Unity:文本输入框进行数值判定

实现目标：对输入框中的数值进行判定

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class Calculate : MonoBehaviour
{
    public InputField zhiliangdenshu;//质量分数
    public InputField dianya;//电压
    public InputField liuliang;//流量
    public InputField pentou_d;//喷头直径
    public Text showText;
    double dianyaValue;//电压值
    double liuliangValue;//流量值
    double pentou_dValue;//喷头直径
       public void calculateValue()
    {
        if (IsSpace(zhiliangdenshu.text.ToString())||IsSpace(dianya.text.ToString())||IsSpace(liuliang.text.ToString()) ||IsSpace(liuliang.text.ToString()))//如果为空
        {
            showText.text="某项输入为空";
            lineShow.SetActive(false);
        }
        else
        {
            dianyaValue = Convert.ToDouble(dianya.text.ToString());//string转为double
            switch (zhiliangdenshu.text.ToString())//switch判断质量分数text字符串
            {
                case "4%":
                    if (( dianyaValue>15&&dianyaValue<19)&& (liuliangValue> 0.5f&&liuliangValue <2.0f) && (pentou_dValue> 0.5f&&pentou_dValue<1.0f))//判断数值区间
                    {
                        lineShow.transform.localScale = new Vector3(1.5f, 0.5f, 0.5f);
                        //图片大小形式设置
                    }
                    else
                    {
                        showText.text = "输入值不在测量范围内";
                        lineShow.SetActive(false);
                    }; break;
                default:
                    showText.text = "质量分数输入有误";
                    lineShow.SetActive(false);
                    break;
            }
        }
    }
    //检测空格
    private bool IsSpace(string textValue)
    {
        if (textValue.Trim().Length == 0)//去掉字符串头尾的空格
        {
            return true;
        }
        return false;
    }