c# Bitmap byte[] Stream 文件相互转换

1. //byte[] 转图片
2. publicstatic Bitmap BytesToBitmap(byte[] Bytes)
3. {
4. MemoryStream stream = null;
5. try
6. {
7. stream = new MemoryStream(Bytes);
8. returnnew Bitmap((Image)new Bitmap(stream));
9. }
10. catch (ArgumentNullException ex)
11. {
12. throw ex;
13. }
14. catch (ArgumentException ex)
15. {
16. throw ex;
17. }
18. finally
19. {
20. stream.Close();
21. }
22. }
23. //图片转byte[]
24. publicstaticbyte[] BitmapToBytes(Bitmap Bitmap)
25. {
26. MemoryStream ms = null;
27. try
28. {
29. ms = new MemoryStream();
30. Bitmap.Save(ms, Bitmap.RawFormat);
31. byte[] byteImage = new Byte[ms.Length];
32. byteImage = ms.ToArray();
33. return byteImage;
34. }
35. catch (ArgumentNullException ex)
36. {
37. throw ex;
38. }
39. finally
40. {
41. ms.Close();
42. }
43. }
44. }
45. =====================
46. * Stream 和 byte[] 之间的转换
47. * - - - - - - - - - - - - - - - - - - - - - - - */
48. /// <summary>
49. /// 将 Stream 转成 byte[]
50. /// </summary>
51. publicbyte[] StreamToBytes(Stream stream)
52. {
53. byte[] bytes = newbyte[stream.Length];
54. stream.Read(bytes, 0, bytes.Length);
55. // 设置当前流的位置为流的开始
56. stream.Seek(0, SeekOrigin.Begin);
57. return bytes;
58. }
59. /// <summary>
60. /// 将 byte[] 转成 Stream
61. /// </summary>
62. public Stream BytesToStream(byte[] bytes)
63. {
64. Stream stream = new MemoryStream(bytes);
65. return stream;
66. }
67. /* - - - - - - - - - - - - - - - - - - - - - - - -
68. * Stream 和 文件之间的转换
69. * - - - - - - - - - - - - - - - - - - - - - - - */
70. /// <summary>
71. /// 将 Stream 写入文件
72. /// </summary>
73. publicvoid StreamToFile(Stream stream,string fileName)
74. {
75. // 把 Stream 转换成 byte[]
76. byte[] bytes = newbyte[stream.Length];
77. stream.Read(bytes, 0, bytes.Length);
78. // 设置当前流的位置为流的开始
79. stream.Seek(0, SeekOrigin.Begin);
80. // 把 byte[] 写入文件
81. FileStream fs = new FileStream(fileName, FileMode.Create);
82. BinaryWriter bw = new BinaryWriter(fs);
83. bw.Write(bytes);
84. bw.Close();
85. fs.Close();
86. }
87. /// <summary>
88. /// 从文件读取 Stream
89. /// </summary>
90. public Stream FileToStream(string fileName)
91. {
92. // 打开文件
93. FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
94. // 读取文件的 byte[]
95. byte[] bytes = newbyte[fileStream.Length];
96. fileStream.Read(bytes, 0, bytes.Length);
97. fileStream.Close();
98. // 把 byte[] 转换成 Stream
99. Stream stream = new MemoryStream(bytes);
100. return stream;
101. }