我的PictureBox的问题，急急急！！！

Question

将你画图的过程转到picturebox的paint的事件中，在画图时强制刷新屏幕就可以了，用ArrayList

Answer 1

我已经在TextBox中加了事件了啊，我怎么加在paint的事件中呢？？
急！！！
谢谢！！！

Answer 2

Microsoft Visual Studio .NET\FrameworkSDK\Samples\QuickStart\winforms\samples\gdiplus本来不想给你建议用OnPaint事件做，但看看.net的例子，好像都用它来处理:-(

Answer 3

参考这个
//---------------------------------------------
// BetterBlockOut.cs ?2001 by Charles Petzold
//---------------------------------------------
using System;
using System.Drawing;
using System.Windows.Forms;class BetterBlockOut: Form
{
     bool      bBlocking, bValidBox;
     Point     ptBeg, ptEnd;
     Rectangle rectBox;     public static void Main()
     {
          Application.Run(new BetterBlockOut());
     }
     public BetterBlockOut()
     {
          Text = "Better Blockout";
          BackColor = SystemColors.Window;
          ForeColor = SystemColors.WindowText;
     }
     protected override void OnMouseDown(MouseEventArgs mea)
     {
          if (mea.Button == MouseButtons.Left)
          {
               ptBeg = ptEnd = new Point(mea.X, mea.Y);               Graphics grfx = CreateGraphics();
               grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd));
               grfx.Dispose();               bBlocking = true;
          }
     }
     protected override void OnMouseMove(MouseEventArgs mea)
     {
          if (bBlocking && (mea.Button & MouseButtons.Left) != 0)
          {
               Graphics grfx = CreateGraphics();
               grfx.DrawRectangle(new Pen(BackColor), Rect(ptBeg, ptEnd));
               ptEnd = new Point(mea.X, mea.Y);
               grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd));
               grfx.Dispose();
               Invalidate();
          }
     }
     protected override void OnMouseUp(MouseEventArgs mea)
     {
          if (bBlocking)
          {
               Graphics grfx = CreateGraphics();
               rectBox = Rect(ptBeg, new Point(mea.X, mea.Y));
               grfx.DrawRectangle(new Pen(ForeColor), rectBox);
               grfx.Dispose();               bBlocking = false;
               bValidBox = true;
               Invalidate();
          }
     }
     protected override void OnKeyPress(KeyPressEventArgs kpea)
     {
          if (bBlocking && kpea.KeyChar == '\x001B')   // Escape
          {
               Graphics grfx = CreateGraphics();
               grfx.DrawRectangle(new Pen(BackColor), Rect(ptBeg, ptEnd));
               grfx.Dispose();
               
               bBlocking = false;
               Invalidate();
          }
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;          if (bValidBox)
               grfx.FillRectangle(new SolidBrush(ForeColor), rectBox);          if (bBlocking)
               grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd));
     }
     Rectangle Rect(Point ptBeg, Point ptEnd)
     {
          return new Rectangle(Math.Min(ptBeg.X, ptEnd.X),
                               Math.Min(ptBeg.Y, ptEnd.Y),
                               Math.Abs(ptEnd.X - ptBeg.X),
                               Math.Abs(ptEnd.Y - ptBeg.Y));
     }
}

Answer 4

TextBox自身是没有Paint事件，自己写一个事件，加入上去就行了。
如下：
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = this.textBox1.CreateGraphics();
g.SmoothingMode = SmoothingMode.AntiAlias; //Fill the background use the texture brush
//and then apply a white wash
g.FillRectangle(new SolidBrush(Color.Red), ClientRectangle);
g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.White)), ClientRectangle); //Add a Red rectangle and a yellow one that overlaps it
g.FillRectangle(new SolidBrush(Color.Red), 20, 20, 50, 50);
g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.Yellow)), 40, 40, 50, 50); //Add a circle that is filled with a translucent hatch
HatchBrush hb = new HatchBrush(HatchStyle.ForwardDiagonal, Color.Green, Color.FromArgb(100, Color.Yellow));
g.FillEllipse(hb, 250, 10, 100, 100); //Now create a rectangle filled with a gradient brush
Rectangle r = new Rectangle(300, 250, 100, 100);
LinearGradientBrush lb = new LinearGradientBrush(r, Color.Red, Color.Yellow,LinearGradientMode.BackwardDiagonal);
g.FillRectangle(lb, r); g.ResetTransform();
}