本文来源于网页设计爱好者web开发社区http://www.html.org.cn收集整理，欢迎访问。好久以前作的东西,最近拿出来溜溜,最近一直没有作应用程序方面的东西了,有点生疏! 希望我的这篇东西能对您有所帮助,大家共同探讨共同进步,此文章比较简单!是作一个通用的登陆框控件!
首先建一解决项目logincontrol,添加一个类库的项目logincontrol,然后添加用户控件ctllogin
然后在ctllogin.cs文件中写代码
//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 的摘要说明。
///
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;
///
/// 必需的设计器变量。
///
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 = "请输入正确的用户名和密码!";
public ctllogin()
{
// 该调用是 windows.forms 窗体设计器所必需的。
initializecomponent();
// todo: 在 initializecomponent 调用后添加任何初始化
strusername.clear();
strpassword.clear();
}
///
/// 清理所有正在使用的资源。
///
protected override void dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.dispose();
}
}
base.dispose( disposing );
}
#region 组件设计器生成的代码
///
/// 设计器支持所需的方法 - 不要使用代码编辑器
/// 修改此方法的内容。
///
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 = "请输入您的用户名和密码.";
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 = "登陆";
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 = "登 陆";
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 = "密 码";
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 = "用户名";
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());
}
}
///
/// 判断用户名和密码是否正确
///
/// 所有用户
/// 所有用户密码
///
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();
}
}
///
/// 所有用户
///
public arraylist username
{
get
{
return strusername;
}
set
{
strusername = value;
}
}
///
/// 所有用户密码
///
public arraylist password
{
get
{
return strpassword;
}
set
{
strpassword = value;
}
}
///
/// 在用户数组username中的索引
///
public int index_username
{
get
{
return index;
}
set
{
index=value;
}
}
///
/// 错误信息
///
public string errormessage
{
get
{
return errmsg;
}
set
{
errmsg = value;
}
}
}
}
接着,您就可以编译成logincontrol.dll
再在解决项目中添加一个测试项目test,然后在工具箱中添加/移除项中添加刚才编译的logincontrol.dll,添加一测试界面为frmtest,然后在工具箱中把ctllogin控件拖到frmtest页面中
然后在frmtest.cs中来测试刚才的控件
//frmtest.cs
using system;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.data;
using informationclass; //自己写的一个测试类
namespace test
{
///
/// form1 的摘要说明。
///
public class frmtest : system.windows.forms.form
{
private logincontrol.ctllogin ctllogin;
///
/// 必需的设计器变量。
///
private system.componentmodel.container components = null;
private users objusers=new users(); //实例化自定义的登陆用户集合类
private user m_objuser=new user(); //实例化自定义的登陆用户类
public frmtest()
{
//
// windows 窗体设计器支持所必需的
//
initializecomponent();
//
// todo: 在 initializecomponent 调用后添加任何构造函数代码
//
}
///
/// 清理所有正在使用的资源。
///
protected override void dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.dispose();
}
}
base.dispose( disposing );
}
#region windows 窗体设计器生成的代码
///
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void initializecomponent()
{
system.resources.resourcemanager resources = new system.resources.resourcemanager(typeof(frmtest));
this.ctllogin = new logincontrol.ctllogin();
this.suspendlayout();
//
// ctllogin
//
this.ctllogin.errormessage = "请输入正确的用户名和密码!";
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 = "系统登陆";
this.load += new system.eventhandler(this.form1_load);
this.resumelayout(false);
}
#endregion
///
/// 应用程序的主入口点。
///
[stathread]
static void main()
{
application.run(new frmtest());
}
private void ctllogin_failed(object sender, system.eventargs e)
{
messagebox.show("登陆失败！请输入正确的用户名和密码！!","信息提示",messageboxbuttons.ok,messageboxicon.error);
}
private void ctllogin_successful(object sender, system.eventargs e)
{
m_objuser=objusers[ctllogin.index_username];
messagebox.show("登陆成功!","信息提示",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);
}
}
}
}
}
运行程序
如果登陆失败就会出现
如果登陆成功
就这样,小小的一个登陆控件就作好了,希望我的这篇文章能对于刚学没有多久的.net程序员有所帮助
如果有什么不足的地方,希望您能指正,谢谢
