這篇文章給大家分享的是有關(guān)asp.net如何實現(xiàn)生成縮略圖及加水印的內(nèi)容。小編覺得挺實用的,因此分享給大家做個參考。一起跟隨小編過來看看吧。

using System.IO;
using System.Drawing.Imaging;
private void Button1_ServerClick(object sender, System.EventArgs e)
{
Graphics g=null;
System.Drawing.Image upimage=null;
System.Drawing.Image thumimg=null;
System.Drawing.Image simage=null;
Bitmap outputfile=null;
try
{
string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper();
string filename = DateTime.Now.ToString("yyyyMMddhhmmss");
string smallpath = Server.MapPath(".")+"/smallimg/";
string bigpath = Server.MapPath(".")+"/bigimg/";
int width,height,newwidth,newheight;
System.Drawing.Image.GetThumbnailImageAbort callb =new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
if(!Directory.Exists(smallpath))
Directory.CreateDirectory(smallpath);
if(!Directory.Exists(bigpath))
Directory.CreateDirectory(bigpath);
Stream upimgfile = File1.PostedFile.InputStream;
string simagefile = Server.MapPath("a8logo.jpg"); //要加水印的文件
simage=System.Drawing.Image.FromFile(simagefile);
upimage= System.Drawing.Image.FromStream(upimgfile); //上傳的圖片
width = upimage.Width;
height = upimage.Height;
if(width>height)
{
newwidth=200;
newheight =(int)((double)height/(double)width * (double)newwidth);
} else
{
newheight=200;
newwidth=(int)((double)width/(double)height * (double)newheight);
}
thumimg = upimage.GetThumbnailImage(newwidth,newheight,callb,IntPtr.Zero);
outputfile=new Bitmap(upimage);
g=Graphics.FromImage(outputfile);
g.DrawImage(simage,new Rectangle(upimage.Width-simage.Width,upimage.Height-simage.Height,upimage.Width,upimage.Height),0,0,upimage.Width,upimage.Height,GraphicsUnit.Pixel);
string newpath = bigpath + filename + extension; //原始圖路徑
string thumpath = smallpath + filename + extension; //縮略圖路徑
outputfile.Save(newpath);
thumimg.Save(thumpath);
outputfile.Dispose();
}
catch(Exception ex)
{
throw ex;
}
finally
{
if(g!=null)
g.Dispose();
if(thumimg!=null)
thumimg.Dispose();
if(upimage!=null)
upimage.Dispose();
if(simage!=null)
simage.Dispose();
}
}
public bool ThumbnailCallback()
{
return false;
}感謝各位的閱讀!關(guān)于asp.net如何實現(xiàn)生成縮略圖及加水印就分享到這里了,希望以上內(nèi)容可以對大家有一定的幫助,讓大家可以學(xué)到更多知識。如果覺得文章不錯,可以把它分享出去讓更多的人看到吧!
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