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);
}
}
C# FileStream设置了FileAccess.ReadWrite, FileShare.ReadWrite依然报“流不可读”或者“流不可写”
原文：https://www.cnblogs.com/luludongxu/p/14821476.html