How to use C WinForm to copy files and display progress

How do you use it? C# Winform Copy files to show progress

Today, I'd like to share with you how to use C# Winform Realize the relevant knowledge points of copying files and displaying progress , Detailed content , Clear logic , I believe most people still know too much about this knowledge , So share this article for your reference , I hope you will gain something after reading this article , Now let's take a look .

Copying files shows the progress, which is actually the file flow to copy files , And after each piece of file is copied , Use the progress bar to display the copy .

One 、 In this example, we mainly use threads and delegates , In the use of Filestream Class while copying files , Use ProgressBar To display the file copy progress , The key technologies used in this example are explained below .

（1） Thread Constructor

This constructor mainly initializes Thread class . The syntax is as follows ：

public Thread(ThreadStart start);

Parameter description ：

start：ThreadStart entrust , It represents the method to be called when the thread starts execution .

（2） entrust

Executes the specified delegate on the thread that owns the underlying window handle for this control . The syntax is as follows ：

public object Invoke(Delegate method);

Parameter description ：

1method： Delegate containing the method to be called in the thread context of the control .
2 Return value ： The return value of the delegate being invoked , Or if the delegate does not return a value , Null reference .

Two 、 The following is the design process of the program

（1） stay VS Create a new form application in , And named it FileCopyPlan.

（2） Change the default form Form1 Of Name The attribute is Frm_Main, Add a to the form OpenFileDialog Control is used to select the source file , Add one FolderBrowserDialog Control , Used to select the file save path , Add two TextBox Control , It is used to display the path of source file and destination file respectively , add to 3 individual Button Control , Used to select the path of source file and destination file respectively , And realize the path function of files ; Add one ProgressBar Control is used to display the progress bar .

（3） The background code and comments of the program are as follows ：

public partial class Frm_Main : Form    {        public Frm_Main()        {            InitializeComponent();        }        private System.Threading.Thread thdAddFile; // Create a thread         private string str = "";        FileStream FormerOpen;// Instantiation FileStream class         FileStream ToFileOpen;// Instantiation FileStream class         private void button1_Click(object sender, EventArgs e)        {            if (openFileDialog1.ShowDialog() == DialogResult.OK)// Open the file dialog                 textBox1.Text = openFileDialog1.FileName;// Get the path to the source file         }        private void button2_Click(object sender, EventArgs e)        {            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)// Open the folders dialog box                 textBox2.Text = folderBrowserDialog1.SelectedPath;// Get the path to the destination file         }        private void button3_Click(object sender, EventArgs e)        {            if (textBox1.Text.Length == 0 || textBox2.Text.Length == 0)            {                MessageBox.Show(" Please select the original file path or destination file path .");                return;            }            str = textBox1.Text;// Record the path to the source file             str = "\\" + str.Substring(str.LastIndexOf('\\') + 1, str.Length - str.LastIndexOf('\\') - 1);// Get the name of the source file             thdAddFile = new Thread(new ThreadStart(SetAddFile));// Create a thread             thdAddFile.Start();// Execute the current thread         }        public delegate void AddFile();// Define the entrusted         /// <summary>        ///  Execute the delegate on the thread         /// </summary>        public void SetAddFile()        {            this.Invoke(new AddFile(RunAddFile));// Execute the specified delegate on the thread         }        /// <summary>        ///  Copy the file , And close the thread after the copy is complete         /// </summary>        public void RunAddFile()        {            CopyFile(textBox1.Text, textBox2.Text + str, 1024, progressBar1);// Copy file             thdAddFile.Abort();// Close thread         }        /// <summary>        ///  Copy of documents         /// </summary>        /// <param FormerFile="string"> Source file path </param>        /// <param toFile="string"> Destination file path </param>         /// <param SectSize="int"> Transfer size </param>         /// <param progressBar="ProgressBar">ProgressBar Control </param>         public void CopyFile(string FormerFile, string toFile, int SectSize, ProgressBar progressBar1)        {            progressBar1.Value = 0;// Set the current position of the progress bar to 0            progressBar1.Minimum = 0;// Set the minimum value of the progress bar to 0            FileStream fileToCreate = new FileStream(toFile, FileMode.Create);// Create destination file , If it already exists, it will be overwritten             fileToCreate.Close();// Close all resources             fileToCreate.Dispose();// Release all resources             FormerOpen = new FileStream(FormerFile, FileMode.Open, FileAccess.Read);// Open the source file as read-only             ToFileOpen = new FileStream(toFile, FileMode.Append, FileAccess.Write);// Open the destination file in writing             int max = Convert.ToInt32(Math.Ceiling((double)FormerOpen.Length / (double)SectSize));// According to the size of a transmission , Calculate the number of transfers             progressBar1.Maximum = max;// Set the maximum value of the progress bar             int FileSize;// The size of the file to be copied             if (SectSize < FormerOpen.Length)// If segmented copy , That is, the content of each copy is less than the total length of the file             {                byte[] buffer = new byte[SectSize];// According to the size of the transmission , Define an array of bytes                 int copied = 0;// Record the size of the transfer                 int tem_n = 1;// Set the number of progress blocks in the progress bar                 while (copied <= ((int)FormerOpen.Length - SectSize))// Copy body part                 {                    FileSize = FormerOpen.Read(buffer, 0, SectSize);// from 0 Start reading , Maximum reading per time SectSize                    FormerOpen.Flush();// Empty cache                     ToFileOpen.Write(buffer, 0, SectSize);// Write bytes to the destination file                     ToFileOpen.Flush();// Empty cache                     ToFileOpen.Position = FormerOpen.Position;// Make the location of source file and destination file stream the same                     copied += FileSize;// Record the copied size                     progressBar1.Value = progressBar1.Value + tem_n;// Add the progress block of the progress bar                 }                int left = (int)FormerOpen.Length - copied;// Get remaining size                 FileSize = FormerOpen.Read(buffer, 0, left);// Read the remaining bytes                 FormerOpen.Flush();// Empty cache                 ToFileOpen.Write(buffer, 0, left);// Write the rest                 ToFileOpen.Flush();// Empty cache             }            else// If the whole copy , That is, the content of each copy is greater than the total length of the file             {                byte[] buffer = new byte[FormerOpen.Length];// Get file size                 FormerOpen.Read(buffer, 0, (int)FormerOpen.Length);// Read the bytes of the source file                 FormerOpen.Flush();// Empty cache                 ToFileOpen.Write(buffer, 0, (int)FormerOpen.Length);// Write and put bytes                 ToFileOpen.Flush();// Empty cache             }            FormerOpen.Close();// Release all resources             ToFileOpen.Close();// Release all resources             if (MessageBox.Show(" Copy complete ") == DialogResult.OK)// Show " Copy complete " Prompt dialog             {                progressBar1.Value = 0;// Set the current position of the progress bar to 0                textBox1.Clear();// Empty text                 textBox2.Clear();                str = "";            }        }    }

（4） The running results of the program are shown in the figure ：

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