C#入门代码,csharp参考模板

1、窗体顶端一、 从控制台读取东西代码片断：using System;class TestReadConsole    public static void Main()            Console.Write(Enter your name:);        string strName = Console.ReadLine();     

2、;   Console.WriteLine( Hi + strName);    二、读文件代码片断：using System; using System.IO; public class TestReadFile     public static void Main(String args)             / Read text file C:temptest.txt    

3、;     FileStream fs = new FileStream(c:temptest.txt , FileMode.Open, FileAccess.Read);         StreamReader sr = new StreamReader(fs);                  String line=sr.Rea

4、dLine();        while (line!=null)                    Console.WriteLine(line);            line=sr.ReadLine();  

5、;                         sr.Close();        fs.Close();    三、写文件代码：using System; using System.IO; public class TestWriteFile    

6、public static void Main(String args)             / Create a text file C:temptest.txt         FileStream fs = new FileStream(c:temptest.txt , FileMode.OpenOrCreate, FileAccess.Write);      &#

7、160;  StreamWriter sw = new StreamWriter(fs);         / Write to the file using StreamWriter class         sw.BaseStream.Seek(0, SeekOrigin.End);         sw.WriteLine( First Line );  &#

8、160;      sw.WriteLine( Second Line);         sw.Flush();     2 / 22四、拷贝文件：using System;using System.IO;class TestCopyFile    public static void Main()          

9、0; File.Copy(c:tempsource.txt, C:tempdest.txt );      五、移动文件：using System;using System.IO;class TestMoveFile    public static void Main()            File.Move(c:tempabc.txt, C:tempdef.txt );     

10、 六、使用计时器：using System;using System.Timers;class TestTimer    public static void Main()            Timer timer = new Timer();        timer.Elapsed += new ElapsedEventHandler( DisplayTimeEvent ); &

11、#160;      timer.Interval = 1000;        timer.Start();        timer.Enabled = true;        while ( Console.Read() != 'q' )      

12、60;              /-                public static void DisplayTimeEvent( object source, ElapsedEventArgs e )            Consol

13、e.Write(r0, DateTime.Now);    七、调用外部程序：class Test     static void Main(string args)             System.Diagnostics.Process.Start(notepad.exe);     ADO.NET方面的：八、连接Access数据库：using System;using System.Data;us

14、ing System.Data.OleDb;class TestADO    static void Main(string args)            string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:test.mdb;        string strSQL = SELECT * FROM employees

15、;        OleDbConnection conn = new OleDbConnection(strDSN);        OleDbCommand cmd = new OleDbCommand( strSQL, conn );        OleDbDataReader reader = null;      &

16、#160; try                    conn.Open();            reader = cmd.ExecuteReader();            while

17、(reader.Read() )                            Console.WriteLine(First Name:0, Last Name:1, readerFirstName, readerLastName);        

18、                    catch (Exception e)                    Console.WriteLine(e.Message);      &

19、#160;         finally                    conn.Close();            九、连接SQL Server数据库：using System;using System.Data.SqlClient;

20、public class TestADO    public static void Main()            SqlConnection conn = new SqlConnection(Data Source=localhost; Integrated Security=SSPI; Initial Catalog=pubs);        SqlCommand  cmd

21、= new SqlCommand(SELECT * FROM employees, conn);        try                            conn.Open();       

22、;     SqlDataReader reader = cmd.ExecuteReader();                        while (reader.Read()             

23、0;              Console.WriteLine(First Name: 0, Last Name: 1, reader.GetString(0), reader.GetString(1);                       

24、60;        reader.Close();            conn.Close();                catch(Exception e)          

25、          Console.WriteLine(Exception Occured ->> 0,e);                    十、从SQL内读数据到XML：using System;using System.Data;using System.Xml;using System.Data.SqlClien

26、t; using System.IO; public class TestWriteXML     public static void Main()            String strFileName=c:/temp/output.xml;        SqlConnection conn = new SqlConnection(server=localhost;uid=sa;pwd=

