/// <summary>
/// Extracts all constants from an expression (including closures) and returns a lambda expression that takes all these constants as parameters.
/// </summary>
public static ExtractionResult ExtractConstants(Expression expression)
{
var visitor = new ConstantExtractor(rewriteTree: true);
var constantFreeBody = visitor.Visit(expression);
return(new ExtractionResult(Expression.Lambda(constantFreeBody, visitor.parameters), visitor.constants));
}
/// <summary>
/// Extracts all constants from an expression (including closures) without rewriting the expression tree.
/// </summary>
public static IReadOnlyList <object> ExtractConstantsOnly(Expression expression)
{
var visitor = new ConstantExtractor(rewriteTree: false);
visitor.Visit(expression);
return(visitor.constants);
}