private static Expression <Func <T, bool> > CreateDateTimeComparerLambda <T>(Expression expression, ParameterExpression parameter, string keyword)
{
var indexOfEmptySpace = Expression.Call(expression, InternalExpressionExtensions.GetIndexOfMethod(), Expression.Constant(" "));
var dateExpression = Expression.Call(expression, InternalExpressionExtensions.GetSubstringWithStartAndEndMethod(), Expression.Constant(0), indexOfEmptySpace);
var timeExpression = Expression.Call(expression, InternalExpressionExtensions.GetSubstringWithStartMethod(), Expression.Add(indexOfEmptySpace, Expression.Constant(1)));
var date = keyword;
var time = keyword;
if (keyword.Contains(' ') == true)
{
var dateAndTime = keyword.Split(new char[] { ' ' });
var dateComparerExpression = GetDateComparerExpression <T>(dateExpression, parameter, dateAndTime[0]);
var timeComparerExpression = GetTimeComparerExpression <T>(timeExpression, parameter, dateAndTime[1], InternalExpressionExtensions.GetStartsWithMethod());
//o => o.ComparerMethod((property ?? "").Substring(0, property.IndexOf(' ')).ToLower().Contains(date))
// .And(o.ComparerMethod((property ?? "").Substring(property.IndexOf(' ')).ToLower().StartsWith(time)))
return(dateComparerExpression.And(timeComparerExpression));
}
else
{
var dateComparerExpression = GetDateComparerExpression <T>(dateExpression, parameter, date);
var timeComparerExpression = GetTimeComparerExpression <T>(timeExpression, parameter, time, InternalExpressionExtensions.GetContainsMethod());
//o => o.ComparerMethod((property ?? "").Substring(0, property.IndexOf(' ')).ToLower().Contains(date))
// .Or(o.ComparerMethod((property ?? "").Substring(property.IndexOf(' ')).ToLower().Contains(time)))
return(dateComparerExpression.Or(timeComparerExpression));
}
}
private static Expression <Func <T, bool> > GetDateComparerExpression <T>(Expression dateExpression, ParameterExpression parameter, string date)
{
var compareDateExpression = Expression.Call(dateExpression, InternalExpressionExtensions.GetContainsMethod(), Expression.Constant(date, typeof(string)));
return(Expression.Lambda <Func <T, bool> >(compareDateExpression, parameter));
}