C# WinForm窗体应用（第四天）

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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。

 1 /// <summary> 2         /// 登录设置 3         /// </summary> 4         /// <param name="sender"></param> 5         /// <param name="e"></param> 6         private void btnLogin_Click(object sender, EventArgs e) 7         { 8             string userName = this.textBox1.Text; 9             string pwd = this.textBox2.Text;10             if(userName=="haha"){11                 if(pwd=="123456"){12                     MessageBox.Show("登陆成功！");13                     //链接两个页面14                     WFromMain mainWindow = new WFromMain();15                     mainWindow.Show();//展示WFromMain此窗体16                     this.Hide();//隐藏Form1窗体17                 }18                 else19                 {20                     MessageBox.Show("输入密码有误，请重新输入！");21                     this.textBox2.Text = "";22                 }23             }24             else25             {26                 MessageBox.Show("用户不存在！");27                 this.textBox1.Text = "";28                 this.textBox2.Text = "";29             }30         }

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：

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Threading.Tasks; 5 using System.Windows.Forms; 6  7 namespace WindowsFormLogin01 8 { 9     static class Program10     {11         /// <summary>12         /// 应用程序的主入口点。13         /// </summary>14         [STAThread]15         static void Main()16         {17             Application.EnableVisualStyles();18             Application.SetCompatibleTextRenderingDefault(false);19             Application.Run(new Form1());20         }21     }22 }

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）

  1 using System;  2 using System.Collections.Generic;  3 using System.ComponentModel;  4 using System.Data;  5 using System.Drawing;  6 using System.Linq;  7 using System.Text;  8 using System.Threading.Tasks;  9 using System.Windows.Forms; 10  11 namespace WindowsFormsDemo1 12 { 13     public partial class FrmMain1 : Form 14     { 15         public FrmMain1() 16         { 17             InitializeComponent(); 18         } 19  20         private void 保存ToolStripMenuItem_Click(object sender, EventArgs e) 21         { 22             MessageBox.Show("保存操作"); 23         } 24  25         private void EditToolStripMenuItem_Click(object sender, EventArgs e) 26         { 27             MessageBox.Show("编辑操作"); 28         } 29  30         private void AddEmloyeeToolStripMenuItem_Click(object sender, EventArgs e) 31         { 32             // MessageBox.Show("添加员工操作"); 33             FrmAddEmployee addEmployee = new FrmAddEmployee(); 34         35             //判断 是否有子窗体 36             if (this.MdiChildren == null || this.MdiChildren.Length == 0) { 37                 addEmployee.Show(); 38                 addEmployee.MdiParent = this;//给子窗体 指定 主窗体 39                 return; 40             } 41  42             bool flag = false; 43             foreach (var item in this.MdiChildren) 44             { 45                 if (item.Text == addEmployee.Text) { 46                     addEmployee = item as FrmAddEmployee; 47                     addEmployee.Activate(); 48                     flag = true; 49                     break; 50                 }    51             } 52             if (!flag) { 53                 addEmployee.Show(); 54                 addEmployee.MdiParent = this;//给子窗体 指定 主窗体 55             } 56         } 57  58         /// <summary> 59         /// 弹出修改窗体 60         /// </summary> 61         /// <param name="sender"></param> 62         /// <param name="e"></param> 63         private void ModifyEmployeeToolStripMenuItem_Click(object sender, EventArgs e) 64         { 65             FrmModifyEmployee modifyEmployee = new FrmModifyEmployee(); 66  67             if (this.MdiChildren == null || this.MdiChildren.Length == 0) 68             { 69                 modifyEmployee.Show(); 70                 modifyEmployee.MdiParent = this;//给子窗体 指定 主窗体 71                 return; 72             } 73             bool f = false; 74             foreach (var item in this.MdiChildren) 75             { 76                 if (modifyEmployee.Text == item.Text) { 77                     modifyEmployee = item as FrmModifyEmployee; 78                     modifyEmployee.Activate(); 79                     f = true; 80                     break; 81                 } 82             } 83  84             if (!f) { 85                 modifyEmployee.Show(); 86                 modifyEmployee.MdiParent = this; 87             } 88  89         } 90  91         private void FrmMain1_FormClosing(object sender, FormClosingEventArgs e) 92         { 93             Environment.Exit(0);//关闭整个运行环境 94           95         } 96  97         private void CloseAllToolStripMenuItem_Click(object sender, EventArgs e) 98         { 99 100             int len = this.MdiChildren.Length;101             for (int i = 0; i <len ; i++)102             {103                 Form frm = this.MdiChildren[0];104                 frm.Close();105             }106         }107     }108 }

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四、限制子窗体不超出父窗体界限

 1 private void SchoolToolStripMenuItem_Click(object sender, EventArgs e) 2         { 3             //点击后显示SchoolTan这个弹窗 4             SchoolTan schooltanchuang=new SchoolTan(); 5             schooltanchuang.Show(); 6             //让子窗体不超出父窗体界限 7             this.IsMdiContainer = true; 8             WFromMain mainForm = new WFromMain(); 9             schooltanchuang.MdiParent = this;10             /*11              *  方法：明确父子关系：12                     son form = new Form();13                     form.MdiParent = this(father);14                     form.show();15                     前提是先要设置father窗体16                     isMdiContainer = true; 17              * **/18         }

五、鼠标点击右键弹出菜单，并全部关闭弹出所有窗口。

1 private void 关闭全部窗体ToolStripMenuItem_Click(object sender, EventArgs e)2         {3             Environment.Exit(0);4         }

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）。

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