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This article is about the benefits of using the System.IO class for VB.NET file processing. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

VB.NET file processing is an indispensable task in software development. I encountered many twists and turns in the course of my study. But now with VB.NET, it greatly simplifies the difficulty of development and learning, so that beginners can master file-related programming skills in a very short time. Know System.IO in .net file-related classes are concentrated in the System.IO class, in which we can see a lot of class names that start with "File". Let's introduce a few commonly used classes, which are:

◆ Directory: static methods for creating, moving, and enumerating directories and subdirectories.

◆ File: static methods for creating, copying, deleting, moving, and opening files, and assisting in the creation of FileStream objects.

◆ FileInfo: provides instance methods for creating, copying, deleting, moving, and opening files, and helps create FileStream objects.

◆ FileStream: work with the Stream object to complete more file operations. We will introduce it in the next section.

◆ Path: specifies the directory path information for the file.

VB.NET file processing * tasks

In the following program snippet, we will use the above-mentioned classes and the most commonly used "File Open" dialog window to complete a file-based programming. Program function: move files to the Recycle Bin folder and run these programs from the Recycle Bin.

Many readers may ask, why take this code as an example? There are three reasons:

1. This code fits the content of this section.

two。 Many virus programs were placed in the Recycle Bin at the beginning of Windows's release, and these technologies are sure to increase readers' interest in learning this article.

3. This procedure still has certain practicability.

If you have an important file, you can Copy it to the Recycle Bin. Who would have thought of saving files in the recycling bin? And for the average user, they will not know that the Recycle Bin can save and run the file, because double-clicking the file in the Recycle Bin will not run, only its file properties will be displayed. Even if you open the Recycle Bin, you can only see the files to be deleted, but not the files we specially saved to the Recycle Bin. Add controls and set related properties: three Button, one LISTBOX, and one OPENFILEDIALOG control.

The VB.NET file processing code is as follows

Double-click Button1 to add the following code with detailed comments in the code:

Private Sub Button1_Click?ByVal sender As System.Object? ByVal e As System.EventArgs Handles Button1.Click OpenFileDialog1.ShowDialog? 'Show file opening dialog Dim fname As New FileInfo?OpenFil eDialog1.FileName' initialize the FILEINFO class, which can get all kinds of information about the file, which is used in this code to get the file name Dim copyf As System.IO.File 'initialization FILE class, which is used to perform specific operations on the file. This code is used to transfer files sname = fname.Name? 'use the name property of the fileinfo class to get the file name, but does not include the path copyf.Move?OpenFileDialog1.FileName? "c?\ recycled\" & sname' to move to the Recycle Bin folder, where RECYCLED is the Recycle Bin folder End Sub

Double-click Button2 to add the following code with detailed comments in the code:

Private Sub Button2_Click?ByVal sender As Object? ByVal e As System.EventArgs Handles Button2.Click Dim zh Dim pj As String 'Select the file to run in the listbox control zh = ListBox1.SelectedIndex' record the selected serial number pj = ListBox1.Items.Item?zh' with pj record the text corresponding to the serial number, and the corresponding text in this code indicates the file name Me.Text = "running program" + pj 'indicates the running program at the title bar of the window These programs are listed in listbox, that is, the file Dim spros As New System.Diagnostics.Process? 'Process in the Recycle Bin is a process class, which is similar to the shell function in Visual Basic6.0 in Visual Basic. Net. We will discuss it specifically in later articles. Spros.Start?pj 'runs the selected file End Sub using the start property in the Process class

Double-click to add the following code to Button3 with detailed comments in the code:

Private Sub Button3_Click?ByVal sender As Object? ByVal e As System.EventArgs Handles Button3.Click Dim dir As System.IO.Directory because the directory object can directly operate on the directory, so use it here to get the number of recycled files Dim i As Integer Dim filename? Fileno ListBox1.Items.Clear? 'clear listbox to prepare for the next display filename = dir.GetFiles? "c?\ recycled"? ""? "' use the Getfile property of the Directory class to get the array of files fileno = dir.GetFiles?" c?\ recycled "?"? ".Length 'uses Length to get the size of the array, that is, how many files are in the Recycle Bin For I = 0 To fileno-1 ListBox1.Items.Add?filename?i' to add each file to listbox Show the specific file Next End Sub in the Recycle Bin

Program description: if you want to run a file, please select a file first, and then click the "start File from the Recycle Bin" button. In the display of the Recycle Bin files, you will see some strange file names, these files are the files you deleted, but Microsoft has changed the original names of these files. So you don't have to worry about these files, but these files can still be set up and run in this program, the same as the files you save in the Recycle Bin except for their names. Note that when you open the Recycle Bin in my computer and Explorer and select empty Recycle Bin, all files in the Recycle Bin will be deleted.

Thank you for reading! This is the end of this article on "what are the benefits of using the System.IO class for VB.NET file processing". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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