I'm using .NET Framework 1.0.3705 to build an automation tool that processes a lot of files, and keeps logs on what it's doing. At some point in a larger run (I don't have access to the user's full data set), a user received the following error message:
"Warning: A StringBuilder buffer has been overflowed by unmanaged code. The process may become unstable. Insufficient capacity allocated to the StringBuilder before marshaling it."
The question is: what might cause this? I'm not actually using StringBuilder directly (though I can see that maybe I should); I am concatenating some potentially large strings for logging and reporting.
Unfortunately, I don't know where in my code this is happening, only that it isn't happening on my smaller data set. In different places, I call TextBox.appendLine, textbox.text (set), StreamWriter.WriteLine, and StreamWriter.Write. Those are the only calls that I can think of that might use StringBuilder. (Does inline concatenation of strings use StringBuilder? I do that, too, of course: a = b & c.)
Extrapolating from my smaller data set, I'd estimate that the largest these strings could get is around 600,000 characters long. By default, StringBuilder has a maximum capacity of Int32.MaxValue (2,147,483,647) characters, according to this:
So that's curious. I'm also curious about the error's claim that this is happening in unmanaged code. I thought that .NET was all managed code.
The user is presently running the job again (it takes a few hours) to regenerate output that he deleted. I might know more after he finishes that; if so, I will post here again.
Thanks in advance!