C#压缩文件为zip格式
需要ICSharpCode.SharpZipLib.dll，网上下载的到。
代码是从网上找来的：
1 public class ZipClass
2 {
3 #region 加压
4 /// <summary>
5 /// 功能：压缩文件（暂时只压缩文件夹下一级目录中的文件，文件夹及其子级被忽略）
6 /// </summary>
7 /// <param name="dirPath"> 被压缩的文件夹夹路径 </param>
8 /// <param name="zipFilePath"> 生成压缩文件的路径，为空则默认与被压缩文件夹同一级目录，名称为：文件夹名 +.zip</param>
9 /// <param name="err"> 出错信息</param>
10 /// <returns> 是否压缩成功 </returns>
11 static public bool ZipFile( string dirPath, string zipFilePath, out string err)
12 {
13 err = "";
14 if (dirPath == string .Empty)
15 {
16 err = "要压缩的文件夹不能为空！ ";
17 return false ;
18 }
19 if (!Directory .Exists(dirPath))
20 {
21 err = "要压缩的文件夹不存在！ ";
22 return false ;
23 }
24 //压缩文件名为空时使用文件夹名＋ zip
25 if (zipFilePath == string .Empty)
26 {
27 if (dirPath.EndsWith("\\" ))
28 {
29 dirPath = dirPath.Substring(0, dirPath.Length - 1);
30 }
31 zipFilePath = dirPath + ".zip";
32 }
33
34 try
35 {
36 string[] filenames = Directory .GetFiles(dirPath);
37 using (ZipOutputStream s = new ZipOutputStream(File .Create(zipFilePath)))
38 {
39 s.SetLevel(9);
40 byte[] buffer = new byte[4096];
41 foreach (string file in filenames)
42 {
43 ZipEntry entry = new ZipEntry( Path.GetFileName(file));
44 entry.DateTime = DateTime.Now;
45 s.PutNextEntry(entry);
46 using (FileStream fs = File.OpenRead(file))
47 {
48 int sourceBytes;
49 do
50 {
51 sourceBytes = fs.Read(buffer, 0, buffer.Length);
52 s.Write(buffer, 0, sourceBytes);
53 } while (sourceBytes > 0);
54 }
55 }
56 s.Finish();
57 s.Close();
58 }
59 }
60 catch (Exception ex)
61 {
62 err = ex.Message;
63 return false ;
64 }
65 return true ;
66 }
67
68 #endregion
69
70 #region 解压方法
71 /// <summary>
72 /// 功能：解压 zip格式的文件。
73 /// </summary>
74 /// <param name="zipFilePath"> 压缩文件路径 </param>
75 /// <param name="unZipDir"> 解压文件存放路径 ,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹 </param>
76 /// <param name="err"> 出错信息</param>
77 /// <returns> 解压是否成功 </returns>
78 static public bool UnZipFile( string zipFilePath, string unZipDir, out string err)
79 {
80 err = "";
81 if (zipFilePath == string .Empty)
82 {
83 err = "压缩文件不能为空！";
84 return false ;
85 }
86 if (!File .Exists(zipFilePath))
87 {
88 err = "压缩文件不存在！";
89 return false ;
90 }
91 //解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹
92 if (unZipDir == string .Empty)
93 unZipDir = zipFilePath.Replace( Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));
94 if (!unZipDir.EndsWith("\\" ))
95 unZipDir += "\\";
96 if (!Directory .Exists(unZipDir))
97 Directory.CreateDirectory(unZipDir);
98
99 try
100 {
101 using (ZipInputStream s = new ZipInputStream(File .OpenRead(zipFilePath)))
102 {
103
104 ZipEntry theEntry;
105 while ((theEntry = s.GetNextEntry()) != null)
106 {
107 string directoryName = Path .GetDirectoryName(theEntry.Name);
108 string fileName = Path .GetFileName(theEntry.Name);
109 if (directoryName.Length > 0)
110 {
111 Directory.CreateDirectory(unZipDir + directoryName);
112 }
113 if (!directoryName.EndsWith("\\"))
114 directoryName += "\\";
115 if (fileName != String .Empty)
116 {
117 using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
118 {
119
120 int size = 2048;
121 byte[] data = new byte[2048];
122 while (true )
123 {
124 size = s.Read(data, 0, data.Length);
125 if (size > 0)
126 {
127 streamWriter.Write(data, 0, size);
128 }
129 else
130 {
131 break;
132 }
133 }
134 }
135 }
136 } //while
137 }
138 }
139 catch (Exception ex)
140 {
141 err = ex.Message;
142 return false ;
143 }
144 return true ;
145 } //解压结束
146 #endregion
147 }