我有一个嵌套字典,我想从中派生一个查找。字典的示例数据如下:
var binary_transaction_model = new Dictionary<string, Dictionary<string, bool>>();
binary_transaction_model.Add("123", new Dictionary<string, bool>(){{"829L", false},{"830L", true}});
binary_transaction_model.Add("456", new Dictionary<string, bool>(){{"829L", true},{"830L", false}});
binary_transaction_model.Add("789", new Dictionary<string, bool>(){{"829L", true},{"830L", true}});
此 LINQ 语句正在工作:
var cols = from a in binary_transaction_model
from b in a.Value
where b.Value == true
group a.Key by b.Key;
它给了我一个IEnumerable<IGrouping<String,String>>
. 出于查找目的,我需要将此结果作为查找数据结构。我怎样才能做到这一点?签名应该是ToLookup()
什么样子的?(编辑:我想要一个Lookup<String,String>
。)