Programing Reference For .Net,Java,C

  For a long time before things out Liuliu recently, and has not been for the last application of things, a bit unfamiliar! I hope the things this can help you, we discussed the common progress of this article is relatively simple, you are for the landing of a common frame control! 

  First of all construction projects LoginControl a solution, add a class library project LoginControl, and then add a user control ctlLogin 

  Then write code in the document ctlLogin.cs 

  / / CtlLogin.cs 

  Using System; 
  Using System.Collections; 
  Using System.ComponentModel; 
  Using System.Drawing; 
  Using System.Data; 
  Using System.Windows.Forms; 
  Using System.Text; 

  Namespace LoginControl 
  ( 
  / / / 

  / / / CtlLogin explanatory memorandum. 
  / / / 

  Public class ctlLogin: System.Windows.Forms.UserControl 
  ( 
  Private System.Windows.Forms.Panel panel1; 
  Private System.Windows.Forms.Label lHeader; 
  Private System.Windows.Forms.Label lText; 
  Private System.Windows.Forms.Button btnLogin; 
  Private System.Windows.Forms.Label lPassword; 
  Private System.Windows.Forms.Label lUsername; 
  Private System.Windows.Forms.TextBox txtPassword; 
  Private System.Windows.Forms.TextBox txtUsername; 
  Private System.Windows.Forms.PictureBox pictureBox1; 
  Private System.Windows.Forms.ErrorProvider errorProvider; 
  / / / 

  / / / Necessary for the design variables. 
  / / / 

  Private System.ComponentModel.Container components = null; 

  Public event System.EventHandler Successful; 
  Public event System.EventHandler Failed; 

  Private ArrayList strUsername = new ArrayList (); 
  Private ArrayList strPassword = new ArrayList (); 
  Private int index =- 1; 

  Private string ErrMsg = "Please enter the correct user name and password!"; 

  Public ctlLogin () 
  ( 
  / / The call is Windows.Forms form designer necessary. 
  InitializeComponent (); 

  / / TODO: Add after InitializeComponent call any initialization 
  StrUsername.Clear (); 
  StrPassword.Clear (); 
  ) 

  / / / 

  / / / Cleaning is the use of all the resources. 
  / / / 

  Protected override void Dispose (bool disposing) 
  ( 
  If (disposing) 
  ( 
  If (components! = Null) 
  ( 
  Components.Dispose (); 
  ) 
  ) 
  Base.Dispose (disposing); 
  ) 

  # Region Component Design generates code 
  / / / 

  / / / Designer support of the approach - Do not use the code editor 
  / / / Modify the content of this method. 
  / / / 

