public Expression <Func <T, bool> > GetFilterExpression <T>(IEnumerable <string> values) where T : SearchResultItem
{
DateTime startDate = DateTime.MinValue;
DateTime endDate = DateTime.MinValue;
DateTime.TryParse(values.First(), out startDate);
DateTime.TryParse(values.Last(), out endDate);
// lets make sure items are within the day.
if (endDate > DateTime.MinValue)
{
endDate = endDate.AddHours(23);
endDate = endDate.AddMinutes(59);
endDate = endDate.AddSeconds(59);
}
ParameterExpression expression = Expression.Parameter(typeof(T), "item");
ConditionContext context = new ConditionContext(expression);
var greaterThan = new Func <Expression, Expression, Expression>(Expression.GreaterThanOrEqual);
var lessThan = new Func <Expression, Expression, Expression>(Expression.LessThanOrEqual);
var dateRangeExpression = Expression.Lambda <Func <T, bool> >(greaterThan(Expression.Property(context.ParameterExpression, typeof(T), SearchResultItemUtil.GetPropertyName <T>(InnerItem.Field_Name)), Expression.Constant(startDate)), new[] { expression });
if (endDate > DateTime.MinValue)
{
dateRangeExpression = dateRangeExpression.And(Expression.Lambda <Func <T, bool> >(lessThan(Expression.Property(context.ParameterExpression, typeof(T), SearchResultItemUtil.GetPropertyName <T>(InnerItem.Field_Name)), Expression.Constant(endDate)), new[] { expression }));
}
return(dateRangeExpression);
}
public Expression <Func <T, bool> > GetFilterExpression <T>(IEnumerable <string> values) where T : SearchResultItem
{
int year = ValidateInput(values.FirstOrDefault());
// abort if input is no good
if (year == 0)
{
return(null);
}
DateTime startTime = new DateTime(year, 1, 1);
DateTime endTime = new DateTime(year, 12, 31);
ParameterExpression expression = Expression.Parameter(typeof(T), "item");
ConditionContext context = new ConditionContext(expression);
var greaterThan = new Func <Expression, Expression, Expression>(Expression.GreaterThanOrEqual);
var lessThan = new Func <Expression, Expression, Expression>(Expression.LessThanOrEqual);
var dateRangeExpression = Expression.Lambda <Func <T, bool> >(greaterThan(Expression.Property(context.ParameterExpression, typeof(T), SearchResultItemUtil.GetPropertyName <T>(InnerItem.Field_Name)), Expression.Constant(startTime)), new[] { expression });
dateRangeExpression = Expression.Lambda <Func <T, bool> >(lessThan(Expression.Property(context.ParameterExpression, typeof(T), SearchResultItemUtil.GetPropertyName <T>(InnerItem.Field_Name)), Expression.Constant(endTime)), new[] { expression });
return(dateRangeExpression);
}
protected override Expression GetTypedFieldValueExpression(ConditionContext p_Context)
{
return(Expression.Property(p_Context.ParameterExpression, typeof(SearchResultItem), SearchResultItemUtil.GetPropertyName <SearchResultItem>(FieldName)));
}
public Expression <Func <T, bool> > GetFilterExpression <T>(IEnumerable <string> values) where T : SearchResultItem
{
bool comparison = false;
bool.TryParse(values.FirstOrDefault(), out comparison);
if ((!InnerItem.Apply_When_True && comparison) || (!InnerItem.Apply_When_False && !comparison))
{
return(null);
}
ParameterExpression expression = Expression.Parameter(typeof(T), "item");
ConditionContext context = new ConditionContext(expression);
var equals = new Func <Expression, Expression, Expression>(Expression.Equal);
return(Expression.Lambda <Func <T, bool> >((Expression)equals(Expression.Property(context.ParameterExpression, typeof(T), SearchResultItemUtil.GetPropertyName <T>(InnerItem.Field_Name)), Expression.Constant(comparison)), new[] { expression }));
}