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  • Linq Grop by

     1 using System;
     2 using System.Collections.Generic;
     3 using System.Linq;
     4 
     5 public class Program
     6 {
     7   public static void Main()
     8   {
     9     var inputDtos = new List<Dto>(){
    10     new Dto{ fname = "11", lname = "12", age = "13", gender = "1"},
    11 new Dto{ fname = "", lname = "12", age = "13", gender = "1"},
    12 new Dto{ fname = null, lname = "12", age = "13", gender = "1"},
    13 new Dto{ fname = "11", lname = "", age = "13", gender = "1"},
    14 new Dto{ fname = "11", lname = null, age = "13", gender = "1"},
    15 new Dto{ fname = "11", lname = "12", age = "", gender = "1"},
    16 new Dto{ fname = "11", lname = "12", age = null, gender = "1"},
    17 new Dto{ fname = "11", lname = "12", age = "13", gender = ""},
    18 new Dto{ fname = "11", lname = "12", age = "13", gender = null},
    19 
    20 new Dto{ fname = "11", lname = "12", age = "13", gender = "1"},
    21 new Dto{ fname = "21", lname = "22", age = "23", gender = "0"},
    22 new Dto{ fname = "21", lname = "22", age = "23", gender = "0"},
    23 
    24 
    25 };
    26                      var DuplicateList = (from d in inputDtos
    27                                          group d by  
    28                                          new
    29                                         {
    30                                             firstName = TrimValueSpace(d.fname),
    31                                             lastName = TrimValueSpace(d.lname),
    32                                             birthday = TrimValueSpace(d.age),
    33                                             gender = TrimValueSpace(d.gender)
    34                                         }
    35                         into gr
    36                                          where gr.Count() > 1
    37                                                && !string.IsNullOrWhiteSpace(gr.Key.firstName)
    38                                                && !string.IsNullOrWhiteSpace(gr.Key.lastName)
    39                                                && !string.IsNullOrWhiteSpace(gr.Key.birthday)
    40                                                && !string.IsNullOrWhiteSpace(gr.Key.gender)
    41                                          select gr.Key).ToList();
    42 
    43 if (DuplicateList != null )
    44                         {
    45           Console.WriteLine("ok  --- " + DuplicateList.Count);
    46 
    47                         }
    48                         var sfdfd = "222";
    49 
    50           Console.WriteLine(sfdfd ?? "0");
    51 
    52 
    53   }
    54 
    55         private static string TrimValueSpace(string value)
    56         {
    57             if (string.IsNullOrWhiteSpace(value))
    58             {
    59                 return string.Empty;
    60             }
    61             else
    62             {
    63                 return value.Replace(" ", string.Empty).Replace(" ", string.Empty);
    64             }
    65         }
    66   
    67 }
    68 public class Dto{
    69     public string fname {get; set;}
    70     public string lname {get; set;}
    71     public string age{get; set;}
    72     public string gender{get; set;}
    73   }
    View Code
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  • 原文地址:https://www.cnblogs.com/RocCnBlog/p/11176534.html
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