File.WriteAllText and Concurrent Accesses

Question

Suppose I\'m writing a very long string to a file using File.WriteAllText, and another thread or process is trying to read the same file. Would it throw any exception? In ot

Answer 1

MSDN doesn't document which sharing mode is used.

You could look at the source code (either published or via a disassembler), or look at the option at runtime (eg. using Process Monitor and then translating the WIn32 API flags into FileShare value).

But as it isn't documented a patch or new version could change it.

Alternatively if it matters open the file yourself using one of the FileStream overloads that takes a FileShare parameter, open a StreamWriter over this and then write the text.

Would it throw any exception?

Yes. If the file is open already with an incompatible sharing mode the open will fail.