public void HiddenFilesAreReturned()
{
// Note that APIs that take EnumerationOptions do NOT find hidden files by default
DirectoryInfo testDirectory = Directory.CreateDirectory(GetTestFilePath());
FileInfo fileOne = new FileInfo(Path.Combine(testDirectory.FullName, GetTestFileName()));
// Put a period in front to make it hidden on Unix
FileInfo fileTwo = new FileInfo(Path.Combine(testDirectory.FullName, "." + GetTestFileName()));
fileOne.Create().Dispose();
fileTwo.Create().Dispose();
if (PlatformDetection.IsWindows)
{
fileTwo.Attributes = fileTwo.Attributes | FileAttributes.Hidden;
}
if (TestFiles)
{
FSAssert.EqualWhenOrdered(new string[] { fileOne.FullName, fileTwo.FullName }, GetEntries(testDirectory.FullName));
}
else
{
Assert.Empty(GetEntries(testDirectory.FullName));
}
}
public void CancelledTokenFastPath()
{
var cts = new CancellationTokenSource();
cts.Cancel();
CancellationToken cancelledToken = cts.Token;
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
FSAssert.IsCancelled(ReadAsync(fs, new byte[1], 0, 1, cancelledToken), cancelledToken);
}
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create, FileAccess.Write))
{
// before write only check
FSAssert.IsCancelled(ReadAsync(fs, new byte[1], 0, 1, cancelledToken), cancelledToken);
fs.Dispose();
// before disposed check
FSAssert.IsCancelled(ReadAsync(fs, new byte[1], 0, 1, cancelledToken), cancelledToken);
// out of bounds checking happens first
Assert.Throws <ArgumentOutOfRangeException>(() =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[2], 1, 2, cancelledToken)));
}
}
public async Task ReadAsyncBufferedCompletesSynchronously()
{
string fileName = GetTestFilePath();
using (var fs = new FileStream(fileName, FileMode.Create))
{
fs.Write(TestBuffer, 0, TestBuffer.Length);
fs.Write(TestBuffer, 0, TestBuffer.Length);
}
using (var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete, TestBuffer.Length * 2, useAsync: true))
{
byte[] buffer = new byte[TestBuffer.Length];
// prime the internal buffer
Assert.Equal(TestBuffer.Length, await ReadAsync(fs, buffer, 0, buffer.Length));
Assert.Equal(TestBuffer, buffer);
Array.Clear(buffer, 0, buffer.Length);
// read should now complete synchronously since it is serviced by the read buffer filled in the first request
Assert.Equal(TestBuffer.Length, FSAssert.CompletesSynchronously(ReadAsync(fs, buffer, 0, buffer.Length)));
Assert.Equal(TestBuffer, buffer);
}
}
public void BufferOutOfBoundsThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
// offset out of bounds
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 1, 1)));
// offset out of bounds for 0 count ReadAsync
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 2, 0)));
// offset out of bounds even for 0 length buffer
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[0], 1, 0)));
// combination offset and count out of bounds
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[2], 1, 2)));
// edges
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[0], int.MaxValue, 0)));
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[0], int.MaxValue, int.MaxValue)));
}
}
public void DirectoryWithTrailingSeparators(string trailing)
{
// When getting strings back we should retain the root path as specified for Directory.
// DirectoryInfo returns the normalized full path in all cases.
// Add the trailing separator up front for Directory as we want to validate against
// the path _with_ the separator on it. Creation doesn't care about trailing, and
// Path.Combine doesn't change the existing separators, it just adds the canonical
// separator if needed.
string root = GetTestFilePath() + (IsDirectoryInfo ? "" : trailing);
string rootFile = Path.Combine(root, GetTestFileName());
string subDirectory = Path.Combine(root, GetTestFileName());
string nestedFile = Path.Combine(subDirectory, GetTestFileName());
Directory.CreateDirectory(subDirectory);
File.Create(rootFile).Dispose();
File.Create(nestedFile).Dispose();
// Add the trailing separator if we haven't (for DI) so we can validate that we
// either retain (D) or don't retain (DI) the separators as we specified them.
// Note that some of the cases actually match canonical (one standard separator)
// so they never change.
string[] files = GetEntries(root + (IsDirectoryInfo ? trailing : ""), "*", SearchOption.AllDirectories);
FSAssert.EqualWhenOrdered(new string[] { rootFile, nestedFile }, files);
}
public void ReadAsyncDisposedThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
fs.Dispose();
Assert.Throws <ObjectDisposedException>(() =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 0, 1)));
// even for noop ReadAsync
Assert.Throws <ObjectDisposedException>(() =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 0, 0)));
// out of bounds checking happens first
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[2], 1, 2)));
// count is checked prior
AssertExtensions.Throws <ArgumentOutOfRangeException>(CountParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 0, -1)));
// offset is checked prior
AssertExtensions.Throws <ArgumentOutOfRangeException>(OffsetParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], -1, -1)));
// buffer is checked first
AssertExtensions.Throws <ArgumentNullException>(BufferParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, null, -1, -1)));
}
}
public void ReadOnlyThrows()
{
string fileName = GetTestFilePath();
using (FileStream fs = new FileStream(fileName, FileMode.Create))
{ }
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
Assert.Throws <NotSupportedException>(() =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], 0, 1)));
fs.Dispose();
// Disposed checking happens first
Assert.Throws <ObjectDisposedException>(() =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], 0, 1)));
// out of bounds checking happens first
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[2], 1, 2)));
// count is checked prior
Assert.Throws <ArgumentOutOfRangeException>("count", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], 0, -1)));
// offset is checked prior
Assert.Throws <ArgumentOutOfRangeException>("offset", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], -1, -1)));
// buffer is checked first
Assert.Throws <ArgumentNullException>("buffer", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(null, -1, -1)));
}
}
public void NullBufferThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
Assert.Throws <ArgumentNullException>("buffer", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(null, 0, 1)));
}
}
public void NullBufferThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
AssertExtensions.Throws <ArgumentNullException>(BufferParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, null, 0, 1)));
}
}
public void EnumerateDirectories_NonBreakingSpace()
{
DirectoryInfo rootDirectory = Directory.CreateDirectory(GetTestFilePath());
DirectoryInfo subDirectory1 = rootDirectory.CreateSubdirectory("\u00A0");
DirectoryInfo subDirectory2 = subDirectory1.CreateSubdirectory(GetTestFileName());
FSAssert.EqualWhenOrdered(new string[] { subDirectory1.FullName, subDirectory2.FullName }, Directory.EnumerateDirectories(rootDirectory.FullName, string.Empty, SearchOption.AllDirectories));
}
public void WriteAsyncBufferedCompletesSynchronously()
{
using (FileStream fs = new FileStream(
GetTestFilePath(), FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite | FileShare.Delete,
TestBuffer.Length * 2, useAsync: true))
{
FSAssert.CompletesSynchronously(WriteAsync(fs, new byte[TestBuffer.Length], 0, TestBuffer.Length));
}
}
[PlatformSpecific(PlatformID.Windows)] // file sharing restriction limitations on Unix
public void FileShareWithoutReadThrows()
{
string fileName = GetTestFilePath();
// Open without read sharing
using (FileStream fs = CreateFileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.Write | FileShare.Delete))
{
FSAssert.ThrowsSharingViolation(() => CreateFileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete));
}
}
public void NegativeOffsetThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
AssertExtensions.Throws <ArgumentOutOfRangeException>(OffsetParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], -1, 1)));
// buffer is checked first
AssertExtensions.Throws <ArgumentNullException>(BufferParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, null, -1, 1)));
}
}
public void NegativeOffsetThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
Assert.Throws <ArgumentOutOfRangeException>("offset", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], -1, 1)));
// buffer is checked first
Assert.Throws <ArgumentNullException>("buffer", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(null, -1, 1)));
}
}
