C# WinForm窗体应用（第四天）

一、点击登录按钮，将两个窗体进行连接，并进行用户名和密码验证。

 /// <summary>

         /// 登录设置

         /// </summary>

         /// <param name="sender"></param>

         /// <param name="e"></param>

         private void btnLogin_Click(object sender, EventArgs e)

         {

             string userName = this.textBox1.Text;

             string pwd = this.textBox2.Text;

             if(userName=="haha"){

                 if(pwd==""){

                     MessageBox.Show("登陆成功！");

                     //链接两个页面

                     WFromMain mainWindow = new WFromMain();

                     mainWindow.Show();//展示WFromMain此窗体

                     this.Hide();//隐藏Form1窗体

                 }

                 else

                 {

                     MessageBox.Show("输入密码有误，请重新输入！");

                     this.textBox2.Text = "";

                 }

             }

             else

             {

                 MessageBox.Show("用户不存在！");

                 this.textBox1.Text = "";

                 this.textBox2.Text = "";

             }

         }

二、在同一个解决方案中调用不同窗体的方法

在如下位置进行修改，并且切换调用即可：

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace WindowsFormLogin01

 {

     static class Program

     {

         /// <summary>

         /// 应用程序的主入口点。

         /// </summary>

         [STAThread]

         static void Main()

         {

             Application.EnableVisualStyles();

             Application.SetCompatibleTextRenderingDefault(false);

             Application.Run(new Form1());

         }

     }

 }

针对不同的窗体，要切换时对 Application.Run(new Form1()); 这一行的 Form1 进行修改即可。

三、项目实现代码（暂存）

 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace WindowsFormsDemo1

 {

     public partial class FrmMain1 : Form

     {

         public FrmMain1()

         {

             InitializeComponent();

         }

         private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)

         {

             MessageBox.Show("保存操作");

         }

         private void EditToolStripMenuItem_Click(object sender, EventArgs e)

         {

             MessageBox.Show("编辑操作");

         }

         private void AddEmloyeeToolStripMenuItem_Click(object sender, EventArgs e)

         {

             // MessageBox.Show("添加员工操作");

             FrmAddEmployee addEmployee = new FrmAddEmployee();

             //判断 是否有子窗体

             if (this.MdiChildren == null || this.MdiChildren.Length == ) {

                 addEmployee.Show();

                 addEmployee.MdiParent = this;//给子窗体 指定 主窗体

                 return;

             }

             bool flag = false;

             foreach (var item in this.MdiChildren)

             {

                 if (item.Text == addEmployee.Text) {

                     addEmployee = item as FrmAddEmployee;

                     addEmployee.Activate();

                     flag = true;

                     break;

                 }

             }

             if (!flag) {

                 addEmployee.Show();

                 addEmployee.MdiParent = this;//给子窗体 指定 主窗体

             }

         }

         /// <summary>

         /// 弹出修改窗体

         /// </summary>

         /// <param name="sender"></param>

         /// <param name="e"></param>

         private void ModifyEmployeeToolStripMenuItem_Click(object sender, EventArgs e)

         {

             FrmModifyEmployee modifyEmployee = new FrmModifyEmployee();

             if (this.MdiChildren == null || this.MdiChildren.Length == )

             {

                 modifyEmployee.Show();

                 modifyEmployee.MdiParent = this;//给子窗体 指定 主窗体

                 return;

             }

             bool f = false;

             foreach (var item in this.MdiChildren)

             {

                 if (modifyEmployee.Text == item.Text) {

                     modifyEmployee = item as FrmModifyEmployee;

                     modifyEmployee.Activate();

                     f = true;

                     break;

                 }

             }

             if (!f) {

                 modifyEmployee.Show();

                 modifyEmployee.MdiParent = this;

             }

         }

         private void FrmMain1_FormClosing(object sender, FormClosingEventArgs e)

         {

             Environment.Exit();//关闭整个运行环境

         }

         private void CloseAllToolStripMenuItem_Click(object sender, EventArgs e)

         {

             int len = this.MdiChildren.Length;

             for (int i = ; i <len ; i++)

             {

                 Form frm = this.MdiChildren[];

                 frm.Close();

             }

         }

     }

 }

四、限制子窗体不超出父窗体界限

 private void SchoolToolStripMenuItem_Click(object sender, EventArgs e)

         {

             //点击后显示SchoolTan这个弹窗

             SchoolTan schooltanchuang=new SchoolTan();

             schooltanchuang.Show();

             //让子窗体不超出父窗体界限

             this.IsMdiContainer = true;

             WFromMain mainForm = new WFromMain();

             schooltanchuang.MdiParent = this;

             /*

              *  方法：明确父子关系：

                     son form = new Form();

                     form.MdiParent = this(father);

                     form.show();

                     前提是先要设置father窗体

                     isMdiContainer = true;

              * **/

         }

五、鼠标点击右键弹出菜单，并全部关闭弹出所有窗口。

 private void 关闭全部窗体ToolStripMenuItem_Click(object sender, EventArgs e)

         {

             Environment.Exit();

         }

并将右边属性菜单的contextMenuStrip进行设置即可（此属性是点击父窗体进行设置）。

巴特西

C# WinForm窗体应用（第四天）

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