C#如何求两个List字典类型数据的交集

要求两个List中字典类型数据的交集，可以使用LINQ查询语句和Intersect方法来实现。以下是一个示例代码：

using System;
    
using System.Collections.Generic;
    
using System.Linq;


class Program
{

    static void Main()
    {
    
        ListDictionarystring, string>
    >
     list1 = new ListDictionarystring, string>
    >

        {
    
            new Dictionarystring, string>
 {
 {
 "key1", "value1" }
, {
 "key2", "value2" }
 }
    ,
            new Dictionarystring, string>
 {
 {
 "key3", "value3" }
, {
 "key4", "value4" }
 }

        }
    ;
    

        ListDictionarystring, string>
    >
     list2 = new ListDictionarystring, string>
    >

        {
    
            new Dictionarystring, string>
 {
 {
 "key1", "value1" }
, {
 "key2", "value2" }
 }
    ,
            new Dictionarystring, string>
 {
 {
 "key5", "value5" }
, {
 "key6", "value6" }
 }

        }
    ;
    

        var intersected = list1.Intersect(list2, new DictionaryComparer());


        foreach (var item in intersected)
        {

            foreach (var pair in item)
            {

                Console.WriteLine($"{
pair.Key}
: {
pair.Value}
    ");

            }

        }

    }
    

    class DictionaryComparer : IEqualityComparerDictionarystring, string>
    >

    {
    
        public bool Equals(Dictionarystring, string>
     x, Dictionarystring, string>
 y)
        {
    
            if (x.Count != y.Count)
                return false;


            foreach (var pair in x)
            {
    
                if (!y.ContainsKey(pair.Key) || y[pair.Key] != pair.Value)
                    return false;

            }
    

            return true;

        }
    

        public int GetHashCode(Dictionarystring, string>
 obj)
        {
    
            int hash = 17;

            foreach (var pair in obj)
            {
    
                hash = hash * 23 + pair.Key.GetHashCode() + pair.Value.GetHashCode();

            }
    
            return hash;

        }

    }

}
    

在上面的示例中，我们定义了一个DictionaryComparer类来实现IEqualityComparer接口，用于比较两个字典类型数据是否相等。然后我们使用Intersect方法来获取两个List中的交集数据，并输出结果。

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