devbox
小蓝xlanll
这个屌丝很懒，什么也没留下！
关注作者
热门标签
热门文章
当前位置:   article > 正文

C# 通过子窗体刷新父窗体：窗体控制_c#子窗口 刷新父窗体

作者：小蓝xlanll | 2024-06-08 17:45:25

赞

踩

c#子窗口 刷新父窗体

目录

1、实现方法 

2.SqlCommand类

3.实例的主窗体Frm_Main： 

（1）Frm_Main.Designer.cs

（2）Frm_Main.cs

4.实例的子窗体Frm_Child： 

（1） Frm_Child.Designer.cs

（2）Frm_Child.cs

5.生成效果

（1）生成

（2）添加

（3）添加后

（4）清空

        在一些软件，比如，进销存管理系统中添加销售单信息时，每个销售单都可能对应多种商品，而且在向销售单中添加商品时，一般都是在新弹出的窗体中选择商品，这时就涉及通过子窗体刷新父窗体的问题。

1、实现方法 

        实现通过子窗体刷新父窗体时，主要通过在自定义事件中执行数据绑定来对主窗体进行刷新，即当子窗体产生更新操作时，通过子窗体的一个方法触发主窗体中对应的事件，这个过程主要用到了EventHandler事件。

        EventHandler事件主要是通过EventHandler委托来实现的，该委托表示处理不包含事件数据的事件的方法。语法格式如下：

  1. public delegate void EventHandler(Object sender,EventArgs e)
  3. 参数说明
  4. Sender：事件源。
  5. e：不包含任何事件数据的EventArgs事件数据。

        例如，通过使用EventHandler事件为子窗体添加一个事件处理程序，以便能够刷新父窗体中的数据。

        在子窗体里：

  1. /// <summary>
  2. /// 某一个事件，比如，添加
  3. /// </summary>
  4. private void Button1_Click(object? sender, EventArgs e)
  5. {
  6.     GlobalFlag = true;                          //设定标识的值为true
  7.     if (!(comboBox1.Items.Equals(idContent)))   //当Combobox控件中不存在将添加的信息时
  8.     {
  9.         comboBox1.Items.Add(idContent!);        //在Combobox控件中添加一条记录
  10.     }
  11.     UpdateData();
  12. }
  13.  
  14. // 其它
  15.  
  16. /// <summary>
  17. /// 更新DataGridView控件中的内容
  18. /// </summary>
  19. protected void UpdateData()
  20. {
  21.     UpdateDataGridView?.Invoke(this, EventArgs.Empty);
  22. }

         在主窗体里：

  1. // 添加子窗体的事件
  2. public void CreateFrmChild()
  3. {
  4.     Frm_Child BabyWindow = new()
  5.     {
  6.         MdiParent = this,
  7.     };
  8.     dataGridView1.Controls.Add(BabyWindow);
  9.     BabyWindow.UpdateDataGridView += new EventHandler(BabyWindow_UpdateDataGridView!);
  10.     BabyWindow.Show();
  11. }
  12.  
  13. // 其它
  14.  
  15. /// <summary>
  16. /// 实现事件委托
  17. /// </summary>
  18. void BabyWindow_UpdateDataGridView(object sender, EventArgs e)
  19. {
  20.     // 其它
  21. }

2.SqlCommand类

        本实例中使用了SQL，主窗体的数据读取自SQL，在子窗体里更新，然后回写SQL，其结果再次更新到主窗体。

        在C#中执行SQL语句时，可以使用SqlCommand类，该类主要用于向SQL Server数据库发送SQL语句。

        本实例的数据库连接字符串：

  1. //数据库连接字符串
  2. readonly string? ConnString = "Data Source=DESKTOP-3LV13FS;DataBase=db_TomeOne;integrated security=SSPI;TrustServerCertificate=true;";

        还有，在.NET 8.0中，要使用命名空间：using Microsoft.Data.SqlClient;因为 using System.Data.SqlClient; 已经废弃。