[PlatformSpecific(XunitPlatformID.Windows)] // file sharing restriction limitations on Unix
public void FileShareWithoutDeleteThrows()
{
string fileName = GetTestFilePath();
string newFileName = GetTestFilePath();
// Create without delete sharing
using (FileStream fs = CreateFileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
{
FSAssert.ThrowsSharingViolation(() => File.Delete(fileName));
FSAssert.ThrowsSharingViolation(() => File.Move(fileName, newFileName));
}
Assert.True(File.Exists(fileName));
}
public void WriteAsyncDisposedThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
fs.Dispose();
Assert.Throws <ObjectDisposedException>(() =>
FSAssert.CompletesSynchronously(WriteAsync(fs, new byte[1], 0, 1)));
// even for noop WriteAsync
Assert.Throws <ObjectDisposedException>(() =>
FSAssert.CompletesSynchronously(WriteAsync(fs, new byte[1], 0, 0)));
// out of bounds checking happens first
Assert.Throws <ArgumentOutOfRangeException>(() =>
FSAssert.CompletesSynchronously(WriteAsync(fs, new byte[2], 1, 2)));
}
}
public void FileShareWithoutWriteThrows()
{
string fileName = GetTestFilePath();
// Open without write sharing
using (FileStream fs = CreateFileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
FSAssert.ThrowsSharingViolation(() => CreateFileStream(fileName, FileMode.Open, FileAccess.Write, FileShare.ReadWrite | FileShare.Delete));
}
// Then try the other way around
using (FileStream fs = CreateFileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite | FileShare.Delete))
{
FSAssert.ThrowsSharingViolation(() => CreateFileStream(fileName, FileMode.Open, FileAccess.Write, FileShare.None));
}
}
public void NegativeCountThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
AssertExtensions.Throws <ArgumentOutOfRangeException>("count", () =>
FSAssert.CompletesSynchronously(fs.ReadAsync(new byte[1], 0, -1)));
// offset is checked before count
AssertExtensions.Throws <ArgumentOutOfRangeException>("offset", () =>
FSAssert.CompletesSynchronously(fs.ReadAsync(new byte[1], -1, -1)));
// buffer is checked first
AssertExtensions.Throws <ArgumentNullException>("buffer", () =>
FSAssert.CompletesSynchronously(fs.ReadAsync(null, -1, -1)));
}
}
public void NoTruncateOnFileShareViolation(FileMode fileMode)
{
string fileName = GetTestFilePath();
using (FileStream fs = CreateFileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
fs.Write(new byte[] { 42 }, 0, 1);
fs.Flush();
FSAssert.ThrowsSharingViolation(() => CreateFileStream(fileName, fileMode, FileAccess.Write, FileShare.None).Dispose());
}
using (FileStream reader = CreateFileStream(fileName, FileMode.Open, FileAccess.Read))
{
byte[] buf = new byte[1];
Assert.Equal(1, reader.Read(buf, 0, 1));
Assert.Equal(42, buf[0]);
}
}
public void WriteOnlyThrows()
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create, FileAccess.Write))
{
Assert.Throws <NotSupportedException>(() =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 0, 1)));
fs.Dispose();
// Disposed checking happens first
Assert.Throws <ObjectDisposedException>(() =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 0, 1)));
// out of bounds checking happens first
Assert.Throws <ArgumentOutOfRangeException>(() =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[2], 1, 2)));
}
}
public void CancelledTokenFastPath()
{
CancellationTokenSource cts = new CancellationTokenSource();
cts.Cancel();
CancellationToken cancelledToken = cts.Token;
string fileName = GetTestFilePath();
using (FileStream fs = new FileStream(fileName, FileMode.Create))
{
FSAssert.IsCancelled(fs.WriteAsync(new byte[1], 0, 1, cancelledToken), cancelledToken);
}
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
// before read only check
FSAssert.IsCancelled(fs.WriteAsync(new byte[1], 0, 1, cancelledToken), cancelledToken);
fs.Dispose();
// before disposed check
FSAssert.IsCancelled(fs.WriteAsync(new byte[1], 0, 1, cancelledToken), cancelledToken);
// out of bounds checking happens first
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[2], 1, 2, cancelledToken)));
// count is checked prior
Assert.Throws <ArgumentOutOfRangeException>("count", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], 0, -1, cancelledToken)));
// offset is checked prior
Assert.Throws <ArgumentOutOfRangeException>("offset", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(new byte[1], -1, -1, cancelledToken)));
// buffer is checked first
Assert.Throws <ArgumentNullException>("buffer", () =>
FSAssert.CompletesSynchronously(fs.WriteAsync(null, -1, -1, cancelledToken)));
}
}
public void WriteAsyncBufferedCompletesSynchronously()
{
// It doesn't make sense to spin up a background thread just to do a memcpy.
