Question

我需要将检查项从一个检查表添加到另一个检查表。我不应该多次将项目添加到第二个清单框中。该设计有两个checklistboxes和以下按钮：＆gt;，＆gt;＆gt;，＆lt;，＆lt;＆lt; 我已经尝试了下面的代码，但无法显示任何内容。请让我知道我错在哪里：

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);
        }

    }
}

注意：＆gt;表示添加选中的项目，＆gt;＆gt;意味着添加所有项目，＆lt;表示删除所选项目＆lt;＆lt;意味着删除所有项目

Answer 1

在按钮单击事件中，您只需向事件添加事件处理程序。你试过直接调用这个函数吗？

不是创建事件处理程序，而是调用每个函数，类似于在button1的click事件中调用OneForward()的方法：

    private void button1_Click(object sender, EventArgs e)
    {
        OneForward();
    }

对评论的回应

如果您的意思是要通知家长您的按钮被点击并且OneForward已经完成，您可以在OneForward功能结束时使用以下行：

OneArrowForward(this, new EventArgs());

但是如果你想从父母那里调用OneForward，那么你必须将其公开，然后从你简单地打电话给父母：

myUserControlInstance.OneForward();

如何将一个checkedlistbox中的已检查项目添加到另一个checkedlistbox？

1 个答案: