大家帮我看看。这段代码为什么还会造成UI卡死

Question

 private void pbCode_Click(object sender, EventArgs e)
        {
            new Thread(new ThreadStart(GetImage)).Start();
        }        /// <summary>
        /// 验证码
        /// </summary>
        private void GetImage()
        {
            if (this.InvokeRequired)
            {
                DelegatObject c = new DelegatObject(GetImage);
                this.BeginInvoke(c); 
            }
            else
            {
                this.loadCheckImage.Visible = true;
                this.loadCheckImage.Start();
                this.pbCode.Image = Data.BabyHelper.GetImage(HttpHelper.Cookie);
                this.txtCode.Focus();
                this.loadCheckImage.Stop();
                this.loadCheckImage.Visible = false;
            }
        }loadCheckImage，pbCode，txtCode均是控件

Answer 1

Form的Invoke的实质就是通过windows消息让函数得以在UI线程得以执行.
你这里的新线程干的就是这样的事:
告诉UI线程要它去取图片->等待UI线程执行完任务->结束.
和直接在UI线程里执行没区别当然会卡死.

Answer 2

开个新的线程去执行，在执行结束或者需要操作UI的时候才用form的Invko

Answer 3

Data.BabyHelper.GetImage(HttpHelper.Cookie);
在执行这个的时候开线程，象你那样新线程还是返回UI线程来做的

Answer 4

 class Class1
    {
        private ImageGetThread imageThread;
        private delegate void safetyDele(string url);        public Class1()
        { 
        
        }        public void loadImages()
        {
            imageThread  = new ImageGetThread();
            imageThread.imageLoaded += new ImageGetThread.getImageDele(imageThread_imageLoaded);
        }        void imageThread_imageLoaded()
        {
            //在这里做界面的更新      
        }
               
    }    class ImageGetThread
    {
        public string imgUrl = "";        public delegate void getImageDele();
        public event getImageDele imageLoaded;        public ImageGetThread()
        { 
            Thread thed = new Thread(new ParameterizedThreadStart(work));
            thed.Start();
        }        public void work()
        { 
            //在这里写你获取IMAGE的代码就行了
            imgUrl = "你要做的事情";
            //获取完毕，激发事件，通知UI部分更新
            imageLoaded();
        }
    }