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c# - 为什么变量在我赋值后会重置其原始值？

问题描述

编辑：我不小心在方法中使 coor 成为局部变量。

using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 using UnityEngine.UI;

 public class Building : MonoBehaviour
 {
     [SerializeField] public int owner;
     [SerializeField] public int tpa, time, level;
     [SerializeField] public double maxHP, HP, atk, def, range, prod, cost;
     [SerializeField] private Vector2 coor;
     [SerializeField] public string type, branch;

     public static double totalprod;
     public static int actions;

     [SerializeField] bool buildStarted = false;
     [SerializeField] bool buildCompleted = false;
     int buildStartedOn;
     bool complete = false;


     public static List<Building> myBuildings = new List<Building>();

     public Vector2 Coor { get => coor;}

     public Building(double hp, int turn_per_action, double attack, double defence, double r, double pro, double c, int t, string typ, int lvl, string bra, int own, Vector2 co)//constructor
     {
         owner = own;
         HP = hp;
         tpa = turn_per_action;
         atk = attack;
         def = defence;
         range = r;
         prod = pro;
         cost = c;
         time = t;
         type = typ;
         level = lvl;
         branch = bra;
         coor = co;


     }
     private void Awake()
     {
         //Building building = new Building(HP, tpa, atk, def, range, prod, cost, time, type, level, branch, owner, coor);
         if(owner == 0)
         {
             myBuildings.Add(this);
         }


     }
     private void Update()
     {
         if(owner == 0)
         {

             if (buildCompleted)
             {

                 if (complete == false)
                 {
                     totalprod += prod;
                     if (type == "Base")
                     {
                         //tpa of base is apt
                         actions += tpa;
                     }
                     Debug.Log(coor);
                     complete = true;
                 }

             }
             else if (buildStarted == false)
             {
                 if (Currency.resource >= cost)
                 {
                     Currency.resource -= cost;
                     BuildDisplay.buildAction--;
                     Vector2 coor = NewBuilding.co;
                     Debug.Log(coor);

                     buildStarted = true;
                     buildStartedOn = Turn.turnCourt;
                 }
                 else
                 {
                     MenuManger.Messaging("no resource");
                     Destroy(gameObject);
                 }
             }
         }

         if(buildCompleted == false)
         {
             if(Turn.DeltaT(buildStartedOn) >= time)
             {
                 buildCompleted = true;
             }
         }

         if(HP <= 0)
         {
             Destroy(gameObject);
         }

     }

     public void OnBuilding()
     {
         if (buildCompleted)
         {
             if (SelectAction.isTargeting)
             {
                 if (owner != 0)
                 {
                     Attacking.TargetBuilding = this;
                     Attacking.isAttacking = true;

                 }
                 else
                 {
                     MenuManger.Messaging("invalid target");
                 }
             }
             else if (owner == 0)
             {
                 SelectAction.ActingBuilding = this;
                 MenuManger.ChangeMenu("Action", true);
             }
         }
         else
         {
             MenuManger.Messaging("incomplete building");
         }
     }
     public static List<Building> FindBuildingWithType(string tType)
     {
         var buildings = myBuildings.Where(x => x.type == tType).ToList();

         return buildings;

     }


 }

当我从检查员那里查看 coor 时，它始终为 0,0。唯一正确的时间是在分配值之后的 Debug.Log() 中。那段代码只运行一次。我将 coor 设为私有。我用crtl+F发现这是我唯一一次改变coor的值。我测试了其他变量，但没有发生这种情况。

标签： c#unity3d

解决方案

这里：

Vector2 coor = NewBuilding.co;
Debug.Log(coor);

coor是您在方法if (Currency.resource >= cost)中在块的范围内声明的局部变量（并且仅在其中可见），Update它与字段无关（例如，private Vector2 coor;您可以检查它是否添加）。尝试将代码更改为：Debug.Log(this.coor);Debug.Log(coor);

coor = NewBuilding.co;
Debug.Log(coor);

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