自定义文本框未绘制

我已经定了个规矩 TextBox 类在我的应用程序中具有自定义边框的文本框,基于 this other SO post . 如果我在窗体设计器中设置了任何新的自定义属性,它们会立即出现,直到我更改控件焦点,并且当我运行应用程序时,不会显示新的边框设置。我更新了我的表格 InitializeComponent BorderedTextBox 而不是 . 有人知道这里怎么了吗?

public class BorderedTextBox : TextBox
{
    private Color _borderColor = Color.Black;
    private int _borderWidth = 2;
    private int _borderRadius = 5;

    public BorderedTextBox() : base()
    {
        InitializeComponent();
        this.Paint += this.BorderedTextBox_Paint;
    }

    public BorderedTextBox(int width, int radius, Color color) : base()
    {
        this._borderWidth = Math.Max(1, width);
        this._borderColor = color;
        this._borderRadius = Math.Max(0, radius);
        InitializeComponent();
        this.Paint += this.BorderedTextBox_Paint;
    }

    public Color BorderColor
    {
        get => this._borderColor;
        set
        {
            this._borderColor = value;
            DrawTextBox();
        }
    }

    public int BorderWidth
    {
        get => this._borderWidth;
        set
        {
            if (value > 0)
            {
                this._borderWidth = Math.Min(value, 10);
                DrawTextBox();
            }
        }
    }

    public int BorderRadius
    {
        get => this._borderRadius;
        set
        {   // Setting a radius of 0 produces square corners...
            if (value >= 0)
            {
                this._borderRadius = value;
                this.DrawTextBox();
            }
        }
    }

    private void BorderedTextBox_Paint(object sender, PaintEventArgs e) => DrawTextBox(e.Graphics);

    private void DrawTextBox() => this.DrawTextBox(this.CreateGraphics());

    private void DrawTextBox(Graphics g)
    {
        Brush borderBrush = new SolidBrush(this.BorderColor);
        Pen borderPen = new Pen(borderBrush, (float)this._borderWidth);
        Rectangle rect = new Rectangle(
            this.ClientRectangle.X,
            this.ClientRectangle.Y,
            this.ClientRectangle.Width - 1,
            this.ClientRectangle.Height - 1);

        // Clear text and border
        g.Clear(this.BackColor);

        // Drawing Border
        g.DrawRoundedRectangle(
            borderPen,
            (0 == this._borderWidth % 2) ? rect.X + this._borderWidth / 2 : rect.X + 1 + this._borderWidth / 2,
            rect.Y,
            rect.Width - this._borderWidth,
            (0 == this._borderWidth % 2) ? rect.Height - this._borderWidth / 2 : rect.Height - 1 - this._borderWidth / 2,
            (float)this._borderRadius);
    }

    #region Component Designer generated code
    /// <summary>Required designer variable.</summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>Clean up any resources being used.</summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
            components.Dispose();

        base.Dispose(disposing);
    }

    /// <summary>Required method for Designer support - Don't modify!</summary>
    private void InitializeComponent() => components = new System.ComponentModel.Container();
    #endregion
}