问题描述

在C#中FileStream.Read循环读取时其参数offest如何设置？

使用FileStream.Read 循环读取一个文件
While(true)
{
byte[] buffer=new byte[1024];
Fs.Read(buffer,0,buffer.length);
........
}
在循环的时候，按照代码所写不应该是每次都从0的位置开始读取吗？但是实际操作中，每次都是从=+buffer.length开始读取。怎么实现的？

解决方案

参考MSDNFileStream.Read 方法

            // Read the source file into a byte array.
            byte[] bytes = new byte[fsSource.Length];
            int numBytesToRead = (int)fsSource.Length;
            int numBytesRead = 0;
            while (numBytesToRead > 0)
            {
                // Read may return anything from 0 to numBytesToRead.
                int n = fsSource.Read(bytes, numBytesRead, numBytesToRead);

                // Break when the end of the file is reached.
                if (n == 0)
                    break;

                numBytesRead += n;
                numBytesToRead -= n;
            }
             numBytesToRead = bytes.Length;