c# 类和自定义控件的自定义事件

namespace WindowsFormsApplication1
{
    class PressValue : EventArgs
    {
        public int value { set; get; }
    }
    
    class svs
    {
        public delegate void UserDelegate(object sender, PressValue pValue);//建立事件委托
        public event UserDelegate Ons;//定义事件

        public virtual void OnUserDelegate(PressValue s)//建立事件
        {
            Ons(null, s);//调用委托
        }

        public void okgo()//测试方法
        {
            for (int i = 0; i <= 100; i++)
            {
                Thread.Sleep(50);
                PressValue e = new PressValue();
                e.i = i;
                OnUserDelegate(e);//触发事件
            }
        }
    }
}

调用类

private void Form1_Load(object sender, EventArgs e)
        {
            Thread t = new Thread(new ThreadStart(s));
            t.IsBackground = true;
            t.Start();
        }
        void s()
        {
            svs s = new svs();//实例化类
            s.Ons += new svs.UserDelegate(s_Ons);//建立事件函数
            s.okgo();//调用类方法
        }

        void s_Ons(object sender, PressValue s)
        {
            this.Invoke(new MethodInvoker(delegate() { this.progressBar1.Value = s.value; this.Text = s.value.ToString(); }));//委托窗体更新progressBar和Text
        }