Landing Box control

Control a long time ago to do things, recently took out to sneak, recently has not been the application of things, a little rusty! I hope this article can help you, we jointly explore common progress, this article is relatively simple! is to make a universal landing box control!

First build a solution project Logincontrol, add a project Logincontrol for a class library, and then add a user control Ctllogin



Then write the code in the CtlLogin.cs file

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
{
///
Summary description of the ctllogin.
///
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;
///
The required designer variable.
///
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 username and password!";

Public Ctllogin ()
{
This call is required for the Windows.Forms form designer.
InitializeComponent ();

TODO: Add any initialization after the InitializeComponent call
Strusername.clear ();
Strpassword.clear ();
}

///
Clean up all resources that are in use.
///
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}

Code generated #region Component Designer
///
Designer supports the desired method-do not use the Code Editor
Modify the contents 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 username 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 ());
}
}

///
Determine if the 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=aluser[i]. ToString ();
Strpwd=alpwd[i]. 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;
}

}


///
All user passwords
///
Public ArrayList Password
{
Get
{
return strpassword;
}
Set
{
strpassword = value;
}
}

///
The index in the user array username
///
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 it into a LoginControl.dll

Add a test project to the solution and add/Remove items in the toolbox to add the LoginControl.dll you just compiled, add a test interface to frmtest, and then drag the Ctllogin control to the Frmtest page in the Toolbox

Then test the control in the FrmTest.cs

FrmTest.cs

Using System;
Using System.Drawing;
Using System.Collections;
Using System.ComponentModel;
Using System.Windows.Forms;
Using System.Data;
Using Informationclass; A test class written by yourself

Namespace Test
{
///
Summary description of the Form1.
///
public class FrmTest:System.Windows.Forms.Form
{
Private Logincontrol.ctllogin Ctllogin;
///
The required designer variable.
///
Private System.ComponentModel.Container components = null;

Private users objusers=new users (); Instantiate a custom login user collection Class
Private user M_objuser=new user (); Instantiate a custom login user class

Public Frmtest ()
{
//
Required for Windows Forms Designer support
//
InitializeComponent ();

//
TODO: Add any constructor code after the InitializeComponent call
//
}

///
Clean up all resources that are in use.
///
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}

Code generated #region the Windows forms Designer
///
Designer supports required methods-do not use the Code editor to modify
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 username 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 = "System login";
This. Load + = new System.EventHandler (this. Form1_Load);
This. ResumeLayout (FALSE);

}
#endregion

///
The main entry point for the application.
///
[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 username and password!! "," Information tips, messageboxbuttons.ok,messageboxicon.error);
}

private void Ctllogin_successful (object sender, System.EventArgs e)
{
M_objuser=objusers[ctllogin.index_username];
MessageBox.Show ("Landing success!", "Information Tips", 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);
}
}
}
}
}



Running programs

If the landing fails, it will appear.





If the landing is successful





In this way, a small landing control is done well, I hope this article can be for just learning for a long time. NET programmer helps
If there is any shortage of places, I hope you can correct me, thank you