WinForm 窗体鼠标消息 up， down， click， doubleclick 响应先后顺序测试

事件响应及处理顺序：
单击事件：
down--------click-------up---
双击事件：
down---------click------up-----down-----doubleclick----up----

测试代码如下：

public partial class Form1 : Form
{
string a = "";
Thread d;
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.button2.Text = Thread.CurrentThread .ManagedThreadId.ToString ();
d = new Thread(new ThreadStart(this.doa));
d.Start ();
MessageBox.Show(a);
}

public void doa()
{
this.button3.Text = Thread.CurrentThread.ManagedThreadId .ToString();
this.button1.Text = "woshi";
}

private void Form1_MouseClick(object sender, MouseEventArgs e)
{
// MessageBox.Show("click");
a += "click ";
// MessageBox.Show(a);
}

private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
{
// MessageBox.Show("double click");
a += " double click ";
MessageBox.Show(a);
}

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
// MessageBox.Show("down ");
a += "down ";
//new Form2().Show();
}

private void Form1_MouseUp(object sender, MouseEventArgs e)
{
a += "up ";
//MessageBox.Show("up");
}
}