如何在两个窗体间传递参数的问题,谢谢 写在登陆窗口里,就是启动窗口内主窗口名为formain下定义一个变量就可以传了主窗体public string str="";登陆窗体formian aa=new formain();formain.str="信息";aa.Show(); 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 我刚做完登陆和主界面的程序,个人认为,把main方法放在主界面比较合适,因为如果放在登录窗体的话,登录成功后也不能关闭登录窗体。主界面Main函数如下: static void Main() { loginForm login=new loginForm(); login.ShowDialog(); if (loginForm.LoginSuccess) { Application.Run(new Function()); } else { Application.Exit(); } }登录成功后,把用户名保存到一个公用类的静态变量里头,也可以在登录窗体成功验证后,取的登录者的所有权限,这样整个系统的各个窗体都能得到登录者的身份了,也利于权限的判断。 不是说不能用全局变量。只是说要小心使用而已。这里要把变量声明为public,否则窗体之间就没有办法通信。如果有不当之处,请指点 LogonFrm 代码如下:using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;namespace LogonToMainForm{ public class LogonFrm : System.Windows.Forms.Form { #region 自定义的变量 private string User; private string sPwd; #endregion #region 自身对象 private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.TextBox txtUserId; private System.Windows.Forms.TextBox txtPwd; private System.Windows.Forms.Button btnOk; private System.Windows.Forms.Button btnCancel; /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.Container components = null; #endregion #region 构造函数与折构函数 public LogonFrm() { // // 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 // } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #endregion #region Windows Form Designer generated code /// <summary> /// 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。 /// </summary> private void InitializeComponent() { this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.txtUserId = new System.Windows.Forms.TextBox(); this.txtPwd = new System.Windows.Forms.TextBox(); this.btnOk = new System.Windows.Forms.Button(); this.btnCancel = new System.Windows.Forms.Button(); this.SuspendLayout(); // // label1 // this.label1.AutoSize = true; this.label1.Location = new System.Drawing.Point(52, 40); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(42, 14); this.label1.TabIndex = 0; this.label1.Text = "UserID"; // // label2 // this.label2.AutoSize = true; this.label2.Location = new System.Drawing.Point(48, 80); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(54, 14); this.label2.TabIndex = 1; this.label2.Text = "PassWord"; // // txtUserId // this.txtUserId.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle; this.txtUserId.Location = new System.Drawing.Point(108, 36); this.txtUserId.Name = "txtUserId"; this.txtUserId.Size = new System.Drawing.Size(116, 21); this.txtUserId.TabIndex = 2; this.txtUserId.Text = ""; // // txtPwd // this.txtPwd.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle; this.txtPwd.Location = new System.Drawing.Point(108, 76); this.txtPwd.Name = "txtPwd"; this.txtPwd.Size = new System.Drawing.Size(116, 21); this.txtPwd.TabIndex = 3; this.txtPwd.Text = ""; // // btnOk // this.btnOk.FlatStyle = System.Windows.Forms.FlatStyle.Popup; this.btnOk.Location = new System.Drawing.Point(52, 136); this.btnOk.Name = "btnOk"; this.btnOk.TabIndex = 4; this.btnOk.Text = "OK"; this.btnOk.Click += new System.EventHandler(this.btnOk_Click); // // btnCancel // this.btnCancel.FlatStyle = System.Windows.Forms.FlatStyle.Popup; this.btnCancel.Location = new System.Drawing.Point(172, 136); this.btnCancel.Name = "btnCancel"; this.btnCancel.TabIndex = 5; this.btnCancel.Text = "Cancel"; this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click); // // LogonFrm // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(302, 190); this.ControlBox = false; this.Controls.AddRange(new System.Windows.Forms.Control[] { this.btnCancel, this.btnOk, this.txtPwd, this.txtUserId, this.label2, this.label1}); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle; this.Name = "LogonFrm"; this.ResumeLayout(false); } #endregion #region 应用程序的主入口点 /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new LogonFrm()); } #endregion #region Event private void btnOk_Click(object sender, System.EventArgs e) { if(this.txtUserId.Text!=""&&this.txtPwd.Text!="") { this.User=this.txtUserId.Text.Trim(); this.sPwd=this.txtPwd.Text.Trim(); MainFrm main=new MainFrm(this.User,this.sPwd); this.Visible=false; main.Show(); } else { MessageBox.Show("用户名和密码不能为空!"); this.txtUserId.Text=""; this.txtPwd.Text=""; this.txtUserId.Focus(); return; } } private void btnCancel_Click(object sender, System.EventArgs e) { Application.Exit(); } #endregion }}MainFrm 代码如下:using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;namespace LogonToMainForm{ public class MainFrm : System.Windows.Forms.Form { private System.ComponentModel.Container components = null; private string myUser; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private string myPwd; public MainFrm(string user,string pwd) { InitializeComponent(); myUser=user;//将LogonFrm中的变量User传给myUser myPwd=pwd;//将LogonFrm中的变量sPwd传给myPwd } protected override void Dispose( bool disposing ) { if( disposing ) { if(components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// <summary> /// 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。 /// </summary> private void InitializeComponent() { this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.SuspendLayout(); // // label1 // this.label1.Location = new System.Drawing.Point(148, 52); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(144, 52); this.label1.TabIndex = 0; this.label1.Text = "label1"; // // label2 // this.label2.Location = new System.Drawing.Point(148, 120); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(144, 48); this.label2.TabIndex = 1; this.label2.Text = "label2"; // // MainFrm // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(504, 313); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.label2, this.label1}); this.Name = "MainFrm"; this.Text = "MainFrm"; this.Load += new System.EventHandler(this.MainFrm_Load); this.Closed += new System.EventHandler(this.MainFrm_Closed); this.ResumeLayout(false); } #endregion private void MainFrm_Closed(object sender, System.EventArgs e) { Application.Exit(); } private void MainFrm_Load(object sender, System.EventArgs e) { this.label1.Text=""; this.label2.Text=""; this.label1.Text="这是在LogonFrm中输入的用户名:"+this.myUser; this.label2.Text="这是在LogonFrm中输入的密码:"+this.myPwd; } }}我觉得没有必要一定要关闭LogonFrm,可以让它隐藏起来. main函数肯定应该放在主窗体。 连接access07,结果出现不可识别数据库 怎么去掉字符串最后一位啊? 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static void Main()
