FileShare Enum

Question

Hello,

My case is vb.net:

Using imp As New FileStream(LoadTextBox.Text, FileMode.Open, FileAccess.Read)

Using exp As New FileStream(SaveTextBox.Text, FileMode.Create, FileAccess.Write)

...

End Using

only above 2 constructures, anyhow, since I don't specify the FileShare Enum, what's the default behavior for each one? (.netfw 4.0)

Answer 1

According to documentation, “it is opened sharing Read access (that is, requests to open the file for writing by this or another process will fail until the FileStream object has been closed, but read attempts will succeed)” [https://learn.microsoft.com/en-us/dotnet/api/system.io.filestream.-ctor?view=netframework-4.0#system-io-filestream-ctor(system-string-system-io-filemode-system-io-fileaccess)].

Answer 2

From the Remarks here, https://learn.microsoft.com/en-us/dotnet/api/system.io.filestream.-ctor?view=netframework-4.8.1#system-io-filestream-ctor(microsoft-win32-safehandles-safefilehandle-system-io-fileaccess) It says "FileShare.Read is the default for those FileStream constructors without a FileShare parameter."