Expr Explicit Expr to Int64 Conversion

Converts the Expr to a long integer value. This is the same operation as calling the AsInt64 method.

[Visual Basic]
returnValue = Expr.op_Explicit(e)

[C#]
public static explicit operator long(
Expr e
);

Exception Type	Condition
ExprFormatException	If the Expr cannot be converted to this format.