private Expression <Func <Note, bool> > GetFilterExpression(Guid?ownerId, string title, string text,
string[] tags)
{
Expression <Func <Note, bool> > exp = null;
if (ownerId != null)
{
exp = e => e.CreatedBy == ownerId;
}
if (title != null)
{
exp = QueryableExtensions.AndAlso(exp, e => e.Title.Contains(title));
}
if (text != null)
{
exp = QueryableExtensions.AndAlso(exp, e => e.Text.Contains(text));
}
if (tags != null && tags.Any())
{
Expression <Func <Note, bool> > expTags = null;
foreach (var tag in tags)
{
expTags = expTags == null
? e => e.Tags.Any(t => t.Value == tag)
: QueryableExtensions.CombineOr(expTags, e => e.Tags.Any(t => t.Value == tag));
}
exp = QueryableExtensions.AndAlso(exp, expTags);
}
return(exp);
}