NGWS SDK Documentation  

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12.5.2 TypeOf…Is operator

The TypeOf…Is operator is used to check whether the runtime type of an object is compatible with a given type. The first operand must be a reference type, and the second operand must be a type name. The operator returns True if a conversion from the runtime type of the operand to the type exists.

TypeOfIsOperatorExpression ::= TypeOf Expression Is TypeName