如何从两个列表中删除重复记录？ [英] How To Delete Duplicate Records From Two Lists ?

问题描述

类 - >

Class-->

public class DocumentsLists
   {
       public int DocumentId { get; set; }
       public string DocumentName { get; set; }
   }

列表 - >

List-->

var ChkDocumentData = new List<documentslists>();
var AppDocData = new List<documentslists>();

两个列表的内容 - & gt;



ChkDocumentData包含：

Contents of two list-->

ChkDocumentData contains:

 {
   {DocumentId = 42, DocumentName ="Passport"},
   {DocumentId = 44, DocumentName ="Adhar Card"},
   {DocumentId = 45, DocumentName ="Driving License"},
   {DocumentId = 46, DocumentName ="Voter ICard"}
};

AppDocData包含：

AppDocData contains :

{DocumentId = 44, DocumentName ="Adhar Card"};

< br $>


我想要一个包含的列表：

I want a list Contains :

{
   {DocumentId = 42, DocumentName ="Passport"},
   {DocumentId = 45, DocumentName ="Driving License"},
   {DocumentId = 46, DocumentName ="Voter ICard"}
};

提前致谢

Thanks in advance

推荐答案

看到： https://msdn.microsoft.com/en-us/library /vstudio/bb300779(v=vs.100).aspx [ ^ ]



另一种方式

See this : https://msdn.microsoft.com/en-us/library/vstudio/bb300779(v=vs.100).aspx[^]

Another way

var result = ChkDocumentData.Where(x => !AppDocData.Any(y => x.DocumentId == y.DocumentId));

参考： http：/ /stackoverflow.com/a/5636511 [ ^ ]



问候..

Reference : http://stackoverflow.com/a/5636511[^]

Regards..

试试这个，

Try this,

var result = ChkDocumentData.Where(c => !AppDocData.Any(a => a.DocumentId == c.DocumentId)).ToList();

-KR

-KR

作为 Rohan Leuva [ ^ ]，最简单的方法是使用除方法：

As Rohan Leuva[^] mentioned, the simplest way is to use Except method:

var resultList = ChkDocumentData.Except(AppDocData);

Sergey Alexandrovich Kryukov [ ^ ]建议在问题的评论中，你可以使用包含 [ ^ ]在向列表添加数据的过程中避免重复的方法。

As Sergey Alexandrovich Kryukov[^] suggests in the comment to the question, you can use Contains[^] method to avoid duplicates during the process of adding data to the list.

if(!ChkDocumentData.Contains(SomeDocument))
{
    ChkDocumentData.Add(SomeDocument);
}

但最好的方法是创建自定义类集合并提供可以处理此类功能的Add方法（避免一式两份）。请参阅：演练：创建自己的收藏类 [ ^ ]

But the best way is to create custom class collection and provide Add method which can handle such of functionality (avoiding duplicates). See: Walkthrough: Creating Your Own Collection Class[^]

public class DocumentsCollection : CollectionBase
{
   public void Add(DocumentList dl)
    {
        if (!List.Contains(dl))
        {
             List.Add(dl);
        }
    }
}

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