{
loginForm login=new loginForm();
login.ShowDialog();
if (loginForm.LoginSuccess)
{
Application.Run(new Function());
}
else
{
Application.Exit();
}
}
登录成功后,把用户名保存到一个公用类的静态变量里头,也可以在登录窗体成功验证后,取的登录者的所有权限,这样整个系统的各个窗体都能得到登录者的身份了,也利于权限的判断。
如果有不当之处,请指点
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace LogonToMainForm
{
public class LogonFrm : System.Windows.Forms.Form
{
#region 自定义的变量
private string User;
private string sPwd;
#endregion
#region 自身对象
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox txtUserId;
private System.Windows.Forms.TextBox txtPwd;
private System.Windows.Forms.Button btnOk;
private System.Windows.Forms.Button btnCancel;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
#endregion
#region 构造函数与折构函数
public LogonFrm()
{
//
// 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
//
} /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#endregion
#region Windows Form Designer generated code
/// <summary>
/// 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。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.txtUserId = new System.Windows.Forms.TextBox();
this.txtPwd = new System.Windows.Forms.TextBox();
this.btnOk = new System.Windows.Forms.Button();
this.btnCancel = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(52, 40);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(42, 14);
this.label1.TabIndex = 0;
this.label1.Text = "UserID";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(48, 80);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(54, 14);
this.label2.TabIndex = 1;
this.label2.Text = "PassWord";
//
// txtUserId
//
this.txtUserId.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtUserId.Location = new System.Drawing.Point(108, 36);
this.txtUserId.Name = "txtUserId";
this.txtUserId.Size = new System.Drawing.Size(116, 21);
this.txtUserId.TabIndex = 2;
this.txtUserId.Text = "";
//
// txtPwd
//
this.txtPwd.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtPwd.Location = new System.Drawing.Point(108, 76);
this.txtPwd.Name = "txtPwd";
this.txtPwd.Size = new System.Drawing.Size(116, 21);
this.txtPwd.TabIndex = 3;
this.txtPwd.Text = "";
//
// btnOk
//
this.btnOk.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
this.btnOk.Location = new System.Drawing.Point(52, 136);
this.btnOk.Name = "btnOk";
this.btnOk.TabIndex = 4;
this.btnOk.Text = "OK";
this.btnOk.Click += new System.EventHandler(this.btnOk_Click);
//
// btnCancel
//
this.btnCancel.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
this.btnCancel.Location = new System.Drawing.Point(172, 136);
this.btnCancel.Name = "btnCancel";
this.btnCancel.TabIndex = 5;
this.btnCancel.Text = "Cancel";
this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
//
// LogonFrm
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(302, 190);
this.ControlBox = false;
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.btnCancel,
this.btnOk,
this.txtPwd,
this.txtUserId,
this.label2,
this.label1});
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.Name = "LogonFrm";
this.ResumeLayout(false); }
#endregion
#region 应用程序的主入口点
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new LogonFrm());
}
#endregion
#region Event
private void btnOk_Click(object sender, System.EventArgs e)
{
if(this.txtUserId.Text!=""&&this.txtPwd.Text!="")
{
this.User=this.txtUserId.Text.Trim();
this.sPwd=this.txtPwd.Text.Trim();
MainFrm main=new MainFrm(this.User,this.sPwd);
this.Visible=false;
main.Show();
}
else
{
MessageBox.Show("用户名和密码不能为空!");
this.txtUserId.Text="";
this.txtPwd.Text="";
this.txtUserId.Focus();
return;
}
} private void btnCancel_Click(object sender, System.EventArgs e)
{
Application.Exit();
}
#endregion
}
}
MainFrm 代码如下:
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;namespace LogonToMainForm
{
public class MainFrm : System.Windows.Forms.Form
{
private System.ComponentModel.Container components = null;
private string myUser;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private string myPwd;
public MainFrm(string user,string pwd)
{
InitializeComponent();
myUser=user;//将LogonFrm中的变量User传给myUser
myPwd=pwd;//将LogonFrm中的变量sPwd传给myPwd
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Windows Form Designer generated code
/// <summary>
/// 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。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(148, 52);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(144, 52);
this.label1.TabIndex = 0;
this.label1.Text = "label1";
//
// label2
//
this.label2.Location = new System.Drawing.Point(148, 120);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(144, 48);
this.label2.TabIndex = 1;
this.label2.Text = "label2";
//
// MainFrm
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(504, 313);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label2,
this.label1});
this.Name = "MainFrm";
this.Text = "MainFrm";
this.Load += new System.EventHandler(this.MainFrm_Load);
this.Closed += new System.EventHandler(this.MainFrm_Closed);
this.ResumeLayout(false); }
#endregion private void MainFrm_Closed(object sender, System.EventArgs e)
{
Application.Exit();
} private void MainFrm_Load(object sender, System.EventArgs e)
{
this.label1.Text="";
this.label2.Text="";
this.label1.Text="这是在LogonFrm中输入的用户名:"+this.myUser;
this.label2.Text="这是在LogonFrm中输入的密码:"+this.myPwd;
}
}
}我觉得没有必要一定要关闭LogonFrm,可以让它隐藏起来.