// This isn't working now for useAsync:true since we always have a usercallback
// that get's run on the threadpool (see Win32FileStream.EndWriteTask)
// This isn't working now for useAsync:false since we always call
// Stream.WriteAsync that queues Read on a background thread
foreach (bool useAsync in new[] { true, false })
{
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite | FileShare.Delete, TestBuffer.Length * 2, useAsync))
{
byte[] buffer = new byte[TestBuffer.Length];
// Existing issue: FileStreamAsyncResult doesn't set CompletedSynchronously correctly.
// write should now complete synchronously since it is just copying to the write buffer
FSAssert.CompletesSynchronously(fs.WriteAsync(buffer, 0, buffer.Length));
}
}
}
public void CancelledTokenFastPath()
{
var cts = new CancellationTokenSource();
cts.Cancel();
CancellationToken cancelledToken = cts.Token;
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create))
{
FSAssert.IsCancelled(ReadAsync(fs, new byte[1], 0, 1, cancelledToken), cancelledToken);
}
using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create, FileAccess.Write))
{
// before write only check
FSAssert.IsCancelled(ReadAsync(fs, new byte[1], 0, 1, cancelledToken), cancelledToken);
fs.Dispose();
// before disposed check
FSAssert.IsCancelled(ReadAsync(fs, new byte[1], 0, 1, cancelledToken), cancelledToken);
// out of bounds checking happens first
Assert.Throws <ArgumentException>(null, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[2], 1, 2, cancelledToken)));
// count is checked prior
AssertExtensions.Throws <ArgumentOutOfRangeException>(CountParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], 0, -1, cancelledToken)));
// offset is checked prior
AssertExtensions.Throws <ArgumentOutOfRangeException>(OffsetParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, new byte[1], -1, -1, cancelledToken)));
// buffer is checked first
AssertExtensions.Throws <ArgumentNullException>(BufferParamName, () =>
FSAssert.CompletesSynchronously(ReadAsync(fs, null, -1, -1, cancelledToken)));
}
}
public async Task ReadAsyncBufferedCompletesSynchronously()
{
// It doesn't make sense to spin up a background thread just to do a memcpy.
string fileName = GetTestFilePath();
using (FileStream fs = new FileStream(fileName, FileMode.Create))
{
fs.Write(TestBuffer, 0, TestBuffer.Length);
fs.Write(TestBuffer, 0, TestBuffer.Length);
}
// This isn't working now for useAsync:true since we always have a usercallback
// that get's run on the threadpool (see Win32FileStream.EndReadTask)
// This isn't working now for useAsync:false since we always call
// Stream.ReadAsync that queues Read on a background thread
foreach (bool useAsync in new[] { true, false })
{
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete, TestBuffer.Length * 2, useAsync))
{
byte[] buffer = new byte[TestBuffer.Length];
// Existing issue: FileStreamAsyncResult doesn't set CompletedSynchronously correctly.
// prime the internal buffer
Assert.Equal(TestBuffer.Length, await fs.ReadAsync(buffer, 0, buffer.Length));
Assert.Equal(TestBuffer, buffer);
Array.Clear(buffer, 0, buffer.Length);
// read should now complete synchronously since it is serviced by the read buffer filled in the first request
Assert.Equal(TestBuffer.Length,
FSAssert.CompletesSynchronously(fs.ReadAsync(buffer, 0, buffer.Length)));
Assert.Equal(TestBuffer, buffer);
}
}
}
public async Task ThrowWhenHandlePositionIsChanged()
{
string fileName = GetTestFilePath();
using (FileStream fs = new FileStream(fileName, FileMode.Create))
{
// write some data to move the position, flush to ensure OS position is updated
fs.Write(TestBuffer, 0, TestBuffer.Length);
fs.Flush();
if (fs.SafeFileHandle.IsInvalid)
{
// nothing to test
return;
}
using (FileStream fsr = new FileStream(fs.SafeFileHandle, FileAccess.Read, TestBuffer.Length))
{
Assert.Equal(TestBuffer.Length, fs.Position);
Assert.Equal(TestBuffer.Length, fsr.Position);
// Operations on original filestream will fail if data is in buffer and position changes.
