有点想不明白...
Dispose 不是把目标销毁么？
代码贴上：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Dispose销毁目标
{
public partial class Form1 : Form
{
Point start, end;
bool mousedown = false;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (mousedown)
{
Bitmap bmp = new Bitmap(this.Width, this.Height);
Graphics gr = Graphics.FromImage(bmp);
//Graphics gr = this.CreateGraphics();
gr.DrawRectangle(new Pen(Color.Red),start.X,start.Y,e.X-start.X,e.Y-start.Y);
Graphics tg = this.CreateGraphics();
tg.DrawImage(bmp, 0, 0);
gr.Dispose();
}
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
mousedown = true;
start = new Point(e.X, e.Y);
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
mousedown = false;
end = new Point(e.X, e.Y);
Graphics gr = this.CreateGraphics();
gr.DrawRectangle(new Pen(Color.Black), start.X, start.Y, end.X - start.X, end.Y - start.Y);
}
}
}
