我想通过click来开始画图,但不知道怎么把两个事件联系起来,我是这么做的
public partial class Form1 : Form
{
System.Windows.Forms.PaintEventArgs k; public Form1()
{
InitializeComponent();
}
private void 画图_Click(object sender, EventArgs e)
{
Form1_Paint( sender, k)//运行后,它说未将对象引用设置到对象的实例,这又是怎么回事呀?
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
。
}
public partial class Form1 : Form
{
System.Windows.Forms.PaintEventArgs k; public Form1()
{
InitializeComponent();
}
private void 画图_Click(object sender, EventArgs e)
{
Form1_Paint( sender, k)//运行后,它说未将对象引用设置到对象的实例,这又是怎么回事呀?
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
。
}
private void button1_Click(object sender, EventArgs e)
{
button2.Paint += new PaintEventHandler(Hello_Paint);
} private void Hello_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.DrawString("This is a diagonal line drawn on the control", new Font("Arial", 10), System.Drawing.Brushes.Blue, new Point(30, 30)); }相信你能看得懂
还有给小问题: 为什么这个运行这么慢呀!要等很久才会画出来
还有给小问题: 为什么这个运行这么慢呀!要等很久才会画出来
button2.Paint += new PaintEventHandler(Hello_Paint);
后面加上 this.Refresh(); 然后试下