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=="123456"){
                    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 == 0) {
                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 == 0)
            {
                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(0);//关闭整个运行环境
         
        }

        private void CloseAllToolStripMenuItem_Click(object sender, EventArgs e)
        {

            int len = this.MdiChildren.Length;
            for (int i = 0; i <len ; i++)
            {
                Form frm = this.MdiChildren[0];
                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(0);
        }  

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）。