form1.cs

java基础方面的一些实例代码

				MulQuery.Items.Add( "所有有课程冲突的学生");
				MulQuery.EndUpdate();
			}
			if (MulQuery.FindString(MulQuery.Text) < 0) 
			{
				MulQuery.BeginUpdate();
				MulQuery.Items.Add( MulQuery.Text);
				MulQuery.EndUpdate();
			}
			else 
				MessageBox.Show(MulQuery.Text+"已经存在");
		}

		// how to know which text you choice or edit
		private void button1_Click(object sender, System.EventArgs e)
		{
			int FindIndex;
			string strMsg = "目前你的选择是：";
			FindIndex = MulQuery.FindStringExact (MulQuery.Text );
			if (FindIndex < 0)
			{
				MulQuery.Items.Add (MulQuery.Text);
				strMsg += MulQuery.Text;
			}
			else 
			{
				strMsg += MulQuery.SelectedItem.ToString ();
			}
			
			MessageBox.Show (strMsg);
		}

		// Part 3:测试园按钮  如何知道单选一的按钮目前选中的是哪一个
		private void OledbB_CheckedChanged(object sender, System.EventArgs e)
		{
			if (OledbB.Checked) 
			{
				MessageBox.Show("你目前选中的是Oledb供应程序");
			}
		}

		private void SqlB_CheckedChanged(object sender, System.EventArgs e)
		{
			if (SqlB.Checked) 
			{
				MessageBox.Show("你目前选中的是Sql供应程序");
			}
		}

        //part 4: 测试checked按钮
		private void chkDisableMax_CheckedChanged(object sender, System.EventArgs e)
		{
			this.MaximizeBox = chkDisableMax.Checked ;
		}

		//在任务栏中显示，和NotifyIcon的作用矛盾
		private void chkDisableShow_CheckedChanged(object sender, System.EventArgs e)
		{
			this.ShowInTaskbar = chkDisableShow.Checked ;
		}

		// Part 5:  测试菜单
		//测试菜单项被选中
		private void menuItem2_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}

		// Part 6: 测试状态条，在鼠标移动时，将当前的鼠标位置显示在状态条中
		//同时测试Timertick，显示当前时间，并且用于测试进度条
		private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			string strCurrentPosition = "当前鼠标位置为：" + e.X.ToString() + "," + e.Y.ToString();
			statusBarPanel1.Text = strCurrentPosition;
		}

		//设置timer，第一用于测试状态条，每秒钟变换一次时间，显示在状态条中
		//第二，用于控制processBar的显示和速度控制
		private void timer1_Tick(object sender, System.EventArgs e)
		{
			//第一个用途：每秒钟变换一次时间，显示在状态条中
			statusBarPanel2.Text = DateTime.Now .ToString ();

			//第二个用途：控制和显示进度条的当前状态
			int nFinishedPercent;
			if ( progressBar1.Value == progressBar1.Maximum) 
			{
				progressBar1.Value = progressBar1.Minimum;
			}
			else
			{
				progressBar1.PerformStep( );
			}
			nFinishedPercent = 100 * ( progressBar1.Value - progressBar1.Minimum )
				/(progressBar1.Maximum - progressBar1.Minimum );
			MyProcessBarPersent.Text = Convert.ToInt16 (nFinishedPercent).ToString() + "%";

			//通过以下方式可以改变时间间隔量，目前的属性是每秒钟（1000ms）变化
			//timer1.Interval = Convert.ToInt16 (1000 / SpeedYouSelected) 
		}

		//测试进度条时的附带动作，单击在停止和启动时间timer1之间变换
		private void StopProcessBar_Click(object sender, System.EventArgs e)
		{
			if (timer1.Enabled == true)
			{
				timer1.Enabled = false;
				StopProcessBar.Text = "开始";
			}
			else 
			{
				timer1.Enabled = true;
				StopProcessBar.Text = "停止";
			}
		}

		// Part 7: 测试工具条， 按下工具条按钮，效果等同于选择对应菜单项
		//同时测试imagelist的使用方法
		private void toolBar1_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
		{
			//if (e.Button.Equals((object)toolBarFileExit))
				//this.menuItem2_Click(sender, e);
			switch (e.Button .ImageIndex ) 
			{
				case 0:
					this.Close();
				break;
			}
		}

