private Expression <Func <PreFilterTotal <T>, bool> > IndividualPropertySearch(DataTableRequest request)
{
var paramExpression = Expression.Parameter(typeof(PreFilterTotal <T>), "val");
Expression compoundExpression = Expression.Constant(true);
foreach (var dataTableColumn in request.Columns)
{
var query = dataTableColumn.SearchTerm;
if (string.IsNullOrEmpty(query))
{
continue;
}
var searchColumn = dataTableColumn.ColumnIndex;
if (searchColumn < 0 || searchColumn >= properties.Length)
{
continue;
}
var propertyToSearch = properties[searchColumn];
if (!searchableProperties.Contains(propertyToSearch))
{
continue;
}
var expression = ParseFactory.GetParser(query, propertyToSearch, paramExpression).GetSearchExpression();
compoundExpression = Expression.And(compoundExpression, expression);
}
var result = Expression.Lambda <Func <PreFilterTotal <T>, bool> >(compoundExpression, paramExpression);
return(result);
}
private IEnumerable <Expression> GetSearchQueries(string searchExpression, ParameterExpression paramExpression)
{
return(properties.Where(x => searchableProperties.Contains(x)).Select(property => ParseFactory.GetParser(searchExpression, property, paramExpression).GetSearchExpression()));
}