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4 changes: 3 additions & 1 deletion Sieve/Models/SieveOptions.cs
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
namespace Sieve.Models
namespace Sieve.Models
{
public class SieveOptions
{
Expand All @@ -13,5 +13,7 @@ public class SieveOptions
public bool IgnoreNullsOnNotEqual { get; set; } = true;

public bool DisableNullableTypeExpressionForSorting { get; set; } = false;

public string CultureNameOfTypeConversion { get; set; } = "en";
}
}
10 changes: 6 additions & 4 deletions Sieve/Services/SieveProcessor.cs
Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
Expand Down Expand Up @@ -172,6 +173,8 @@ protected virtual IQueryable<TEntity> ApplyFiltering<TEntity>(TSieveModel model,
return result;
}

var cultureInfoToUseForTypeConversion = new CultureInfo(Options.Value.CultureNameOfTypeConversion ?? "en");

Expression outerExpression = null;
var parameter = Expression.Parameter(typeof(TEntity), "e");
foreach (var filterTerm in model.GetFiltersParsed())
Expand All @@ -198,7 +201,7 @@ protected virtual IQueryable<TEntity> ApplyFiltering<TEntity>(TSieveModel model,

var filterValue = isFilterTermValueNull
? Expression.Constant(null, property.PropertyType)
: ConvertStringValueToConstantExpression(filterTermValue, property, converter);
: ConvertStringValueToConstantExpression(filterTermValue, property, converter, cultureInfoToUseForTypeConversion);

if (filterTerm.OperatorIsCaseInsensitive && !isFilterTermValueNull)
{
Expand Down Expand Up @@ -309,15 +312,14 @@ private static Expression GenerateFilterNullCheckExpression(Expression propertyV
Expression.NotEqual(propertyValue, Expression.Default(propertyValue.Type)));
}

private static Expression ConvertStringValueToConstantExpression(string value, PropertyInfo property,
TypeConverter converter)
private static Expression ConvertStringValueToConstantExpression(string value, PropertyInfo property, TypeConverter converter, CultureInfo cultureInfo)
{
// to allow user to distinguish between prop==null (as null) and prop==\null (as "null"-string)
value = value.Equals(EscapeChar + NullFilterValue, StringComparison.InvariantCultureIgnoreCase)
? value.TrimStart(EscapeChar)
: value;
dynamic constantVal = converter.CanConvertFrom(typeof(string))
? converter.ConvertFrom(value)
? converter.ConvertFrom(null, cultureInfo, value)
: Convert.ChangeType(value, property.PropertyType);

return GetClosureOverConstant(constantVal, property.PropertyType);
Expand Down