Question

我正在开发winforms应用程序。我想在ListView上应用过滤器。当在文件夹中搜索具有给定名称的文件时，要求是在窗口中实现精确搜索功能。

事实证明，Windows正在使用Relevance Values订购找到的文件。

我在想，也许winforms在一个Control或另一个Control中实现了这个算法？或者也许.NET有一些在哪里？如果没有，是否有可用于手动订购过滤对象的此算法的C＃代码：

var searchFor = "search";
var newList = oldList.Select(x =>x.Contains(searchFor))
                     .OrderBy(x => RelevanceValues(x,searchFor))
                     .ToList();

Answer 1

以下是实现此目的的示例。此示例包含“按文件列出的相关值排序”。

CODE：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;    

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        // textBox1 for search string
        private System.Windows.Forms.TextBox textBox1;
        // listView1 for show result
        private System.Windows.Forms.ListView listView1;
        private System.Windows.Forms.Button button1; 

        public Form1()
        {
            InitializeComponent();
        }   

        class MyListViewItem : ListViewItem
        {
            public int Index { get; set; }
        }  

        private void button1_Click(object sender, EventArgs e)
        {
            List<MyListViewItem> myList = new List<MyListViewItem>();

            // open folder browser to get folder path    
            FolderBrowserDialog result = new FolderBrowserDialog();
            if (result.ShowDialog() == DialogResult.OK)
            {
                // get all file list
                string[] files = Directory.GetFiles(result.SelectedPath);
                foreach (string item in files)
                {
                    // find the relevance value based on search string
                    int count = Regex.Matches(Regex.Escape(item.ToLower()), textBox1.Text.ToLower()).Count;
                    myList.Add(new MyListViewItem() { Text = item, Index = count });
                }
            }

            List<ListViewItem> list = new List<ListViewItem>();
            // add file name in final list with order by relevance value
            foreach (var item in myList.OrderByDescending(m => m.Index).ToList())
            {
                list.Add(new ListViewItem() { Text = item.Text });
            }

            listView1.Items.AddRange(list.ToArray());
        }
    }
}

Answer 2

您可以使用LINQ和Regex按相关性值进行搜索和排序。请尝试以下代码：

var searchFor = "search";    
var newList = oldList.Select(l => new
        {
            SearchResult = l,
            RelevanceValue = (Regex.Matches(Regex.Escape(l.Text.ToLower()), searchFor.ToLower()).Count)
        })
            .OrderByDescending(r => r.RelevanceValue)
            .Select(r => r.SearchResult);

排序依据＆＃34;相关值＆＃34;

2 个答案: