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Remove ObjectDisposedException as inner exception for connection timeout #1035

bgrainger opened this issue Sep 17, 2021 · 1 comment


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Connection timeout is implemented by disposing a TcpClient; after this happens, the ObjectDisposedException is preserved as the InnerException for a MySqlException:

throw new MySqlException(MySqlErrorCode.UnableToConnectToHost, "Connect Timeout expired.", ex);

This was done to provide additional diagnostic information.

Despite the clear outer exception message, this routinely gets reported as an ObjectDisposedException, e.g.,:

This may be exacerbated by monitoring tools reporting the inner exception. (This screenshot from Application Insights is a slightly different inner exception but I think I've seen the same problem with it.)


The ObjectDisposedException is really just a detail of how timeout is currently implemented and ultimately not germane to the connection timeout; to avoid potential confusion we should throw a MySqlException with no inner exception. (This is potentially a breaking change if anyone had a catch () when block based on the inner exception.)

bgrainger added a commit that referenced this issue Sep 17, 2021
This improves diagnostics by removing potentially-confusing or distracting information.
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Fixed in 1.3.13.

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