public static LambdaExpression BuildPredicate(this FilterGroup filterGroup, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filterGroup == null)
{
throw new ArgumentNullException(nameof(filterGroup));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
if (!IsValid(filterGroup, arg))
{
throw new InvalidOperationException("The operator or property name is not valid");
}
return(FilterExtensions.BuildPredicateInternal(filterGroup.Filters, type, arg));
}
internal static EvaluationResult <T, bool> TryBuildPredicate <T>(this FilterGroup filterGroup, BuildArgument arg)
{
filterGroup.Filters.ForEach(f => { arg.IsValidProperty(f.Property); arg.IsValidOperator(f.Operator); });
if (arg.InvalidProperties.Any() || arg.InvalidOperators.Any())
{
return(new EvaluationResult <T, bool>
{
InvalidProperties = arg.InvalidProperties,
InvalidOperators = arg.InvalidOperators
});
}
try
{
var expression = (Expression <Func <T, bool> >)FilterExtensions.BuildPredicateInternal(filterGroup.Filters, typeof(T), arg);
return(new EvaluationResult <T, bool>
{
Result = expression,
Succeeded = true
});
}
catch (Exception ex)
{
return(new EvaluationResult <T, bool>
{
Exception = ex
});
}
}