leeyupeng

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Destroy

发表于 更新于 分类于 ， 阅读次数： Valine：

Destroy()函数调用之后，对象会销毁么？

Destroy(obj) delay Destroy之后，调用objC#类对象某些方法会抛MissingReferenceException异常，一些方法不会抛异常;
此时objC#类对象内存回收了么？
Destroy(obj) delay Destroy之后，将obj引用置空，会抛NullReferenceException异常；
此时objC#类对象内存回收了么？

Destroy()函数调用之后,引用是Null？

MissingReferenceException

NullReferenceException

Object基类重载了 == ！= bool 运算符

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public static bool operator == (Object x,Object y);
public static bool operator != (Object x,Object t);
public static implicit operator bool(Object exists);

测试代码

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Obj : MonoBehaviour
{
    public string str;
    public string str2;
    public void setstr2(string _str2)
    {
        str2 = _str2;
    }
    public string getstr2()
    {
        return str2;
    }
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

    }
}
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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Control : MonoBehaviour
{
    public Obj m_obj;
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
    }

    private void OnGUI()
    {
        //1.Destroy Script not m_obj = null時 拋異常 MissingReferenceException
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(0, 0, 100, 100), "m_obj  name"))
        {
            m_obj.name = "name" + Random.Range(1,1000);
        }
        //1.Destroy Script not m_obj = null時 有效，無異常
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(100, 0, 100, 100), "m_obj  str"))
        {
            m_obj.str = "testobj" + Random.Range(1, 1000);
        }
        //1.Destroy Script not m_obj = null時 有效，無異常
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(200, 0, 100, 100), "m_obj setstr2"))
        {
            m_obj.setstr2("testobj" + Random.Range(1, 1000));
        }
        //1.Destroy Script not m_obj = null時 有效，無異常
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(0, 100, 100, 100), "m_obj.GetHashCode()"))
        {
            Debug.Log(m_obj.GetHashCode());
        }        }

        //1.Destroy Script not m_obj = null時 拋異常 MissingReferenceException
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(100, 100, 100, 100), "m_obj.name"))
        {
            Debug.Log(m_obj.name);
        }
        //1.Destroy Script not m_obj = null時 有效，無異常
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(200, 100, 100, 100), "m_obj.str"))
        {
            Debug.Log(m_obj.str);
        }
        //1.Destroy Script not m_obj = null時 有效，無異常
        //2.Destroy Script and m_obj = null時 拋異常 NullReferenceException
        if (GUI.Button(new Rect(300, 100, 100, 100), "m_obj.getstr2()"))
        {
            Debug.Log(m_obj.getstr2());
        }

        //1.Destroy Script not m_obj = null時 true
        //2.Destroy Script and m_obj = null時 true
        if (GUI.Button(new Rect(400, 100, 100, 100), "m_obj == null"))
        {
            Debug.Log(m_obj== null);
        }

        //1.Destroy Script not m_obj = null時 false
        //2.Destroy Script and m_obj = null時 false
        if (GUI.Button(new Rect(500, 100, 100, 100), "m_obj==true"))
        {
            Debug.Log(m_obj==true);
        }

        if (GUI.Button(new Rect(100,200,100,100),"Destroy GameObject"))
        {
            Destroy(m_obj.gameObject);

        }

        if (GUI.Button(new Rect(200, 200, 100, 100), "Destroy Script not m_obj = null"))
        {
            Destroy(m_obj);
        }

        if (GUI.Button(new Rect(300, 200, 100, 100), "Destroy Script and m_obj = null"))
        {
            Destroy(m_obj);
            m_obj = null;
        }
    }
}