How do you prevent a file from being modified while reading it?

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ICSM Computer · Answer

To prevent a file from being modified while you are reading it in C#, you need to open it with exclusive read access by using the appropriate FileShare mode. Use FileShare.None to Deny Others Access When you open the file for reading, specify FileShare.None so that no other process can open the file (even for writing) while it's being read. FileShare Options Summary FileShare Option Meaning None Denies all other access (exclusive lock). ✅ Read Allows others to read but not write. Write Allows others to write but not read. ReadWrite Allows others to read and write. Delete Allows others to delete the file. Notes Exclusive locks will throw an exception if another process tries to access the file.If you're in a multi-threaded app, you can use a lock or Mutex in addition for thread-level synchronization.In real-time logging or shared file scenarios, consider using FileShare.ReadWrite with retry logic instead. Read More What are the best practices to handle large log files in C#?What is the difference between File.Open, File.OpenRead, and File.OpenWrite?Temporary file to be automatically deleted after the program ends?

How do you prevent a file from being modified while reading it?

1 Answers

Use `FileShare.None` to Deny Others Access

`FileShare` Options Summary

Notes

FileShare Option	Meaning
`None`	Denies all other access (exclusive lock). ✅
`Read`	Allows others to read but not write.
`Write`	Allows others to write but not read.
`ReadWrite`	Allows others to read and write.
`Delete`	Allows others to delete the file.

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How do you prevent a file from being modified while reading it?

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1 Answers

Use FileShare.None to Deny Others Access

FileShare Options Summary

Notes

Use `FileShare.None` to Deny Others Access

`FileShare` Options Summary