protected virtual string GetExpression()
{
List <string> stringList = new List <string>();
for (int index = 0; index < this.Count; ++index)
{
FilterDescriptor filterDescriptor1 = this[index];
CompositeFilterDescriptor filterDescriptor2 = filterDescriptor1 as CompositeFilterDescriptor;
string str;
if (filterDescriptor2 != null)
{
foreach (FilterDescriptor filterDescriptor3 in (Collection <FilterDescriptor>)filterDescriptor2.FilterDescriptors)
{
if (!string.IsNullOrEmpty(filterDescriptor3.PropertyName))
{
this.owner.Columns.GetColumnByFieldName(filterDescriptor3.PropertyName);
}
}
str = CompositeFilterDescriptor.GetCompositeExpression(filterDescriptor2, new Function <FilterDescriptor, object>(this.FormatDescriptorValue));
}
else if (!string.IsNullOrEmpty(filterDescriptor1.PropertyName) && this.owner.Columns.GetColumnByFieldName(filterDescriptor1.PropertyName) != null)
{
DateFilterDescriptor dateTimeFilterDescriptor = filterDescriptor1 as DateFilterDescriptor;
str = dateTimeFilterDescriptor == null?FilterDescriptor.GetExpression(filterDescriptor1, new Function <FilterDescriptor, object>(this.FormatDescriptorValue)) : DateFilterDescriptor.GetExpression(dateTimeFilterDescriptor);
}
else
{
continue;
}
if (!string.IsNullOrEmpty(str))
{
stringList.Add(str);
}
}
return(string.Join(this.LogicalOperator == FilterLogicalOperator.And ? " AND " : " OR ", stringList.ToArray()));
}