将列表添加到实例化C＃的另一个列表中

Question

如何将列表添加到另一个列表？也许我以错误的方式提出要求，但请耐心等待一分钟。我有一个KeyValuePair<string, object>的列表，我想向该列表中添加另一个列表成员。像这样：

var list = new List<KeyValuePair<string, object>>{ new KeyValuePair<string, object>("Screw", "1"),
                                                   new KeyValuePair<string, object>("You", "2"),
                                                   new KeyValuePair<string, object>("Guys", "3")};

var secondList = new List<KeyValuePair<string, object>>{ list, // through error
                                                         new KeyValuePair<string, object>("I'm", "4"),
                                                         new KeyValuePair<string, object>("Going", "5"), 
                                                         new KeyValuePair<string, object>("Home", "6") };

您可以猜到，错误是

无法从'System.Collections.Generic.List >'转换为'System.Collections.Generic.KeyValuePair '

对我来说，在list的实例化中向secondList添加secondList很重要。那我该如何实现呢？

Answer 1

Concat和ToList LINQ方法：

var secondList = list.Concat(new List<KeyValuePair<string, object>>{
                                                     new KeyValuePair<string, object>("I'm", "4"),
                                                     new KeyValuePair<string, object>("Going", "5"), 
                                                     new KeyValuePair<string, object>("Home", "6") }).ToList();

Answer 2

使用AddRange方法System.Collections.Generic

   secondList.AddRange(list)

或者只是使用foreach并自行完成

foreach(var item in list)
{
secondList.Add(item)
}