图片缩放方法-优快云博客

本文提供三种图片缩放方法：直接指定宽高缩放、按宽度比例缩放并自动计算高度，以及按高度比例缩放并自动计算宽度。所有方法均通过C#实现，并附有详细的参数说明。

1. class ExampleOfLegalsoft 2. { 3. //************************************************************// 4. //下面给出三个简单的方法，后面两个方法是扩展，估计有时用得着 5. //************************************************************// 6. /// <summary> 7. /// 缩小图片 8. /// </summary> 9. /// <param name="strOldPic">源图文件名(包括路径)</param> 10. /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param> 11. /// <param name="intWidth">缩小至宽度</param> 12. /// <param name="intHeight">缩小至高度</param> 13. public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight) 14. { 15. System.Drawing.Bitmap objPic, objNewPic; 16. try 17. { 18. objPic = new System.Drawing.Bitmap(strOldPic); 19. objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight); 20. objNewPic.Save(strNewPic); 21. } 22. catch (Exception exp) { throw exp; } 23. finally 24. { 25. objPic = null; 26. objNewPic = null; 27. } 28. } 29. /// <summary> 30. /// 按比例缩小图片，自动计算高度 31. /// </summary> 32. /// <param name="strOldPic">源图文件名(包括路径)</param> 33. /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param> 34. /// <param name="intWidth">缩小至宽度</param> 35. public void SmallPic(string strOldPic, string strNewPic, int intWidth) 36. { 37. System.Drawing.Bitmap objPic, objNewPic; 38. try 39. { 40. objPic = new System.Drawing.Bitmap(strOldPic); 41. int intHeight = (intWidth / objPic.Width) * objPic.Height; 42. objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight); 43. objNewPic.Save(strNewPic); 44. } 45. catch (Exception exp) { throw exp; } 46. finally 47. { 48. objPic = null; 49. objNewPic = null; 50. } 51. } 52. /// <summary> 53. /// 按比例缩小图片，自动计算宽度 54. /// </summary> 55. /// <param name="strOldPic">源图文件名(包括路径)</param> 56. /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param> 57. /// <param name="intHeight">缩小至高度</param> 58. public void SmallPic(string strOldPic, string strNewPic, int intHeight) 59. { 60. System.Drawing.Bitmap objPic, objNewPic; 61. try 62. { 63. objPic = new System.Drawing.Bitmap(strOldPic); 64. int intWidth = (intHeight / objPic.Height) * objPic.Width; 65. objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight); 66. objNewPic.Save(strNewPic); 67. } 68. catch (Exception exp) { throw exp; } 69. finally 70. { 71. objPic = null; 72. objNewPic = null; 73. } 74. } 75. }