如何更改组框边框的颜色？

在C＃.NET中，我试图以编程方式更改组框中边框的颜色。

更新：在我们切换到.NET之前，当我在winforms系统上工作时，问了这个问题。

Answer 1

在前面的答案的基础上，一个更好的解决方案，包括组框的标签：

groupBox1.Paint += PaintBorderlessGroupBox; private void PaintBorderlessGroupBox(object sender, PaintEventArgs p) { GroupBox box = (GroupBox)sender; p.Graphics.Clear(SystemColors.Control); p.Graphics.DrawString(box.Text, box.Font, Brushes.Black, 0, 0); } 

您可能希望调整文本的x / y，但对于我的使用，这是正确的。

Answer 2

只需添加绘画事件。

  private void groupBox1_Paint(object sender, PaintEventArgs e) { GroupBox box = sender as GroupBox; DrawGroupBox(box, e.Graphics, Color.Red, Color.Blue); } private void DrawGroupBox(GroupBox box, Graphics g, Color textColor, Color borderColor) { if (box != null) { Brush textBrush = new SolidBrush(textColor); Brush borderBrush = new SolidBrush(borderColor); Pen borderPen = new Pen(borderBrush); SizeF strSize = g.MeasureString(box.Text, box.Font); Rectangle rect = new Rectangle(box.ClientRectangle.X, box.ClientRectangle.Y + (int)(strSize.Height / 2), box.ClientRectangle.Width - 1, box.ClientRectangle.Height - (int)(strSize.Height / 2) - 1); // Clear text and border g.Clear(this.BackColor); // Draw text g.DrawString(box.Text, box.Font, textBrush, box.Padding.Left, 0); // Drawing Border //Left g.DrawLine(borderPen, rect.Location, new Point(rect.X, rect.Y + rect.Height)); //Right g.DrawLine(borderPen, new Point(rect.X + rect.Width, rect.Y), new Point(rect.X + rect.Width, rect.Y + rect.Height)); //Bottom g.DrawLine(borderPen, new Point(rect.X, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y + rect.Height)); //Top1 g.DrawLine(borderPen, new Point(rect.X, rect.Y), new Point(rect.X + box.Padding.Left, rect.Y)); //Top2 g.DrawLine(borderPen, new Point(rect.X + box.Padding.Left + (int)(strSize.Width), rect.Y), new Point(rect.X + rect.Width, rect.Y)); } } 

Answer 3

只需在此方法的任何对象（不仅仅是按钮）上设置绘制操作以绘制边框。

  private void UserControl1_Paint(object sender, PaintEventArgs e) { ControlPaint.DrawBorder(e.Graphics, this.ClientRectangle, Color.Red, ButtonBorderStyle.Solid); } 

它仍然不像原版那样漂亮和圆润，但它更简单。

Answer 4

FWIW，这是我使用的实现。 它是GroupBox的孩子，但不仅允许设置BorderColor，还允许设置边框的粗细和圆角的半径。 此外，您可以为GroupBox标签设置所需的缩进量，并使用右侧的缩进缩进缩进。

