进度栏中的问题我无法解决 [英] problem in progressbar i can not solve it

问题描述

我在更新c#的进度栏和文本框时遇到问题.

当我尝试此代码时

I have a problem in updating the progressbar and textbox at c#.

when i tried this code

using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "1";
            for (int i = 1; i < 11; i++)
            {
                textBox1.Text = (int.Parse(textBox1.Text) + 1).ToString();
                textBox1.Refresh();
                progressBar1.Value += 10;
                progressBar1.Refresh();
                Thread.Sleep(2000);
            }
        }
    }
}

文本框和进度条的更新工作正常，并且文本很好地定期出现在文本框上.

我制作了一个具有服务器和客户端的程序，可以将文件从客户端发送到服务器

我做到了，效果很好，并在200 Mb的文件上尝试过

当我尝试制作进度条并在发送和接收操作期间将其取消时，它无法正常工作，直到程序末尾突然达到100％时，它仍然没有进展，我试图将值输出到文本框，但文本没有直到程序结束出现

当我尝试调试时，我发现文本框的文本和progressbar值正在按我的意愿进行更新，但是为什么直到程序结束它们才起作用?这是我的问题

我在其中使用进度条的那段代码

the updating of textbox and progress bar work fine and the text appear on the textbox periodically very well.

i made a program that has server and client to send a file from client to server

i did it and it work very well and i tried it on a file with size 200 Mb

when i tried to make a progressbar and apdate it during the sending and receiving operation it disnot work, it still not progress untill the end of the program go to 100 % suddenly i tried to out the value to a textbox but the text of it not appear untill the end of the program

when i tried to debug i found that the text of the textbox and the progressbar value was updating as i want but why they had no effect untill the end of the program? it is my question

the piece of code that i used the progress bar in is there

//it is a part of the sender of the file
 int i = 1;
 int value = 0;
remainsize = totalsize;//totalsize is the size of the file
while (remainsize > 1024)
{
 data = new byte[1024];
 myfile.Read(data, 0, 1024);//read 1K from the file
 myclient.Client.Send(data);//send the data to the receiver
 data = new byte[2];
 myclient.Client.Receive(data);//wait for OK from the receiver
 if (Encoding.ASCII.GetString(data) != "OK")
 {
      MessageBox.Show("SOMETHING WRONG!!");
       myclient.Close();
       this.Close();
      Application.Exit();
 }
  remainsize -= 1024;
  value+=5;/*increment value here with 5 to test i will update it in my code after solving it*/
  textBox3.Text = value.ToString();//update the textbox
  textBox3.Refresh();//refresh it to appear the text ///do not appear any thing
  progressbar1.value=value;//update the value of the progressbar
  progressbar1.Refresh();
  System.Threading.Thread.Sleep(2000);/* thought the problem in timing and i used this but with no use*/

如果您要我上传所有项目，请告诉我，我将执行此操作

if you want me to upload all the project tell me and i will do this

推荐答案

您好，

这是因为您使用的是一个线程，并且UI元素不会定期刷新.如果要解决此问题，建议您创建另一个线程来处理文件，并且该线程将更新UI元素.

http://blogs.msdn.com/b/csharpfaq/archive/2004/03/17/91685.aspx [ ^ ]

http://stackoverflow.com/Problems/1136399/how-to-update-textbox-on-gui-from-another-thread-in-c-sharp [> http://stackoverflow.com/questions/519233/writing-to-a- textbox-from-another-thread [ ^ ]

或在工作线程(处理文件的线程)中使用

Hi,

this is because you are using one thread and UI elements are not refreshed regularly. If you want to fix this problem I advice you to create another thread that will process your files and this thread will updates UI elements.

http://blogs.msdn.com/b/csharpfaq/archive/2004/03/17/91685.aspx[^]

http://stackoverflow.com/questions/1136399/how-to-update-textbox-on-gui-from-another-thread-in-c-sharp[^]

http://stackoverflow.com/questions/519233/writing-to-a-textbox-from-another-thread[^]

or in worker thread (thread which process files) use

...
this.Invoke(new MethodInvoker(delegate
{
                textBox1.Text = (int.Parse(textBox1.Text) + 1).ToString();
                textBox1.Refresh();
                progressBar1.Value += 10;
                progressBar1.Refresh();

}));
...

问候
Robert

Regards
Robert

您发布的代码使用一个线程.这意味着每个操作在上一个操作完成后都将按顺序执行.
由于您可以立即更新GUI元素，因此我假设代码将从主线程(也称为"GUI线程")运行.阻塞GUI线程导致GUI(图形用户界面")在有空闲时间之前不会更新.

我看到的阻塞调用是myClient.Client.Receive()和System.Threading.Thread.Sleep().

不要在GUI线程上睡眠().
不要在GUI线程中使用可能很长的阻塞调用("Receive()").

让这些操作在 BackgroundWorker [

The code you posted uses one thread. That means every operation is excuted in sequence right after the previous one finished.
Since you can update GUI elements right away, I suppose the code to be run from main thread (a.k.a "GUI thread"). Blocking the GUI thread results in the GUI ("Graphical User Interface") not updating until there is some idle time for it.

The blocking calls I see are myClient.Client.Receive() and System.Threading.Thread.Sleep().

Don''t Sleep() the GUI thread.
Don''t use potentially long blocking calls ("Receive()") in the GUI thread.

Let those operations run in a BackgroundWorker[^].
Use its ReportProgress() method and ProgressChanged event to update the GUI.

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