学步园

该问题来自论坛提问，当ListView.View=List时，滚动条只能是水平的，解决这个问题需要子类化ListView处理WndProc消息，通过Windows API函数来设置它的滚动条。

演示代码：

using System;<br /> using System.Drawing;<br /> using System.Windows.Forms;<br /> namespace WindowsApplication1<br /> {<br /> public partial class Form1 : Form<br /> {<br /> /// <summary><br /> /// 子类化ListView，在View属性是List的时候出垂直滚动条<br /> /// by jinjazz<br /> /// http://blog.csdn.net/jinjazz<br /> /// </summary><br /> public class ListViewEx : ListView<br /> {<br /> [System.Runtime.InteropServices.DllImport("user32.dll")]<br /> public static extern int ShowScrollBar(IntPtr hWnd, int iBar, int bShow);<br /> const int SB_HORZ = 0;<br /> const int SB_VERT = 1;<br /> protected override void WndProc(ref Message m)<br /> {<br /> if (this.View == View.List)<br /> {<br /> ShowScrollBar(this.Handle, SB_VERT, 1);<br /> ShowScrollBar(this.Handle, SB_HORZ, 0);<br /> }<br /> base.WndProc(ref m);<br /> }<br /> }</p> <p> /// <summary><br /> /// 测试代码<br /> /// </summary><br /> public Form1()<br /> {<br /> InitializeComponent();<br /> //测试普通listview<br /> ListView list = new ListView();<br /> list.View = View.List;<br /> this.Controls.Add(list);<br /> list.Size = new Size(100, 100);<br /> list.Location = new Point(100, 100);<br /> for (int i = 0; i < 100; i++)<br /> {<br /> list.Items.Add(new ListViewItem(Guid.NewGuid().ToString()));<br /> }<br /> //测试子类化的listview<br /> list = new ListViewEx();<br /> list.View = View.List;<br /> this.Controls.Add(list);<br /> list.Size = new Size(100, 100);<br /> list.Location = new Point(300, 100);<br /> for (int i = 0; i < 100; i++)<br /> {<br /> list.Items.Add(new ListViewItem(Guid.NewGuid().ToString()));<br /> }<br /> }</p> <p> }<br /> }