.net 在文本框中更改选定的文本背景色

我想知道如何为文本框中的选定文本实现自定义背景色。默认情况下，它对所选文本使用windows的标准颜色（浅蓝色）。由于我使用的是基于winforms TextBox的皮肤文本编辑器，并且TextBox不公开任何属性来更改颜色，我想知道是否有其他方法可以在应用程序级别更改此系统默认颜色

谢谢

汤姆

也许这有助于

public class MyTextBox : System.Windows.Forms.TextBox
    {
        private const int WM_PAINT = 0x000F;

        public MyTextBox()
        {
            this.TextChanged += new System.EventHandler(this.myTextBox_TextChanged);

        }

        private void myTextBox_TextChanged(object sender, System.EventArgs e)
        {
        }


        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]    
        protected override void WndProc(ref Message m) 
        {
            base.WndProc(ref m);    
            // Listen for operating system messages.
            switch (m.Msg)
            {
                case WM_PAINT:
                    PaintEventArgs pe = new PaintEventArgs(this.CreateGraphics(),this.RectangleToScreen(this.ClientRectangle));
                    this.OnPaint(pe);
                    break;
            }

        }

        protected override void OnPaint(PaintEventArgs pe)
        {
    // call base.OnPaint(pe);
            Graphics g = pe.Graphics;
            g.Clear(this.BackColor);
            string s = this.Text.Substring(0,this.Text.Length/2);
   // provide a object with how to split your string with colors
            string s1 =  this.Text.Substring(this.Text.Length/2);
            SizeF sf = g.MeasureString(s,this.Font);
            g.DrawString(s,this.Font,new SolidBrush(Color.Red),0,0);

            g.DrawString(s1,this.Font,new SolidBrush(Color.Black),sf.Width,0);
        }
    }