问一个登录问题（控件）

Question

//form2:void Main(){
 Application.Run(new Form2);
}public string un = null;
public string pw = null;public Form2(){
 Form1 f1 = new Form1(this);
 f1.ShowDialog();
}//form1:
private readonly Form2 f2 = null;
public Form1(Form2 f){
  f2 = f;
}private void logincontrol_onClick(...){
 f2.un = this.txtUserName.text;
 f2.pw = this.txtPassword.text;
 this.Close();
}

Answer 1

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;namespace LoginControlApp
{
/// <summary>
/// Summary description for LoginControl.
/// </summary>
public class LoginControl : System.Windows.Forms.UserControl
{
private System.Windows.Forms.Button login;
private System.Windows.Forms.Button cancel;
private System.Windows.Forms.Label nameLabel;
private System.Windows.Forms.TextBox password;
private System.Windows.Forms.Label passwordLabel;
private System.Windows.Forms.TextBox name;
/// <summary> 
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null; public LoginControl()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent(); // TODO: Add any initialization after the InitializeComponent call } /// <summary> 
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Component Designer generated code
/// <summary> 
/// Required method for Designer support - do not modify 
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.login = new System.Windows.Forms.Button();
this.cancel = new System.Windows.Forms.Button();
this.nameLabel = new System.Windows.Forms.Label();
this.name = new System.Windows.Forms.TextBox();
this.password = new System.Windows.Forms.TextBox();
this.passwordLabel = new System.Windows.Forms.Label();
this.SuspendLayout();
// 
// login
// 
this.login.Location = new System.Drawing.Point(168, 112);
this.login.Name = "login";
this.login.Size = new System.Drawing.Size(96, 24);
this.login.TabIndex = 0;
this.login.Text = "Login";
this.login.Click += new System.EventHandler(this.login_Click);
// 
// cancel
// 
this.cancel.Location = new System.Drawing.Point(40, 112);
this.cancel.Name = "cancel";
this.cancel.Size = new System.Drawing.Size(96, 24);
this.cancel.TabIndex = 1;
this.cancel.Text = "Cancel";
// 
// nameLabel
// 
this.nameLabel.Location = new System.Drawing.Point(56, 24);
this.nameLabel.Name = "nameLabel";
this.nameLabel.Size = new System.Drawing.Size(40, 16);
this.nameLabel.TabIndex = 2;
this.nameLabel.Text = "Name:";
// 
// name
// 
this.name.Location = new System.Drawing.Point(120, 24);
this.name.Name = "name";
this.name.Size = new System.Drawing.Size(120, 20);
this.name.TabIndex = 3;
this.name.Text = "";
// 
// password
// 
this.password.Location = new System.Drawing.Point(120, 64);
this.password.Name = "password";
this.password.PasswordChar = '*';
this.password.Size = new System.Drawing.Size(120, 20);
this.password.TabIndex = 4;
this.password.Text = "";
// 
// passwordLabel
// 
this.passwordLabel.Location = new System.Drawing.Point(40, 72);
this.passwordLabel.Name = "passwordLabel";
this.passwordLabel.Size = new System.Drawing.Size(64, 16);
this.passwordLabel.TabIndex = 5;
this.passwordLabel.Text = "Password:";
// 
// LoginControl
// 
this.Controls.Add(this.passwordLabel);
this.Controls.Add(this.password);
this.Controls.Add(this.name);
this.Controls.Add(this.nameLabel);
this.Controls.Add(this.cancel);
this.Controls.Add(this.login);
this.Name = "LoginControl";
this.Size = new System.Drawing.Size(312, 150);
this.ResumeLayout(false); }
#endregion private void login_Click(object sender, System.EventArgs e)
{
this.OnValidityCheck();
} public delegate void ValidityCheckEventHandler(object sender,ValidityCheckEventArgs e);
public class ValidityCheckEventArgs
{
public ValidityCheckEventArgs(string name,string password)
{
this._name=name;
this._password=password;
} private string _name=null;
private string _password=null;
private bool _result=false;
private string _message=null; public string Name
{
get{return this._name;}
}
public string Password
{
get{return this._password;}
}
public bool Result
{
get{return this._result;}
set{this._result=value;}
}
public string Message
{
get{return this._message;}
set{this._message=value;}
}
} public event ValidityCheckEventHandler ValidityCheck=null; protected virtual  void OnValidityCheck()
{
if(this.ValidityCheck!=null)
{
ValidityCheckEventArgs e=new ValidityCheckEventArgs(this.name.Text,this.password.Text);
this.ValidityCheck(this,e);
if(e.Result==true)
{
if(this.Parent is Form)
(this.Parent as Form).Close();
}
else
{
MessageBox.Show(e.Message);
}
}
}
}
}
//----------------------------------------
我觉得使用Event比较合适。