filestream append and read access at same time?

[Bob]

Hi,
Is there any setting that I can use to allow the same file to be open
in a filestream in append mode with one process and read in another.
I can see why concurrent appends or write modes wouldn't work but it
seems like maybe a read could coexist with append?

Thanks,
Bob

 

[Peter Duniho]

Hi,
Is there any setting that I can use to allow the same file to be open
in a filestream in append mode with one process and read in another.
I can see why concurrent appends or write modes wouldn't work but it
seems like maybe a read could coexist with append?

Take a look at the FileStream constructors that include a FileShare
enumeration value as a parameter.

Pete

 

[Analizer1]

Sample below for multi acces read and write

i have several multi threaded services and also reader of activity in this
log....

hope this helps

analizer1



if (!File.Exists(LogName.FullName))

{

sw = new FileStream(this.LogName.FullName, FileMode.Create,
FileAccess.ReadWrite, FileShare.ReadWrite);

}

else

{

sw = new FileStream(this.LogName.FullName, FileMode.Open,
FileAccess.ReadWrite, FileShare.ReadWrite);

}

 

[Peter Duniho]

Sample below for multi acces read and write

Note that there is a FileMode.CreateOrOpen enumeration value. There's
no need to check for file existence before creating the FileStream; you
can use the same constructor for both scenarios.

Pete

 

[Bob]

Note that there is a FileMode.CreateOrOpen enumeration value. There's
no need to check for file existence before creating theFileStream; you
can use the same constructor for both scenarios.

Pete

Thanks very much. It seems like I had to change a setting from
FileAccess.Read to FileAccess.ReadWrite which seems odd considering I
would think the former would be more restrictive. Thanks again.

 

[Peter Duniho]

Thanks very much. It seems like I had to change a setting from
FileAccess.Read to FileAccess.ReadWrite which seems odd considering I
would think the former would be more restrictive. Thanks again.

I'm not sure what you mean. The FileAccess determines how your process
opens the file. The FileShare determines what other processes can do
with a file you've opened.

You would certainly need to open the file with write access if you
expect to be able to write to it, thus the need for
FileAccess.ReadWrite.

Pete