Var fileSignal = new FileSignal(Path.GetTempFileName())

Var signalTimestampChanged = LastSignal != signal / returns true if the file signal has changed, otherwise false. Using (var writer = new BinaryWriter(stream)) Using (var stream = new FileStream(FilePath, FileMode.Create, FileAccess.Write, FileShare.None)) / overwrites the existing central file and writes the current time into it. Return DateTime.FromBinary(reader.ReadInt64()) Using (var reader = new BinaryReader(stream)) Using (var stream = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.None)) Return new FileStream(FilePath, FileMode.Create, fileAccess, FileShare.None) Private Stream GetFileStream(FileAccess fileAccess)

Public FileSignal(string filePath) : this(filePath, 10) / constructor using a default value of 50 ms for sleepOnCollisionInterval and a default value of 10 for maxCollisions Public FileSignal(string filePath, int maxCollisions): this (filePath, maxCollisions, TimeSpan.FromMilliseconds(50)) / constructor using a default value of 50 ms for sleepOnCollisionInterval SleepOnCollisionInterval = sleepOnCollisionInterval Public FileSignal(string filePath, int maxCollisions, TimeSpan sleepOnCollisionInterval) / numbers of retries when not able to retrieve (exclusive) file access / path to the central file for signal control / type to set signals or check for them using a central file It´s not that smart as it´s a polling procedure and has a greater overhead than calling File.GetLastWriteTime, but if not checking the content from too many places too often, it will do the work. Fast and flexible, but another dependency and a possible point of failure (and some work, of course).Ĭ) Ensure the signalling process by replacing the content of a dedicated signal file that other processes regularly read. a tcp server client structure), communicating the changes directly instead of writing / reading files. See File.GetLastWriteTime seems to be returning 'out of date' valueī) Build up an active component realising the observer pattern (eg. Using (new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.None))Īssert.AreNotEqual(lastModified, File.GetLastWriteTime(tempFile)) Var lastModified = File.GetLastWriteTime(tempFile)

For example, this unit test worked well every time on my developer machine, but it always fails on our build server. The behaviour may vary between OS versions. You may get an old Timestamp, even if the file has been modified right before. Be aware that the function File.GetLastWriteTime does not always work as expected, the values are sometimes not instantaneously updated by the OS.

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