C# 从数组中选择不同的名称

发布于 2024-10-03 18:21:22 字数 672 浏览 8 评论 0原文

我想知道如何从数组中仅选择不同的名称。我所做的是从包含许多不相关信息的文本文件中读取。我当前代码的输出结果是一个名称列表。我只想从文本文件中选择每个名称中的 1 个。

以下是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace Testing
{
class Program
{
    public static void Main(string[] args)
    {
        String[] lines = File.ReadLines("C:\\Users\\Aaron\\Desktop\\hello.txt").ToArray();

        foreach (String r in lines)
        {
            if (r.StartsWith("User Name"))
            {
                String[] token = r.Split(' ');
                Console.WriteLine(token[11]);
            }
        }
    }
}
}

原文

I would like to know how to select only the distinct names from an array.
What I did was to read from a text file which contains many irrelevant information.
My output results for my current codes is a list of names. I want to select only 1 of each name from the text file.

Following are my codes:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace Testing
{
class Program
{
    public static void Main(string[] args)
    {
        String[] lines = File.ReadLines("C:\\Users\\Aaron\\Desktop\\hello.txt").ToArray();

        foreach (String r in lines)
        {
            if (r.StartsWith("User Name"))
            {
                String[] token = r.Split(' ');
                Console.WriteLine(token[11]);
            }
        }
    }
}
}

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给妤﹃绝世温柔 2024-10-10 18:21:22

好吧，如果您像这样阅读它们，您可以随时将它们添加到 HashSet 中（假设是 .NET 3.5）：

HashSet<string> names = new HashSet<string>();
foreach (String r in lines)
{
    if (r.StartsWith("User Name"))
    {
        String[] token = r.Split(' ');
        string name = token[11];
        if (names.Add(name))
        {
            Console.WriteLine(name);
        }
    }
}

或者，将您的代码视为 LINQ 查询：

var distinctNames = (from line in lines
                     where line.StartsWith("User Name")
                     select line.Split(' ')[11])
                    .Distinct();
foreach (string name in distinctNames)
{
    Console.WriteLine(name);
}

Well, if you're reading them like this you could just add them to a HashSet<string> as you go (assuming .NET 3.5):

HashSet<string> names = new HashSet<string>();
foreach (String r in lines)
{
    if (r.StartsWith("User Name"))
    {
        String[] token = r.Split(' ');
        string name = token[11];
        if (names.Add(name))
        {
            Console.WriteLine(name);
        }
    }
}

Alternatively, think of your code as a LINQ query:

var distinctNames = (from line in lines
                     where line.StartsWith("User Name")
                     select line.Split(' ')[11])
                    .Distinct();
foreach (string name in distinctNames)
{
    Console.WriteLine(name);
}

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