		// part 8: 测试linkedLabel

		private void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
		{
			System.Diagnostics.Process.Start(linkLabel1.Text.Substring(2,16));
			//MessageBox.Show("You'd like to email to: "+linkLabel1.Text.Substring(2,16));			
			//linkLabel1.Links.Add(2, 15, "www.tsinghua.edu.cn");	
			//MessageBox.Show(e.Link.LinkData.ToString());
			linkLabel1.LinkVisited  = true;
			//System.Diagnostics.Process.Start(e.Link.LinkData.ToString());
			//System.Diagnostics.Process.Start("www.tsinghua.edu.cn");
		}

		// Part 9：测试CheckedListBox，注意与一般ListBox的区别--同时选中多项
		//添加一项到CheckedListBox中
		private void button4_Click(object sender, System.EventArgs e)
		{
			if(textBox2.Text.Trim()!="")
			{
				if (checkedListBox1.FindString(textBox2.Text) < 0) 
				{
					checkedListBox1.Items.Add(textBox2.Text);
					textBox2.Text = "";
				}
				else
					MessageBox.Show(textBox2.Text+"已经存在");
			}
			else
			{
				MessageBox.Show("你什么也不输入，我怎么添加啊?\n请在左面的文本框中输入一个字符串！");
			}		
		}

		//显示你目前所选中--不仅仅是所选择--的项目
		private void button6_Click(object sender, System.EventArgs e)
		{
			//string SelectedValues="目前你选中的值包括：\n";
			string SelectedValues = "";
			for(int i = 0; i < checkedListBox1.CheckedItems.Count; i++)
			{
				SelectedValues += checkedListBox1.CheckedItems[i].ToString() + "\n";
			}
			if (SelectedValues.Trim( ) != "") 
			{
				SelectedValues = "目前你选中的值包括：\n" + SelectedValues;
				MessageBox.Show(SelectedValues);
			}
			else 
				MessageBox.Show("目前你什么也没有选中");
		}

		//从CheckedListBox中删除所选择而不是选中的一项
		private void button5_Click(object sender, System.EventArgs e)
		{
			if (checkedListBox1.SelectedIndex < 0)
				MessageBox.Show("目前你什么也没有选则，我怎么删除啊?");
			else
				checkedListBox1.Items.RemoveAt(checkedListBox1.SelectedIndex);
		}

		// Part 10: 测试tabControl
		private void tabControl1_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (tabControl1.SelectedIndex == 0)
				MessageBox.Show("你现在查看的是我的属性");
			else 
				MessageBox.Show("你现在查看的是我的外观");
		}

		// Part 11：测试dateTimePicker的使用方法
		private void dateTimePicker1_ValueChanged(object sender, System.EventArgs e)
		{
			string strCurrentDay = "你现在选中" + dateTimePicker1.Text;
			//MessageBox.Show(strCurrentDay);
			groupBox6.Text = strCurrentDay;
		}

		// Part 12：测试pictureBox如何显示图片，顺带测试如何调用“打开文件”对话框
		//同时测试水平和垂直滚动条的用法，他们分别在水平和垂直方向上滚动所显示的图片
		private void pictureBox1_Click(object sender, System.EventArgs e)
		{
			//
			// 打开目录对话框，选中图片文件
			OpenFileDialog fodlg = new OpenFileDialog();
			fodlg.Title = "选择图片";
			fodlg.InitialDirectory = "";
			// 文件过滤类型
			fodlg.Filter = "All files (*.*)|*.*|Image files (*.jpg, *.bmp, *.gif)|*.jpg; *.bmp; *.gif" ; 
			// 缺省过滤文件类型
			fodlg.FilterIndex = 1 ; 
			if(fodlg.ShowDialog() == DialogResult.OK) 
			{ 
				pictureBox1.Image = Image.FromFile(fodlg.FileName) ; 
				//pictureBox1.Image.Size
				pictureBox1.Size = pictureBox1.Image.Size;
				hPictureScrollBar.Maximum  = pictureBox1.Width - panelPicture.Width + vPictureScrollBar.Width;
				vPictureScrollBar.Maximum  = pictureBox1.Height - panelPicture.Height + hPictureScrollBar.Height;
				pictureBox1.Left = pictureBox1.Top = 0;
				hPictureScrollBar.Value = vPictureScrollBar.Value = 0;
				hPictureScrollBar.Update();
			} 
		}

		//垂直方向上滚动显示图片
		private void vPictureScrollBar_Scroll(object sender, System.Windows.Forms.ScrollEventArgs e)
		{
			pictureBox1.Top = 0 - vPictureScrollBar.Value;
		}

