/// <summary>        /// 计算字符串的面积        /// </summary>        /// <param name="msg">字符串</param>        /// <param name="labelWidth">Label标签的宽度</param>        /// <param name="labelFont">Label字体</param>        /// <returns>字符串的面积</returns>        private int GetMsgArea(string msg, float labelWidth, Font labelFont)        {            int msg_area = 0;            if (msg.Contains(‘\n‘)) //含换行符            {                string[] msg_rows = msg.Split(‘\n‘);                //测量每一行字符串的大小                foreach (string msg_row in msg_rows)                {                    int msg_row_area = GetSingleLineStringArea(msg_row, labelWidth, labelFont);                    msg_area += msg_row_area;                }            }            else //单行字符串            {                msg_area = GetSingleLineStringArea(msg, labelWidth, labelFont);            }            return msg_area;        }        /// <summary>        /// 测量单行字符串的面积        /// </summary>        /// <param name="str">单行字符串（不含换行符\n）</param>        /// <param name="labelWidth">Label的宽度</param>        /// <param name="labelFont">Label字体</param>        /// <returns>单行字符串的面积</returns>        private int GetSingleLineStringArea(string str, float labelWidth, Font labelFont)        {            Size size = TextRenderer.MeasureText(str, labelFont);            Size singleWordLength = TextRenderer.MeasureText("国", labelFont);            int rowCountOfMsgInLabel = (int)Decimal.Ceiling((decimal)size.Width / (((decimal)labelWidth) - singleWordLength.Width)); //依据label宽度分隔字符串（label容纳字体宽度实际小于自身宽度）            int msg_area = (int)(rowCountOfMsgInLabel * labelWidth * size.Height); //按label宽度分隔字符串成几行 * 行宽 * 行高            return msg_area;        }

 /// <summary>        /// 初始化消息标签        /// </summary>        private void InitLabelMsg()        {            string msg = this.message;            msg = msg.Replace("\r", ""); //去掉影响测量的\r字符            //msg = msg.Replace("\n", "");            //计算字符串的面积            int msg_area = this.GetMsgArea(msg, this.label_Msg.Width, this.label_Msg.Font);            //根据面积计算是否可以容纳消息（label自动换行的，所以长度超出label长度没事。）            int label_area = this.label_Msg.Width * this.label_Msg.Height;            float label_new_width = this.label_Msg.Width;  //label的宽、高采用float型计算，精确            float label_new_height = this.label_Msg.Height;            int msg_new_area = 0;            int label_new_area = 0;            float formProportion = (float)this.Height / (float)this.Width; //窗体高宽比例            if (msg_area > label_area) //超出面积            {                do                {                    label_new_width += 2;  //Label宽度增加                    label_new_height += 2 * formProportion;  //Label高度按比例增加                    msg_new_area = this.GetMsgArea(msg, label_new_width, this.label_Msg.Font);                    label_new_area = (int)(label_new_width * label_new_height);                    if (label_new_area >= msg_new_area) //新label大小够大了                    {                        break;                    }                } while (true);                int dx = (int)label_new_width - this.label_Msg.Width;                int dy = (int)label_new_height - this.label_Msg.Height;                int formWidth = this.Width + dx;                int formHeight = this.Height + dy;                int maxFormWidth = 800;                if (formWidth >= maxFormWidth) //最大宽度限制                {                    SetFormWidthFixed(msg, label_new_area, maxFormWidth);                }                else                {                    this.label_Msg.Width = (int)label_new_width; //Label Dock=Fill,不设置大小亦可                    this.label_Msg.Height = (int)label_new_height;                    this.Width = formWidth;                      this.Height = formHeight;                }            }            this.label_Msg.Text = msg;        }

   /// <summary>        /// 设置Form宽度固定，计算label标签大小，Form自动出现滚动条        /// </summary>        /// <param name="msg">消息</param>        /// <param name="label_area">当前label面积</param>        /// <param name="formMaxWidth">Form最大宽度</param>        private void SetFormWidthFixed(string msg ,int label_area , int formMaxWidth)        {            this.label_Msg.Dock = DockStyle.None;            float label_width = formMaxWidth - this.label_Msg.Margin.Left - this.label_Msg.Margin.Right - 10;             float label_height = (int)((float)label_area / label_width); //大致新高度            int msg_area = this.GetMsgArea(msg, label_width, this.label_Msg.Font);            int label_new_area = label_area;            do  //重新计算label的高度            {                label_height += 2;                label_new_area = (int)(label_width * label_height);                if (label_new_area >= msg_area)                {                    break;                }            } while (true);            this.label_Msg.Width = (int)label_width;            this.label_Msg.Height = (int)label_height;            float formProportion = (float)this.Height / (float)this.Width; //窗体高宽比例            this.Width = formMaxWidth;            this.Height = (int)(formMaxWidth * formProportion);            this.panel_Scroll.AutoScroll = true;        }