【C#】根据分数求出相应的成绩等级

public static String getReport(String garde)
        {
            try
            {
                double score = double.Parse(garde);
                if (score > 100 || score < 0)
                {
                    return "数据超出限定范围（0-100）";
                }
                else if (score >= 90)
                {
                    return "优秀";
                }
                else if (score >= 80)
                {
                    return "良好";
                }
                else if (score >= 70)
                {
                    return "中等";
                }
                else if (score >= 60)
                {
                    return "及格";
                }
                else 
                {
                    return "不及格";
                }
            }
            catch (Exception e)
            {
                return e.Message;
            }
            finally { }
        }

private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(getReport((textBox1.Text)));
        }
        /// <summary>
        /// 根据分数求出成绩等级
        /// </summary>
        /// <param name="garde"></param>
        /// <returns>String 返回相应的等级 或者 错误信息</returns>
        public static String getReport(String garde) {
            try
            {
                double score = double.Parse(garde);
                if (score > 100 || score < 0) return "数据超出限定范围（0-100）";
                int fs = (int)score / 10;
                switch (fs)
                {
                    case 10:
                    case 9: return "优秀";
                    case 8: return "良好";
                    case 7: return "中等";
                    case 6: return "及格";
                    default: return "不及格";
                }
            }
            catch (Exception e)
            {
                return e.Message;
            }
            finally { }
        }C# 折叠 复制 全屏