3.实例的主窗体Frm_Main： 

（1）Frm_Main.Designer.cs

  1. namespace _197
  2. {
  3.     partial class Frm_Main
  4.     {
  5.         /// <summary>
  6.         ///  Required designer variable.
  7.         /// </summary>
  8.         private System.ComponentModel.IContainer components = null;
  9.  
  10.         /// <summary>
  11.         ///  Clean up any resources being used.
  12.         /// </summary>
  13.         /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
  14.         protected override void Dispose(bool disposing)
  15.         {
  16.             if (disposing && (components != null))
  17.             {
  18.                 components.Dispose();
  19.             }
  20.             base.Dispose(disposing);
  21.         }
  22.  
  23.         #region Windows Form Designer generated code
  24.  
  25.         /// <summary>
  26.         ///  Required method for Designer support - do not modify
  27.         ///  the contents of this method with the code editor.
  28.         /// </summary>
  29.         private void InitializeComponent()
  30.         {
  31.             menuStrip1 = new MenuStrip();
  32.             toolStripMenuItem1 = new ToolStripMenuItem();
  33.             toolStripMenuItem2 = new ToolStripMenuItem();
  34.             toolStripMenuItem3 = new ToolStripMenuItem();
  35.             dataGridView1 = new DataGridView();
  36.             menuStrip1.SuspendLayout();
  37.             ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
  38.             SuspendLayout();
  39.             // 
  40.             // menuStrip1
  41.             // 
  42.             menuStrip1.BackColor = SystemColors.ControlDark;
  43.             menuStrip1.Items.AddRange(new ToolStripItem[] { toolStripMenuItem1 });
  44.             menuStrip1.Location = new Point(0, 0);
  45.             menuStrip1.Name = "menuStrip1";
  46.             menuStrip1.Size = new Size(335, 25);
  47.             menuStrip1.TabIndex = 0;
  48.             menuStrip1.Text = "menuStrip1";
  49.             // 
  50.             // toolStripMenuItem1
  51.             // 
  52.             toolStripMenuItem1.DropDownItems.AddRange(new ToolStripItem[] { toolStripMenuItem2, toolStripMenuItem3 });
  53.             toolStripMenuItem1.Name = "toolStripMenuItem1";
  54.             toolStripMenuItem1.Size = new Size(44, 21);
  55.             toolStripMenuItem1.Text = "操作";
  56.             // 
  57.             // toolStripMenuItem2
  58.             // 
  59.             toolStripMenuItem2.Name = "toolStripMenuItem2";
  60.             toolStripMenuItem2.Size = new Size(136, 22);
  61.             toolStripMenuItem2.Text = "添加或删除";
  62.             toolStripMenuItem2.Click += ToolStripMenuItem2_Click;
  63.             // 
  64.             // toolStripMenuItem3
  65.             // 
  66.             toolStripMenuItem3.Name = "toolStripMenuItem3";
  67.             toolStripMenuItem3.Size = new Size(136, 22);
  68.             toolStripMenuItem3.Text = "退出";
  69.             toolStripMenuItem3.Click += ToolStripMenuItem3_Click;
  70.             // 
  71.             // dataGridView1
  72.             // 
  73.             dataGridView1.AllowUserToAddRows = false;
  74.             dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
  75.             dataGridView1.Dock = DockStyle.Fill;
  76.             dataGridView1.Location = new Point(0, 25);
  77.             dataGridView1.Name = "dataGridView1";
  78.             dataGridView1.Size = new Size(335, 178);
  79.             dataGridView1.TabIndex = 1;
  80.             // 
  81.             // Frm_Main
  82.             // 
  83.             AutoScaleDimensions = new SizeF(7F, 17F);
  84.             AutoScaleMode = AutoScaleMode.Font;
  85.             ClientSize = new Size(335, 203);
  86.             Controls.Add(dataGridView1);
  87.             Controls.Add(menuStrip1);
  88.             IsMdiContainer = true;
  89.             MainMenuStrip = menuStrip1;
  90.             Name = "Frm_Main";
  91.             Text = "主窗体";
  92.             Load += Frm_Main_Load;
  93.             menuStrip1.ResumeLayout(false);
  94.             menuStrip1.PerformLayout();
  95.             ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
  96.             ResumeLayout(false);
  97.             PerformLayout();
  98.         }
  99.  
  100.         #endregion
  101.  
  102.         private MenuStrip menuStrip1;
  103.         private ToolStripMenuItem toolStripMenuItem1;
  104.         private ToolStripMenuItem toolStripMenuItem2;
  105.         private ToolStripMenuItem toolStripMenuItem3;
  106.         private DataGridView dataGridView1;
  107.     }
  108. }

