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//假设图片在C盘根目录下
string path="c:\\"
//鼠标进入PictureBox
private void PictureBox1_MouseEnter(object sender, EventArgs e)
{
PictureBox1.Image = Image.FromFile(path + "1.jpg");
}
//鼠标离开PictureBox
private void PictureBox1_MouseLeave(object sender, EventArgs e)
{
PictureBox1.Image = Image.FromFile(path + "ico2.gif");
}