//错误写法
    void SetEmissionRate (GameObject pGo, float pValue)
    {
        ParticleSystem tParticleSystem = pGo.GetComponentInChildren<ParticleSystem> ();
        tParticleSystem.emission.rate = new ParticleSystem.MinMaxCurve (pValue);
    }

上述写法编译报错。

    //正确写法
    void SetEmissionRate (GameObject pGo, float pValue)
    {
        ParticleSystem tParticleSystem = pGo.GetComponentInChildren<ParticleSystem> ();
        ParticleSystem.EmissionModule emission = tParticleSystem.emission;
        emission.rate = new ParticleSystem.MinMaxCurve (pValue);
    }

面板中数值没有变，但实际执行效果已经修改

参考

粒子系统模块 – 问答