线程 - 有困难。我究竟做错了什么？ [英] Threading-Having difficulty. What am I doing wrong?

问题描述

我已经创建了一个线程（或者我正在尝试），它将每隔这么多分钟自动保存。我添加了一个计时器（timer1）。每当我单击按钮启动线程时，程序都不会按照指示自动保存。所以我正在寻求帮助。这是代码：



注意：我在顶部添加了此代码：

 使用 System.Threading; 

我创建了两个线程（t1和t2）来查看它是否会产生影响。也许我只需要一个线程来引用。

  public   partial   class   frmFindAndReplace  ： 表格 
 {
 主题 t1;  //  我添加了两个线程，以便可以在事件中访问它们 
  Thread  t2;  //  例如，FormClosing事件 

  private   void  timer1_Tick（ object  sender，EventArgs e）
 {
 progressBar1.Increment（ 1 ）; 
 lblUpdate.Visible =  false ; 
 lblSaving.Visible =  true ; 
} 
 私有  void  AutoSave（）
 {
 timer1.Start（）; 
 
  if （SaveDoc.FileName！=  ）
 {
 CreateWordDocument（FilePath，SaveDoc.FileName，pathImage）; 
 MessageBox.Show（ 已更新）; 
  return ; 
} 
  else  
 {
  if （SaveDoc .ShowDialog（）== DialogResult.OK）
 {
 CreateWordDocument（FilePath，SaveDoc.FileName，pathImage）; 
 MessageBox.Show（  New Save）; 
  return ; 
} 
} 
 lblSaving.Visible =  false ; 
 lblUpdate.Visible =  true ; 
} 
 

单击另存为按钮后，AutoSave方法将开始。

 私人  void  saveAsToolStripMenuItem_Click（ object  sender，EventArgs e）
 {
 t1 =  new  Thread（自动保存）; 
} 

保存按钮相同。

< pre lang =cs> private void saveToolStripMenuItem_Click（ object sender，EventArgs e）
{
t2 = new 线程（AutoSave）;
}

还有FormClosing事件的问题。每次运行程序时都会收到错误。

  private   void  frmFindAndReplace_FormClosing（ object  sender，FormClosingEventArgs e）
 {
  if （t1.IsAlive）
 {t1.Abort（）; }  //   t1.Abort（）在退出时关闭t1线程。 
 
  if （t2.IsAlive）
 {t2.Abort（）; }  //   t2.Abort（）在退出时关闭t2线程。 
} 

解决方案

嗯。

如果你想每五分钟自动保存一次，我会更简单地做。

设置一个线程并启动它。

  private 线程保护程序; 
 ... 
 saver =  new 线程（ new  ThreadStart（SaveRegularly）） ; 
 saver.Start（）; 

线程方法保存：

  private   bool  stopAndDie =  false ; 
  private   void  SaveRegularly（）
 {
 DateTime saveDueAt = DateTime .Now.AddMinutes（ 5 ）; 
  do  
 {
 Thread.Sleep（ 1000 ）; 
  if （DateTime.Now >  = saveDueAt）
 {
  //  保存 
 ... 
 saveDueAt = DateTime.Now .AddMinutes（ 5 ）; 
} 
}  while （！stopAndDie）; 
} 

您还处理表单结束事件，并将stopAndDie设置为true，然后使用Thread.Join等待它退出：

 stopAndDie =  true ; 
 saver.Join（ 2000 ）; 
 

I've created a thread (or I'm trying to) which will autosave every so many minutes. I've added a timer (timer1). Whenever I click the button to start the thread, the program doesn't autosave as instructed. So I'm reaching out for help. Here's the code:

Note: I've added this code at the top:

using System.Threading;

I created two threads (t1 & t2) to see if it would make a difference. Maybe I only need one thread to refer to.

public partial class frmFindAndReplace : Form
    {
        Thread t1;  //I added the two threads so they can be accessed in events
        Thread t2;  //eg, the FormClosing event

private void timer1_Tick(object sender, EventArgs e)
{
    progressBar1.Increment(1);
    lblUpdate.Visible = false;
    lblSaving.Visible = true;
}
private void AutoSave()
{
    timer1.Start();

    if (SaveDoc.FileName != "")
    {
        CreateWordDocument(FilePath, SaveDoc.FileName, pathImage);
        MessageBox.Show("Updated");
        return;
    }
    else
    {
        if (SaveDoc.ShowDialog() == DialogResult.OK)
        {
            CreateWordDocument(FilePath, SaveDoc.FileName, pathImage);
            MessageBox.Show("New Save");
            return;
        }
    }
    lblSaving.Visible = false;
    lblUpdate.Visible = true;
}

Once the Save As button has been clicked, the AutoSave method will begin.

private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            t1 = new Thread(AutoSave);           
        }

Same for the Save button.

private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            t2 = new Thread(AutoSave);            
        }

Also having a problem with the FormClosing event. I receive an error everytime I run the program.

private void frmFindAndReplace_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (t1.IsAlive)  
            { t1.Abort(); } //t1.Abort() closes the t1 thread upon exit.

            if (t2.IsAlive)
            { t2.Abort(); } //t2.Abort() closes the t2 thread upon exit.
        }

解决方案

Um.
If you want to autosave every five minutes, I'd do it rather more simply.
Set up a Thread and start it.

            private Thread saver;
...
            saver = new Thread(new ThreadStart(SaveRegularly));
            saver.Start();

The thread method soes teh save:

private bool stopAndDie = false;
private void SaveRegularly()
    {
    DateTime saveDueAt = DateTime.Now.AddMinutes(5);
    do
        {
        Thread.Sleep(1000);
        if (DateTime.Now >= saveDueAt)
            {
            // Do your save
            ...
            saveDueAt = DateTime.Now.AddMinutes(5);
            }
        } while (!stopAndDie);
    }

You also handle the form closing event, and set stopAndDie to true, then use Thread.Join to wait for it to exit:

stopAndDie = true;
saver.Join(2000);

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