c# 循环开启多线程 lambda表达式带参数问题

[snser]

for循环开启多线程，用lambda表达式传递参数，线程里拿到的参数和传递的参数不一样，另外线程名也没有获取到。
具体的在代码里注释了，劳请各位看一下，谢啦！

        private void btnSend_Click(object sender, EventArgs e)
        {
            sendMsgManager(5);
        }

        private void sendMsgManager(int totalThreadCount)
        {
            for (int thread = 0; thread != totalThreadCount; thread++)
            {
                {
                    //这里传递的参数为0 1 2 3 4
                    Thread sendMsgThead = new Thread(() => sendMsgThreadAction(thread));
                    //这里定义了线程名
                    sendMsgThead.Name = "sendMsgThead" + thread.ToString();
                    this.Invoke((EventHandler)(delegate
                    {
                        rtxtOutput.AppendText(thread.ToString() + "&&&\n");
                    }));

                    sendMsgThead.Start();
                }
                else
                {
                    break;
                }
            }
        }

        private void sendMsgThreadAction(int startIndex)
        {
          
            this.Invoke((EventHandler)(delegate
            {
                rtxtOutput.SelectionColor = Color.Blue;
                //这里打印出的参数为1 2 3 4 5
                //这里打印出的线程名为空
                rtxtOutput.AppendText(Thread.CurrentThread.Name + " " + startIndex +"\n");
                rtxtOutput.Focus();
            }));
        }

[wmg494005678]

this.Invoke 把操作交给UI线程去处理了，你可以观察一下Thread.CurrentThread.ManagedThreadId值

[snser]

引用 1 楼 wmg494005678 的回复:

this.Invoke 把操作交给UI线程去处理了，你可以观察一下Thread.CurrentThread.ManagedThreadId值

原来如此！太谢谢了！ 那开启线程传递参数的时候值变化了是什么原因啊？

[sunny906]

        private void sendMsgManager(int totalThreadCount)
        {
            for (int thread = 0; thread != totalThreadCount; thread++)
            {

                //这里传递的参数为0 1 2 3 4
                Thread sendMsgThead = new Thread(() => sendMsgThreadAction(thread));
                //这里定义了线程名
                sendMsgThead.Name = "sendMsgThead" + thread.ToString();
                sendMsgThead.Start();
                rtxtOutput.Invoke((EventHandler)(delegate
                {
                    rtxtOutput.AppendText(thread.ToString() + "&&&\n");
                }));
            }
        }

        private void sendMsgThreadAction(int startIndex)
        {
            rtxtOutput.Invoke((EventHandler)(delegate
            {
                rtxtOutput.SelectionColor = Color.Blue;
                //这里打印出的参数为0 1 2 3 4
                //这里打印出的线程名为空
                rtxtOutput.AppendText(Thread.CurrentThread.Name + " " + startIndex + "\n");
                rtxtOutput.Focus();
            }));
        }

[xiaoyuehen]

{
                    var idx = thread;
                    //这里传递的参数为0 1 2 3 4
                    Thread sendMsgThead = new Thread(() => sendMsgThreadAction(idx));
                    //这里定义了线程名
                    sendMsgThead.Name = "sendMsgThead" + idx.ToString();
                    this.Invoke((EventHandler)(delegate
                    {
                        rtxtOutput.AppendText(idx.ToString() + "&&&\n");
                    }));
 
                    sendMsgThead.Start();
}
else
{
        break;
}

[xiaoyuehen]

{ var idx = thread; //这里传递的参数为0 1 2 3 4 Thread sendMsgThead = new Thread(() => sendMsgThreadAction(idx)); //这里定义了线程名 sendMsgThead.Name = "sendMsgThead" + idx.ToString(); this.Invoke((EventHandler)(delegate { rtxtOutput.AppendText(idx.ToString() + "&&&\n"); })); sendMsgThead.Start(); } else { break; }