{"id":1243,"date":"2025-01-25T23:49:58","date_gmt":"2025-01-25T15:49:58","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1243"},"modified":"2025-01-25T23:49:59","modified_gmt":"2025-01-25T15:49:59","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-net-%e4%b8%ad%e4%bd%bf%e7%94%a8-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e8%8e%b7%e5%8f%96%e4%b8%8d%e5%90%8c%e7%9a%84%e5%80%bc%ef%bc%9a%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/01\/25\/%e5%a6%82%e4%bd%95%e5%9c%a8-net-%e4%b8%ad%e4%bd%bf%e7%94%a8-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e8%8e%b7%e5%8f%96%e4%b8%8d%e5%90%8c%e7%9a%84%e5%80%bc%ef%bc%9a%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5\/","title":{"rendered":"\u5982\u4f55\u5728 .NET \u4e2d\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u83b7\u53d6\u4e0d\u540c\u7684\u503c\uff1a\u6700\u4f73\u5b9e\u8df5\u4e0e\u793a\u4f8b"},"content":{"rendered":"\n

\u5728 .NET \u4e2d\uff0c\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u901a\u8fc7\u4e0d\u540c\u7684\u65b9\u5f0f\u83b7\u53d6\u548c\u5904\u7406\u96c6\u5408\u4e2d\u7684\u503c\u3002Lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u533f\u540d\u65b9\u6cd5\u8868\u793a\u6cd5\uff0c\u901a\u5e38\u7528\u4e8e LINQ \u67e5\u8be2\u548c\u59d4\u6258\uff0c\u80fd\u591f\u975e\u5e38\u7075\u6d3b\u5730\u5bf9\u6570\u636e\u8fdb\u884c\u8fc7\u6ee4\u3001\u6620\u5c04\u3001\u6392\u5e8f\u3001\u805a\u5408\u7b49\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\u83b7\u53d6\u4e0d\u540c\u7684\u503c<\/h3>\n\n\n\n
    \n
  1. \u4ece\u96c6\u5408\u4e2d\u8fc7\u6ee4\u552f\u4e00\u503c<\/strong>\uff1a
    \u5047\u8bbe\u4f60\u6709\u4e00\u4e2a\u96c6\u5408\uff0c\u5e76\u5e0c\u671b\u4ece\u4e2d\u83b7\u53d6\u4e0d\u540c\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 Distinct()<\/code> \u65b9\u6cd5\u7ed3\u5408 Lambda \u8868\u8fbe\u5f0f\u6765\u5b9e\u73b0\u3002 \u793a\u4f8b\uff1a<\/li>\n<\/ol>\n\n\n\n
       using System;\n   using System.Linq;\n   using System.Collections.Generic;\n\n   public class Program\n   {\n       public static void Main()\n       {\n           var numbers = new List<int> { 1, 2, 2, 3, 4, 4, 5 };\n\n           \/\/ \u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u548c Distinct \u83b7\u53d6\u4e0d\u540c\u7684\u6570\u5b57\n           var distinctNumbers = numbers.Distinct().ToList();\n\n           foreach (var number in distinctNumbers)\n           {\n               Console.WriteLine(number);\n           }\n       }\n   }<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
       1\n   2\n   3\n   4\n   5<\/code><\/pre>\n\n\n\n
      \n
    1. \u901a\u8fc7 Lambda \u83b7\u53d6\u4e0d\u540c\u7684\u5c5e\u6027\u503c<\/strong>\uff1a
      \u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5bf9\u8c61\u5217\u8868\uff0c\u5e76\u4e14\u60f3\u8981\u83b7\u53d6\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u7684\u552f\u4e00\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 DistinctBy<\/code>\uff08\u9700\u8981\u5f15\u7528 System.Linq<\/code> \u6269\u5c55\u5e93\uff09\u6765\u5b9e\u73b0\u3002 \u793a\u4f8b\uff1a<\/li>\n<\/ol>\n\n\n\n
         using System;\n   using System.Linq;\n   using System.Collections.Generic;\n\n   public class Person\n   {\n       public string Name { get; set; }\n       public int Age { get; set; }\n   }\n\n   public class Program\n   {\n       public static void Main()\n       {\n           var people = new List<Person>\n           {\n               new Person { Name = \"Alice\", Age = 25 },\n               new Person { Name = \"Bob\", Age = 30 },\n               new Person { Name = \"Alice\", Age = 25 },\n               new Person { Name = \"Charlie\", Age = 35 }\n           };\n\n           \/\/ \u83b7\u53d6\u552f\u4e00\u7684 Name \u503c\n           var distinctNames = people\n               .Select(p => p.Name)\n               .Distinct()\n               .ToList();\n\n           foreach (var name in distinctNames)\n           {\n               Console.WriteLine(name);\n           }\n       }\n   }<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
