委托和事件的小例子（按照别人的例子写的）

最新推荐文章于 2020-12-09 16:58:31 发布

原创最新推荐文章于 2020-12-09 16:58:31 发布 · 423 阅读

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#textbox #string #listview #object #button #class

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本文介绍了使用委托、事件和构造函数实现子窗口输入到主窗口显示的通信方法，提供了MainForm类、AddForm类、AddForm2类和AddForm3类的代码实现。

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利用委托和事件完成窗口间的通信（子窗口输入，主窗口显示，3种方法）

MainForm类代码：

    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        //利用委托实现
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            AddForm addform = new AddForm();
            addform.recorder = this.addItem;
            addform.ShowDialog();
        }
        //自定义函数
        private void addItem(String time, String things, String demo)
        {
            ListViewItem lv = new ListViewItem(time);
            lv.SubItems.Add(things);
            lv.SubItems.Add(demo);
            listView1.Items.Add(lv);
        }
        //利用委托和事件
        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            AddForm2 addForm = new AddForm2();
            addForm.buttSubmit += addItem;
            addForm.ShowDialog();
        }
        //利用构造函数
        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            AddForm3 addForm = new AddForm3(listView1 );
            addForm.Show();
        }
    }

AddForm类--利用委托实现

    public partial class AddForm : Form
    {
        //利用委托
        public delegate void AddInfo(String time, String thing, String demo);

public AddInfo recorder;

        private String time;
        private String thing;
        private String memo;
        public AddForm()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            time = this.dateTimePicker1.Text.ToString();
            thing = this.textBox1.Text.Trim();
            memo = this.textBox2.Text.Trim();
            if (thing != "" && memo != "")
            {
                if (recorder != null)
                {
                    ///调用委托实现主窗口的方法
                    recorder(time, thing, memo);
                }
            }
            else
                MessageBox.Show("输入不能为空！");
            textBox1.Text="";
            textBox2.Text="";
        }
    }

AddForm2类--利用委托和事件

public partial class AddForm2 : Form
    {
        //利用委托和事件
        public delegate void AddItems(String times, String things, String demos);
        public event AddItems buttSubmit;//自定义事件

        private String time;
        private String thing;
        private String demo;

        public AddForm2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            time = dateTimePicker1.Text;
            thing = textBox1.Text;
            demo = textBox2.Text;
            buttSubmit(time,thing,demo);
        }
    }

AddForm3--利用构造函数

    public partial class AddForm3 : Form
    {
        //利用构造函数
        private ListView _lvAdd;

        public AddForm3(ListView lvAdd)
        {
            InitializeComponent();
            _lvAdd = lvAdd;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ListViewItem lv = new ListViewItem(dateTimePicker1.Text);
            lv.SubItems.Add(textBox1.Text);
            lv.SubItems.Add(textBox2.Text);
            _lvAdd.Items.Add(lv);
        }
    }

MainForm图

AddForm图