Dictionary

从字典（DicRoleForScope）中查询对应（role）的值再赋值给其他变量（ DicSelectedRoleForScope）

Dictionary<string, object> dic = DicRoleForScope.Where(s => s.Value.ToString().Contains(role)).
Select(q => new { q.Key, q.Value }).
ToList().AsEnumerable().ToDictionary(d => d.Key, d => (object)d.Value); // where对比中使用Contains

KeyValuePair<string, object> kvp = dic.FirstOrDefault();

if (kvp.Key != null && kvp.Value != null) //注意判断为空否
{
DicSelectedRoleForScope.Add(kvp.Key, kvp.Value); //Dictionary只能以键值对的形式添加
}