你也可以試試這個,字典表示文檔的ID與它的標籤:
Dictionary<int, string[]> documents =
new Dictionary<int, string[]>();
documents.Add(1, new string[] { "C#", "SQL", "EF" });
documents.Add(2, new string[] { "C#", "Interop" });
documents.Add(3, new string[] { "Javascript", "ASP.NET" });
documents.Add(4, new string[] { });
// returns tags belonging to documents with IDs 1, 2
string[] filterTags = new string[] { "C#" };
var relatedTags = GetRelatedTags(documents, filterTags);
Debug.WriteLine(string.Join(",", relatedTags));
// returns tags belonging to document with ID 1
filterTags = new string[] { "C#", "SQL" };
relatedTags = GetRelatedTags(documents, filterTags);
Debug.WriteLine(string.Join(",", relatedTags));
// returns tags belonging to all documents
// since no filtering tags are specified
filterTags = new string[] { };
relatedTags = GetRelatedTags(documents, filterTags);
Debug.WriteLine(string.Join(",", relatedTags));
public static string[] GetRelatedTags(
Dictionary<int, string[]> documents,
string[] filterTags)
{
var documentsWithFilterTags = documents.Where(o =>
filterTags
.Intersect(o.Value).Count() == filterTags.Length);
string[] relatedTags = new string[0];
foreach (string[] tags in documentsWithFilterTags.Select(o => o.Value))
relatedTags = relatedTags
.Concat(tags)
.Distinct()
.ToArray();
return relatedTags;
}
非常感謝,我會給它一個。 – 2012-07-18 06:11:05
如果不是字符串,我會從標籤中傳入ID,會更容易嗎? – 2012-07-18 06:27:58
是的,你可以在那裏傳遞ID,Ids會在數據庫查詢中完成預製。 – 2012-07-18 06:41:06