C#Winform开发，Listview根据文件路径或扩展名显示系统文件图标

最新推荐文章于 2025-05-15 14:46:05 发布

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最新推荐文章于 2025-05-15 14:46:05 发布 · 5.7k 阅读

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#c# #listview

在C# Winform开发中，为了在Listview中显示系统文件图标，需要借助Icon和Imagelist。首先实例化Imagelist，然后通过文件路径获取系统图标并添加到Imagelist，设置Listview View为SmallIcon，并根据文件路径或扩展名获取图标索引。对于只有扩展名的情况，需要自定义类来获取对应图标。

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在Winform开发中，大家普遍利用Listview来显示文件列表。但是Listview本身并不具备显示当前系统图标的功能。所以要想实现类似的功能，需要利用Icon和Imagelist来辅助。

1，实例一个imagelist作为图标管理容器。

2，根据文件绝对路径将对应的系统图标加入imagelist

3，将listview的显示属性View修改为：SmallIcon

4，获取对应图标的index 并赋值给ListViewItem

源代码如下：

using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace ListViewDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            listView1.Items.Clear();
            string DemoFolder = "c:\\listview";
            DirectoryInfo  di = new DirectoryInfo(DemoFolder);
            //get all fileinfo in the demo folder
            foreach (FileInfo f in di.GetFiles())
            {
                //add system icon of current file into imagelist
                if (!imageList1.Images.Keys.Contains(f.Extension))
                {
                    imageList1.Images.Add(f.Extension, Icon.ExtractAssociatedIcon(f.FullName));
                }

                ListViewItem lvi = new ListViewItem();
                lvi.Text = f.Name;
                //get imageindex from imagelist according to the file extension
                lvi.ImageIndex = imageList1.Images.Keys.IndexOf(f.Extension);
                listView1.Items.Add(lvi);
            }
        }
    }
}

效果图：

对于一些非当前系统中的文件，如果没有文件绝对路径，只知道文件扩展名，就需要再添加一个自定义的类。根据文件扩展名来获取对应的图标。

1，获取文件扩展名，

2，根据文件扩展名来获取系统图标，

3，将listview的显示属性View修改为：SmallIcon

4，获取对应图标的index 并赋值给ListViewItem

首先是自定义的类：

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Reflection;
using System.Collections.Generic;

namespace ALM_Resource_Sync.Lib
{
    public static class Icons
    {
        #region Custom exceptions class

        public class IconNotFoundException : Exception
        {
            public IconNotFoundException(string fileName, int index)
                : base(string.Format("Icon with Id = {0} wasn't found in file {1}", index, fileName))
            {
            }
        }

        public class UnableToExtractIconsException : Exception
        {
            public UnableToExtractIconsException(string fileName, int firstIconIndex, int iconCount)
                : base(string.Format("Tryed to extract {2} icons starting from the one with id {1} from the \"{0}\" file but failed", fileName, firstIconIndex, iconCount))
            {
            }
        }

        #endregion

        #region DllImports

        /// <summary>
        /// Contains information about a file object. 
        /// </summary>
        struct SHFILEINFO
        {
            /// <summary>
            /// Handle to the icon that represents the file. You are responsible for
            /// destroying this handle with DestroyIcon when you no longer need it. 
            /// </summary>
            public IntPtr hIcon;

            /// <summary>
            /// Index of the icon image within the system image list.
            /// </summary>
            public IntPtr iIcon;

            /// <summary>
            /// Array of values that indicates the attributes of the file object.
            /// For information about these values, see the IShellFolder::GetAttributesOf