如何在30秒后删除文件？

Question

我正在处理一个C＃项目，我需要在30秒后删除文件。所以一旦文件发送到机器我需要软件计数到30秒，并且让我们说.. 显示飞溅形式然后删除该文件。请帮助我。

所以在我的情况下，我正在将文件复制到bin/debug文件夹。 30秒后，我需要删除的文件..

这是我的代码：

private void button4_Click(object sender, EventArgs e) 
    { 
     //string filePath = image_print(); 
     // MessageBox.Show(filePath, "path"); 
     string s = image_print() + Print_image(); 
     if (String.IsNullOrEmpty(s) || img_path.Text == "") 
     { 
      return; 
     } 
     else 
     { 
      PrintFactory.sendTextToLPT1(s); 
      //after this the i need the another form to pop up.. lets say i have a spalsh screen.. and it should show for 30 seconds then i need to delete the file.. where i have codes bwlow 

      string Filename = img_path.Text; 

      if (string.IsNullOrEmpty(Filename)) 
      return; 

      if (Filename.ToCharArray().Intersect(Path.GetInvalidFileNameChars()).Any()) 
      return; 

      File.Delete(Path.Combine(@"\\bin\Debug", Filename)); 
     } 
    } 

    private string image_print() 
    { 
     OpenFileDialog ofd = new OpenFileDialog(); 
     string path = ""; 
     string full_path = ""; 
     string filename_noext = ""; 
     ofd.InitialDirectory = @"C:\ZTOOLS\FONTS"; 
     ofd.Filter = "GRF files (*.grf)|*.grf"; 
     ofd.FilterIndex = 2; 
     ofd.RestoreDirectory = true; 
     if (ofd.ShowDialog() == DialogResult.OK) 
     { 
      filename_noext = System.IO.Path.GetFileName(ofd.FileName); 
      path = Path.GetFullPath(ofd.FileName); 
      img_path.Text = filename_noext; 
      //MessageBox.Show(filename_noext, "Filename"); - - -> switching.grf 
      // MessageBox.Show(full_path, "path"); 
      //move file from location to debug 
      string replacepath = @"\\bin\Debug"; 
      string fileName = System.IO.Path.GetFileName(path); 
      string newpath = System.IO.Path.Combine(replacepath, fileName); 
      // string newpath = string.Empty; 
      if (!System.IO.File.Exists(filename_noext)) 
       System.IO.File.Copy(path, newpath); 
      filename_noext = img_path.Text; 
     MessageBox.Show(filename_noext, "path"); 
     } 

     if (string.IsNullOrEmpty(img_path.Text)) 
      return "";// 

     StreamReader test2 = new StreamReader(img_path.Text); 
     string s = test2.ReadToEnd(); 
     return s; 
    } 


    private string Print_image() 
    { 
     //some codes 
      return s; 
    } 

Answer 1

创建一个新的形式，用它作为SplashScreen。

在闪屏的构造，以文件路径作为参数，并启动定时器：

string filePath; 

public SplashScreen(string FileToDeletePath) 
{ 
    InitializeComponent(); 

    this.filePath = FileToDeletePath; 

    System.Windows.Forms.Timer timer1 = new System.Windows.Forms.Timer(); 
    timer1.Interval = 3000; 
    timer1.Tick += timer1_Tick; 
    timer1.Start(); 
} 

void timer1_Tick(object sender, EventArgs e) 
{ 
    //delete file 
    if (!string.IsNullOrEmpty(filePath)) 
     File.Delete(filePath); 

    //dispose form after deleting the file 
    this.Close(); 
} 

如何使用SplashScreen：

else 
{ 
    PrintFactory.sendTextToLPT1(s); 
    //after this the i need the another form to pop up.. lets say i have a spalsh screen.. and it should show for 30 seconds then i need to delete the file.. where i have codes bwlow 

    string Filename = img_path.Text; 

    if (string.IsNullOrEmpty(Filename)) 
     return; 

    if (Filename.ToCharArray().Intersect(Path.GetInvalidFileNameChars()).Any()) 
     return; 

    File.Delete(Path.Combine(@"\\bin\Debug", Filename)); //remove this line, it'll be done in SplashScreen 

    string filePath = Path.Combine(@"\\bin\Debug", Filename); //create path of file to be removed 

    //SplashScreen 
    SplashScreen splash = new SplashScreen(filePath); 
    splash.Show(); 
} 

的SplashScreen实例将自动设置删除该文件后，它不会阻止你的主线程（UI）。