newheight;

image=System.Drawing.Image.FromFile(Server.MapPath("https://upload.ynpxrz.com/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("https://upload.ynpxrz.com/upload//"+"small_"+newname+newext));

image.Dispose();

//生成缩略图 生成并保存完毕，保存名是在原图名前加了一个small_。

pic="https://upload.ynpxrz.com/upload/"+newname.ToString()+newext.ToString();

smallpic="https://upload.ynpxrz.com/upload/small_"+newname.ToString()+newext.ToString();

更多信息请查看IT技术专栏