在按钮的单击事件中 PictureBox picBox = new PictureBox();
picBox.Width = 260;
picBox.Height = 80;
picBox.Left = 20;
picBox.Top = 20;
panel1.Controls.Add(picBox);
Graphics myGrap = picBox.CreateGraphics();
Pen blackPen = new Pen(Color.Black, 3);
Point point1 = new Point(100, 100);
Point point2 = new Point(500, 100);
myGrap.DrawLine(blackPen, point1, point2);
为什么就显示不出来呢
picBox.Width = 260;
picBox.Height = 80;
picBox.Left = 20;
picBox.Top = 20;
panel1.Controls.Add(picBox);
Graphics myGrap = picBox.CreateGraphics();
Pen blackPen = new Pen(Color.Black, 3);
Point point1 = new Point(100, 100);
Point point2 = new Point(500, 100);
myGrap.DrawLine(blackPen, point1, point2);
为什么就显示不出来呢
PictureBox picBox = new PictureBox();
picBox.Width = 260;
picBox.Height = 80;
picBox.Left = 20;
picBox.Top = 20;
picBox.CreateControl();
panel1.Controls.Add(picBox);
picBox.ImageLocation = "http://community.csdn.net/images/csdn.gif";
正常,表示创建成功了
Graphics myGrap = picBox.CreateGraphics();
Pen blackPen = new Pen(Color.Black, 3);
Point point1 = new Point(100, 100);
Point point2 = new Point(500, 100);
myGrap.DrawLine(blackPen, point1, point2);
就可以显示出数据来,- -!
{
PictureBox picBox = new PictureBox();
picBox.Width = 260;
picBox.Height = 80;
picBox.Left = 20;
picBox.Top = 20;
picBox.CreateControl();
panel1.Controls.Add(picBox);
picBox.ImageLocation = "http://community.csdn.net/images/csdn.gif";
} private void button2_Click(object sender, EventArgs e)
{
PictureBox picBox = panel1.Controls[0] as PictureBox;
Graphics myGrap = picBox.CreateGraphics();
Pen blackPen = new Pen(Color.Black, 3);
Point point1 = new Point(1, 20);
Point point2 = new Point(1, 40);
myGrap.DrawLine(blackPen, point1, point2);
}
- -! 谢谢 这不是我要的效果,要是这样的话用户会有意见!
picBox.Width = 260;
picBox.Height = 80;
picBox.Left = 0;
picBox.Top = 0;
panel1.Controls.Add(picBox);
panel1.Refresh();
Graphics myGrap = picBox.CreateGraphics();
Pen blackPen = new Pen(Color.Black, 3);
Point point1 = new Point(1, 1);
Point point2 = new Point(260, 80);
myGrap.DrawLine(blackPen, point1, point2);
Dim pic As New PictureBox
With pic
.Location = New Point(100, 50)
.Size = New Size(200, 200)
.BorderStyle = BorderStyle.FixedSingle
End With
Me.Controls.Add(pic)
Dim g As Graphics = Me.GetGraphics(pic)
g.DrawLine(Pens.Red, New Point(0, 0), New Point(pic.Width, pic.Height))
End Sub Function GetGraphics(ByRef pic As PictureBox) As Graphics
Dim bmp As Bitmap = New Bitmap(pic.Width, pic.Height)
pic.Image = bmp Dim g As System.Drawing.Graphics = Graphics.FromImage(bmp)
Return g
End FunctionEnd Class
忘完了,郁闷!唉!!!