public static Expression <Hoisted <TIn, TOut> > Hoist(Expression <Func <TIn, TOut> > expr)
{
// rewrite Expression<Func<TIn, TOut>> as Expression<Hoisted<TIn, TOut>>
var visitor = new HoistingExpressionVisitor <TIn, TOut>();
var rewrittenBodyExpr = visitor.Visit(expr.Body);
var rewrittenLambdaExpr = Expression.Lambda <Hoisted <TIn, TOut> >(rewrittenBodyExpr, expr.Parameters[0], _hoistedConstantsParamExpr);
return(rewrittenLambdaExpr);
}
public static Expression <Hoisted <TIn, TOut> > Hoist(Expression <Func <TIn, TOut> > expr)
{
HoistingExpressionVisitor <TIn, TOut> hoistingExpressionVisitor = new HoistingExpressionVisitor <TIn, TOut>();
Expression body = hoistingExpressionVisitor.Visit(expr.Body);
return(Expression.Lambda <Hoisted <TIn, TOut> >(body, new ParameterExpression[]
{
expr.Parameters[0],
HoistingExpressionVisitor <TIn, TOut> ._hoistedConstantsParamExpr
}));
}