FileShare Enum

Peter Volz 1,295 Reputation points
2023-04-02T15:38:53.1+00:00

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)

C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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VB
VB
An object-oriented programming language developed by Microsoft that is implemented on the .NET Framework. Previously known as Visual Basic .NET.
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Accepted answer
  1. Viorel 113K Reputation points
    2023-04-02T15:50:52.85+00:00

    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)].


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  1. Dewayne Basnett 1,361 Reputation points
    2023-04-03T17:44:28.1333333+00:00

    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."

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