无法将类型“System.Collections.Generic.IEnumerable”隐式转换为“System.Collections.Generic.List”

我有下面的代码：

List<string> aa = (from char c in source
                   select new { Data = c.ToString() }).ToList();

但是关于

List<string> aa = (from char c1 in source
                   from char c2 in source
                   select new { Data = string.Concat(c1, ".", c2)).ToList<string>();

编译时出现错误

无法隐式转换类型'System.Collections.Generic.List<AnonymousType#1>' to 'System.Collections.Generic.List<string>'

需要帮忙。

IEnumerable<string> e = (from char c in source
                        select new { Data = c.ToString() }).Select(t = > t.Data);
// or
IEnumerable<string> e = from char c in source
                        select c.ToString();
// or
IEnumerable<string> e = source.Select(c = > c.ToString());

然后你可以打电话ToList():

List<string> l = (from char c in source
                  select new { Data = c.ToString() }).Select(t = > t.Data).ToList();
// or
List<string> l = (from char c in source
                  select c.ToString()).ToList();
// or
List<string> l = source.Select(c = > c.ToString()).ToList();