 using System; using System.Drawing; using System.Windows.Forms; namespace BorderedGroupBox { public class BorderedGroupBox : GroupBox { private Color _borderColor = Color.Black; private int _borderWidth = 2; private int _borderRadius = 5; private int _textIndent = 10; public BorderedGroupBox() : base() { InitializeComponent(); this.Paint += this.BorderedGroupBox_Paint; } public BorderedGroupBox(int width, float radius, Color color) : base() { this._borderWidth = Math.Max(1,width); this._borderColor = color; this._borderRadius = Math.Max(0,radius); InitializeComponent(); this.Paint += this.BorderedGroupBox_Paint; } public Color BorderColor { get => this._borderColor; set { this._borderColor = value; DrawGroupBox(); } } public int BorderWidth { get => this._borderWidth; set { if (value > 0) { this._borderWidth = Math.Min(value, 10); DrawGroupBox(); } } } public int BorderRadius { get => this._borderRadius; set { // Setting a radius of 0 produces square corners... if (value >= 0) { this._borderRadius = value; this.DrawGroupBox(); } } } public int LabelIndent { get => this._textIndent; set { this._textIndent = value; this.DrawGroupBox(); } } private void BorderedGroupBox_Paint(object sender, PaintEventArgs e) => DrawGroupBox(e.Graphics); private void DrawGroupBox() => this.DrawGroupBox(this.CreateGraphics()); private void DrawGroupBox(Graphics g) { Brush textBrush = new SolidBrush(this.ForeColor); SizeF strSize = g.MeasureString(this.Text, this.Font); Brush borderBrush = new SolidBrush(this.BorderColor); Pen borderPen = new Pen(borderBrush,(float)this._borderWidth); Rectangle rect = new Rectangle(this.ClientRectangle.X, this.ClientRectangle.Y + (int)(strSize.Height / 2), this.ClientRectangle.Width - 1, this.ClientRectangle.Height - (int)(strSize.Height / 2) - 1); Brush labelBrush = new SolidBrush(this.BackColor); // Clear text and border g.Clear(this.BackColor); // Drawing Border (added "Fix" from Jim Fell, Oct 6, '18) int rectX = (0 == this._borderWidth % 2) ? rect.X + this._borderWidth / 2 : rect.X + 1 + this._borderWidth / 2; int rectHeight = (0 == this._borderWidth % 2) ? rect.Height - this._borderWidth / 2 : rect.Height - 1 - this._borderWidth / 2; // NOTE DIFFERENCE: rectX vs rect.X and rectHeight vs rect.Height g.DrawRoundedRectangle(borderPen, rectX, rect.Y, rect.Width, rectHeight, (float)this._borderRadius); // Draw text if (this.Text.Length > 0) { // Do some work to ensure we don't put the label outside // of the box, regardless of what value is assigned to the Indent: int width = (int)rect.Width, posX; posX = (this._textIndent < 0) ? Math.Max(0-width,this._textIndent) : Math.Min(width, this._textIndent); posX = (posX < 0) ? rect.Width + posX - (int)strSize.Width : posX; g.FillRectangle(labelBrush, posX, 0, strSize.Width, strSize.Height); g.DrawString(this.Text, this.Font, textBrush, posX, 0); } } #region Component Designer generated code /// 
Required designer variable.
 private System.ComponentModel.IContainer components = null; /// 
Clean up any resources being used.
 /// true if managed resources should be disposed; otherwise, false. protected override void Dispose(bool disposing) { if (disposing && (components != null)) components.Dispose(); base.Dispose(disposing); } /// 
Required method for Designer support - Don't modify!
 private void InitializeComponent() => components = new System.ComponentModel.Container(); #endregion } } 

为了使它工作，你还必须扩展基础Graphics类（注意：这是从我在这里找到的一些代码派生的，当我尝试创建圆角Panel控件时，但我找不到原始post链接到这里）：

