很抱歉挖了坟墓，但我已经与这个问题斗争了一段时间，终于想出了一种方法来处理这些多重发射事件。我想要感谢这篇文章中的每一个人，因为我在与这个问题作斗争时已经在许多参考文献中使用了它。

这是我的完整代码。它使用字典来跟踪文件最后一次写入的日期和时间。它比较该值，如果值相同，则抑制事件。然后在启动新线程后设置该值。

using System.Threading; // used for backgroundworker
using System.Diagnostics; // used for file information
private static IDictionary<string, string> fileModifiedTable = new Dictionary<string, string>(); // used to keep track of our changed events

private void fswFileWatch_Changed( object sender, FileSystemEventArgs e )
    {
        try
        {
           //check if we already have this value in our dictionary.
            if ( fileModifiedTable.TryGetValue( e.FullPath, out sEmpty ) )
            {              
                //compare timestamps      
                if ( fileModifiedTable[ e.FullPath ] != File.GetLastWriteTime( e.FullPath ).ToString() )
                {        
                    //lock the table                
                    lock ( fileModifiedTable )
                    {
                        //make sure our file is still valid
                        if ( File.Exists( e.FullPath ) )
                        {                               
                            // create a new background worker to do our task while the main thread stays awake. Also give it do work and work completed handlers
                            BackgroundWorker newThreadWork = new BackgroundWorker();
                            newThreadWork.DoWork += new DoWorkEventHandler( bgwNewThread_DoWork );
                            newThreadWork.RunWorkerCompleted += new RunWorkerCompletedEventHandler( bgwNewThread_RunWorkerCompleted );

                            // capture the path
                            string eventFilePath = e.FullPath;
                            List<object> arguments = new List<object>();

                            // add arguments to pass to the background worker
                            arguments.Add( eventFilePath );
                            arguments.Add( newEvent.File_Modified );

                            // start the new thread with the arguments
                            newThreadWork.RunWorkerAsync( arguments );

                            fileModifiedTable[ e.FullPath ] = File.GetLastWriteTime( e.FullPath ).ToString(); //update the modified table with the new timestamp of the file.
                            FILE_MODIFIED_FLAG.WaitOne(); // wait for the modified thread to complete before firing the next thread in the event multiple threads are being worked on.
                        }
                    }
                }
            }
        }
        catch ( IOException IOExcept )
        {
            //catch any errors
            postError( IOExcept, "fswFileWatch_Changed" );
        }
    }

简单地定义一个全局变量var1 = true。

Private Sub FileWatchman_Changed(ByVal sender As System.Object, ByVal e As System.IO.FileSystemEventArgs) Handles FileWatchman.Changed
   If var1 = true 
       your logic goes here
       var1 = false
   Else
       var1 = true 
   End If
End Sub

FileReadTime = DateTime.Now;

private void File_Changed(object sender, FileSystemEventArgs e)
{            
    var lastWriteTime = File.GetLastWriteTime(e.FullPath);
    if (lastWriteTime.Subtract(FileReadTime).Ticks > 0)
    {
        // code
        FileReadTime = DateTime.Now;
    }
}

我可以通过添加一个函数来检查缓冲区数组中的重复项来做到这一点。

然后使用计时器在数组X时间内未被修改后执行该操作: -每次有东西写入缓冲区时重置计时器 —对tick执行动作

这还捕获了另一种复制类型。如果修改文件夹内的文件，该文件夹也会引发Change事件。

Function is_duplicate(str1 As String) As Boolean
    If lb_actions_list.Items.Count = 0 Then
        Return False
    Else
        Dim compStr As String = lb_actions_list.Items(lb_actions_list.Items.Count - 1).ToString
        compStr = compStr.Substring(compStr.IndexOf("-") + 1).Trim

        If compStr <> str1 AndAlso compStr.parentDir <> str1 & "\" Then
            Return False
        Else
            Return True
        End If
    End If
End Function

Public Module extentions
<Extension()>
Public Function parentDir(ByVal aString As String) As String
    Return aString.Substring(0, CInt(InStrRev(aString, "\", aString.Length - 1)))
End Function
End Module

这个代码对我有用。

        private void OnChanged(object source, FileSystemEventArgs e)
    {

        string fullFilePath = e.FullPath.ToString();
        string fullURL = buildTheUrlFromStudyXML(fullFilePath);

        System.Diagnostics.Process.Start("iexplore", fullURL);

        Timer timer = new Timer();
        ((FileSystemWatcher)source).Changed -= new FileSystemEventHandler(OnChanged);
        timer.Interval = 1000;
        timer.Elapsed += new ElapsedEventHandler(t_Elapsed);
        timer.Start();
    }

    private void t_Elapsed(object sender, ElapsedEventArgs e)
    {
        ((Timer)sender).Stop();
        theWatcher.Changed += new FileSystemEventHandler(OnChanged);
    }

一直在寻找答案，但我想到了一个肮脏的解决方案。因为我的事件触发了两次，所以第二个动作什么也不做。

       $count = 1
       $action = { 
            if($count -eq 1){                  
                #DO SOMETHING
                $count = 2 
            }else{
                $count = 1
            }
        }