（2）Frm_Main.cs

  1. // 通过子窗体刷新父窗体
  2. // 设置主窗体的IsMdiContainer=true;
  3. using System.Data;
  4. using Microsoft.Data.SqlClient;
  5.  
  6. namespace _197
  7. {
  8.     public partial class Frm_Main : Form
  9.     {   
  10.         public Frm_Main()
  11.         {
  12.             InitializeComponent();
  13.         }
  14.  
  15.         #region 声明的变量
  16.         private static bool flag = false;   //标识是否创建新的子窗体
  17.         readonly Frm_Child BabyWindow = new();//实例化一个子窗体
  18.         readonly DataSet PubsSet = new();   //定义一个数据集对象
  19.         private static string[]? iDArray;   //声明一个一维字符串数组
  20.         public DataTable? IDTable;          //声明一个数据表对象
  21.         SqlDataAdapter? IDAdapter;          //声明一个数据读取器对象
  22.         SqlDataAdapter? PubsAdapter;        //声明一个数据读取器对象
  23.         SqlConnection? ConnPubs;            //声明一个数据库连接对象
  24.         SqlCommand? PersonalInformation;    //声明一个执行SQL语句的对象
  25.  
  26.         public static string[]? IDArray { get => iDArray; set => iDArray = value; }
  27.         public static bool Flag { get => flag; set => flag = value; }
  28.         
  29.         readonly string? ConnString         //数据库连接字符串
  30.             = "Data Source=DESKTOP-3LV13FS;DataBase=db_TomeOne;integrated security=SSPI;TrustServerCertificate=true;";
  31.         #endregion
  32.  
  33.         private void Frm_Main_Load(object? sender, EventArgs e)
  34.         {
  35.             string AdapterString = "select userID as 编号,userName as 姓名 ,phone as 电话,address as 住址 from tb_User";//用于查询的字符串
  36.             string IDString = "select userID from tb_User";//读取数据库中用户的ID编号字符串
  37.             ConnPubs = new SqlConnection(ConnString);//建立数据库连接
  38.             PubsAdapter = new SqlDataAdapter(AdapterString, ConnPubs);//创建PubsAdapter数据读取器
  39.             IDAdapter = new SqlDataAdapter(IDString, ConnPubs);       //用于读取用户编号的读取器
  40.             PubsAdapter.Fill(PubsSet, "tb_User");            //填充PubsSet数据集
  41.             IDAdapter.Fill(PubsSet, "ID");                   //填充PubsSet数据集
  42.             DataTable PubsTable = PubsSet.Tables["tb_User"]!;//将数据写入PubsTable表
  43.             IDTable = PubsSet.Tables["ID"]!;                 //将数据写入ID表
  44.             IDArray = new string[IDTable.Rows.Count];        //为数组定义最大长度
  45.             dataGridView1.DataSource = PubsTable.DefaultView;//设置dataGridView1的数据源
  46.             for (int i = 0; i < IDTable.Rows.Count; i++)     //循环遍历数据表中的每一行数据
  47.             {
  48.                 for (int j = 0; j < IDTable.Columns.Count; j++)//循环遍历数据表中的每一列数据
  49.                 {
  50.                     IDArray[i] = IDTable.Rows[i][j].ToString()!;//将数据表中的数据添加至一个一维数组
  51.                 }
  52.             }
  53.         }
  54.  
  55.         #region 创建子窗体的CreateFrmChild方法
  56.         /// <summary>
  57.         /// 设置子窗体的父窗体为当前窗体;
  58.         /// 实例化一个子窗体;
  59.         /// 在DataGridView控件中添加子窗体;
  60.         /// 显示子窗体;
  61.         /// </summary>
  62.         public void CreateFrmChild()
  63.         {
  64.             Frm_Child BabyWindow = new()
  65.             {
  66.                 MdiParent = this,
  67.             };
  68.             dataGridView1.Controls.Add(BabyWindow);
  69.             BabyWindow.UpdateDataGridView += new EventHandler(BabyWindow_UpdateDataGridView!);
  70.             BabyWindow.Show();
  71.         }
  72.         /// <summary>
  73.         /// 事件委托
  74.         /// </summary>
  75.         void BabyWindow_UpdateDataGridView(object sender, EventArgs e)
