今天遇见一个诡异的事情,我用FileStream操作一个文件的时候,明明设置了FileAccess.ReadWrite, FileShare.ReadWrite了,但是依然报错,说是“流不可写”
后来仔细一研究才发现,原来是我用的不对,我是在FileStream里面先用了BinaryReader,然后又用了BinaryWriter,貌似不能这么用,一个FileStream只能用做一次操作
static void AAA() { using (FileStream fs = new FileStream("E:\test.txt", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) { using (BinaryReader br = new BinaryReader(fs)) { Console.WriteLine(br.ReadByte()); br.Dispose(); } using (BinaryWriter bw = new BinaryWriter(fs)) { //一个FileStream只能进行一次Binary操作,第二次就会报错 } } }
不知道为什么using包裹着BinaryReader也不行,我还想着重用一个流呢,估计是没彻底释放之类的,想要不报错,就需要给BinaryWriter再申请一次FileStream
static void AAA() { using (FileStream fs = new FileStream("E:\test.txt", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) { using (BinaryReader br = new BinaryReader(fs)) { Console.WriteLine(br.ReadByte()); br.Dispose(); } } using (FileStream fs = new FileStream("E:\test.txt", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) { using (BinaryWriter bw = new BinaryWriter(fs)) { //每个Binary操作都申请一次FileStream就不会报错了 } } }
或者干脆直接用FileStream自己操作算了
static void AAA() { using (FileStream fs = new FileStream("E:\test.txt", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) { Console.WriteLine(fs.ReadByte()); fs.Seek(0,SeekOrigin.Begin); fs.WriteByte(0xFF); } }