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DeflateStream Constructor (Stream, CompressionLevel)

.NET Framework 4.6 and 4.5

Initializes a new instance of the DeflateStream class by using the specified stream and compression level.

Namespace:  System.IO.Compression
Assembly:  System (in System.dll)

public DeflateStream(
	Stream stream,
	CompressionLevel compressionLevel
)

Parameters

stream
Type: System.IO.Stream

The stream to compress.

compressionLevel
Type: System.IO.Compression.CompressionLevel

One of the enumeration values that indicates whether to emphasize speed or compression efficiency when compressing the stream.

ExceptionCondition
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 DeflateStream class.

This constructor overload uses the compression mode Compress. To set the compression mode to another value, use the DeflateStream(Stream, CompressionMode) or DeflateStream(Stream, CompressionMode, Boolean) overload.

The following example shows how to set the compression level when creating a DeflateStream object.

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 != ".cmp")
                {
                    using (FileStream compressedFileStream = File.Create(fileToCompress.FullName + ".cmp"))
                    {
                        using (DeflateStream compressionStream = new DeflateStream(compressedFileStream, CompressionLevel.Fastest))
                        {
                            originalFileStream.CopyTo(compressionStream);
                        }
                    }
                }
            }
        }
    }
}

.NET Framework

Supported in: 4.6, 4.5

Supported in: Windows Phone 8.1
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