  76.         {
  77.             if (Frm_Child.GlobalFlag == false)    //当单击删除按钮时
  78.             {
  79.                 if (ConnPubs!.State == ConnectionState.Closed) //当数据库处于断开状态时
  80.                 {
  81.                     ConnPubs.Open();              //打开数据库的连接
  82.                 }
  83.                 string AfreshString = "delete tb_User where userID=" + Frm_Child.DeleteID!.Trim();//定义一个删除数据的字符串
  84.                 PersonalInformation = new SqlCommand(AfreshString, ConnPubs); //执行删除数据库字段
  85.                 PersonalInformation.ExecuteNonQuery(); //执行SQL语句并返回受影响的行数
  86.                 ConnPubs.Close();                      //关闭数据库
  87.                 DisplayData();                         //显示数据库更新后的内容
  88.                 MessageBox.Show("数据删除成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
  89.             }
  90.             else
  91.             {
  92.                 if (ConnPubs!.State == ConnectionState.Closed) //当数据库处于关闭状态时
  93.                 {
  94.                     ConnPubs.Open();    //打开数据库
  95.                 }
  96.                 string InsertString = "insert into tb_User values('" + Frm_Child.IdContent + "','" + Frm_Child.NameContent + "','" + Frm_Child.PhoneContent + "','" + Frm_Child.AddressContent + "')";//定义一个插入数据的字符串变量
  97.                 PersonalInformation = new SqlCommand(InsertString, ConnPubs);//执行插入数据库字段
  98.                 PersonalInformation.ExecuteNonQuery();          //执行SQL语句并返回受影响的行数
  99.                 ConnPubs.Close();        //关闭数据库
  100.                 DisplayData();           //显示更新后的数据
  101.                 MessageBox.Show("数据添加成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
  102.             }
  103.         }
  104.         #endregion
  105.  
  106.         #region 用于读取数据库的DisplayData方法
  107.         public void DisplayData()
  108.         {
  109.             PubsSet.Clear();
  110.             ConnPubs = new SqlConnection(ConnString); 
  111.             string DisplayString = "select userId as 编号,userName as 姓名 ,phone as 电话,address as 住址 from tb_User";//定义读取数据库的字段
  112.             SqlDataAdapter PersonalAdapter = new(DisplayString, ConnPubs);    //定义一个读取数据库数据的读取器
  113.             PersonalAdapter.Fill(PubsSet, "tb_User");                                            //向表DisplayTable中填充数据
  114.             dataGridView1.DataSource = PubsSet.Tables["tb_User"]!.DefaultView; //设定DataGridView控件的数据源
  115.         }
  116.         #endregion
  117.         /// <summary>
  118.         /// 添加或删除记录
  119.         /// 创建子窗体的CreateFrmChild方法
  120.         /// </summary>
  121.         private void ToolStripMenuItem2_Click(object sender, EventArgs e)
  122.         {
  123.             if (flag == false)   //判断标识的值决定是否创建窗体
  124.             {
  125.                 CreateFrmChild();//创建子窗体
  126.             }
  127.             for (int i = 0; i < dataGridView1.Controls.Count; i++)                      //循环遍历DataGridView控件上的控件集
  128.             {
  129.                 if (dataGridView1.Controls[i].Name.Equals(BabyWindow.Name)) //当存在子窗体时
  130.                 {
  131.                     flag = true; //改变标识Flag的值
  132.                     break;       //退出循环体
  133.                 }
  134.             }
  135.         }
  136.         /// <summary>
  137.         /// 退出
  138.         /// </summary>
  139.         private void ToolStripMenuItem3_Click(object sender, EventArgs e)
  140.         {
  141.             Application.Exit();
  142.         }
  143.     }
  144. }

