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Asked: 2026-06-18T01:29:20+00:00

I was reading File.AppendAllText method from msdn http://msdn.microsoft.com/en-us/library/ms143356.aspx I saw they have listed FileNotFoundException

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I was reading File.AppendAllText method from msdn

http://msdn.microsoft.com/en-us/library/ms143356.aspx

I saw they have listed FileNotFoundException to possible exceptions list for the method but according to there description about method on the same page

Opens a file, appends the specified string to the file, and then closes the file.
If the file does not exist, this method creates a file,
writes the specified string to the file, then closes the file.

this part

If the file does not exist, this method creates a file

it seems this exception can never be thrown for this method.

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1 Answer

  1. Editorial Team

    If you take a look at (say) Mono’s implementation (which is compatible with Microsoft’s), all File.AppendAllText ends up doing (argument checks aside) is creating a StreamWriter with your path and calling a Write on that object.

    Neither the used constructor nor the method are listed anywhere to throw a FileNotFoundException, as far as I can tell, so it might be a documentation error.

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