如何从嵌套字典中获取Lookup

本文关键字：获取 Lookup 字典 嵌套 | 更新日期: 2023-09-27 18:13:16

我有一个嵌套的字典，我想从中派生一个Lookup。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}});

这个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;

它给我一个IEnumerable<IGrouping<String,String>>。出于查找目的，我需要将此结果作为lookup数据结构。我该怎么做呢?ToLookup()签名应该是什么样的?(编辑:我想Lookup<String,String>。

如何从嵌套字典中获取Lookup

应该可以:

var cols = (from a in binary_transaction_model
            from b in a.Value
            where b.Value == true
            select new { aKey = a.Key, bKey = b.Key })
            .ToLookup(x => x.bKey, x => x.aKey);
相关文章：