浏览：

string fileName = string.Empty; 

private void button1_Click(object sender, EventArgs e)

{

OpenFileDialog openFileDialog1 = new OpenFileDialog();

openFileDialog1.Filter = "*.BMP,*.JPG;*.GIF|*.BMP;*.JPG;*.GIF";

openFileDialog1.ShowDialog();

fileName = openFileDialog1.FileName;

Image a = Image.FromFile(openFileDialog1.FileName);

Bitmap bit = new Bitmap(pictureBox1.Width, pictureBox1.Height);

Graphics g = Graphics.FromImage(bit);//从指定的 Image 创建新的 Graphics(绘图)。

g.DrawImage(a, new Rectangle(0, 0, bit.Width, bit.Height), new Rectangle(0, 0, a.Width, a.Height), GraphicsUnit.Pixel);

//第一个参数：要绘制的图像

//第二个参数：它指定所绘制图像的位置和大小。 将图像进行缩放以适合该矩形。

//第三个参数：它指定 image 对象中要绘制的部分。

pictureBox1.Image = bit;

}

确定：上传到数据库

private void button2_Click(object sender, EventArgs e)

{

FileStream fs = File.OpenRead(fileName);

byte[] img = new byte[fs.Length];

fs.Read(img, 0,img.Length);

fs.Close();

SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["Conn"].ToString());

SqlParameter p = new SqlParameter("@images", img);

SqlCommand sc = new SqlCommand("update Employees set employeeTx = @images where employeeID =2",conn);

sc.Parameters.Add(p);

if (sc.Connection.State == ConnectionState.Closed)

{

sc.Connection.Open();

}

sc.ExecuteNonQuery();

sc.Connection.Close();

Form3 f = new Form3();

this.Hide();

f.Show();

}

Form3窗体中显示图像 ：

private void Form3_Load(object sender, EventArgs e)

{

SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["Conn"]);

SqlCommand com = new SqlCommand("select employeeTx from Employees where employeeID = 2",conn);

conn.Open();

byte[] b = (byte[])com.ExecuteScalar();

if (b.Length > 0)

{

MemoryStream s = new MemoryStream(b, true);

s.Write(b,0,b.Length);

Image a = new Bitmap(s);

Bitmap bit = new Bitmap(pictureBox1.Width, pictureBox1.Height);

Graphics g = Graphics.FromImage(bit);//从指定的 Image 创建新的 Graphics(绘图)。

g.DrawImage(a, new Rectangle(0, 0, bit.Width, bit.Height), new Rectangle(0, 0, a.Width, a.Height), GraphicsUnit.Pixel);

//第一个参数：要绘制的图像

//第二个参数：它指定所绘制图像的位置和大小。 将图像进行缩放以适合该矩形。

//第三个参数：它指定 image 对象中要绘制的部分。

pictureBox1.Image = bit;

}

} 

 

另：绘制边框

private void pictureBox1_Paint(object sender, PaintEventArgs e)

{

  e.Graphics.DrawRectangle(new Pen(Color.Black, 2), new Rectangle(new Point(1, 1), new Size(this.pictureBox1.Width - 2, this.pictureBox1.Height - 2))); //考虑到线的宽度为4

}