天天向上

 1: public abstract class Poly

 2: {

 3: private int r = 0;

 4: public int R

 5: {

 6: get

 7: {

 8: return r;

 9: }

 10: set

 11: {

 12: r = value;

 13: }

 14: }

 15: public abstract double Area();

 16: }

 1: class test

 2: {

 3: public override string ToString()

 4: {

 5: return "c# 真好用";

 6: }

 7: }

 1: private void button1_Click(object sender, EventArgs e)

 2: {

 3: using (FileStream fs = new FileStream(@"c:\log.txt",System.IO.FileMode.Create))

 4: {

 5: object obj = fs as object;

 6: if (obj != null)

 7: {

 8: MessageBox.Show("轉換為Object成功！", "提示！");

 9: }

 10: else

 11: {

 12: MessageBox.Show("轉換為Object不成功！", "提示！");

 13: }

 14: Stream strm = obj as Stream;

 15: if (strm != null)

 16: {

 17: MessageBox.Show("轉換為Stream成功！", "提示！");

 18: }

 19: else

 20: {

 21: MessageBox.Show("轉換為Stream不成功！", "提示！");

 22: }

 23: string str = obj as string;

 24: if (str != null)

 25: {

 26: MessageBox.Show("轉換為string成功！", "提示！");

 27: }

 28: else

 29: {

 30: MessageBox.Show("轉換為string不成功！", "提示！");

 31: }

 32:  

 33: StreamReader f = obj as StreamReader;

 34: if (str != null)

 35: {

 36: MessageBox.Show("轉換為StreamReader成功！", "提示！");

 37: }

 38: else

 39: {

 40: MessageBox.Show("轉換為StreamReader不成功！", "提示！");

 41: }

 42:  

 43: }

 44: }

 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.Windows.Forms;

 9: using System;

 10: using System.Runtime.InteropServices;

 11:  

 12: namespace HideTaskBarEx

 13: {

 14:  

 15: public partial class Form1 : Form

 16: {

 17: [DllImport("user32.dll")]

 18: private static extern IntPtr FindWindow(String className, String windowText);

 19: [DllImport("user32.dll")]

 20: private static extern Int32 ShowWindow(IntPtr hwnd, Int32 command);

 21: private const Int32 HIDE = 0;

 22: private const Int32 SHOW = 1;

 23: public Form1()

 24: {

 25: InitializeComponent();

 26: }

 27:  

 28: private void button1_Click(object sender, EventArgs e)

 29: {

 30: IntPtr TaskBar = FindWindow("Shell_TrayWnd", "");

 31: ShowWindow(TaskBar, HIDE);

 32: }

 33:  

 34: private void button2_Click(object sender, System.EventArgs e)

 35: {

 36: IntPtr TaskBar = FindWindow("Shell_TrayWnd", "");

 37: ShowWindow(TaskBar, SHOW);

 38: }

 39: }

 40: }

 1: public partial class Form1 : Form

 2: {

 3: NotifyIcon notifyIcon;

 4:  

 5: private void Initial()

 6: {

 7: notifyIcon = new NotifyIcon();

 8: notifyIcon.BalloonTipText = "Program is Running..."; //設定通知欄提示的文字

 9: notifyIcon.Text = "NotifyIcon Sample"; //設定通知欄在滑鼠移至Icon上的要顯示的文字

 10: notifyIcon.Icon = (System.Drawing.Icon)Properties.Resources.forms; //決定一個Logo

 11: notifyIcon.Click += (sender, e) => //設定按下Icon的事件

 12: {

 13: notifyIcon.Visible = false;

 14: this.ShowInTaskbar = true;

 15: this.Show();

 16: };

 17:  

 18: //設定右鍵選單

 19: ContextMenu contextMenu = new ContextMenu();

 20: MenuItem menuItem = new MenuItem();

 21: menuItem.Checked = true;

 22: menuItem.Index = 1;

 23: menuItem.Text = "顯示";

 24: menuItem.Click += (sender, e) => //設定按下事件

 25: {

 26: MessageBox.Show("開始...");

 27: };

 28: contextMenu.MenuItems.Add(menuItem);

 29: notifyIcon.ContextMenu = contextMenu;

 30: }

 31: public Form1()

 32: {

 33: InitializeComponent();

 34: Initial();

 35: }

 36:  

 37: private void button1_Click(object sender, EventArgs e)

 38: {

 39: this.ShowInTaskbar = false;

 40: this.Hide();

 41: notifyIcon.Visible = true;

 42: notifyIcon.ShowBalloonTip(1, "測試", "測試內容", ToolTipIcon.Info);

 43: }

 44: }

 1: private void button1_Click(object sender, EventArgs e)

 2: {

 3: listBox1.Items.Clear();

 4: foreach (var screen in Screen.AllScreens)

 5: {

 6: listBox1.Items.Add("Device nAME: " + screen.DeviceName);

 7: listBox1.Items.Add("Bounds: " + screen.Bounds.ToString());

 8: listBox1.Items.Add("Type: " + screen.GetType().ToString());

 9: listBox1.Items.Add("Working Area: " + screen.WorkingArea.ToString());

 10: listBox1.Items.Add("Primary Screen: " + screen.Primary.ToString());

 11: listBox1.Items.Add("=================================================");

 12: }

 13: }