如何：提取与文件关联的图标 |
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如何：提取与 Windows 窗体中的文件关联的图标
项目05/04/2023
许多文件都有嵌入的图标，提供关联文件类型的可视表示形式。 例如，Microsoft Word 文档包含一个图标，用于将其标识为 Word 文档。 在列表控件或表控件中显示文件时，你可能希望在每个文件名旁边显示表示文件类型的图标。 可以使用 ExtractAssociatedIcon 方法轻松执行此操作。 示例下面的代码示例演示如何提取与文件关联的图标，并在 ListView 控件中显示文件名及其关联图标。 ListView listView1; ImageList imageList1; public void ExtractAssociatedIconEx() { // Initialize the ListView, ImageList and Form. listView1 = new ListView(); imageList1 = new ImageList(); listView1.Location = new Point(37, 12); listView1.Size = new Size(151, 262); listView1.SmallImageList = imageList1; listView1.View = View.SmallIcon; this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.listView1); this.Text = "Form1"; // Get the c:\ directory. System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(@"c:\"); ListViewItem item; listView1.BeginUpdate(); // For each file in the c:\ directory, create a ListViewItem // and set the icon to the icon extracted from the file. foreach (System.IO.FileInfo file in dir.GetFiles()) { // Set a default icon for the file. Icon iconForFile = SystemIcons.WinLogo; item = new ListViewItem(file.Name, 1); // Check to see if the image collection contains an image // for this extension, using the extension as a key. if (!imageList1.Images.ContainsKey(file.Extension)) { // If not, add the image to the image list. iconForFile = System.Drawing.Icon.ExtractAssociatedIcon(file.FullName); imageList1.Images.Add(file.Extension, iconForFile); } item.ImageKey = file.Extension; listView1.Items.Add(item); } listView1.EndUpdate(); } Private listView1 As ListView Private imageList1 As ImageList Public Sub ExtractAssociatedIconEx() ' Initialize the ListView, ImageList and Form. listView1 = New ListView() imageList1 = New ImageList() listView1.Location = New Point(37, 12) listView1.Size = New Size(161, 242) listView1.SmallImageList = imageList1 listView1.View = View.SmallIcon Me.ClientSize = New System.Drawing.Size(292, 266) Me.Controls.Add(Me.listView1) Me.Text = "Form1" ' Get the c:\ directory. Dim dir As New System.IO.DirectoryInfo("c:\") Dim item As ListViewItem listView1.BeginUpdate() Dim file As System.IO.FileInfo For Each file In dir.GetFiles() ' Set a default icon for the file. Dim iconForFile As Icon = SystemIcons.WinLogo item = New ListViewItem(file.Name, 1) ' Check to see if the image collection contains an image ' for this extension, using the extension as a key. If Not (imageList1.Images.ContainsKey(file.Extension)) Then ' If not, add the image to the image list. iconForFile = System.Drawing.Icon.ExtractAssociatedIcon(file.FullName) imageList1.Images.Add(file.Extension, iconForFile) End If item.ImageKey = file.Extension listView1.Items.Add(item) Next file listView1.EndUpdate() End Sub 编译代码编译示例： 将上述代码粘贴到 Windows 窗体中，并从窗体的构造函数或 ExtractAssociatedIconExample 事件处理方法调用 Load 方法。 你需要确保窗体导入 System.IO 命名空间。 另请参阅 图像、位图和图元文件 ListView 控件 |
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