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static private GetAmbientScope ( ) : |
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| Résultat | ||
public AmbientContextSuppressor()
{
_savedScope = DbContextScope.GetAmbientScope();
// We're hiding the ambient scope but not removing its instance
// altogether. This is to be tolerant to some programming errors.
//
// Suppose we removed the ambient scope instance here. If someone
// was to start a parallel task without suppressing
// the ambient context and then tried to suppress the ambient
// context within the parallel task while the original flow
// of execution was still ongoing (a strange thing to do, I know,
// but I'm sure this is going to happen), we would end up
// removing the ambient context instance of the original flow
// of execution from within the parallel flow of execution!
//
// As a result, any code in the original flow of execution
// that would attempt to access the ambient scope would end up
// with a null value since we removed the instance.
//
// It would be a fairly nasty bug to track down. So don't let
// that happen. Hiding the ambient scope (i.e. clearing the CallContext
// in our execution flow but leaving the ambient scope instance untouched)
// is safe.
DbContextScope.HideAmbientScope();
}
private static DbContextScope GetConfirmScope()
{
var scope = DbContextScope.GetAmbientScope();
if (scope == null)
{
throw new InvalidOperationException("No open DB Scope detected, did you forget to open one?");
}
return(scope);
}