label标题过长时显示...

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    public class MyLable : Label
    {
        private TextFormatFlags textOutputFormat = TextFormatFlags.WordEllipsis;
        //标题输出方式
        [Browsable(false)]
        [Localizable(false)]
        [DefaultValue(TextFormatFlags.WordEllipsis)]
        public TextFormatFlags TextOutputFormats
        {
            set
            {
                this.textOutputFormat = value;
            }
            get
            {
                return this.textOutputFormat;
            }
        }

        public MyLable()
        {
            this.Paint += new System.Windows.Forms.PaintEventHandler(PaintEvent);
        }

        //自绘 显示提示信息
        private void PaintEvent(object sender, PaintEventArgs e)
        {
            Label label = ((Label)sender);

            Graphics g = e.Graphics;

            SolidBrush blueBrush = new SolidBrush(label.BackColor);

            Rectangle rc = new Rectangle(0, 0, label.Width, label.Height);

            g.FillRectangle(blueBrush, rc);

            System.Windows.Forms.TextRenderer.DrawText(
                g, label.Text, label.Font, rc, label.ForeColor,
                this.TextOutputFormats | MyLable.ContentAlignmentToTextFormatFlags(label.TextAlign));
        }

        //从未使用MyLable　ContentAlignmentToTextFormatFlags:Void 的“this”参数。根据需要，将成员标记为 static
        static private TextFormatFlags ContentAlignmentToTextFormatFlags(ContentAlignment contentAlignment)
        {
            TextFormatFlags textFormatFlags = TextFormatFlags.Bottom;

            switch (contentAlignment)
            {
                case ContentAlignment.BottomCenter:
                    //上，左右居中
                    textFormatFlags = TextFormatFlags.Bottom | TextFormatFlags.HorizontalCenter;
                    break;
                case ContentAlignment.BottomLeft:
                    textFormatFlags = TextFormatFlags.Bottom | TextFormatFlags.Left;
                    break;
                case ContentAlignment.BottomRight:
                    textFormatFlags = TextFormatFlags.Bottom | TextFormatFlags.Right;
                    break;
                case ContentAlignment.MiddleCenter:
                    textFormatFlags = TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter;
                    break;
                case ContentAlignment.MiddleLeft:
                    textFormatFlags = TextFormatFlags.VerticalCenter | TextFormatFlags.Left;
                    break;
                case ContentAlignment.MiddleRight:
                    textFormatFlags = TextFormatFlags.VerticalCenter | TextFormatFlags.Right;
                    break;
                case ContentAlignment.TopCenter:
                    textFormatFlags = TextFormatFlags.Top | TextFormatFlags.HorizontalCenter;
                    break;
                case ContentAlignment.TopLeft:
                    textFormatFlags = TextFormatFlags.Top | TextFormatFlags.Left;
                    break;
                case ContentAlignment.TopRight:
                    textFormatFlags = TextFormatFlags.Top | TextFormatFlags.Right;
                    break;
                default:
                    break;
            }

            return textFormatFlags;
        }
    }

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