  Private void InitializeComponent () 
  ( 
  System.Resources.ResourceManager resources = new System.Resources.ResourceManager (typeof (ctlLogin)); 
  This.panel1 = new System.Windows.Forms.Panel (); 
  This.pictureBox1 = new System.Windows.Forms.PictureBox (); 
  This.lText = new System.Windows.Forms.Label (); 
  This.lHeader = new System.Windows.Forms.Label (); 
  This.btnLogin = new System.Windows.Forms.Button (); 
  This.lPassword = new System.Windows.Forms.Label (); 
  This.lUsername = new System.Windows.Forms.Label (); 
  This.txtPassword = new System.Windows.Forms.TextBox (); 
  This.txtUsername = new System.Windows.Forms.TextBox (); 
  This.errorProvider = new System.Windows.Forms.ErrorProvider (); 
  This.panel1.SuspendLayout (); 
  This.SuspendLayout (); 
  / / 
  / / Panel1 
  / / 
  This.panel1.BackColor = System.Drawing.SystemColors.ActiveCaptionText; 
  This.panel1.Controls.Add (this.pictureBox1); 
  This.panel1.Controls.Add (this.lText); 
  This.panel1.Controls.Add (this.lHeader); 
  This.panel1.Location = new System.Drawing.Point (4, 4); 
  This.panel1.Name = "panel1"; 
  This.panel1.Size = new System.Drawing.Size (480, 52); 
  This.panel1.TabIndex = 0; 
  / / 
  / / PictureBox1 
  / / 
  This.pictureBox1.Image = ((System.Drawing.Image) (resources.GetObject ( "pictureBox1.Image "))); 
  This.pictureBox1.Location = new System.Drawing.Point (432, 12); 
  This.pictureBox1.Name = "pictureBox1"; 
  This.pictureBox1.Size = new System.Drawing.Size (40, 32); 
  This.pictureBox1.TabIndex = 6; 
  This.pictureBox1.TabStop = false; 
  / / 
  / / LText 
  / / 
  This.lText.Location = new System.Drawing.Point (36, 24); 
  This.lText.Name = "lText"; 
  This.lText.Size new System.Drawing.Size = (360, 20); 
  This.lText.TabIndex = 5; 
  This.lText.Text = "Please enter your user name and password."; 
  This.lText.TextAlign = System.Drawing.ContentAlignment.MiddleLeft; 
  / / 
  / / LHeader 
  / / 
  This.lHeader.Font = new System.Drawing.Font ( "Tahoma" 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte) (0))); 
  This.lHeader.Location = new System.Drawing.Point (12, 4); 
  This.lHeader.Name = "lHeader"; 
  This.lHeader.Size new System.Drawing.Size = (384, 20); 
  This.lHeader.TabIndex = 4; 
  This.lHeader.Text = "landing"; 
  This.lHeader.TextAlign = System.Drawing.ContentAlignment.MiddleLeft; 
  / / 
  / / BtnLogin 
  / / 
  This.btnLogin.FlatStyle = System.Windows.Forms.FlatStyle.Popup; 
  This.btnLogin.Font = new System.Drawing.Font ( "Tahoma" 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte) (0))); 
  This.btnLogin.Location = new System.Drawing.Point (376, 292); 
  This.btnLogin.Name = "btnLogin"; 
  This.btnLogin.Size = new System.Drawing.Size (70, 20); 
  This.btnLogin.TabIndex = 14; 
  This.btnLogin.Text = "landing"; 
  This.btnLogin.Click + = new System.EventHandler (this.btnLogin_Click); 
  / / 
  / / LPassword 
  / / 
  This.lPassword.Font = new System.Drawing.Font ( "Tahoma" 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte) (0))); 
  This.lPassword.Location = new System.Drawing.Point (76, 252); 
  This.lPassword.Name = "lPassword"; 
  This.lPassword.Size = new System.Drawing.Size (80, 20); 
  This.lPassword.TabIndex = 16; 
  This.lPassword.Text = "password"; 
  This.lPassword.TextAlign = System.Drawing.ContentAlignment.MiddleRight; 
  / / 
  / / LUsername 
  / / 
  This.lUsername.Font = new System.Drawing.Font ( "Tahoma" 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte) (0))); 
  This.lUsername.Location = new System.Drawing.Point (76, 212); 
  This.lUsername.Name = "lUsername"; 
  This.lUsername.Size = new System.Drawing.Size (80, 20); 
  This.lUsername.TabIndex = 15; 
  This.lUsername.Text = "user name"; 
  This.lUsername.TextAlign = System.Drawing.ContentAlignment.MiddleRight; 
  / / 
  / / TxtPassword 
  / / 
  This.txtPassword.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle; 
  This.txtPassword.Location = new System.Drawing.Point (176, 252); 
  This.txtPassword.Name = "txtPassword"; 
  This.txtPassword.PasswordChar = '*'; 
  This.txtPassword.Size new System.Drawing.Size = (270, 21); 
  This.txtPassword.TabIndex = 13; 
  This.txtPassword.Text = ""; 
  This.txtPassword.KeyPress + = new System.Windows.Forms.KeyPressEventHandler (this.txtPassword_KeyPress); 
  This.txtPassword.Leave + = new System.EventHandler (this.Control_Leave); 
  This.txtPassword.Enter + = new System.EventHandler (this.Control_Enter); 
  / / 
  / / TxtUsername 
  / / 
  This.txtUsername.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle; 
  This.txtUsername.Location = new System.Drawing.Point (176, 212); 
  This.txtUsername.Name = "txtUsername"; 
  This.txtUsername.Size new System.Drawing.Size = (270, 21); 
  This.txtUsername.TabIndex = 12; 
  This.txtUsername.Text = ""; 
  This.txtUsername.KeyPress + = new System.Windows.Forms.KeyPressEventHandler (this.txtUsername_KeyPress); 
  This.txtUsername.Leave + = new System.EventHandler (this.Control_Leave); 
  This.txtUsername.Enter + = new System.EventHandler (this.Control_Enter); 
  / / 
  / / ErrorProvider 
  / / 
  This.errorProvider.ContainerControl = this; 
  / / 
  / / CtlLogin 
  / / 
  This.Controls.Add (this.btnLogin); 
  This.Controls.Add (this.lPassword); 
  This.Controls.Add (this.lUsername); 
  This.Controls.Add (this.txtPassword); 
  This.Controls.Add (this.txtUsername); 
  This.Controls.Add (this.panel1); 
  This.Name = "ctlLogin"; 
  This.Size = new System.Drawing.Size (484, 348); 
  This.Load + = new System.EventHandler (this.ctlLogin_Load); 
  This.panel1.ResumeLayout (false); 
  This.ResumeLayout (false); 

