C# WinForm中Listview的使用

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在WinForm中，有时候需要在画面上显示图标以及详情之类的，还有的更多功能需要大中小图标的切换显示，这时候可以考虑Listview控件。代码如下：

private void BoardDisplay(int kbn){this.listView1.Clear();if (kbn == 0){ImageLoad(1);if (board_nums == 0){return;}this.listView1.View = View.List;this.listView1.SmallImageList = this.imageList1;this.listView1.BeginUpdate();for (int i = 1; i <= board_nums; i++){ListViewItem boardList = new ListViewItem();boardList.ImageIndex = i - 1;boardList.Text = board_names[i - 1];this.listView1.Items.Add(boardList);}this.listView1.EndUpdate();}else if (kbn == 1){ImageLoad(2);if (board_nums == 0){return;}this.listView1.View = View.SmallIcon;this.listView1.SmallImageList = this.imageList2;this.listView1.BeginUpdate();for (int i = 1; i <= board_nums; i++){ListViewItem boardList = new ListViewItem();boardList.ImageIndex = i - 1;boardList.Text = board_names[i - 1];this.listView1.Items.Add(boardList);}this.listView1.EndUpdate();}else{ImageLoad(3);if (board_nums == 0){return;}this.listView1.View = View.LargeIcon;this.listView1.LargeImageList = this.imageList3;this.listView1.BeginUpdate();for (int i = 1; i <= board_nums; i++){ListViewItem boardList = new ListViewItem();boardList.ImageIndex = i - 1;boardList.Text = board_names[i - 1];this.listView1.Items.Add(boardList);}this.listView1.EndUpdate();}}

以上代码中的kbn是用来区别大中小图标的显示的，三种情况下Listview关联三个不同的Imagelist，三个imagelist中分别存放不同尺寸的图标。关联imagelist之前，要先将图片加载到imagelist中，即ImageLoad()方法（如下），再将此时的显示形式设置为相应的形式，即listview1.View = View.LargeIcon;这句话就是显示设置为大图标显示，这里显示共有5种属性。然后关联相应的imagelist。BeginUpdate()和EndUpdate()用于在向listview中加载显示项的过程中将listview置于挂起状态，令显示更加稳定。

private void ImageLoad(int kbn){board_nums = 0;DirectoryInfo di = new DirectoryInfo(kojiFolderPC);if (!di.Exists){//MessageBox.Show("画像のパスが存在しません");return;}if (di.GetFiles("*" + Para.iconType).Length != 0){switch (kbn){case 1:imageList1.Images.Clear();board_names = new string[di.GetFiles("*" + Para.iconType).Length];foreach (FileInfo fi in di.GetFiles("*" + Para.iconType)){imageList1.Images.Add(Image.FromFile(fi.FullName));board_names[board_nums] = fi.Name.Substring(0, fi.Name.Length - 4);board_nums++;}break;case 2:imageList2.Images.Clear();board_names = new string[di.GetFiles("*" + Para.iconType).Length];foreach (FileInfo fi in di.GetFiles("*" + Para.iconType)){imageList2.Images.Add(Image.FromFile(fi.FullName));board_names[board_nums] = fi.Name.Substring(0, fi.Name.Length - 4);board_nums++;}break;case 3:imageList3.Images.Clear();board_names = new string[di.GetFiles("*" + Para.iconType).Length];foreach (FileInfo fi in di.GetFiles("*" + Para.iconType)){imageList3.Images.Add(Image.FromFile(fi.FullName));board_names[board_nums] = fi.Name.Substring(0, fi.Name.Length - 4);board_nums++;}break;}}}

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