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For reference types, you only ever use ByRef if you want to assign a new object to the parameter inside the method and have that change affect the original reference. You're not assigning anything to the parameter in the method so there can't possibly be a reason to use ByRef. ByVal is the default for a reason. As for your code, it has a number of shortcomings. Firstly, catching any and every exception and declaring that the file is open based on that is wrong. What if a FileNotFoundException is thrown?
How does the fact that a file doesn't exist indicate that it is open? Even ignoring that, your code could be improved in a number of ways. This: vb. If you open the file with a Using statement then the FileStream will be implicitly closed if it is successfully created: vb. Open fileName, FileMode. Why is my data not saved to my database?
I have a problem with That seems to suggest that you have defined your own class named Exception. That would explain why you're not catching the exception in that method. It is an IOException that is being thrown, which does inherit System. Exception, but you are actually catching something other than System. Exception and so you don't catch the exception that is thrown. In your code, change Exception to System. Exception and I expect that it will work as you expect. In that case, find that class named Exception and get rid of it or, if it actually does serve a useful purpose, rename it to something sensible.
Thank you!! I can't check this right now but I'm sure it's the answer. Same thing. It says system. IOException so I don't think I've defined my own class for an exception. Last edited by sgrya1; Feb 6th, at AM. That's a complete non-sequitur. What that is telling you is that a System. IOException was thrown. That class inherits the System.
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Exception class so, if your code was actually catching System. Exception then it would catch an IOException. The fact that it's not means that you are not catching System.
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Nothing you have shown there is any indication that you haven't defined your own Exception class and, in fact, is evidence that you have. As far as I can tell, it's either that or something on your system is broken. The way to find out what that class actually is to right-click on it and select Go To Declaration or the like. If you have declared that type in your own code then doing that will show you where.
That said, as I already mentioned, you shouldn't be catching System. Exception in the first place. The point of your code is to determine whether a file is already open and it will only be an IOException that gets thrown in that situation so it should be only IOException that you are catching. As I stated quite clearly, catching System. Exception would result in your telling the user that a file that didn't exist was already open, which doesn't seem like any good application should be doing.
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I've been bit by that before. It's not conducive to the general learning of others. Save a few bits and don't bother. I'll just end up rejecting anyways. Open fileName, IO. Open, IO. Read, IO. As jmcilhinney and techgnome has suggested I my project has a reference. Thank you all for pointing that out.
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TechnologyAdvice does not include all companies or all types of products available in the marketplace. Remember Me? The text was updated successfully, but these errors were encountered:. I don't think serilog should be relying on this API on non-Windows platforms like it currently does, it's pure luck that it works as is.
Exception has HResult property. It is what it typically returns on Windows. Note that Marshal. MSDN has more details about it. Skip to content. New issue.
IOException HResult possible values - Javaer
Jump to bottom. Labels area-System. Milestone 1. Copy link. Take this example program: using System; using System. IO; using System. NET Core : Any reason why you're returning 0 instead of -1 or some other generic error code?
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Member Author. HResult on non-Windows platforms …. Add test for Marshal.