  ) 
  # Endregion 

  Private void ctlLogin_Load (object sender, System.EventArgs e) 
  ( 
  / / StrUsername.Add (txtUsername.Text.Trim ()); 
  / / StrPassword.Add (txtPassword.Text.Trim ()); 
  ) 

  Private void txtPassword_KeyPress (object sender, System.Windows.Forms.KeyPressEventArgs e) 
  ( 
  If (e.KeyChar == (char) 13) 
  ( 
  BtnLogin_Click (sender, new EventArgs ()); 
  ) 
  ) 

  Private void btnLogin_Click (object sender, System.EventArgs e) 
  ( 
  Bool b = CheckPassword (Username, Password); 
  If (b) 
  ( 
  Successful (this, new System.EventArgs ()); 
  ) 
  Else 
  ( 
  Failed (this, new System.EventArgs ()); 
  ) 
  ) 

  / / / 

  / / / Judgement user name and password are correct 
  / / / 

  / / / 

  All users    / / / 

  All user passwords    / / / 
  Private bool CheckPassword (ArrayList alUser, ArrayList alPWD) 
  ( 
  String strUser = ""; 
  String strPWD = ""; 
  If (alUser.Count> 0 & & alPWD.Count> 0) 
  ( 
  For (int i = 0; i    ( 
  StrUser [i] = alUser. ToString (); 
  StrPWD [i] = alPWD. ToString (). Trim (); 
  If (strUser.Trim () == txtUsername.Text.Trim () & & strPWD.Trim () == txtPassword.Text.Trim ()) 
  ( 
  Index_Username = i; 
  ErrorProvider.Dispose (); 
  Return true; 
  ) 
  If (i == alUser.Count-1) 
  ( 
  ErrorProvider.SetError (btnLogin, ErrMsg); 
  Return false; 
  ) 
  ) 
  ) 
  Return false; 
  ) 

  Private void Control_Enter (object sender, System.EventArgs e) 
  ( 
  Control ctl = (Control) sender; 
  Ctl.BackColor = Color.LemonChiffon; 
  ) 

  Private void Control_Leave (object sender, System.EventArgs e) 
  ( 
  Control ctl = (Control) sender; 
  Ctl.BackColor = Color.White; 
  ) 

  Private void txtUsername_KeyPress (object sender, System.Windows.Forms.KeyPressEventArgs e) 
  ( 
  If (e.KeyChar == (char) 13) 
  ( 
  TxtPassword.Focus (); 
  ) 
  ) 

  / / / 

  / / / All users 
  / / / 

  Public ArrayList Username 
  ( 
  Get 
  ( 
  Return strUsername; 
  ) 
  Set 
  ( 
  StrUsername = value; 
  ) 

  ) 

  / / / 

  / / / Passwords for all users 
  / / / 

  Public ArrayList Password 
  ( 
  Get 
  ( 
  Return strPassword; 
  ) 
  Set 
  ( 
  StrPassword = value; 
  ) 
  ) 

  / / / 

  / / / User in the array Username Index 
  / / / 

  Public int Index_Username 
  ( 
  Get 
  ( 
  Return index; 
  ) 
  Set 
  ( 
  Index = value; 
  ) 
  ) 

  / / / 

  / / / Error message 
  / / / 

  Public string ErrorMessage 
  ( 
  Get 
  ( 
  Return ErrMsg; 
  ) 
  Set 
  ( 
  ErrMsg = value; 
  ) 
  ) 
  ) 
  ) 

  Then, you can compile into LoginControl.dll 

  Then add in resolving the project a test project Test, and then in the toolbox in Add / Remove item compiled LoginControl.dll just add, add a test for frmTest interface, and then in the toolbox controls until frmTest page ctlLogin in the face 

  Then frmTest.cs to test earlier in the controls 

  / / FrmTest.cs 

  Using System; 
  Using System.Drawing; 
  Using System.Collections; 
  Using System.ComponentModel; 
  Using System.Windows.Forms; 
  Using System.Data; 
  Using InformationClass; / / to write a test-class 