 static class GraphicsExtension { private static GraphicsPath GenerateRoundedRectangle( this Graphics graphics, RectangleF rectangle, float radius) { float diameter; GraphicsPath path = new GraphicsPath(); if (radius <= 0.0F) { path.AddRectangle(rectangle); path.CloseFigure(); return path; } else { if (radius >= (Math.Min(rectangle.Width, rectangle.Height)) / 2.0) return graphics.GenerateCapsule(rectangle); diameter = radius * 2.0F; SizeF sizeF = new SizeF(diameter, diameter); RectangleF arc = new RectangleF(rectangle.Location, sizeF); path.AddArc(arc, 180, 90); arc.X = rectangle.Right - diameter; path.AddArc(arc, 270, 90); arc.Y = rectangle.Bottom - diameter; path.AddArc(arc, 0, 90); arc.X = rectangle.Left; path.AddArc(arc, 90, 90); path.CloseFigure(); } return path; } private static GraphicsPath GenerateCapsule( this Graphics graphics, RectangleF baseRect) { float diameter; RectangleF arc; GraphicsPath path = new GraphicsPath(); try { if (baseRect.Width > baseRect.Height) { diameter = baseRect.Height; SizeF sizeF = new SizeF(diameter, diameter); arc = new RectangleF(baseRect.Location, sizeF); path.AddArc(arc, 90, 180); arc.X = baseRect.Right - diameter; path.AddArc(arc, 270, 180); } else if (baseRect.Width < baseRect.Height) { diameter = baseRect.Width; SizeF sizeF = new SizeF(diameter, diameter); arc = new RectangleF(baseRect.Location, sizeF); path.AddArc(arc, 180, 180); arc.Y = baseRect.Bottom - diameter; path.AddArc(arc, 0, 180); } else path.AddEllipse(baseRect); } catch { path.AddEllipse(baseRect); } finally { path.CloseFigure(); } return path; } /// 
 /// Draws a rounded rectangle specified by a pair of coordinates, a width, a height and the radius /// for the arcs that make the rounded edges. /// 
 /// System.Drawing.Pen that determines the color, width and style of the rectangle. /// The x-coordinate of the upper-left corner of the rectangle to draw. /// The y-coordinate of the upper-left corner of the rectangle to draw. /// Width of the rectangle to draw. /// Height of the rectangle to draw. /// The radius of the arc used for the rounded edges. public static void DrawRoundedRectangle( this Graphics graphics, Pen pen, float x, float y, float width, float height, float radius) { RectangleF rectangle = new RectangleF(x, y, width, height); GraphicsPath path = graphics.GenerateRoundedRectangle(rectangle, radius); SmoothingMode old = graphics.SmoothingMode; graphics.SmoothingMode = SmoothingMode.AntiAlias; graphics.DrawPath(pen, path); graphics.SmoothingMode = old; } /// 
 /// Draws a rounded rectangle specified by a pair of coordinates, a width, a height and the radius /// for the arcs that make the rounded edges. /// 
 /// System.Drawing.Pen that determines the color, width and style of the rectangle. /// The x-coordinate of the upper-left corner of the rectangle to draw. /// The y-coordinate of the upper-left corner of the rectangle to draw. /// Width of the rectangle to draw. /// Height of the rectangle to draw. /// The radius of the arc used for the rounded edges. public static void DrawRoundedRectangle( this Graphics graphics, Pen pen, int x, int y, int width, int height, int radius) { graphics.DrawRoundedRectangle( pen, Convert.ToSingle(x), Convert.ToSingle(y), Convert.ToSingle(width), Convert.ToSingle(height), Convert.ToSingle(radius)); } } 

Answer 5

我不确定这适用于所有情况，但是由于这个线程，我们很快就以编程方式使用以下方式连接到Paint事件：

 GroupBox box = new GroupBox(); [...] box.Paint += delegate(object o, PaintEventArgs p) { p.Graphics.Clear(someColorHere); }; 

干杯!

Answer 6

我已经实现了相同的边界，对于新手可能更容易理解：

  private void groupSchitaCentru_Paint(object sender, PaintEventArgs e) { Pen blackPen = new Pen(Color.Black, 2); Point pointTopLeft = new Point(0, 7); Point pointBottomLeft = new Point(0, groupSchitaCentru.ClientRectangle.Height); Point pointTopRight = new Point(groupSchitaCentru.ClientRectangle.Width, 7); Point pointBottomRight = new Point(groupSchitaCentru.ClientRectangle.Width, groupSchitaCentru.ClientRectangle.Height); e.Graphics.DrawLine(blackPen, pointTopLeft, pointBottomLeft); e.Graphics.DrawLine(blackPen, pointTopLeft, pointTopRight); e.Graphics.DrawLine(blackPen, pointBottomRight, pointTopRight); e.Graphics.DrawLine(blackPen, pointBottomLeft, pointBottomRight); } 

1. 在GroupBox控件上设置Paint事件。 在此示例中，我的控件的名称是“groupSchitaCentru”。 由于参数e，人们需要这个事件。
2. 通过使用System.Drawing.Pen类设置笔对象： https ： //msdn.microsoft.com/en-us/library/f956fzw1（v = vs.110） .aspx
3. 设置表示控件所代表的矩形角的点。 使用控件的属性ClientRectangle来获取其尺寸。 我用于TopLeft（0,7），因为我想尊重控件的边框，并绘制关于其文本的线。 要获得有关坐标系统的更多信息，请访问： https ： //docs.microsoft.com/en-us/dotnet/framework/winforms/windows-forms-coordinates

我不知道，可能有助于有人想要实现这种边界调整的事情。