Expression Class

Reference

Definition

Namespace:: AdaptiveExpressions

Assembly:: AdaptiveExpressions.dll

Package:: AdaptiveExpressions v4.22.7

Important

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An expression which can be analyzed or evaluated to produce a value.

public class Expression

type Expression = class

Public Class Expression

Inheritance: Object
Expression

Derived: AdaptiveExpressions.Constant

AdaptiveExpressions.TriggerTrees.Clause

Remarks

This provides an open-ended wrapper that supports a number of built-in functions and can also be extended at runtime. It also supports validation of the correctness of an expression and evaluation that should be exception free.

Constructors

Expression(ExpressionEvaluator, Expression[])	Initializes a new instance of the Expression class. Expression constructor.
Expression(String, Expression[])	Initializes a new instance of the Expression class. Built-in expression constructor.

Fields

Functions

Dictionary of function => ExpressionEvaluator.

Properties

Children	Gets or sets children expressions.
Evaluator	Gets expression evaluator.
ReturnType	Gets expected result of evaluating expression.
Type	Gets type of expression.

Methods

Accessor(String, Expression)	Construct and validate a property accessor.
AndExpression(Expression[])	Construct and validate an And expression.
ConstantExpression(Object)	Construct a constant expression.
DeepEquals(Expression)	Do a deep equality between expressions.
EqualsExpression(Expression[])	Construct and validate an Equals expression.
LambaExpression(EvaluateExpressionDelegate)	Construct an expression from a EvaluateExpressionDelegate.
Lambda(Func<Object,Object>)	Construct an expression from a lambda expression over the state.
Lookup(String)	Lookup a ExpressionEvaluator (function) by name.
MakeExpression(ExpressionEvaluator, Expression[])	Make an expression and validate it.
MakeExpression(String, Expression[])	Make an expression and validate it.
NotExpression(Expression)	Construct and validate a Not expression.
OrExpression(Expression[])	Construct and validate an Or expression.
Parse(String, EvaluatorLookup)	Parse an expression string into an expression object.
References()	Return the static reference paths to memory.
ReferenceWalk(Expression, Func<Expression,Boolean>)	Walking function for identifying static memory references in an expression.
SetPathToValue(Expression, Expression)	Construct and validate an Set a property expression to a value expression.
SetPathToValue(Expression, Object)	Construct and validate an Set a property expression to a value expression.
ToString()	Returns a string that represents the current object.
TryEvaluate(IMemory, Options)	Evaluate the expression.
TryEvaluate(Object, Options)	Evaluate the expression.
TryEvaluate<T>(IMemory, Options)	Evaluate the expression.
TryEvaluate<T>(Object, Options)	Evaluate the expression.
Validate()	Validate immediate expression.
ValidateTree()	Recursively validate the expression tree.

Operators

Implicit(String to Expression)

allow a string to be implicitly assigned to an expression property.

Extension Methods

DisjunctiveNormalForm(Expression)	Rewrite expression into disjunctive normal form.
PushDownNot(Expression)	Rewrite the expression by pushing not down to the leaves.

Applies to

Jaa