4.实例的子窗体Frm_Child： 

（1） Frm_Child.Designer.cs

  1. namespace _197
  2. {
  3.     partial class Frm_Child
  4.     {
  5.         /// <summary>
  6.         /// Required designer variable.
  7.         /// </summary>
  8.         private System.ComponentModel.IContainer components = null;
  9.  
  10.         /// <summary>
  11.         /// Clean up any resources being used.
  12.         /// </summary>
  13.         /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
  14.         protected override void Dispose(bool disposing)
  15.         {
  16.             if (disposing && (components != null))
  17.             {
  18.                 components.Dispose();
  19.             }
  20.             base.Dispose(disposing);
  21.         }
  22.  
  23.         #region Windows Form Designer generated code
  24.  
  25.         /// <summary>
  26.         /// Required method for Designer support - do not modify
  27.         /// the contents of this method with the code editor.
  28.         /// </summary>
  29.         private void InitializeComponent()
  30.         {
  31.             groupBox1 = new GroupBox();
  32.             button2 = new Button();
  33.             button1 = new Button();
  34.             Record_Address = new TextBox();
  35.             Record_Phone = new TextBox();
  36.             Record_Name = new TextBox();
  37.             Record_ID = new TextBox();
  38.             label4 = new Label();
  39.             label3 = new Label();
  40.             label2 = new Label();
  41.             label1 = new Label();
  42.             groupBox2 = new GroupBox();
  43.             button3 = new Button();
  44.             comboBox1 = new ComboBox();
  45.             label5 = new Label();
  46.             groupBox1.SuspendLayout();
  47.             groupBox2.SuspendLayout();
  48.             SuspendLayout();
  49.             // 
  50.             // groupBox1
  51.             // 
  52.             groupBox1.Controls.Add(button2);
  53.             groupBox1.Controls.Add(button1);
  54.             groupBox1.Controls.Add(Record_Address);
  55.             groupBox1.Controls.Add(Record_Phone);
  56.             groupBox1.Controls.Add(Record_Name);
  57.             groupBox1.Controls.Add(Record_ID);
  58.             groupBox1.Controls.Add(label4);
  59.             groupBox1.Controls.Add(label3);
  60.             groupBox1.Controls.Add(label2);
  61.             groupBox1.Controls.Add(label1);
  62.             groupBox1.Location = new Point(12, 12);
  63.             groupBox1.Name = "groupBox1";
  64.             groupBox1.Size = new Size(270, 157);
  65.             groupBox1.TabIndex = 0;
  66.             groupBox1.TabStop = false;
  67.             groupBox1.Text = "添加信息";
  68.             // 
  69.             // button2
  70.             // 
  71.             button2.Location = new Point(187, 56);
  72.             button2.Name = "button2";
  73.             button2.Size = new Size(75, 23);
  74.             button2.TabIndex = 9;
  75.             button2.Text = "清空";
  76.             button2.UseVisualStyleBackColor = true;
  77.             button2.Click += Button2_Click;
  78.             // 
  79.             // button1
  80.             // 
  81.             button1.Location = new Point(187, 25);
  82.             button1.Name = "button1";
  83.             button1.Size = new Size(77, 23);
  84.             button1.TabIndex = 8;
  85.             button1.Text = "提交";
  86.             button1.UseVisualStyleBackColor = true;
  87.             button1.Click += Button1_Click;
  88.             // 
  89.             // Record_Address
  90.             // 
  91.             Record_Address.Location = new Point(72, 118);
  92.             Record_Address.Name = "Record_Address";
  93.             Record_Address.Size = new Size(100, 23);
  94.             Record_Address.TabIndex = 7;
  95.             Record_Address.TextChanged += Record_Address_TextChanged;
  96.             // 
  97.             // Record_Phone
  98.             // 
  99.             Record_Phone.Location = new Point(72, 87);
  100.             Record_Phone.Name = "Record_Phone";
  101.             Record_Phone.Size = new Size(100, 23);
  102.             Record_Phone.TabIndex = 6;
  103.             Record_Phone.TextChanged += Record_Phone_TextChanged;
  104.             // 
  105.             // Record_Name
  106.             // 
  107.             Record_Name.Location = new Point(72, 56);
  108.             Record_Name.Name = "Record_Name";
  109.             Record_Name.Size = new Size(100, 23);
  110.             Record_Name.TabIndex = 5;
  111.             Record_Name.TextChanged += Record_Name_TextChanged;
  112.             // 
  113.             // Record_ID
  114.             // 
  115.             Record_ID.Location = new Point(72, 25);
