C#的ref示例

记录ref的用法如下：

public class ValueTransfer
{
    private int num1 = 1;
    private Vector2 _vector2;
        
    public void Main()
    {
        _vector2 = Vector2.Zero;
            
        SetValueNoRef(num1);
        PrintValue();
        // num1 = 1
        SetValue(ref num1);
        PrintValue();
        // num1 = 22

        SetVector2NoRef(_vector2);
        PrintVector2();
        // vector2.x = 0 , vector2.y = 0
        SetVector2(ref _vector2);
        PrintVector2();
        // vector2.x = 3 , vector2.y = 4
    }

    private void SetValueNoRef(int pValue)
    {
        pValue = 10;
    }
        
    private void SetValue(ref int pValue)
    {
        pValue = 22;
    }

    private void PrintValue()
    {
        Console.WriteLine("num1 = {0}",num1);
    }
        
    private void SetVector2NoRef(Vector2 vector2)
    {
        vector2 = new Vector2(1,2);
    }
        
    private void SetVector2(ref Vector2 vector2)
    {
        vector2 = new Vector2(3,4);
    }

    private void PrintVector2()
    {
        Console.WriteLine("vector2.x = {0} , vector2.y = {1}" , _vector2.X , _vector2.Y);
    }
}

此示例展示函数中，只是传入了值，还是把它原有地址传入，当操作这个变量时，所产生的结果就不一样。