c# - C# 字典过滤 (LINQ) 和列表扩展方法过滤值并获取密钥

Question

我有一本字典fooDictionary<string, MyObject>。

我正在过滤fooDictionary以仅获取具有特定属性值的 MyObject 。

fooDictionary.Values.Where(x=>x.Boo==false).ToList().ExtensionMethod();

//（扩展方法是我为列表制作的扩展方法（用于更多过滤）（PS：ExtensionMethod仅返回1x MyObject））但我也想获取已经过滤的MyObject的键。我怎样才能做到这一点？

标签： c#linqdictionary

Answer 1

When you operate on the dictionary values with fooDictionary.Values.Where(...), you no longer have access to the keys.

instead change the query to:

fooDictionary.Where(x => x.Value.Boo == false).ToList().ExtensionMethod();

After the ToList() call, this should yield a List<KeyValuePair<string, MyObject>> hence maintaining both the key as well as the corresponding value.