  Namespace Test 
  ( 
  / / / 

  / / / Summary of the Form1. 
  / / / 

  Public class frmTest: System.Windows.Forms.Form 
  ( 
  Private LoginControl.ctlLogin ctlLogin; 
  / / / 

  / / / Necessary for the design variables. 
  / / / 

  Private System.ComponentModel.Container components = null; 

  Private Users objUsers = new Users (); / / examples of user-defined collections landing 
  Private User m_objUser = new User () / / examples of user-defined categories landing 

  Public frmTest () 
  ( 
  / / 
  / / Windows Forms designer support necessary 
  / / 
  InitializeComponent (); 

  / / 
  / / TODO: Add after InitializeComponent call any constructor code 
  / / 
  ) 

  / / / 

  / / / Cleaning is the use of all the resources. 
  / / / 

  Protected override void Dispose (bool disposing) 
  ( 
  If (disposing) 
  ( 
  If (components! = Null) 
  ( 
  Components.Dispose (); 
  ) 
  ) 
  Base.Dispose (disposing); 
  ) 

  # Region Windows Forms designer generated code 
  / / / 

  / / / Designer support of the approach - Do not use the code editor Laws 
  / / / The contents of this method. 
  / / / 

  Private void InitializeComponent () 
  ( 
  System.Resources.ResourceManager resources = new System.Resources.ResourceManager (typeof (frmTest)); 
  This.ctlLogin = new LoginControl.ctlLogin (); 
  This.SuspendLayout (); 
  / / 
  / / CtlLogin 
  / / 
  This.ctlLogin.ErrorMessage = "Please enter the correct user name and password!"; 
  This.ctlLogin.Index_Username = -1; 
  This.ctlLogin.Location new System.Drawing.Point = (0, 0); 
  This.ctlLogin.Name = "ctlLogin"; 
  This.ctlLogin.Size = new System.Drawing.Size (484, 348); 
  This.ctlLogin.TabIndex = 0; 
  This.ctlLogin.Failed + = new System.EventHandler (this.ctlLogin_Failed); 
  This.ctlLogin.Load + = new System.EventHandler (this.Form1_Load); 
  This.ctlLogin.Successful + = new System.EventHandler (this.ctlLogin_Successful); 
  / / 
  / / FrmTest 
  / / 
  This.AutoScaleBaseSize = new System.Drawing.Size (6, 14); 
  This.ClientSize = new System.Drawing.Size (484, 345); 
  This.Controls.Add (this.ctlLogin); 
  This.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle; 
  This.Icon = ((System.Drawing.Icon) (resources.GetObject ( "$ this.Icon "))); 
  This.MaximizeBox = false; 
  This.MinimizeBox = false; 
  This.Name = "frmTest"; 
  This.Text = "landing system"; 
  This.Load + = new System.EventHandler (this.Form1_Load); 
  This.ResumeLayout (false); 

  ) 
  # Endregion 

  / / / 

  / / / Application's main entrance point. 
  / / / 

[STAThread]
  Static void Main () 
  ( 
  Application.Run (new frmTest ()); 
  ) 

  Private void ctlLogin_Failed (object sender, System.EventArgs e) 
  ( 
  MessageBox.Show ( "landing failed! Please enter the correct user name and password information !!"," tips," MessageBoxButtons.OK, MessageBoxIcon.Error); 
  ) 

  Private void ctlLogin_Successful (object sender, System.EventArgs e) 
  ( 
  ObjUsers m_objUser = [ctlLogin.Index_Username]; 
  MessageBox.Show ( "successful landing!", "Information Tip" MessageBoxButtons.OK, MessageBoxIcon.Information); 
  ) 

  Private void Form1_Load (object sender, System.EventArgs e) 
  ( 
  ObjUsers = new ReadData (). GetUsers (); 
  If (objUsers.Count> 0) 
  ( 
  Foreach (User objUser in objUsers) 
  ( 
  CtlLogin.Username.Add (objUser.Name); 
  CtlLogin.Password.Add (objUser.Password); 
  ) 
  ) 
  ) 
  ) 
  ) 

  Operational procedures 

  If the landing there will be failure 

  If successful landing 

  In this way, a little on the controls for the landing, I hope that the article can learn not just for how long. NET programmers help if there are any deficiencies in and hope you will correct me, thank you 

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