// Put data in FS write buffer and update position from FSR
fs.WriteByte(0);
fsr.Position = 0;
Assert.Throws <IOException>(() => fs.Position);
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Read(new byte[1], 0, 1));
fs.WriteByte(0);
fsr.Position++;
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) // TODO: [ActiveIssue(812)]: Remove guard when async I/O is properly implemented on Unix
{
Assert.Throws <IOException>(() => FSAssert.CompletesSynchronously(fs.ReadAsync(new byte[1], 0, 1)));
}
else
{
await Assert.ThrowsAsync <IOException>(() => fs.ReadAsync(new byte[1], 0, 1));
}
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.ReadByte());
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Seek(0, SeekOrigin.End));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.SetLength(2));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Flush());
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Dispose());
}
}
}
private async Task ThrowWhenHandlePositionIsChanged(bool useAsync)
{
string fileName = GetTestFilePath();
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite, 0x100, useAsync))
{
// write some data to move the position, flush to ensure OS position is updated
fs.Write(TestBuffer, 0, TestBuffer.Length);
fs.Flush();
if (fs.SafeFileHandle.IsInvalid)
{
// nothing to test
return;
}
using (FileStream fsr = new FileStream(fs.SafeFileHandle, FileAccess.Read, TestBuffer.Length, useAsync))
{
Assert.Equal(TestBuffer.Length, fs.Position);
Assert.Equal(TestBuffer.Length, fsr.Position);
// Operations on original filestream will fail if data is in buffer and position changes.
// Put data in FS write buffer and update position from FSR
fs.WriteByte(0);
fsr.Position = 0;
if (useAsync
// Async I/O behaviors differ due to kernel-based implementation on Windows
&& OperatingSystem.IsWindows()
// ReadAsync which in this case (single byte written to buffer) calls FlushAsync is now 100% async
// so it does not complete synchronously anymore
&& PlatformDetection.IsLegacyFileStreamEnabled)
{
Assert.Throws <IOException>(() => FSAssert.CompletesSynchronously(fs.ReadAsync(new byte[1], 0, 1)));
}
else
{
await Assert.ThrowsAsync <IOException>(() => fs.ReadAsync(new byte[1], 0, 1));
}
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Read(new byte[1], 0, 1));
fs.WriteByte(0);
fsr.Position++;
await Assert.ThrowsAsync <IOException>(() => fs.ReadAsync(new byte[1], 0, 1));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.ReadByte());
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Seek(0, SeekOrigin.End));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.SetLength(2));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Flush());
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Dispose());
}
}
}
private async Task ThrowWhenHandlePositionIsChanged(bool useAsync)
{
string fileName = GetTestFilePath();
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite, 0x100, useAsync))
{
// write some data to move the position, flush to ensure OS position is updated
fs.Write(TestBuffer, 0, TestBuffer.Length);
fs.Flush();
if (fs.SafeFileHandle.IsInvalid)
{
// nothing to test
return;
}
using (FileStream fsr = new FileStream(fs.SafeFileHandle, FileAccess.Read, TestBuffer.Length, useAsync))
{
Assert.Equal(TestBuffer.Length, fs.Position);
Assert.Equal(TestBuffer.Length, fsr.Position);
// Operations on original filestream will fail if data is in buffer and position changes.
// Put data in FS write buffer and update position from FSR
fs.WriteByte(0);
fsr.Position = 0;
Assert.Throws <IOException>(() => fs.Position);
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Read(new byte[1], 0, 1));
fs.WriteByte(0);
fsr.Position++;
if (useAsync && RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) // Async I/O behaviors differ due to kernel-based implementation on Windows
{
Assert.Throws <IOException>(() => FSAssert.CompletesSynchronously(fs.ReadAsync(new byte[1], 0, 1)));
}
else
{
await Assert.ThrowsAsync <IOException>(() => fs.ReadAsync(new byte[1], 0, 1));
}
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.ReadByte());
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Seek(0, SeekOrigin.End));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.SetLength(2));
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Flush());
fs.WriteByte(0);
fsr.Position++;
Assert.Throws <IOException>(() => fs.Dispose());
}
}
}
