Called by the PACSFramework to determine if the file that corresponds to token exists on the external store.
token
the unique string value that is used to retrieve the data from the external store
exists
will contain true
if the file exists on the external store; will contain false
otherwise
null
if successful; otherwise return an appropriate exception. Note that the exception is returned and not thrown.
For an example, see the Leadtools.Medical.ExternalStore.Sample.Addin demo located here: <INSTALLDIR>\Examples\PACSFramework\CS\Sample AddIns\Leadtools.Medical.ExternalStore.Sample.Addin
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