c#中ControlPaint.DrawReversibleFrame(thisform.RectangleToScreen(SelectRect), Col

c#中ControlPaint.DrawReversibleFrame(thisform.RectangleToScreen(SelectRect), Color.Black, FrameStyle.Dashed);这一句是什么意思？？？、

这种现象我也遇到过，主要的原因是因为窗体上的控件太多，而且过多的设置了控件的Ancher属性，使窗体重绘的控件过多，或者是设置窗体的TransparencyKey的属性，我的解决方案就是用的画虚框的方法，那个程序已经找不着了，给你简单写了个右边框拉伸的，代码如下

//不要设置窗体的TransparencyKey的属性

Rectangle bolderRight;
Rectangle drawRect;
bool draw = false;
int bolderWidth = 4;
int lastWidth = -32000;

private void Form1_Load(object sender, EventArgs e)
{
bolderRight = new Rectangle(this.Width - bolderWidth, 0, bolderWidth, this.Height);
drawRect = new Rectangle(this.Location, this.Size);
}

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left || bolderRight.Contains(e.Location))
{
this.Cursor = Cursors.SizeWE;
draw = true;
}
}

private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (bolderRight.Contains(e.Location))
this.Cursor = Cursors.SizeWE;
else
this.Cursor = Cursors.Default;
if (draw)
{
if (lastWidth != -32000)//擦出上一次绘制的边框
ControlPaint.DrawReversibleFrame(new Rectangle(drawRect.Location, new Size(lastWidth, drawRect.Height)), Color.Black, FrameStyle.Dashed);
drawRect.Width = MousePosition.X - this.Left;
ControlPaint.DrawReversibleFrame(drawRect, Color.Black, FrameStyle.Dashed);
lastWidth = drawRect.Width;
}
}

private void Form1_MouseUp(object sender, MouseEventArgs e)
{
draw = false;
ControlPaint.DrawReversibleFrame(drawRect, Color.Black, FrameStyle.Dashed);
this.Size = drawRect.Size;
lastWidth = -32000;
}

private void Form1_Resize(object sender, EventArgs e)
{
bolderRight = new Rectangle(this.Width - bolderWidth, 0, bolderWidth, this.Height);
drawRect = new Rectangle(this.Location, this.Size);
}

rect src = new rect();// 图片 rect dst = new rect();// 屏幕 src.left = bx; src.top = by; src.right = bx + w; src.bottom = by + h; dst.left = x; dst.top = y; dst.right = x + w; dst.bottom = y + h; canvas.drawbitmap(blt, src, dst, null); 应该能看懂吧