C# - 如何使用 Linq 和 Regex 从单个字符串实现多个匹配

本文关键字：实现 字符串 单个 何使用 Linq Regex | 更新日期: 2023-09-27 18:31:30

我有一个字符串，如下所示：var str = "My name is John, her name is Fonda and his name is Donald"

我在可枚举集合中有 3 个对象，例如：

var boy = new Person({name="John"});
var girl = new Person({name="Fonda"});
var son = new Person({name="Donald"});
new other = new Person({name="Mike"});
new other2 = new Person({name="Roger"});

假设resultSet包含上述所有对象。

var resultSet = new IEnumerable<Person>();

这是我的问题：

我想对该集进行 Linq 查询，以返回所有匹配的对象（如果它们在给定字符串中）。

我认为这很可能通过使用正则表达式来实现，但我不知道如何：S

提前感谢！

C# - 如何使用 Linq 和 Regex 从单个字符串实现多个匹配

您可以使用Contains方法：

var str = "My name is John, her name is Fonda and his name is Donald";
var result= resultSet.Where(p=>str.Contains(p.name));

如果要避免部分结果，可以将Split应用于句子，并使用扩展方法执行以下查询Any：

var str = "My name is John, her name is Fonda and his name is Donald";
var strArray= str.Split( new [] {' ', ','});
var result= resultSet.Where(p=>strArray.Any(s=>s==p.name));
您可以使用

LINQ 解决它：

var str = "My name is John, her name is Fonda and his name is Donald";
var strs = str.Split(new char[] {' ', ','}); //note the comma here is needed to get "John"
var names = from p in resultSet
            where strs.Contains(p.name)
            select p.name; //or select p if you need the "Person"

注意：最重要的是，在此处使用Contains和where

试试这个

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Person> people = new List<Person>();
            var boy = new Person() {name="John"};
            var girl = new Person() {name="Fonda"};
            var son = new Person() {name="Donald"};
            var other = new Person() {name="Mike"};
            var  other2 = new Person(){name="Roger"};
            people.AddRange(new Person[] { boy, girl, son, other, other2 });
            string str = "My name is John, her name is Fonda and his name is Donald";
            string[] peopleInSentenance = people.Where(x => str.Contains(x.name)).Select(y => y.name).ToArray();
       }
    }
    public class Person
    {
        public string name { get; set; }
    }
}
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