public override IQueryable GetQueryable(IQueryable source)
{
if (source == null)
{
return(null);
}
if ((DataFields == null) || String.IsNullOrEmpty(DataFields.Trim()))
{
throw new InvalidOperationException(AtlasWeb.Expressions_DataFieldRequired);
}
IDictionary <string, object> values = GetValues();
if (values.Count == 0)
{
throw new InvalidOperationException(AtlasWeb.SearchExpression_ParameterRequired);
}
string query = Convert.ToString(values.First().Value, CultureInfo.CurrentCulture);
if (String.IsNullOrEmpty(query))
{
return(null);
}
string[] properties = DataFields.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
// Use the or expression to or the fields together
List <Expression> searchExpressions = new List <Expression>();
ParameterExpression parameterExpression = Expression.Parameter(source.ElementType, String.Empty);
foreach (string p in properties)
{
Expression property = ExpressionHelper.CreatePropertyExpression(parameterExpression, p.Trim());
searchExpressions.Add(CreateCallExpression(property, query));
}
return(ExpressionHelper.Where(source,
Expression.Lambda(ExpressionHelper.Or(searchExpressions),
parameterExpression)));
}
