CSkin博客

标题: parallel.for并行计算文件MD5卡死，求支援 [打印本页]

作者: zhy934453950 时间: 2018-5-11 15:51
标题: parallel.for并行计算文件MD5卡死，求支援
本帖最后由 zhy934453950 于 2018-5-11 15:52 编辑

问题源码：//我怀疑Parallel.For(0, inputStream.Length, ever => {此处进入了死循环                               FileStream inputStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
            MD5 md5 = new MD5CryptoServiceProvider();
            int bufferChunkSize = 1024 * 1024;//自定义缓冲区大小1MB即1024K
            byte[] inputBuffer = new byte[bufferChunkSize];
            int readLength = 0;//每次读取长度
            byte[] outputBuffer = new byte[bufferChunkSize];
            Parallel.For(0, inputStream.Length, ever => {
                  md5.TransformBlock(inputBuffer, 0, readLength, outputBuffer, 0);//计算MD5
            });
            md5.TransformFinalBlock(inputBuffer, 0, 0);//完成最后计算，必须调用(由于上一部循环已经完成所有运算，所以调用此方法时后面的两个参数都为0)
            byte[] bytes = md5.Hash;
            string md5Value = string.Empty;
            if (bytes != null)
            {
                  StringBuilder str = new StringBuilder();
                  Parallel.For(0, bytes.Length,i=> {
                     str.Append(bytes.ToString("X2"));
                  });
                  md5Value = str.ToString();
            }
            md5.Clear();
            inputStream.Close();
            return md5Value;

欢迎光临 CSkin博客 (http://bbs.cskin.net/)