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 messageusually the symbol NET
    message tagtypically "netexceptn" or "netpexceptn"
    string descriptiona 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.


Basic Examples  (1)

Click for copyable input
  • This silences messages:
  • In[2]:=
    Click for copyable input

    See Also