当调整大小时，OnPaint 留下了轨迹

Question

我正在创建一个带有自定义边框的表单。 我想使用onPaint重写来绘制自己的边框。 不幸的是，当我只使用下面的代码时，会产生图像的残留。

有人知道如何解决这个问题吗？ 是的，我已经将DoubleBuffered设置为true。

protected override void OnPaint(PaintEventArgs e)
{
  Graphics g = e.Graphics;

  // Background
  g.FillRectangle(new SolidBrush(ColorTranslator.FromHtml("#EFEFF7")), new Rectangle(0, 0, this.Width - 1, this.Height - 1));

  // Outer Borders
  g.DrawImage(Resources.Resource.OuterBorderTopLeft, new Rectangle(0, 0, 13, 13));
  g.DrawImage(Resources.Resource.OuterBorderTopLeft1, new Rectangle(13, 0, 221, 13));
  g.DrawImage(Resources.Resource.OuterBorderTopLeft2, new Rectangle(0, 13, 13, 221));
  g.DrawImage(Resources.Resource.OuterBorderTopRight, new Rectangle(this.Size.Width - 13, 0, 13, 13));
  g.DrawImage(Resources.Resource.OuterBorderTopRight1, new Rectangle(this.Size.Width - 13, 13, 13, 221));
  g.DrawImage(Resources.Resource.OuterBorderTopRight2, new Rectangle(this.Size.Width - 234, 0, 221, 13));
  g.DrawImage(Resources.Resource.OuterBorderBottomLeft, new Rectangle(0, this.Size.Height - 13, 13, 13));
  g.DrawImage(Resources.Resource.OuterBorderBottomLeft1, new Rectangle(0, this.Size.Height - 234, 13, 221));
  g.DrawImage(Resources.Resource.OuterBorderBottomLeft2, new Rectangle(13, this.Size.Height - 13, 221, 13));
  g.DrawImage(Resources.Resource.OuterBorderBottomRight, new Rectangle(this.Size.Width - 13, this.Size.Height - 13, 13, 13));
  g.DrawImage(Resources.Resource.OuterBorderBottomRight1, new Rectangle(this.Size.Width - 234, this.Size.Height - 13, 221, 13));
  g.DrawImage(Resources.Resource.OuterBorderBottomRight2, new Rectangle(this.Size.Width - 13, this.Size.Height - 234, 13, 221));
  base.OnPaint(e);
}

- Dong Kyun Ham

Answer 1

尝试覆盖resize方法：

protected override void OnResize(EventArgs e) {
  base.OnResize(e);
  this.Invalidate();
}

或者在构造函数中，您可以添加另一个设置：

public Form1() {
  InitializeComponent();
  this.DoubleBuffered = true;
  this.ResizeRedraw = true;
}

- LarsTech

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虽然可选，但我建议将 this.DoubleBuffered = true。否则，闪烁会非常严重。 - RajV