.net - 对从 MongoDB 获取的数据库列表进行排序

Question

尝试编码

Client = new MongoClient($"mongodb://{connectionParameters}");

List<dynamic> names = Client.ListDatabases().ToList()
      .Select(x => new { name = x["name"].ToString() })
      .OrderBy(x => x.name)
      ;

但是编译器显示错误

Cannot implicitly convert type
'System.Linq.IOrderedEnumerable<>'
to
'System.Collections.Generic.List'.

An explicit conversion exists (are you missing a cast?)

不确定补救措施是什么。

也试过

List<string> names = Client.ListDatabases().ToList()
    .Select(x => x["name"].ToString())
    ;

但也有错误

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'. An explicit conversion exists (are you missing a cast?)

Answer 1

如果您查看 OrderBy 的文档你会看到它返回:

IOrderedEnumerable<TSource>

但您希望它是一个 List , 所以你只需要最后一次调用 ToList()最后

List<dynamic> names = Client.ListDatabases().ToList()
      .Select(x => new { name = x["name"].ToString() })
      .OrderBy(x => x.name)
      .ToList();