C#笔记（1）窗体

1. 隐藏TabPage

在使用TabControl控件时，希望隐藏其中某个选项卡(即TabPage)。设置该TabPage的父容器为null 即可，如TabPage.Parent = null 。如需显示该TabPage，设置其父容器为对应的TabControl即可；

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 WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            tabPage3.Parent = null;//使tabPage3不可见

        }
        private void button1_Click(object sender, EventArgs e)
        {
            tabPage3.Parent = tabControl2;//使tabPage3可见
            tabPage1.Parent = null;//使tabPage1不可见
            tabControl2.SelectedTab = tabPage3;//停留在tabPage3
        }

    }
}

2. 鼠标右键菜单

1) 把ContextMenuStrip控件拖放到设计界面上(此处命名为cmMenu)。

2）右键cmMenu，点击Edit Items，添加菜单项，比如添加“打开”，“保存”等

3)  将想绑定控件(此处为Form)的ContextMenuStrip属性设置为设计的ContextMenuStrip(即cmMenu)。

运行：

3. 定时器

示例：用定时器每隔1s刷新数组，数字每次+1

代码：

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 WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public int number = 0;

        System.Timers.Timer timer;
        private void Form1_Load(object sender, EventArgs e)
        {
            timer = new System.Timers.Timer(1000);
            timer.Elapsed += new System.Timers.ElapsedEventHandler(changeNumber);
            timer.AutoReset = true;//AutoReset属性设置是否重复计时（设置为false只执行一次，设置为true可以多次执行）
            timer.Enabled = false;
        }
        private void changeNumber(object obj, EventArgs e)
        {
            number++;
            this.Invoke(new Action(delegate { this.textBox1.Text = number.ToString(); }));
        }

        private void toolStripMenuItem1_click(object sender, EventArgs e)
        {
            timer.Start();
        }
        private void toolStripMenuItem2_click(object sender, EventArgs e)
        {
            timer.Stop();
        }
    }
}

namespace WinFormsApp1
{
    partial class Form1
    {
        /// <summary>
        ///  Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        ///  Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        ///  Required method for Designer support - do not modify
        ///  the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.cmMenu = new System.Windows.Forms.ContextMenuStrip(this.components);
            this.toolStripMenuItem1 = new System.Windows.Forms.ToolStripMenuItem();
            this.toolStripMenuItem2 = new System.Windows.Forms.ToolStripMenuItem();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.cmMenu.SuspendLayout();
            this.SuspendLayout();
            //
            // cmMenu
            //
            this.cmMenu.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.toolStripMenuItem1,
            this.toolStripMenuItem2});
            this.cmMenu.Name = "contextMenuStrip1";
            this.cmMenu.Size = new System.Drawing.Size(101, 48);
            //
            // toolStripMenuItem1
            //
            this.toolStripMenuItem1.Name = "toolStripMenuItem1";
            this.toolStripMenuItem1.Size = new System.Drawing.Size(100, 22);
            this.toolStripMenuItem1.Text = "开始";
            this.toolStripMenuItem1.Click += new System.EventHandler(this.toolStripMenuItem1_click);
            //
            // toolStripMenuItem2
            //
            this.toolStripMenuItem2.Name = "toolStripMenuItem2";
            this.toolStripMenuItem2.Size = new System.Drawing.Size(100, 22);
            this.toolStripMenuItem2.Text = "停止";
            this.toolStripMenuItem2.Click += new System.EventHandler(this.toolStripMenuItem2_click);
            //
            // textBox1
            //
            this.textBox1.Location = new System.Drawing.Point(149, 74);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(161, 23);
            this.textBox1.TabIndex = 1;
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 17F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(800, 450);
            this.ContextMenuStrip = this.cmMenu;
            this.Controls.Add(this.textBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.cmMenu.ResumeLayout(false);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.ContextMenuStrip cmMenu;
        private System.Windows.Forms.ToolStripMenuItem toolStripMenuItem1;
        private System.Windows.Forms.ToolStripMenuItem toolStripMenuItem2;
        private System.Windows.Forms.TextBox textBox1;
    }
}