1.数据结构

1.Dictionary的基本用法

 Dictionary<int, string> dict = newDictionary<int, string>();
 dict.Add(1, "111");
 dict.Add(2, "222");
 //删除键为“C”的元素
 dict.Remove("C");
 //判断是否存在相应的key并显示  
 if(dict.ContainsKey(2))
 {
     Console.WriteLine(dict[2]);
 }
 //遍历Keys  
 foreach(var item indict.Keys)
 {
     Console.WriteLine("Key:{0}", item);
 }
 //遍历Values  
     foreach(var item indict.Values)
 {
     Console.WriteLine("value:{0}", item);
 }
 //遍历整个字典  
 foreach(var item indict)
 {
     Console.WriteLine("key:{0} value:{1}", item.Key, item.Value);
 }
 

2. 基础操作

1 string类型转换成double

 string numStr = "33.44";
 double numDouble1 = double.Parse(numStr);
 double numDouble2 =Convert.ToDouble(numStr);

2 获取当前路径7种方法 (opens new window)

 //获取模块的完整路径。
 string path1 = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName;
 //获取和设置当前目录(该进程从中启动的目录)的完全限定目录
 string path2 = System.Environment.CurrentDirectory;
 //获取应用程序的当前工作目录
 string path3 = System.IO.Directory.GetCurrentDirectory();
 //获取程序的基目录
 string path4 = System.AppDomain.CurrentDomain.BaseDirectory;
 //获取和设置包括该应用程序的目录的名称
 string path5 = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
 //获取启动了应用程序的可执行文件的路径
 string path6 = System.Windows.Forms.Application.StartupPath;
 //获取启动了应用程序的可执行文件的路径及文件名
 string path7 = System.Windows.Forms.Application.ExecutablePath;

3 double 保留小数点后几位

 Double value = Math.Round(value,4); // 简单实用★★★★
 
 
 Double salary1 = 10000.0;
 Double salary2 = 10000.12345;
 Double salary3 = 10000.1289;
 Int salary4 = 10000;
 string salary5 = "10000";
 string salary6 = "10000.12345";
 string salary7 = "10000.1289"
 
 Convert.ToDouble(salary1).ToString("0.00");//保留小数点后两位,结果为10000.00
 Convert.ToDouble(salary2).ToString("0.00");//保留小数点后两位,结果为10000.12
 Convert.ToDouble(salary3).ToString("0.00");//保留小数点后两位,结果为10000.13
 Convert.ToDouble(salary4).ToString("0.00");//保留小数点后两位,结果为10000.00
 Convert.ToDouble(salary5).ToString("0.00");//保留小数点后两位,结果为10000.00
 Convert.ToDouble(salary6).ToString("0.00");//保留小数点后两位,结果为10000.12
 Convert.ToDouble(salary7).ToString("0.00");//保留小数点后两位,结果为10000.13  

4 项目更换DLL

1. 在官网下载指定 .net 版本的 dll文件。这里以System.Data.SQLite.dll为例

网站如下:

http://system.data.sqlite.org/index.html/doc/trunk/www/downloads.wiki (opens new window)

2.放到指定工程的bin目录。比如这里的：

1. 在工程里面右键 remake

   

   3.各种控件

   1 openfiledialog

   属性：

   InitialDirectory 对话框的初始目录
   Filter 要在对话框中显示的文件筛选器，例如，"文本文件(*.txt)|*.txt|所有文件(*.*)||*.*"
   FilterIndex 在对话框中选择的文件筛选器的索引，如果选第一项就设为1
   RestoreDirectory 控制对话框在关闭之前是否恢复当前目录
   FileName 第一个在对话框中显示的文件或最后一个选取的文件
   Title 将显示在对话框标题栏中的字符
   AddExtension 是否自动添加默认扩展名
   CheckPathExists
   在对话框返回之前，检查指定路径是否存在
   DefaultExt 默认扩展名
   DereferenceLinks 在从对话框返回前是否取消引用快捷方式
   
   

