执行GZipStream压缩时抛出System.OutofMemoryException

Question

我正在以胜利的形式工作.执行以下操作时出错.System.OutOfMemoryException当我尝试连续2-3次运行操作时,它显示错误.似乎.NET无法释放运行中使用的资源.我用于操作的文件非常大,大约超过500 MB.

我的示例代码如下.请帮我解决错误.

try
{
   using (FileStream target = new FileStream(strCompressedFileName, FileMode.Create, FileAccess.Write))
   using (GZipStream alg = new GZipStream(target, CompressionMode.Compress))
   {
       byte[] data = File.ReadAllBytes(strFileToBeCompressed);
       alg.Write(data, 0, data.Length);
       alg.Flush();
       data = null;
    }
}
catch (Exception ex)
{
    MessageBox.Show(ex.ToString());
}

Answer 1

替换ReadAllBytes为Stream.CopyTo

using (FileStream target = new FileStream(strCompressedFileName, FileMode.Create, FileAccess.Write))
using (GZipStream alg = new GZipStream(target, CompressionMode.Compress))
{
    using (var fileToRead = File.Open(.....))
    {
        fileToRead.CopyTo(alg);
    }
}

Answer 2

一个非常粗略的例子可能是

// destFile - FileStream for destinationFile 
// srcFile - FileStream of sourceFile
using (GZipStream gz = new GZipStream(destFile, CompressionMode.Compress))
{
     byte[] src = new byte[1024];
     int count = sourceFile.Read(src, 0, 1024);
     while (count != 0)
     {
         gz.Write(src, 0, count );
         count = sourceFile.Read(src, 0, 1024);
     }
}
// flush, close, dispose ..

所以基本上我改变你的ReadAllBytes只读取1024字节的块.