A simple file MD5 code automatic calculation comparator (with source code) _ Practical Skills

Mainly to multithreading update WinForm is not particularly clear, around to go around, make very dizzy, the main code is as follows, but also please you heroes a lot of guidance, thank you!

Copy Code code as follows:

Using System;
Using System.Collections.Generic;
Using System.ComponentModel;
Using System.Data;
Using System.Drawing;
Using System.Linq;
Using System.Text;
Using System.Windows.Forms;
Using System.Security.Cryptography;
Using System.IO;
Using System.Threading;

Namespace FileMD5 {
Public partial class Mainform:form {
Public MainForm () {
InitializeComponent ();
}

private void Button_file_click (object sender, EventArgs e) {
OpenFileDialog FileDialog = new OpenFileDialog ();
Filedialog.title = "Please select File";
Filedialog.restoredirectory = true;

if (filedialog.showdialog () = = DialogResult.OK) {
Textbox_file. Text = Filedialog.filename;
Textbox_result. Text = "";
FileInfo file = new FileInfo (filedialog.filename);
Fileszie = file. Length;
Showfilesize (Fileszie);
}

}

private void Button_exit_click (object sender, EventArgs e) {
This. Close ();
This. Dispose ();
}

private void Button_check_click (object sender, EventArgs e) {
Checkresult ();
}

MD5 MD5 = (MD5) cryptoconfig.createfromname ("MD5");
Long Fileszie = 0;

private void Button_calc_click (object sender, EventArgs e) {
string file = Textbox_file. Text;

if (file. Length = = 0) {
Textbox_result. Text = "Please select File First!";
Return
}

FileStream fs = null;
try {
FS = new FileStream (file, FileMode.Open, FileAccess.Read);
} catch (SystemException) {
Textbox_result. Text = "File open error, please select file again!";
Return
}

Enable multithreading for files larger than 100M
if (fs. Length > 100L * 1024 * 1024) {

String message = "The file has exceeded 100M, requiring a longer calculation time." \ nthe software will start a background thread for processing. Do you want to continue? ";
String caption = "Larger file";
MessageBoxButtons buttons = Messageboxbuttons.yesno;

if (MessageBox.Show (message, caption, buttons) = = System.Windows.Forms.DialogResult.No) {
Fs. Close ();
Textbox_result. Text = "File is large, not calculated." ";
Return
}
Textbox_result. Text = "In calculation, please wait ...";
Button_calc. Enabled = false;
Button_file. Enabled = false;

Thread thread = new Thread (new Parameterizedthreadstart (calcMD5));
Thread. Start (FS);

} else {
CalcMD5 (FS);
}
}

A function that establishes an object parameter is used to handle the problem of using parameters in the thread invocation.
private void CalcMD5 (Object fs) {
CalcMD5 ((FileStream) FS);
}

The delegate that the Invoke function needs to use
delegate void Updatewindows (byte[] result);

private void CalcMD5 (FileStream fs) {
byte[] Md5byte = Md5.computehash (FS);

if (this. invokerequired) {
This. Invoke (New Updatewindows (Showresult), md5byte);
} else {
Showresult (Md5byte);
}
Fs. Close ();
}

private void Showresult (byte[] md5byte) {
int I, J;
StringBuilder sb = new StringBuilder (32);
foreach (Byte b in Md5byte) {
i = Convert.ToInt32 (b);
j = i >> 4;
Sb. Append (Convert.ToString (J, 16));
j = ((I << 4) & 0X00FF) >> 4;
Sb. Append (Convert.ToString (J, 16));
}

String result = sb. ToString (). ToUpper ();

Textbox_result. Text = result;
Button_calc. Enabled = true;
Button_file. Enabled = true;
Checkresult ();

}

private void Checkresult () {

string result = Textbox_result. Text;

if (textbox_md5. Text.length = = 0) {
Textbox_compare. Text = "";
Textbox_compare. Visible = false;
Return
}

if (result. Length!= 32) {
Textbox_compare. Visible = true;
Textbox_compare. BackColor = Color.pink;
Textbox_compare. Text = "The calculation results box is not MD5 code, please do the calculation first!" ";
Return
}

if (textbox_md5. Text.trim (). ToUpper (). Equals (result. ToUpper ()) {
Textbox_compare. Visible = true;
Textbox_compare. BackColor = Color.lightgreen;
Textbox_compare. Text = "MD5 code has been matched, file has not been modified, can be assured of use!" ";
} else {
Textbox_compare. Visible = true;
Textbox_compare. BackColor = color.red;
Textbox_compare. Text = "MD5 code does not match, the file has been modified, please be careful!" ";
}
}

private void Showfilesize (long size) {

float d_size;
String unit = "Byte";

if (Size > 1024 * 1024 * 1024) {//greater than 1G display
D_size = size/(float) (1024 * 1024 * 1024);
Unit = "GB";
} else {
if (Size > 1024 * 1024) {//greater than 1M display
D_size = size/(float) (1024 * 1024);
Unit = "MB";
} else {
if (Size > 1024) {//greater than 1K display
D_size = size/(float) (1024);
Unit = "KB";
} else {
d_size = size;
}
}
}
Textbox_filesize. Text = string. Format ("{0:f} {1} ({2:n0} bytes)", D_size, Unit, size);
}
}
}

Complete VS2010 Project Download: Http://xiazai.jb51.net/201302/yuanma/FileMD5_jb51.net.rar