public static Expression <Hoisted <TIn, TOut> > Hoist(Expression <Func <TIn, TOut> > expr)
{
HoistingExpressionVisitor <TIn, TOut> visitor = new HoistingExpressionVisitor <TIn, TOut>();
return(Expression.Lambda <
Hoisted <TIn, TOut> >(
visitor.Visit(expr.Body),
new ParameterExpression[] {
expr.Parameters[0],
HoistingExpressionVisitor <TIn, TOut> ._hoistedConstantsParamExpr
}));
}
private static Func <TIn, TOut> CompileFromFingerprint(Expression <Func <TIn, TOut> > expr)
{
Func <ExpressionFingerprintChain, Hoisted <TIn, TOut> > valueFactory = null;
List <object> capturedConstants;
ExpressionFingerprintChain fingerprintChain = FingerprintingExpressionVisitor.GetFingerprintChain(expr, out capturedConstants);
if (fingerprintChain == null)
{
return(null);
}
if (valueFactory == null)
{
valueFactory = _ => HoistingExpressionVisitor <TIn, TOut> .Hoist(expr).Compile();
}
Hoisted <TIn, TOut> del = CachedExpressionCompiler.Compiler <TIn, TOut> ._fingerprintedCache.GetOrAdd(fingerprintChain, valueFactory);
return(model => del(model, capturedConstants));
}