《unity游戏优化》第8章内存优化

class Program
{
    static void Main(string[] args)
    {
        int i = 128;
        object obj = i;
        obj = 512f;
        i = (int)obj;
    }
    //尝试将obj拆箱到一个不是最新赋值的类型时，将引发
    //Unhandled exception. System.InvalidCastException: Unable to cast object of type 'System.Single' to type 'System.Int32'.
}

public class DamageResult {
 public Character attacker;
 public Character defender;
 public int totalDamageDealt;
 public DamageType damageType;
 public int damageBlocked;
 // etc.
}
public void DealDamage(Character _target) {
 DamageResult result = CombatSystem.Instance.CalculateDamage(this,
_target);
 CreateFloatingDamageText(result);
}
public struct DamageResult {
 // ...
}
//当使用目的是在向程序某处发送数据库，且数据的持续时间不需要超过
//当前作用域，那么可以使用struct来替代

TestStruct[] dataObj = new TestStruct[1000];
for(int i = 0; i < 1000; ++i) {
 dataObj[i].data = i;
 DoSomething(dataObj[i]);
}
However, the following, functionally equivalent, code would not result in any heap
allocations since the struct objects being used are value types, and hence, it would be
created on the stack:
for(int i = 0; i < 1000; ++i) {
 TestStruct dataObj = new TestStruct();
 dataObj.data = i;
 DoSomething(dataObj);
}

void TestFunction() {
    string testString = "Hello";
    DoSomething(testString);
    Console.WriteLine(testString);
    //Debug.Log(testString);
}
void DoSomething(string localString) {
    localString = "World!";
}
TestFunction();
这个代码还是打印hello

public struct MyStruct {
 int myInt;
 float myFloat;
 bool myBool;
 string myString;
}
MyStruct[] arrayOfStructs = new MyStruct[1000];
对比
int[] myInts = new int[1000];
float[] myFloats = new float[1000];
bool[] myBools = new bool[1000];
string[] myStrings = new string[1000];