  116.             Record_ID.Name = "Record_ID";
  117.             Record_ID.Size = new Size(100, 23);
  118.             Record_ID.TabIndex = 4;
  119.             Record_ID.TextChanged += Record_ID_TextChanged;
  120.             // 
  121.             // label4
  122.             // 
  123.             label4.AutoSize = true;
  124.             label4.Location = new Point(11, 118);
  125.             label4.Name = "label4";
  126.             label4.Size = new Size(44, 17);
  127.             label4.TabIndex = 3;
  128.             label4.Text = "地址：";
  129.             // 
  130.             // label3
  131.             // 
  132.             label3.AutoSize = true;
  133.             label3.Location = new Point(11, 87);
  134.             label3.Name = "label3";
  135.             label3.Size = new Size(44, 17);
  136.             label3.TabIndex = 2;
  137.             label3.Text = "电话：";
  138.             // 
  139.             // label2
  140.             // 
  141.             label2.AutoSize = true;
  142.             label2.Location = new Point(11, 56);
  143.             label2.Name = "label2";
  144.             label2.Size = new Size(44, 17);
  145.             label2.TabIndex = 1;
  146.             label2.Text = "姓名：";
  147.             // 
  148.             // label1
  149.             // 
  150.             label1.AutoSize = true;
  151.             label1.Location = new Point(11, 25);
  152.             label1.Name = "label1";
  153.             label1.Size = new Size(44, 17);
  154.             label1.TabIndex = 0;
  155.             label1.Text = "编号：";
  156.             // 
  157.             // groupBox2
  158.             // 
  159.             groupBox2.Controls.Add(button3);
  160.             groupBox2.Controls.Add(comboBox1);
  161.             groupBox2.Controls.Add(label5);
  162.             groupBox2.Location = new Point(12, 175);
  163.             groupBox2.Name = "groupBox2";
  164.             groupBox2.Size = new Size(270, 54);
  165.             groupBox2.TabIndex = 1;
  166.             groupBox2.TabStop = false;
  167.             groupBox2.Text = "删除信息";
  168.             // 
  169.             // button3
  170.             // 
  171.             button3.Location = new Point(187, 24);
  172.             button3.Name = "button3";
  173.             button3.Size = new Size(75, 23);
  174.             button3.TabIndex = 2;
  175.             button3.Text = "删除";
  176.             button3.UseVisualStyleBackColor = true;
  177.             button3.Click += Button3_Click;
  178.             // 
  179.             // comboBox1
  180.             // 
  181.             comboBox1.FormattingEnabled = true;
  182.             comboBox1.Location = new Point(72, 24);
  183.             comboBox1.Name = "comboBox1";
  184.             comboBox1.Size = new Size(100, 25);
  185.             comboBox1.TabIndex = 1;
  186.             // 
  187.             // label5
  188.             // 
  189.             label5.AutoSize = true;
  190.             label5.Location = new Point(11, 30);
  191.             label5.Name = "label5";
  192.             label5.Size = new Size(44, 17);
  193.             label5.TabIndex = 0;
  194.             label5.Text = "编号：";
  195.             // 
  196.             // Frm_Child
  197.             // 
  198.             AutoScaleDimensions = new SizeF(7F, 17F);
  199.             AutoScaleMode = AutoScaleMode.Font;
  200.             ClientSize = new Size(294, 241);
  201.             Controls.Add(groupBox2);
  202.             Controls.Add(groupBox1);
  203.             MaximizeBox = false;    //最大化按钮没有意义
  204.             Name = "Frm_Child";
  205.             StartPosition = FormStartPosition.CenterScreen;
  206.             Text = "子窗体";
  207.             FormClosing += Frm_Child_FormClosing;
  208.             Load += Frm_Child_Load;
  209.             groupBox1.ResumeLayout(false);
  210.             groupBox1.PerformLayout();
  211.             groupBox2.ResumeLayout(false);
  212.             groupBox2.PerformLayout();
  213.             ResumeLayout(false);
  214.         }
  215.  
  216.         #endregion
  217.  
  218.         private GroupBox groupBox1;
  219.         private TextBox Record_Address;
  220.         private TextBox Record_Phone;
  221.         private TextBox Record_Name;
  222.         private TextBox Record_ID;
  223.         private Label label4;
  224.         private Label label3;
  225.         private Label label2;
  226.         private Label label1;
  227.         private GroupBox groupBox2;
  228.         private Button button2;
  229.         private Button button1;
  230.         private Button button3;
  231.         private ComboBox comboBox1;
  232.         private Label label5;
  233.     }
  234. }

