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通过事件机制，增加了计算MD5过程提示。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO; namespace WindowsFormsApplication13 { public partial class Form1 : Form { public delegate void delegateMD( object sender, EventArgs e); public event delegateMD openfileEvent; public event delegateMD finishEvent; public Form1() { InitializeComponent(); } private void Form1_Load( object sender, EventArgs e) { } private async void button1_Click( object sender, EventArgs e) { openfileEvent += ( object obj, EventArgs e1) => { label1.Text = "正在计算MD5值，请稍等。。。" ; }; finishEvent += ( object obj, EventArgs e1) => { label1.Text = "" ; }; using (OpenFileDialog dialog = new OpenFileDialog()) { if (dialog.ShowDialog() == DialogResult.OK) { openfileEvent( this , e); String fileName = dialog.FileName; this .textBox1.Text = "" ; //this.txtSH1.Text = ""; // this .textBox1.Text = await getMD5HashAsync(fileName); //this.txtSH1.Text = GetMD5Hash(fileName); finishEvent( this , e); } } } //计算文件的MD5码 private Task< string > getMD5HashAsync( string pathName) { return Task.Run< string >( () => { string strResult = "" ; string strHashData = "" ; byte [] arrbytHashValue; System.IO.FileStream oFileStream = null ; System.Security.Cryptography.MD5CryptoServiceProvider oMD5Hasher = new System.Security.Cryptography.MD5CryptoServiceProvider(); try { oFileStream = new FileStream(pathName, FileMode.Open, FileAccess.Read,FileShare.ReadWrite); arrbytHashValue = oMD5Hasher.ComputeHash(oFileStream); //计算指定Stream 对象的哈希值 oFileStream.Close(); //由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如“F-2C-4A” strHashData = BitConverter.ToString(arrbytHashValue); //替换- strHashData = strHashData.Replace( "-" , "" ); strResult = strHashData; } catch (System.Exception ex) { MessageBox.Show(ex.Message); } return strResult; }); } } } |
异步执行代码：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO; namespace WindowsFormsApplication13 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load( object sender, EventArgs e) { } private async void button1_Click( object sender, EventArgs e) { using (OpenFileDialog dialog = new OpenFileDialog()) { if (dialog.ShowDialog() == DialogResult.OK) { String fileName = dialog.FileName; this .textBox1.Text = "" ; //this.txtSH1.Text = ""; // this .textBox1.Text = await getMD5HashAsync(fileName); //this.txtSH1.Text = GetMD5Hash(fileName); } } } //计算文件的MD5码 private Task< string > getMD5HashAsync( string pathName) { return Task.Run< string >( () => { string strResult = "" ; string strHashData = "" ; byte [] arrbytHashValue; System.IO.FileStream oFileStream = null ; System.Security.Cryptography.MD5CryptoServiceProvider oMD5Hasher = new System.Security.Cryptography.MD5CryptoServiceProvider(); try { oFileStream = new FileStream(pathName, FileMode.Open, FileAccess.Read,FileShare.ReadWrite); arrbytHashValue = oMD5Hasher.ComputeHash(oFileStream); //计算指定Stream 对象的哈希值 oFileStream.Close(); //由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如“F-2C-4A” strHashData = BitConverter.ToString(arrbytHashValue); //替换- strHashData = strHashData.Replace( "-" , "" ); strResult = strHashData; } catch (System.Exception ex) { MessageBox.Show(ex.Message); } return strResult; }); } } } |
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