		//水平方向上滚动显示图片
		private void hPictureScrollBar_Scroll(object sender, System.Windows.Forms.ScrollEventArgs e)
		{
			pictureBox1.Left = 0 - hPictureScrollBar.Value;
		}

		// Part 13: 测试TRackBar，同时测试ScrollBar
		private void trackBar1_Scroll(object sender, System.EventArgs e)
		{
			//hScrollBar1.Maximum = trackBar1.Maximum;
			//hScrollBar1.Value = trackBar1.Value;
			hScrollBar1.Value = trackBar1.Value*10;			
		}

		//Part 14: 测试TreeView，如何知道目前的选择

		private void treeView1_DoubleClick(object sender, System.EventArgs e)
		{
			treeView1.ExpandAll();
		}

		private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
		{
			MessageBox.Show("目前你的选择是：" + treeView1.SelectedNode.ToString ());
		}

		//Part 15:  测试NotifyIcon, 其作用是在任务栏中显示一个图标，表示目前的应用
		private void notifyIcon1_DoubleClick(object sender, System.EventArgs e)
		{
			if (this.Visible )
			{
				this.Hide();
			}
			else 
			{
				this.Show();
			}
		}

		//Part 16: 测试各种系统定义的对话框，并显示用户的选择
		//1：打开文件
		private void OpenLabel_Click(object sender, System.EventArgs e)
		{
			if ( MyOenFileDialog.ShowDialog () == DialogResult.OK )
			{
				ResultLabel.Text = "你选择打开的文件是\n" + MyOenFileDialog.FileName ;
			}
		}

		//2：保存文件
		private void SaveLabel_Click(object sender, System.EventArgs e)
		{
			MySaveFileDialog.Filter = this.MyOenFileDialog .Filter;
			MySaveFileDialog.CreatePrompt = true;
			MySaveFileDialog.OverwritePrompt = true;
			MySaveFileDialog.RestoreDirectory = true;

			if (MySaveFileDialog.ShowDialog () == DialogResult.OK) 
			{
				ResultLabel.Text = "你要保存的文件为\n" + MySaveFileDialog.FileName ;
			}
		}

		//3：浏览文件夹
		private void BrowseLabel_Click(object sender, System.EventArgs e)
		{
			if (MyFolderBrowserDialog.ShowDialog() == DialogResult.OK)
			{
				ResultLabel.Text = "你的选择是：" + MyFolderBrowserDialog.SelectedPath;
			}
		}

		//4：字体对话框
		private void FontLabel_Click(object sender, System.EventArgs e)
		{
			MyFontDialog.Font = ResultLabel.Font;
			MyFontDialog.ShowApply = true;
			MyFontDialog.ShowEffects = true;
	
			if (MyFontDialog.ShowDialog () == DialogResult.OK )
			{
				ResultLabel.Font = MyFontDialog.Font ;
			}
		}

		//5：颜色选择对话框
		private void ColorLabel_Click(object sender, System.EventArgs e)
		{
			if (MyColorDialog.ShowDialog () == DialogResult.OK )
			{
				ResultLabel.BackColor = MyColorDialog.Color ;
			}
		}

		//6：打印对话框，没有MyPageSetupDialog.Document之类的对象，不能打开
		private void PrintLabel_Click(object sender, System.EventArgs e)
		{
			MyPrintDialog.Document =  MyPrintDocument;
			if (MyPrintDialog.ShowDialog () == DialogResult.OK )
			{
				ResultLabel.Text = "你选择的打印机是：" + MyPrintDialog.PrinterSettings.PrinterName;				
			}
		}

		//7：页面设置对话框，没有MyPageSetupDialog.Document之类的对象，不能打开
		private void SetupLabel_Click(object sender, System.EventArgs e)
		{
			MyPageSetupDialog.Document = MyPrintDocument;
			//MyPageSetupDialog.PageSettings.PaperSize = 
			
			if (MyPageSetupDialog.ShowDialog() == DialogResult.OK )
			{
				ResultLabel.Text = "你选择的纸型为：" + MyPageSetupDialog.PageSettings.PaperSize.ToString();
			}
		}

		//8：打印预览对话框，有PrintPreviewDialog.Document，则显示空文档，否则，
		//报告目前没有任何文档可以预览
		private void PrintViewLabel_Click(object sender, System.EventArgs e)
		{
			MyPrintPreviewDialog.Document = MyPrintDocument;
			MyPrintPreviewDialog.ShowDialog();
		}

	}
}