public Expression <TraceLogFilterPredicate> CreatePredicateExpr(TraceLogFilter filter)
{
var enabled = filter.Conditions.Where(x => x.IsEnabled).ToList();
var includedConds = enabled.Where(x => x.Action == FilterConditionAction.Include);
var excludedConds = enabled.Where(x => x.Action == FilterConditionAction.Exclude);
var includeExpr = ExpressionEx.OrElse(includedConds.Select(CreateComparisonExpr), true);
var excludeExpr = ExpressionEx.OrElse(excludedConds.Select(CreateComparisonExpr), false);
var filterExpr = Expression.AndAlso(includeExpr, Expression.Not(excludeExpr));
return(CreateLambda(filterExpr));
}
Expression INodeVisitor <Expression, ExpressionNodeVisitorInput> .VisitComplexNode(ComplexNode node, ExpressionNodeVisitorInput input)
{
Expression expression = null;
foreach (var childNode in node.Nodes)
{
expression =
expression == null
? childNode.Accept(this, input)
: childNode.LogicalOperator == LogicalOperator.And
? ExpressionEx.AndAlso(expression, childNode.Accept(this, input))
: ExpressionEx.OrElse(expression, childNode.Accept(this, input));
}
return(expression);
}
