我需要将选中的项目从一个复选框添加到另一个。我不应该在第二个复选框中多次添加一个项目。该设计有两个复选框和以下按钮:>、>>、<、<< 我尝试了下面的代码但无法获得任何显示。请让我知道我哪里出错了:
namespace TwoListBox
{
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
public delegate void OneArrowForwardClickHandler();
public event OneArrowForwardClickHandler OneArrowForward;
private void button1_Click(object sender, EventArgs e)
{
OneArrowForward += new OneArrowForwardClickHandler(OneForward);
}
public void OneForward()
{
foreach (Object cs in checkedListBox1.CheckedItems)
{
if (!checkedListBox2.Items.Contains(cs))
checkedListBox2.Items.Add(cs.ToString());
else
{
MessageBox.Show("Item is already added");
continue;
}
}
}
public delegate void TwoArrowForwardClickHandler();
public event TwoArrowForwardClickHandler TwoArrowForward;
private void button2_Click(object sender, EventArgs e)
{
TwoArrowForward += new TwoArrowForwardClickHandler(TwoForward);
}
public void TwoForward()
{
foreach (Object cs in checkedListBox1.Items)
{
if (!checkedListBox2.Items.Contains(cs))
checkedListBox2.Items.Add(cs.ToString());
else
MessageBox.Show("Items were already added");
}
}
public delegate void OneArrowBackwardClickHandler();
public event OneArrowBackwardClickHandler OneArrowBackward;
private void button3_Click(object sender, EventArgs e)
{
OneArrowBackward += new OneArrowBackwardClickHandler(OneBackward);
}
public void OneBackward()
{
foreach (Object cs in checkedListBox1.CheckedItems)
{
checkedListBox2.Items.Remove(cs);
}
}
public delegate void TwoArrowBackwardClickHandler();
public event TwoArrowBackwardClickHandler TwoArrowBackward;
private void button4_Click(object sender, EventArgs e)
{
TwoArrowBackward +=new TwoArrowBackwardClickHandler(TwoBackward);
}
public void TwoBackward()
{
foreach (Object cs in checkedListBox1.Items)
{
checkedListBox2.Items.Remove(cs);
}
}
private void button5_Click(object sender, EventArgs e)
{
string s = "The selected items are:";
for (int i = 0; i < checkedListBox2.Items.Count - 1; i++)
{
s += checkedListBox2.CheckedItems[i].ToString() + "\n";
}
MessageBox.Show(s);
}
}
}
注:> 表示添加选中项,>> 表示添加所有项,< 表示删除选中项,<< 表示删除所有项