文本框事件顺序

测试代码如下：

测试代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace test13
{
    public partial class Form6 : Form
    {
        public Form6()
        {
            InitializeComponent();
            textBox1.GotFocus += new EventHandler(textBox1_GotFocus);
        }

        private void textBox1_GotFocus(object sender, EventArgs e)
        {
            AddLog("textBox1_GotFocus");
        }

        private void textBox1_Click(object sender, EventArgs e)
        {
            AddLog("textBox1_Click");
        }

        private void textBox1_DoubleClick(object sender, EventArgs e)
        {
            AddLog("textBox1_DoubleClick");
        }

        private void textBox1_Enter(object sender, EventArgs e)
        {
            AddLog("textBox1_Enter");
        }

        private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            AddLog("textBox1_KeyDown");
        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            AddLog("textBox1_KeyPress");
        }

        private void textBox1_KeyUp(object sender, KeyEventArgs e)
        {
            AddLog("textBox1_KeyUp");
        }

        private void textBox1_Leave(object sender, EventArgs e)
        {
            AddLog("textBox1_Leave");
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            AddLog("textBox1_TextChanged");
        }

        private void textBox1_Validated(object sender, EventArgs e)
        {            
            AddLog("textBox1_Validated");
        }

        private void textBox1_Validating(object sender, CancelEventArgs e)
        {
            if (checkBox1.Checked)
            {
                if (this.ActiveControl != checkBox1)
                {
                    AddLog("textBox1_Validating");
                    return;
                }
                else
                {
                    AddLog("textBox1_Validating:Cancel");
                    e.Cancel = checkBox1.Checked;
                }
            }
            else
            {
                AddLog("textBox1_Validating");
            }            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            richTextBox1.Text = "";
        }

        private void textBox3_Click(object sender, EventArgs e)
        {
            AddLog("textBox3_Click");
        }

        private void textBox3_DoubleClick(object sender, EventArgs e)
        {
            AddLog("textBox3_DoubleClick");
        }

        private void textBox3_Enter(object sender, EventArgs e)
        {
            AddLog("textBox3_Enter");
        }

        private void textBox3_Leave(object sender, EventArgs e)
        {
            AddLog("textBox3_Leave");
        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {
            AddLog("textBox3_TextChanged");
        }

        private void textBox3_Validated(object sender, EventArgs e)
        {
            AddLog("textBox3_Validated");
        }

        private void textBox3_Validating(object sender, CancelEventArgs e)
        {
            AddLog("textBox3_Validating");
        }

        private void AddLog(string logcon)
        {
            string s = richTextBox1.Text;
            s += logcon + ";\t" + textBox1.Focused + "\t" + textBox3.Focused + "\t" + this.ActiveControl.Name + "\n";
            richTextBox1.Text = s;
        }
    }
}

测试结果：

画面初始化时焦点在textBox1中， 然后输入“1”和“2”。 鼠标点击进入textBox3，输入“1”， 然后点击其他按钮。				画面初始化时焦点在textBox1中， 然后输入“1”和“2”。 按tab键进入textBox3，输入“1”， 然后按按tab键焦点移动到richTextBox1。
事件顺序	textBox1. Focused	textBox3. Focused	ActiveControl	事件顺序	textBox1. Focused	textBox3. Focused	ActiveControl
textBox1_Enter;	FALSE	FALSE	textBox1	textBox1_Enter;	FALSE	FALSE	textBox1
textBox1_GotFocus;	TRUE	FALSE	textBox1	textBox1_GotFocus;	TRUE	FALSE	textBox1
textBox1_KeyDown;	TRUE	FALSE	textBox1	textBox1_KeyDown;	TRUE	FALSE	textBox1
textBox1_KeyPress;	TRUE	FALSE	textBox1	textBox1_KeyPress;	TRUE	FALSE	textBox1
textBox1_TextChanged;	TRUE	FALSE	textBox1	textBox1_TextChanged;	TRUE	FALSE	textBox1
textBox1_KeyUp;	TRUE	FALSE	textBox1	textBox1_KeyUp;	TRUE	FALSE	textBox1
textBox1_KeyDown;	TRUE	FALSE	textBox1	textBox1_KeyDown;	TRUE	FALSE	textBox1
textBox1_KeyPress;	TRUE	FALSE	textBox1	textBox1_KeyPress;	TRUE	FALSE	textBox1
textBox1_TextChanged;	TRUE	FALSE	textBox1	textBox1_TextChanged;	TRUE	FALSE	textBox1
textBox1_KeyUp;	TRUE	FALSE	textBox1	textBox1_KeyUp;	TRUE	FALSE	textBox1
textBox1_Leave;	FALSE	TRUE	textBox3	textBox1_Leave;	TRUE	FALSE	textBox3
textBox1_Validating;	FALSE	TRUE	textBox3	textBox1_Validating;	TRUE	FALSE	textBox3
textBox1_Validated;	FALSE	TRUE	textBox3	textBox1_Validated;	TRUE	FALSE	textBox3
textBox3_Enter;	FALSE	TRUE	textBox3	textBox3_Enter;	TRUE	FALSE	textBox3
textBox3_Click;	FALSE	TRUE	textBox3	textBox3_TextChanged;	FALSE	TRUE	textBox3
textBox3_TextChanged;	FALSE	TRUE	textBox3	textBox3_Leave;	FALSE	TRUE	richTextBox1
textBox3_Leave;	FALSE	FALSE	button1	textBox3_Validating;	FALSE	TRUE	richTextBox1
textBox3_Validating;	FALSE	FALSE	button1	textBox3_Validated;	FALSE	TRUE	richTextBox1
textBox3_Validated;	FALSE	FALSE	button1