picturebox 怎样显示文字

利用c#的GDI+技术，PictureBox.CreateGraphics()绘图，利用g.DrawString写文字。

利用this.Invalidate()刷新Form窗体，或者利用PictureBox.Invalidate()刷新PictureBox.。

代码如下：

using System

using System.Collections.Generic

using System.ComponentModel

using System.Data

using System.Drawing

using System.Text

using System.Windows.Forms

namespace CCDTest

{

public partial class Form1 : Form

{

string filename

//Label lblResult

public Form1()

{

InitializeComponent()

filename = Application.StartupPath + ""

}

private void Form1_Load(object sender, EventArgs e)

{

pbCCD.Load(filename)

}

private void pbCCD_MouseDown(object sender, MouseEventArgs e)

{

PointF pf = e.Location

using (Graphics g = pbCCD.CreateGraphics())

{

Console.WriteLine("Beg MyDraw....")

Font f = new Font("Arial", 12)

g.DrawString("Hello!", f, Brushes.Violet, pf)

Console.WriteLine("End MyDraw.....")

}

}

private void pbCCD_MouseUp(object sender, MouseEventArgs e)

{

pbCCD.Invalidate()

}

}

}

 Graphics a = Graphics.FromImage(this.pictureBox1.Image)

//改为:

Graphics a = pictureBox1.CreateGraphics()

去掉

a.Dispose()

---