（2）Frm_Child.cs

  1. // 本实例仅可创建一个窗口:
  2. // 最大化后没有实际意义，因此关闭MaximizeBox属性值为False
  3. namespace _197
  4. {
  5.     public partial class Frm_Child : Form
  6.     {
  7.         #region 变量的声明
  8.         public event EventHandler? UpdateDataGridView = null;//定义一个处理更新DataGridView控件内容的方法
  9.         private static string? deleteID;        //定义一个表示删除数据编号的字符串
  10.         private static string? idContent;       //该变量用来存储数据编号
  11.         private static string? nameContent;     //该变量用来存储姓名
  12.         private static string? phoneContent;    //该变量用来存储电话
  13.         private static string? addressContent;  //该变量用来存储住址
  14.         private static bool globalFlag;         //该变量用来标识是否创建新的子窗体
  15.  
  16.         public static string? DeleteID { get => deleteID; set => deleteID = value; }
  17.         public static string? IdContent { get => idContent; set => idContent = value; }
  18.         public static string? NameContent { get => nameContent; set => nameContent = value; }
  19.         public static string? PhoneContent { get => phoneContent; set => phoneContent = value; }
  20.         public static string? AddressContent { get => addressContent; set => addressContent = value; }
  21.         public static bool GlobalFlag { get => globalFlag; set => globalFlag = value; }
  22.         #endregion
  23.  
  24.         public Frm_Child()
  25.         {
  26.             InitializeComponent();
  27.         }
  28.         /// <summary>
  29.         /// 添加
  30.         /// </summary>
  31.         private void Button1_Click(object? sender, EventArgs e)
  32.         {
  33.             GlobalFlag = true;                          //设定标识的值为true
  34.             if (!(comboBox1.Items.Equals(idContent)))   //当Combobox控件中不存在将添加的信息时
  35.             {
  36.                 comboBox1.Items.Add(idContent!);        //在Combobox控件中添加一条记录
  37.             }
  38.             UpdateData();
  39.         }
  40.         /// <summary>
  41.         /// 清空
  42.         /// </summary>
  43.         private void Button2_Click(object? sender, EventArgs e)
  44.         {
  45.             Record_ID.Clear();      //清空编号文本框中的内容
  46.             Record_Name.Clear();    //清空姓名文本框中的内容
  47.             Record_Phone.Clear();   //清空电话号码文本框中的内容
  48.             Record_Address.Clear(); //清空居住地址文本框中的内容
  49.             Record_ID.Focus();      //设定当前鼠标的焦点在编号文本框中
  50.         }
  51.         /// <summary>
  52.         /// 删除
  53.         /// </summary>
  54.         private void Button3_Click(object? sender, EventArgs e)
  55.         {
  56.             GlobalFlag = false;             //设定全局变量表示为false
  57.             if (comboBox1.Items.Count > 1)  //当ComboBox中剩不小于2条内容时
