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）。