上效果：

代码：

        private void Form1_Load(object sender, EventArgs e)
        {
            this.linkLabel1.Paint += linkLabel1_Paint;
            this.linkLabel1.Text = "群会议成员(2/13)";
            this.linkLabel1.LinkBehavior = System.Windows.Forms.LinkBehavior.NeverUnderline;
            this.linkLabel1.LinkColor = Color.Black;
        }

        private void linkLabel1_Paint(object sender, PaintEventArgs e)
        {
            string str = linkLabel1.Text;
            string strA = str.Substring(0, 10);
            string strB = str.Substring(0, 8);
            string strC = str.Substring(0, 7);
            string strD = str.Substring(0, 6);
            Point point = new Point(linkLabel1.Padding.Left, linkLabel1.Padding.Top);
            TextRenderer.DrawText(e.Graphics, str, linkLabel1.Font, point, Color.Black);
            TextRenderer.DrawText(e.Graphics, strA, linkLabel1.Font, point, Color.Blue);
            TextRenderer.DrawText(e.Graphics, strB, linkLabel1.Font, point, Color.Black);
            TextRenderer.DrawText(e.Graphics, strC, linkLabel1.Font, point, Color.Red);
            TextRenderer.DrawText(e.Graphics, strD, linkLabel1.Font, point, Color.Black);
        }