  58.             {
  59.                 DeleteID = comboBox1.SelectedItem!.ToString();  //将选中项转化为int型
  60.                 if (comboBox1.Items.Count != 0)                 //当ComboBox中剩1条内容时
  61.                 {
  62.                     comboBox1.Items.Remove(comboBox1.SelectedItem);
  63.                     comboBox1.SelectedIndex = 0;
  64.                 }
  65.             }
  66.             UpdateData(); 
  67.         }
  68.         /// <summary>
  69.         /// 保存新添加记录的编号
  70.         /// </summary>
  71.         private void Record_ID_TextChanged(object? sender, EventArgs e)
  72.         {
  73.             idContent = Record_ID.Text;
  74.         }
  75.         /// <summary>
  76.         /// 保存填入的姓名
  77.         /// </summary>
  78.         private void Record_Name_TextChanged(object? sender, EventArgs e)
  79.         {
  80.             nameContent = Record_Name.Text;
  81.         }
  82.         /// <summary>
  83.         /// 保存填入的电话号码
  84.         /// </summary>
  85.         private void Record_Phone_TextChanged(object? sender, EventArgs e)
  86.         {
  87.             phoneContent = Record_Phone.Text;
  88.         }
  89.         /// <summary>
  90.         /// 保存填入的地址信息
  91.         /// </summary>
  92.         private void Record_Address_TextChanged(object? sender, EventArgs e)
  93.         {
  94.             addressContent = Record_Address.Text;
  95.         }
  96.         /// <summary>
  97.         /// 循环遍历数组中的每一个元素,向Combobox控件中添加内容
  98.         /// 默认设定当前选中项的索引为0
  99.         /// </summary>
  100.         private void Frm_Child_Load(object? sender, EventArgs e)
  101.         {
  102.             for (int i = 0; i < Frm_Main.IDArray!.Length; i++)
  103.             {
  104.                 comboBox1.Items.Add(Frm_Main.IDArray[i].ToString());
  105.                 comboBox1.SelectedIndex = 0;
  106.             }
  107.         }
  108.         /// <summary>
  109.         /// 设定该值为false表示可以创建新窗体
  110.         /// </summary>
  111.         private void Frm_Child_FormClosing(object? sender, FormClosingEventArgs e)
  112.         {
  113.             Frm_Main.Flag = false; 
  114.         }
  115.        
  116.         /// <summary>
  117.         /// 更新DataGridView控件中的内容
  118.         /// </summary>
  119.         protected void UpdateData()
  120.         {
  121.             UpdateDataGridView?.Invoke(this, EventArgs.Empty);
  122.         }
  123.     }
  124. }

5.生成效果

（1）生成

 

（2）添加

 

（3）添加后

 

（4）清空

 

声明：本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：https://www.wpsshop.cn/w/小蓝xlanll/article/detail/690601
推荐阅读
相关标签

Copyright © 2003-2013 www.wpsshop.cn 版权所有，并保留所有权利。

  

闽ICP备14008679号