好像CodeProject里有功能非常强大的类似控件，这里没必要用自定义控件。 左右移动就是简单的选择项增加删除，上下移动使用了高级语法，值得一学。
好像CodeProject里有功能非常强大的类似控件，这里没必要用自定义控件。
左右移动就是简单的选择项增加删除，上下移动使用了高级语法，值得一学。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using WinForm = System.Windows.Forms;
public static class ListBoxExtension
{
public static bool MoveSelectedItems(this WinForm.ListBox listBox, bool isUp, Action noSelectAction)
{
if (listBox.SelectedItems.Count > 0)
{
return listBox.MoveSelectedItems(isUp);
}
else
{
noSelectAction();
return false;
}
}
public static bool MoveSelectedItems(this WinForm.ListBox listBox, bool isUp)
{
bool result = true;
WinForm.ListBox.SelectedIndexCollection indices = listBox.SelectedIndices;
if (isUp)
{
if (listBox.SelectedItems.Count > 0 && indices[0] != 0)
{
foreach (int i in indices)
{
result &= MoveSelectedItem(listBox, i, true);
}
}
}
else
{
if (listBox.SelectedItems.Count > 0 && indices[indices.Count - 1] != listBox.Items.Count - 1)
{
for (int i = indices.Count - 1; i >= 0; i--)
{
result &= MoveSelectedItem(listBox, indices[i], false);
}
}
}
return result;
}
public static bool MoveSelectedItem(this WinForm.ListBox listBox, bool isUp, Action noSelectAction)
{
if (listBox.SelectedItems.Count > 0)
{
return MoveSelectedItem(listBox, listBox.SelectedIndex, isUp);
}
else
{
noSelectAction();
return false;
}
}
public static bool MoveSelectedItem(this WinForm.ListBox listBox, bool isUp)
{
return MoveSelectedItem(listBox, listBox.SelectedIndex, isUp);
}
private static bool MoveSelectedItem(this WinForm.ListBox listBox, int selectedIndex, bool isUp)
{
if (selectedIndex != (isUp ? 0 : listBox.Items.Count - 1))
{
object current = listBox.Items[selectedIndex];
int insertAt = selectedIndex + (isUp ? -1 : 1);
listBox.Items.RemoveAt(selectedIndex);
listBox.Items.Insert(insertAt, current);
listBox.SelectedIndex = insertAt;
return true;
}
return false;
}
}
这个类大概看了看，写得很棒。不管了，只管用。
public partial class FrmReportSet : Form
{
public FrmReportSet()
{
InitializeComponent();
}
private void btnAdd_Click(object sender, EventArgs e)
{
List<Object> listObj = new List<object>();
foreach (Object obj in lboxCanUse.SelectedItems)
{
lboxSelected.Items.Add(obj);
listObj.Add(obj);
}
foreach (Object obj in listObj)
{
lboxCanUse.Items.Remove(obj);
}
}
private void btnRemove_Click(object sender, EventArgs e)
{
List<Object> listObj = new List<object>();
foreach (Object obj in lboxSelected.SelectedItems)
{
lboxCanUse.Items.Add(obj);
listObj.Add(obj);
}
foreach (Object obj in listObj)
{
lboxSelected.Items.Remove(obj);
}
}
private void btnUp_Click(object sender, EventArgs e)
{
this.lboxSelected.MoveSelectedItems(true, () =>
{
MessageBox.Show("请选择");
});
}
private void btnDown_Click(object sender, EventArgs e)
{
this.lboxSelected.MoveSelectedItems(false, () =>
{
MessageBox.Show("请选择");
});
}
}
没注释，估计从Button名字应该能看出来。
