右键单击DataGrid某行，让当前行变成Selected选择状态

void _dgMarketPrice_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right) //判断是不是右键
            {
                Control control = new Control();
                Point ClickPoint = new Point(e.X, e.Y);
                control.GetChildAtPoint(ClickPoint);
                if (this._dgMarketPrice.HitTest(e.X, e.Y).Row >= 0 && _dgMarketPrice.HitTest(e.X, e.Y).Column >= 0)//判断点的是不是一个行里
                {
                    this._dgMarketPrice.CurrentRowIndex = this._dgMarketPrice.HitTest(e.X, e.Y).Row;
                }
            }
        }