C#Winform开发，Listview根据文件路径或扩展名显示系统文件图标 |
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C#Winform开发，Listview根据文件路径或扩展名显示系统文件图标
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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 /// /// Contains information about a file object. /// struct SHFILEINFO { /// /// Handle to the icon that represents the file. You are responsible for /// destroying this handle with DestroyIcon when you no longer need it. /// public IntPtr hIcon; /// /// Index of the icon image within the system image list. /// public IntPtr iIcon; /// /// Array of values that indicates the attributes of the file object. /// For information about these values, see the IShel |
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