从字典列表中提取记录，其中键和值不包含给定值列表c#

Question

List<Dictionary<string, string>> firstList = new List<Dictionary<string, string>>();   
Dictionary<string, string> dict = new Dictionary<string,string>();
dict.Add("name", "abc");
dict.Add("age", "22");
dict.Add("address", "xyz,aa");
dict.Add("contact", "111");
firstList .Add(dict);
Dictionary<string, string> dict2 = new Dictionary<string,string>();
dict2 .Add("name", "pqr");
dict2 .Add("age", "25");
dict2 .Add("address", "xxx,bb");
dict2 .Add("contact", "4222");
firstList .Add(dict2);
Dictionary<string, string> dict3 = new Dictionary<string,string>();
dict3 .Add("name", "aa");
dict3 .Add("age", "24");
dict3 .Add("address", "xxx,aa");
dict3 .Add("contact", "aaa");
firstList .Add(dict3);

返回列表不包含 key = 'address' 和 name= 'aa' 的记录

更新：- 返回记录，其中 name='aa'

Answer 1

使用 linq 非常简单：

var result = firstList.Where(x => !(x.ContainsKey("address") 
                                && x.ContainsKey(name)
                                && x["name"] == "aa")).ToList();

如果只需要一条记录，则使用FirstOrDefault():

var result = firstList.Where(x => !(x.ContainsKey("address") 
                                && x.ContainsKey(name)
                                && x["name"] == "aa")).FirstOrDefault();

别忘了加在上面：

using System.Linq;

UDPATE：

var result = firstList.Where(x => 
                                && x.ContainsKey(name)
                                && x["name"] != "aa")).FirstOrDefault();