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ASP.NET Image Upload and Resize

/ Published in: C#
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Image Upload and Resize

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  1. public void ResizeFromStream(string ImageSavePath, int MaxSideSize, Stream Buffer) 
  2. { 
  3. int intNewWidth; 
  4. int intNewHeight; 
  5. Image imgInput = Image.FromStream(Buffer); 
  6.  
  7. //Determine image format 
  8. ImageFormat fmtImageFormat = imgInput.RawFormat; 
  9.  
  10. //get image original width and height 
  11. int intOldWidth = imgInput.Width; 
  12. int intOldHeight = imgInput.Height; 
  13.  
  14. //determine if landscape or portrait 
  15. int intMaxSide; 
  16.  
  17. if (intOldWidth >= intOldHeight) 
  18. { 
  19. intMaxSide = intOldWidth; 
  20. } 
  21. else 
  22. { 
  23. intMaxSide = intOldHeight; 
  24. } 
  25.  
  26.  
  27. if (intMaxSide > MaxSideSize) 
  28. { 
  29. //set new width and height	
  30. double dblCoef = MaxSideSize / (double)intMaxSide; 
  31. i ntNewWidth = Convert.ToInt32(dblCoef * intOldWidth); 
  32. intNewHeight = Convert.ToInt32(dblCoef * intOldHeight); 
  33. } 
  34. else 
  35. { 
  36. intNewWidth = intOldWidth; 
  37. intNewHeight = intOldHeight; 
  38. } 
  39. //create new bitmap 
  40. Bitmap bmpResized = new Bitmap(imgInput, intNewWidth, intNewHeight); 
  41.  
  42. //save bitmap to disk 
  43. bmpResized.Save(ImageSavePath, fmtImageFormat); 
  44.  
  45. //release used resources 
  46. imgInput.Dispose(); 
  47. bmpResized.Dispose(); 
  48. Buffer.Close(); 
  49. }

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