Winform自定义控件边框

定义边框属性类，分别可以用来设置上下左右4个边框的宽度、颜色以及样式.

[TypeConverter(typeof(BorderStyleConverter))]//[Editor(typeof(BorderStyleEditor), typeof(UITypeEditor))]public class Border    {        public int TopWidth { get; set; }        public int RightWidth { get; set; }        public int BottomWidth { get; set; }        public int LeftWidth { get; set; }        public Color TopColor { get; set; }        public Color RightColor { get; set; }        public Color BottomColor { get; set; }        public Color LeftColor { get; set; }        public ButtonBorderStyle TopBorderStyle { get; set; }        public ButtonBorderStyle RightBorderStyle { get; set; }        public ButtonBorderStyle BottomBorderStyle { get; set; }        public ButtonBorderStyle LeftBorderStyle { get; set; }    }

定义边框属性转换器

public class BorderStyleConverter : ExpandableObjectConverter{public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType){if (destinationType == typeof(string)){return true;}return base.CanConvertTo(context, destinationType);}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType){if (destinationType == typeof(string) && value is Border){Border border = (Border)value;return string.Format("{0},{1},{2},{3},{4},{5},{6},{7},{8},{9},{10},{11}",border.TopWidth, border.RightWidth, border.BottomWidth, border.LeftWidth,border.TopColor.Name, border.RightColor.Name, border.BottomColor.Name, border.LeftColor.Name,border.TopBorderStyle, border.RightBorderStyle, border.BottomBorderStyle, border.LeftBorderStyle);}return base.ConvertTo(context, culture, value, destinationType);}
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType){if (sourceType == typeof(string)){return true;}return base.CanConvertFrom(context, sourceType);}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value){if (value is string){try{string[] pieces = ((string)value).Split(',');if (pieces.Length == 12){Border border = new Border();border.TopWidth = int.Parse(pieces[0]);border.RightWidth = int.Parse(pieces[1]);border.BottomWidth = int.Parse(pieces[2]);border.LeftWidth = int.Parse(pieces[3]);border.TopColor = Color.FromName(pieces[4]);border.RightColor = Color.FromName(pieces[5]);border.BottomColor = Color.FromName(pieces[6]);border.LeftColor = Color.FromName(pieces[7]);border.TopBorderStyle = (ButtonBorderStyle)Enum.Parse(typeof(ButtonBorderStyle), pieces[8]);border.RightBorderStyle = (ButtonBorderStyle)Enum.Parse(typeof(ButtonBorderStyle), pieces[9]);border.BottomBorderStyle = (ButtonBorderStyle)Enum.Parse(typeof(ButtonBorderStyle), pieces[10]);border.LeftBorderStyle = (ButtonBorderStyle)Enum.Parse(typeof(ButtonBorderStyle), pieces[11]);return border;}}catch{throw new ArgumentException("Invalid value for BorderStyle.");}}return base.ConvertFrom(context, culture, value);}}

定义设计编辑器的相关属性（可在VS属性窗口实现下拉框或者弹出式的输入编辑）

public class BorderStyleEditor : UITypeEditor{public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context){return UITypeEditorEditStyle.DropDown;}
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value){return value;}}

自定义控件实现，引入Border类，并在OnPaint事件中进行边框绘制

private Border _BorderStyle;[Description("设置边框样式")]public new Border BorderStyle{get { return _BorderStyle; }set{_BorderStyle = value;Invalidate();}}protected override void OnPaint(PaintEventArgs e)        {            base.OnPaint(e);            if (BorderStyle != null)            {                ControlPaint.DrawBorder(e.Graphics, ClientRectangle,                                        BorderStyle.LeftColor, BorderStyle.LeftWidth, BorderStyle.LeftBorderStyle, //左边                                        BorderStyle.TopColor, BorderStyle.TopWidth, BorderStyle.TopBorderStyle, //上边                                        BorderStyle.RightColor, BorderStyle.RightWidth, BorderStyle.RightBorderStyle, //右边                                        BorderStyle.BottomColor, BorderStyle.BottomWidth, BorderStyle.BottomBorderStyle);//底边            }
        }

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