Question

我目前正在完成我的家庭作业计划:)一切顺利，直到我坚持这个问题一段时间，我无法弄清楚它为什么不起作用。简而言之，我需要启用（如果文件存在）或禁用某些动态按钮。我使用带有计时器的FileSystemWatcher来检查女巫的某些文件夹.txt文件是由另一个Windows应用程序表单创建的。所以我想启用按钮，如果文件夹上出现某个文件，但我的代码不起作用。有人可以说为什么我的代码不起作用或问题可能隐藏在哪里？

namespace WindowsFormsApplication8
{
    public partial class Form1 : Form
    {
    public Form1()
    {
        InitializeComponent();
    }
    string[] stalnr = {"Stanliukas Nr.1","Staliukai Nr.2","Staliukai Nr.3","Staliukai Nr.4","Staliukai Nr.5","Staliukai Nr.6","Staliukai Nr.7","Staliukai Nr.8","Staliukai Nr.9","Staliukai Nr.10"};
    private void panel1_Paint(object sender, PaintEventArgs e)
    {

    }
    Button[] staliukai = new Button[10];
    string dir = @"C:\Users\Roberto\Documents\Visual Studio 2013\Projects\WindowsFormsApplication6\WindowsFormsApplication6\Uzsakymai\";
    string flnm;
    string fldir;
    int StalID;
    string[] staliukas = { "StaliukasNr1.txt", "StaliukasNr2.txt", "StaliukasNr3.txt", "StaliukasNr4.txt", "StaliukasNr5.txt", "StaliukasNr6.txt", "StaliukasNr7.txt", "StaliukasNr8.txt", "StaliukasNr9.txt", "StaliukasNr10.txt" };
    private void Form1_Load(object sender, EventArgs e)
    {

            button1.Enabled = false;
            button2.Enabled = false;
            button3.Enabled = false;
            button4.Enabled = false;
            button5.Enabled = false;
            button6.Enabled = false;
            button7.Enabled = false;
            button8.Enabled = false;
            button9.Enabled = false;
            button10.Enabled = false;

        //Creating dynamical buttons 

         for (int i = 0; i < 10; i++)
          {
                  flnm = staliukas[i];
                      fldir = dir + flnm;
                  staliukai[i] = new Button();
                      staliukai[i].Text = stalnr[i];
                      staliukai[i].Height = 40;
                      staliukai[i].Width = 100;
                  staliukai[i].Location = new Point(20, 50 * i + 55);
                      staliukai[i].Parent = panel1;

        // First check if there is some files in folder 

             if (!File.Exists(fldir))
              {
                   staliukai[i].Enabled = false;
              }
              else
               {
                  staliukai[i].Enabled = true;
               }

                  staliukai[i].Click += staliukai_Click;
                  staliukai[i].Tag = i;


          }
               panel1.AutoScroll = true;

             }


        /*Watcher should check for changes in certain folder for file changes and new file creation and use the function to enable button*/


              private void fileSystemWatcher1_Changed(object sender, FileSystemEventArgs e)
             {
               timer1.Enabled = true;
               patikrinimas();
                 }
                 private void fileSystemWatcher1_Created(object sender, FileSystemEventArgs e)
                {
              timer1.Enabled = true;
                 patikrinimas();

                   }

            /*Function for checking if file exists*/

                 void patikrinimas()
                {
                   for (int i = 0; i < 10; i++)
                 {
                        Button temp = staliukai[i];
                       flnm = staliukas[i];
                          fldir = dir + flnm;
                       if (!File.Exists(fldir))
                         {
                          temp.Enabled = false;
                         }
                      else
                         {
                          temp.Enabled = true;
                             }

                         }

                         }

Answer 1

您可以修改这些代码，然后就可以了。

1.在Form1_Load中添加fileSystemWatcher1.Path。

this.fileSystemWatcher1.Path = this.dir;

2.设置 timer1.Start（）并将 patikrinimas（）从fileSystemWatcher1_Changed和fileSystemWatcher1_Created移至 timer1_Tick 。

private void fileSystemWatcher1_Changed(object sender, FileSystemEventArgs e)
{
    timer1.Enabled = true;
    timer1.Start();
    //patikrinimas();
}
private void fileSystemWatcher1_Created(object sender, FileSystemEventArgs e)
{
    timer1.Enabled = true;
    timer1.Start();
    //patikrinimas();
}

private void timer1_Tick(object sender, EventArgs e)
{
    patikrinimas();
}

再试一次。

启用和禁用动态按钮的功能（FileSystemWatcher）

1 个答案: