private Document CreateDocument <T>(T value) where T : class
{
Document doc = new Document();
PropertyDescriptorCollection pdc = TypeDescriptor.GetProperties(typeof(T));
foreach (PropertyDescriptor property in pdc)
{
property.GetChildProperties();
}
PropertyInfo[] properties = typeof(T).GetProperties();
foreach (var property in properties)
{
if (!property.IsDefined(typeof(FieldAttribute), false))
{
continue;
}
FieldAttribute attribute = property.GetCustomAttribute(typeof(FieldAttribute)) as FieldAttribute;
Field.Index index = attribute.Index;
Field.Store store = attribute.Store;
Field.TermVector termVector = attribute.TermVector;
Func <object, object> getValue = ReappearMember.CreatePropertyGetter(property);
string strPropVal = getValue(value)?.ToString();
doc.Add(new Field(property.Name, strPropVal ?? string.Empty, store, index, termVector));
}
return(doc);
}
public IList <T> Retrieve <T>(string keyword, out int totalCount, int pageIndex = 1, int pageSize = 10) where T : class, new()
{
using (IndexSearcher searcher = new IndexSearcher(directory, true))
{
List <string> queries = new List <string>();
List <string> fields = new List <string>();
List <Occur> flags = new List <Occur>();
List <SortField> sortFields = new List <SortField>();
PropertyInfo[] properties = typeof(T).GetProperties();
foreach (var property in properties)
{
if (property.IsDefined(typeof(OccurAttribute), false))
{
OccurAttribute attribute = property.GetCustomAttribute(typeof(OccurAttribute)) as OccurAttribute;
Occur occur = attribute.Occur;
if (!occur.Equals(Occur.MUST_NOT))
{
///这里queriesfields，flags一一对应，见MultiFieldQueryParser.Parse方法说明
queries.Add(keyword);
fields.Add(property.Name);
flags.Add(occur);
}
}
if (property.IsDefined(typeof(SortAttribute), false))
{
SortAttribute attribute = property.GetCustomAttribute(typeof(SortAttribute)) as SortAttribute;
int sortField = attribute.Type;
bool reverse = attribute.Reverse;
sortFields.Add(new SortField(property.Name, sortField, reverse));
}
}
Query query = MultiFieldQueryParser.Parse(Lucene.Net.Util.Version.LUCENE_30, queries?.ToArray(), fields?.ToArray(), flags?.ToArray(), analyzer);
//Query queryR= new TermRangeQuery()
TopDocs tds;
int startRowIndex = (pageIndex - 1) * pageSize; //分页
if (sortFields.Count > 0)
{
Sort sort = new Sort(sortFields?.ToArray());
TopFieldCollector collector = TopFieldCollector.Create(sort, pageIndex * pageSize, false, false, false, false);
searcher.Search(query, collector); //返回结果
tds = collector.TopDocs(startRowIndex, pageSize);
}
else
{
TopScoreDocCollector collector = TopScoreDocCollector.Create(pageIndex * pageSize, false);
searcher.Search(query, collector);
tds = collector.TopDocs(startRowIndex, pageSize);
}
totalCount = tds.TotalHits;
IList <T> list = new List <T>();
foreach (ScoreDoc sd in tds.ScoreDocs)
{
Document doc = searcher.Doc(sd.Doc);
T searchResult = new T();
foreach (var property in properties)
{
string value = doc.Get(property.Name);
if (!string.IsNullOrEmpty(value))
{
Action <object, object> setValue = ReappearMember.CreatePropertySetter(property);
if (property.IsDefined(typeof(OccurAttribute), false))
{
setValue(searchResult, Preview(value, keyword));
}
else
{
setValue(searchResult, value);
}
}
}
list.Add(searchResult);
}
return(list);
}
}
