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$NETExceptionHandler—Wolfram Documentation

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$NETExceptionHandler

allows you to control how exceptions thrown in .NET are handled in the Wolfram Language.

• To use $NETExceptionHandler, you first need to load .NET/Link using Needs["NETLink`"].
• The default behavior is for exceptions to appear as messages in the Wolfram System. To override this behavior (e.g. to temporarily silence messages from exceptions), assign a value to $NETExceptionHandler.
• The value of $NETExceptionHandler is treated as a function that will be passed three arguments:
• symbol associated with the message usually the symbol NET message tag typically "netexceptn" or "netpexceptn" string description a descriptive string associated with the exception
• The tag "netexceptn" generally is used for a typical exception, while the tag "netpexceptn" is used for exceptions generated by a manual return, where the exception occurs after the function has sent its result back to the Wolfram Language.
• You can use GetNETException in a handler function to obtain the .NET exception object manually.
• Typically, $NETExceptionHandler is assigned in a Block.

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