         Alice\n   Bob\n   Charlie<\/code><\/pre>\n\n\n\n
        \n
      1. \u83b7\u53d6\u591a\u4e2a\u6761\u4ef6\u4e0b\u7684\u4e0d\u540c\u503c<\/strong>\uff1a
        \u5982\u679c\u8981\u83b7\u53d6\u57fa\u4e8e\u591a\u4e2a\u6761\u4ef6\u7684\u552f\u4e00\u503c\uff08\u4f8b\u5982\u6839\u636e\u591a\u4e2a\u5c5e\u6027\u6765\u5224\u65ad\u552f\u4e00\u6027\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528 GroupBy()<\/code> \u914d\u5408 Lambda \u8868\u8fbe\u5f0f\u6765\u83b7\u53d6\u5206\u7ec4\u540e\u7684\u552f\u4e00\u503c\u3002 \u793a\u4f8b\uff1a<\/li>\n<\/ol>\n\n\n\n
           using System;\n   using System.Linq;\n   using System.Collections.Generic;\n\n   public class Person\n   {\n       public string Name { get; set; }\n       public int Age { get; set; }\n   }\n\n   public class Program\n   {\n       public static void Main()\n       {\n           var people = new List<Person>\n           {\n               new Person { Name = \"Alice\", Age = 25 },\n               new Person { Name = \"Bob\", Age = 30 },\n               new Person { Name = \"Alice\", Age = 30 },\n               new Person { Name = \"Charlie\", Age = 35 }\n           };\n\n           \/\/ \u6839\u636e Name \u548c Age \u83b7\u53d6\u4e0d\u540c\u7684\u503c\n           var uniquePeople = people\n               .GroupBy(p => new { p.Name, p.Age })\n               .Select(g => g.First())\n               .ToList();\n\n           foreach (var person in uniquePeople)\n           {\n               Console.WriteLine($\"{person.Name} - {person.Age}\");\n           }\n       }\n   }<\/code><\/pre>\n\n\n\n
        \u8f93\u51fa\uff1a<\/p>\n\n\n\n
           Alice - 25\n   Bob - 30\n   Alice - 30\n   Charlie - 35<\/code><\/pre>\n\n\n\n
        \u603b\u7ed3\uff1a<\/h3>\n\n\n\n
          \n
        • \u4f7f\u7528 Distinct()<\/code> \u53ef\u4ee5\u4ece\u96c6\u5408\u4e2d\u53bb\u9664\u91cd\u590d\u7684\u5143\u7d20\uff0c\u83b7\u53d6\u4e0d\u540c\u7684\u503c\u3002<\/li>\n\n\n\n
        • \u4f7f\u7528 DistinctBy()<\/code> \u53ef\u4ee5\u6839\u636e\u5bf9\u8c61\u7684\u67d0\u4e2a\u6216\u591a\u4e2a\u5c5e\u6027\u83b7\u53d6\u552f\u4e00\u7684\u503c\uff08\u5982\u679c .NET \u7248\u672c\u652f\u6301\uff09\u3002<\/li>\n\n\n\n
        • GroupBy()<\/code> \u53ef\u4ee5\u7528\u4e8e\u591a\u4e2a\u6761\u4ef6\u7684\u552f\u4e00\u503c\u83b7\u53d6\uff0c\u9002\u7528\u4e8e\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\u3002<\/li>\n<\/ul>\n\n\n\n
          Lambda \u8868\u8fbe\u5f0f\u8ba9\u8fd9\u4e9b\u64cd\u4f5c\u66f4\u52a0\u7b80\u6d01\u548c\u6613\u8bfb\uff0c\u540c\u65f6\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          \u5728 .NET \u4e2d\uff0c\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u901a\u8fc7\u4e0d\u540c\u7684\u65b9\u5f0f\u83b7\u53d6\u548c\u5904\u7406\u96c6\u5408\u4e2d\u7684\u503c\u3002Lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[],"class_list":["post-1243","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1243","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=1243"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1243\/revisions"}],"predecessor-version":[{"id":1244,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1243\/revisions\/1244"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}