public LogicalBindaryExpression(Expression left, Expression right, LogicalOperator @operator)
{
Require.NotNull(left, "left");
Require.NotNull(right, "right");
Left = left;
Right = right;
Operator = @operator;
}
/// <summary>
/// Evalute the value of the specified condition expression.
/// </summary>
/// <param name="expression">The condition expression to evaluate.</param>
/// <param name="dataContext">The context object.</param>
/// <returns>True if the the condition passed, false otherwise.</returns>
public bool Evaluate(Expression expression, object dataContext)
{
Require.NotNull(expression, "expression");
Require.NotNull(dataContext, "dataContext");
_dataContext = dataContext;
var dataContextType = dataContext.GetType();
_availableParameters = _parameterProviders.SelectMany(x => x.GetParameters(dataContextType))
.DistinctBy(x => x.Name)
.ToList();
Visit(expression);
Debug.Assert(_results.Count == 1);
return _results.Pop();
}
protected virtual void Visit(Expression exp)
{
exp.Accept(this);
}
void IExpressionVisitor.Visit(Expression exp)
{
Visit(exp);
}
public bool Evaluate(Expression expression, object dataContext)
{
Require.NotNull(expression, "expression");
Require.NotNull(dataContext, "dataContext");
var evaluator = new ExpressionEvaluator(ParameterProviders, ComparisonOperators);
return evaluator.Evaluate(expression, dataContext);
}
