GZipStream Constructor (Stream, CompressionLevel, Boolean)
Initializes a new instance of the GZipStream class by using the specified stream and compression level, and optionally leaves the stream open.
Assembly: System (in System.dll)
Parameters
- stream
-
Type:
System.IO.Stream
The stream to write the compressed data to.
- compressionLevel
-
Type:
System.IO.Compression.CompressionLevel
One of the enumeration values that indicates whether to emphasize speed or compression efficiency when compressing the stream.
- leaveOpen
-
Type:
System.Boolean
true to leave the stream object open after disposing the GZipStream object; otherwise, false.
| Exception | Condition |
|---|---|
| ArgumentNullException | stream is null. |
| ArgumentException | The stream does not support write operations such as compression. (The CanWrite property on the stream object is false.) |
You use this constructor when you want to specify whether compression efficiency or speed is more important for an instance of the GZipStream class, and whether to leave the stream object open after disposing the GZipStream object.
This constructor overload uses the compression mode Compress. To set the compression mode to another value, use the GZipStream(Stream, CompressionMode) or GZipStream(Stream, CompressionMode, Boolean) overload.
The following example shows how to set the compression level when creating a GZipStream object and how to leave the stream open.
using System; using System.Collections.Generic; using System.IO; using System.IO.Compression; namespace ConsoleApplication { class Program { static void Main(string[] args) { string directoryPath = @"c:\users\public\reports"; DirectoryInfo directorySelected = new DirectoryInfo(directoryPath); foreach (FileInfo fileToCompress in directorySelected.EnumerateFiles()) { Compress(fileToCompress); } } public static void Compress(FileInfo fileToCompress) { using (FileStream originalFileStream = fileToCompress.OpenRead()) { if ((File.GetAttributes(fileToCompress.FullName) & FileAttributes.Hidden) != FileAttributes.Hidden & fileToCompress.Extension != ".gz") { using (FileStream compressedFileStream = File.Create(fileToCompress.FullName + ".gz")) { using (GZipStream compressionStream = new GZipStream(compressedFileStream, CompressionLevel.Fastest, true)) { originalFileStream.CopyTo(compressionStream); } Console.WriteLine(string.Format("file compressed to {0} bytes", compressedFileStream.Length)); } } } } } }
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1