[ASP.NET教程] C#中如何实现数据拖动？(拖动图片，到TextBox，并显示)

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C#中如何实现数据拖动？(拖动图片，到TextBox，并显示)

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace TestKeyPress
{
public partial class Form2 : Form
{
public Form2()
{http://www.kmnk03.com/hxpfk/bptx/349.html
InitializeComponent();
}
private void textBox1_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
private void textBox1_DragDrop(object sender, DragEventArgs e)
{http://www.kmnk03.com/hxpfk/bptx/350.html
//DataFormats.FileDrop确定你拖动过去的是文件回或者文件夹
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
string realpath = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();
//从拖动数据里得到路径
//MessageBox.Show(realpath);测试路径
string p = Path.GetExtension(realpath);
//MessageBox.Show(p);测试路径
if (p == ".jpg")
{http://www.kmnk03.com/hxpfk/bptx/351.html
//StreamReader sr = new StreamReader(realpath);读取方式，放弃使用
Image im = Image.FromFile(realpath);
int h = im.Height;
int w = im.Width;
this.pictureBox1.Height = h;
this.pictureBox1.Width = w;
this.pictureBox1.BackgroundImageLayout = ImageLayout.Stretch;
this.pictureBox1.BackgroundImage = im;
//将读取到的图片放到picturebox里
//this.pictureBox1.Location = new Point(130 - pictureBox1.Width, 85 - pictureBox1.Height);
Point pnl = new Point(this.panel1.Width / 2, this.panel1.Height / 2);
Point pic = new Point();http://www.kmnk03.com/hxpfk/bptx/352.html
pic.X = pnl.X - pictureBox1.Width / 2;
pic.Y = pnl.Y - pictureBox1.Height / 2;
this.pictureBox1.Location = pic;
//上面的代码是将图片的中心和panel的中心对齐
//this.pictureBox1.Location = new Point(85 ,76);
}
}
else
{http://www.kmnk03.com/hxpfk/bptx/353.html
MessageBox.Show("please select jpg");
}
//MessageBox.Show(e.Data.GetType().ToString());
}
//放大功能
private void button1_Click(object sender, EventArgs e)
{
Image im = this.pictureBox1.BackgroundImage;
//im.Mhttp://www.kmnk03.com/hxpfk/bptx/354.html
pictureBox1.Height = (int)(pictureBox1.Height * 1.2);
pictureBox1.Width = (int)(pictureBox1.Width * 1.2);
Point pnl = new Point(this.panel1.Width / 2, this.panel1.Height / 2);
Point pic = new Point();
pic.X = pnl.X - pictureBox1.Width / 2;
pic.Y = pnl.Y - pictureBox1.Height / 2;
this.pictureBox1.Location = pic;
}
//缩小功能
private void button2_Click(object sender, EventArgs e)
{http://www.kmnk03.com/hxpfk/bptx/355.html
Image im = this.pictureBox1.BackgroundImage;
//im.M
pictureBox1.Height = (int)(pictureBox1.Height * 0.85);
pictureBox1.Width = (int)(pictureBox1.Width * 0.85);
Point pnl = new Point(this.panel1.Width / 2, this.panel1.Height / 2);
Point pic = new Point();
pic.X = pnl.X - pictureBox1.Width / 2;
pic.Y = pnl.Y - pictureBox1.Height / 2;
this.pictureBox1.Location = pic;
}
private Point start;
private Point end;http://www.kmnk03.com/hxpfk/bptx/356.html
//下面的函数实现，图片在panel里可以拖动
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
start = new Point(e.X, e.Y);
end = start;
}
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{http://www.kmnk03.com/hxpfk/bptx/358.html
end = new Point(e.X, e.Y);
int picx = this.pictureBox1.Location.X;
int picy = this.pictureBox1.Location.Y;
picx += end.X - start.X;
picy += end.Y - start.Y;
this.pictureBox1.Location = new Point(picx, picy);
http://www.kmnk03.com/hxpfk/bptx/362.html
}
}
}
kmnk03.com
www.kmnk03.com

数据拖动，主要是在接受数据的地方添加DragEnter和DragDrop事件，必须将接受数据的地方设置为AllowDrop=true，如果在一个窗体内拖动，选择数据的地方也要设置AllowDrop=true，

C#中如何实现数据拖动？(拖动图片，到TextBox，并显示)

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