c# - GZip解压得到空白文件

Question

鉴于下面的代码，为什么解压不起作用？“NewFile2.txt”应该有原始的解压缩文本，但文件只是空白。

ioTests.CompressFile(@"c:\newfile.txt", @"c:\newfile.txt.gz");
ioTests.DecompressFile(@"c:\newfile.txt.gz", @"c:\newfile2.txt");

public void CompressFile(string inFileName, string outFileName)
{
    FileStream inFile = new FileStream(inFileName, FileMode.Open);
    FileStream outFile = new FileStream(outFileName, FileMode.Create);

    GZipStream compStream = new GZipStream(outFile, CompressionMode.Compress);

    int theByte = inFile.ReadByte();

    while (theByte != -1)
    {
        compStream.WriteByte((byte)theByte);
        theByte = inFile.ReadByte();
    }

    compStream.Close();
}

public void DecompressFile(string inFileName, string outFileName)
{
    FileStream inFile = new FileStream(inFileName, FileMode.Open);
    FileStream outFile = new FileStream(outFileName, FileMode.CreateNew);

    GZipStream compStream = new GZipStream(inFile, CompressionMode.Decompress);

    int theByte = compStream.ReadByte();

    while (theByte != -1)
    {
        outFile.WriteByte((byte)theByte);

        theByte = compStream.ReadByte();
    }

    compStream.Close();
}

Answer 1

outFile.Flush(); // after your loop

Answer 2

由于您使用的流实现了IDisposable接口，因此您应该Dispose()/Close()您的类，或使用该using语句自动执行此操作：

    using (FileStream inFile = new FileStream(inFileName, FileMode.Open))
    using (FileStream outFile = new FileStream(outFileName, FileMode.Create))

    using (GZipStream compStream = new GZipStream(outFile, CompressionMode.Compress)) {

        int theByte = inFile.ReadByte();
        // ... Rest of your code

    }

这大致翻译为：

    try {
       FileStream inFile = new FileStream(inFileName, FileMode.Open);
       FileStream outFile = new FileStream(outFileName, FileMode.Create);
       GZipStream compStream = new GZipStream(outFile, CompressionMode.Compress);

        int theByte = inFile.ReadByte();
        // ... Rest of your code

    } finally {
        if (inFile != null) inFile.Dispose();
        if (outFile != null) outFile.Dispose();
        if (compStream != null) compStream.Dispose();
    }

Answer 3

我更喜欢

outFile.Close() 

因为这会刷新流并调用 Dispose 方法，从而释放分配的资源。