   模板：

   private void openFileDialogBTN_Click(object sender, System.EventArgs e){
       OpenFileDialog openFileDialog = new OpenFileDialog();
       openFileDialog.InitialDirectory = "c:\\\\";//注意这里写路径时要用c:\\\\而不是c:\\
       openFileDialog.Filter = "文本文件|*.*|C#文件|*.cs|所有文件|*.*";
       openFileDialog.RestoreDirectory = true;
       openFileDialog.FilterIndex = 1;
       if (openFileDialog.ShowDialog()==DialogResult.OK) // 做一些操作
       {
           fName=openFileDialog.FileName;
           File fileOpen=new File(fName);
           isFileHaveName=true;
           richTextBox1.Text=fileOpen.ReadFile();
           richTextBox1.AppendText("");
       }
   }
   
   

   2.chart

   chart1.Series[0].ChartType = SeriesChartType.Line;   // 折线图
   chart1.Series[0].Color = Color.Red;                  // 折线颜色
   //chart1.Series[0].IsValueShownAsLabel = true;       // 显示每个点的数值
   //chart1.Series[0].MarkerColor = Color.Red;          // 每个点高亮
   //chart1.Series[0].MarkerStyle = MarkerStyle.Square; // 高亮形状
   
   chart1.Series.Clear();
   chart1.Titles.Clear();
   ChartArea area = chart1.ChartAreas[0];
   
   ChartHelper.SetStyle(chart1, Color.White, Color.Black);
   ChartHelper.SetLegend(chart1, Docking.Top, StringAlignment.Center, Color.Transparent, Color.Black);
   
   ChartHelper.SetMajorGrid(chart1, Color.Gray, 20, 2);
   
   area.AxisY.Title = "Amp";
   area.AxisY.TitleAlignment = StringAlignment.Far;
   area.AxisY.TitleForeColor = Color.Black;
   area.AxisY.LabelStyle = new LabelStyle() { ForeColor = Color.Black };
   area.AxisY.LineColor = Color.Black;
   area.AxisY.ArrowStyle = AxisArrowStyle.Triangle;
   area.AxisY.Interval = Convert.ToDouble(((showY.Max() - showY.Min()) / 6).ToString("0.00000")); 
   
   area.AxisX.Title = "time";
   area.AxisX.TitleAlignment = StringAlignment.Far;
   area.AxisX.TitleForeColor = Color.Black;
   area.AxisX.LabelStyle = new LabelStyle() { ForeColor = Color.Black };
   area.AxisX.LineColor = Color.Black;
   area.AxisX.ArrowStyle = AxisArrowStyle.Triangle; //SharpTriangle;
   
   area.AxisX.TitleAlignment = StringAlignment.Center;
   area.AxisX.MajorGrid.Enabled = true;
   area.AxisX.Interval = AxisXInterva;
   
   area.AxisX.ScrollBar.Size = 12;
   area.AxisX.ScrollBar.ButtonStyle = ScrollBarButtonStyles.SmallScroll;
   area.AxisX.ScrollBar.ButtonStyle =
       ScrollBarButtonStyles.All ^ ScrollBarButtonStyles.ResetZoom;
   area.AxisX.ScrollBar.IsPositionedInside = false;
   area.AxisX.ScrollBar.Enabled = true;
   area.AxisX.ScaleView.Size = ScaleViewSize;
   
   chart1.Series.Add("Current");
   // chart1.Series[0].ChartType = SeriesChartType.SplineRange;
   chart1.Series[0].ChartType = SeriesChartType.Line;
   chart1.Series[0].Color = Color.Red;
   //chart1.Series[0].IsValueShownAsLabel = true; // 显示每个点的数值
   //chart1.Series[0].MarkerColor = Color.Red;    // 每个点高亮
   //chart1.Series[0].MarkerStyle = MarkerStyle.Square;
   if (false) {
       chart1.Series[0].IsValueShownAsLabel = true;
       chart1.Series[0].MarkerStyle = MarkerStyle.Circle;
       chart1.Series[0].MarkerColor = Color.Red;
       chart1.Series[0].LabelForeColor = Color.Blue;
       chart1.Series[0].LabelAngle = -90;
   }
   
   chart1.Titles.Add($"time:{dateTimePicker2.Value.ToString()}     {comboBox2.SelectedItem} Current");
   chart1.Titles[0].Font = new Font("微软雅黑", 12);
   chart1.Titles[0].Docking = Docking.Bottom;
   chart1.Titles[0].ForeColor = Color.FromArgb(46, 199, 201);