如果你直接读就会报错
IOException: Sharing violation on path *****
因为文件已经被占用
所以你需要用 FileShare.ReadWrite 打开它
FileStream stream = File.Open("myfile.xlsx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
注意要自行排除 ~$ 文件
然后将 FileStream转成bytes就可以用了
参考代码
/*----------------------读取被打开的Excel文件---------------------*/ FileStream fileStream = File.Open(info.readPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); byte[] buffer = new byte[fileStream.Length]; fileStream.Read(buffer, 0, buffer.Length); fileStream.Seek(0, SeekOrigin.Begin); return buffer; /*-------------------------------------------------------------*/
原文：https://www.cnblogs.com/sanyejun/p/15141068.html