本文实例讲述了C#实现压缩和解压缩的方法。分享给大家供大家参考，具体如下：
使用ICSharpCode.SharpZipLib.dll来压缩/解压（压缩效率比GZip要高一点）
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public static class ZipUtil{ /// <summary> /// 压缩 /// </summary> /// <param name="param"></param> /// <returns></returns> public static string Compress(string param) { byte[] data = System.Text.Encoding.UTF8.GetBytes(param); //byte[] data = Convert.FromBase64String(param); MemoryStream ms = new MemoryStream(); Stream stream = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms); try { stream.Write(data, 0, data.Length); } finally { stream.Close(); ms.Close(); } return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// 解压 /// </summary> /// <param name="param"></param> /// <returns></returns> public static string Decompress(string param) { string commonString = ""; byte[] buffer = Convert.FromBase64String(param); MemoryStream ms = new MemoryStream(buffer); Stream sm = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(ms); //这里要指明要读入的格式，要不就有乱码 StreamReader reader = new StreamReader(sm, System.Text.Encoding.UTF8); try { commonString = reader.ReadToEnd(); } finally { sm.Close(); ms.Close(); } return commonString; }} |
使用GZip来压缩/解压缩（字符串）
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public static class GZipUtil{ public static string Zip(string value) { //Transform string into byte[] byte[] byteArray = new byte[value.Length]; int indexBA = 0; foreach (char item in value.ToCharArray()) { byteArray[indexBA++] = (byte)item; } //Prepare for compress System.IO.MemoryStream ms = new System.IO.MemoryStream(); System.IO.Compression.GZipStream sw = new System.IO.Compression.GZipStream(ms, System.IO.Compression.CompressionMode.Compress); //Compress sw.Write(byteArray, 0, byteArray.Length); //Close, DO NOT FLUSH cause bytes will go missing... sw.Close(); //Transform byte[] zip data to string byteArray = ms.ToArray(); System.Text.StringBuilder sB = new System.Text.StringBuilder(byteArray.Length); foreach (byte item in byteArray) { sB.Append((char)item); } ms.Close(); sw.Dispose(); ms.Dispose(); return sB.ToString(); } public static string UnZip(string value) { //Transform string into byte[] byte[] byteArray = new byte[value.Length]; int indexBA = 0; foreach (char item in value.ToCharArray()) { byteArray[indexBA++] = (byte)item; } //Prepare for decompress System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArray); System.IO.Compression.GZipStream sr = new System.IO.Compression.GZipStream(ms, System.IO.Compression.CompressionMode.Decompress); //Reset variable to collect uncompressed result byteArray = new byte[byteArray.Length]; //Decompress int rByte = sr.Read(byteArray, 0, byteArray.Length); //Transform byte[] unzip data to string System.Text.StringBuilder sB = new System.Text.StringBuilder(rByte); //Read the number of bytes GZipStream red and do not a for each bytes in //resultByteArray; for (int i = 0; i < rByte; i++) { sB.Append((char)byteArray[i]); } sr.Close(); ms.Close(); sr.Dispose(); ms.Dispose(); return sB.ToString(); }} |
希望本文所述对大家C#程序设计有所帮助。
