Document that OpenFileDialog.OpenFile() throws IOException

[binki]

OpenFileDialog.OpenFile() is a thin wrapper around new FileStream(). Thus, it will throw the same exceptions. Unlike SaveFileDialog.OpenFile() which behaves differently on mono, this behavior is the same on .netfx, .netcore, and mono.

Please document that OpenFileDialog.OpenFile() will throw IOException if the file cannot be opened, such as if it was removed or renamed prior to calling OpenFile().

[joperezr]

@RussKie Given this is a winforms API, could you please route this accordingly?

[RussKie]

On a second thought, this belongs to dotnet/dotnet-api-docs. A PR with a desired wording is welcome.