asp.net生成缩略图通用函数(支持多种生成方式) 支持图片裁减

3、aram>       ///缩略图高度       ///生成缩略图的方式          publicstaticvoidMakeThumbnail(stringoriginalImagePath,stringthumbnailPath,intwidth,intheight,stringmode)       {           ImageoriginalImage=Image.FromFile(originalImage

4、Path);                      inttowidth=width;           inttoheight=height;                  intx=0;           inty=0;           intow=originalImage.Width;           intoh=originalImage.Height;                  switch(mode)           {                      case"HW"://指定高宽

5、缩放（可能变形）                                  break;               case"W"://指定宽，高按比例                                      toheight=originalImage.Height*width/originalImage.Width;                   break;               case"H"://指定高，宽按比例                   towidth=originalImag

6、e.Width*height/originalImage.Height;                                      break;                      case"Cut"://指定高宽裁减（不变形）                                  if((double)originalImage.Width/(double)originalImage.Height>(double)towidth/(double)toheight)                   {

7、                       oh=originalImage.Height;                       ow=originalImage.Height*towidth/toheight;                       y=0;                       x=(originalImage.Width-ow)/2;                   }                   else                   {                   

8、    ow=originalImage.Width;                       oh=originalImage.Width*height/towidth;                       x=0;                       y=(originalImage.Height-oh)/2;                   }                   break;                                  default:                 

9、  break;           }                         //新建一个bmp图片           Imagebitmap=newSystem.Drawing