27、;database=db);        String strSql = SELECT FirstName, LastName FROM employees;         SqlDataAdapter adapter = new SqlDataAdapter();         adapter.SelectCommand = new SqlCommand(strSql,conn)

28、;        / Build the DataSet        DataSet ds = new DataSet();        adapter.Fill(ds, employees);        / Get a FileStream object    

29、0;   FileStream fs = new FileStream(strFileName,FileMode.OpenOrCreate,FileAccess.Write);        / Apply the WriteXml method to write an XML document        ds.WriteXml(fs);        fs.Cl

30、ose();    十一、用ADO添加数据到数据库中：using System;using System.Data;   using System.Data.OleDb;   class TestADO      static void Main(string args)                string strDSN = Provider=Microsof

31、t.Jet.OLEDB.4.0;DataSource=c:test.mdb;          string strSQL = INSERT INTO Employee(FirstName, LastName) VALUES('FirstName', 'LastName') ;                  &#

32、160;          / create Objects of ADOConnection and ADOCommand           OleDbConnection conn = new OleDbConnection(strDSN);          OleDbCommand cmd = new OleDbCommand( strS

33、QL, conn );          try                        conn.Open();              cmd.ExecuteNonQuery();

34、0;                   catch (Exception e)                        Console.WriteLine(Oooops. I did it again:n0, e.Message); 

35、;                   finally                        conn.Close();            

36、;              十二、使用OLEConn连接数据库：using System;using System.Data;   using System.Data.OleDb;   class TestADO      static void Main(string args)             

37、   string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:test.mdb;          string strSQL = SELECT * FROM employee ;          OleDbConnection conn = new OleDbConnection(strDSN);    &

38、#160;   OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn );         conn.Open();        DataSet ds = new DataSet();        cmd.Fill( ds, employee );    

39、0;   DataTable dt = ds.Tables0;        foreach( DataRow dr in dt.Rows )                    Console.WriteLine(First name: + drFirstName.ToString() + Last name: + drLa

40、stName.ToString();                conn.Close();        十三、读取表的属性：using System;using System.Data;   using System.Data.OleDb;   class TestADO      static void Main(str

41、ing args)                string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:test.mdb;          string strSQL = SELECT * FROM employee ;          OleD

42、bConnection conn = new OleDbConnection(strDSN);        OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn );         conn.Open();        DataSet ds = new DataSet();    

43、    cmd.Fill( ds, employee );        DataTable dt = ds.Tables0;        Console.WriteLine(Field Name DataType Unique AutoIncrement AllowNull);        Console.WriteLine(=); 

44、0;      foreach( DataColumn dc in dt.Columns )                    Console.WriteLine(dc.ColumnName+ , +dc.DataType + ,+dc.Unique + ,+dc.AutoIncrement+ ,+dc.AllowDBNull );  

45、0;             conn.Close();      ASP.NET方面的十四、一个ASP.NET程序：<% Page Language=C# %><script runat=server>       void Button1_Click(Object sender, EventArgs e)       &

46、#160;     Label1.Text=TextBox1.Text;    </script><html><head></head><body>    <form runat=server>        <p>           

47、; <br />            Enter your name: <asp:TextBox id=TextBox1 runat=server></asp:TextBox>        </p>        <p>     

48、60;      <b><asp:Label id=Label1 runat=server Width=247px></asp:Label></b>        </p>        <p>            <a

49、sp:Button id=Button1 onclick=Button1_Click runat=server Text=Submit></asp:Button>        </p>    </form></body></html>WinForm开发：十五、一个简单的WinForm程序：using System;using System.Drawing;using System.Collections;using System

50、.ComponentModel;using System.Windows.Forms;using System.Data;public class SimpleForm : System.Windows.Forms.Form    private System.ComponentModel.Container components = null;    private System.Windows.Forms.Button button1;    private System.Windows.Forms.

51、TextBox textBox1;    public SimpleForm()            InitializeComponent();        protected override void Dispose( bool disposing )            if( disposin

52、g )                    if (components != null)                            compon

53、ents.Dispose();                            base.Dispose( disposing );        #region Windows Form Designer generated code    priva

54、te void InitializeComponent()            ponents = new System.ComponentModel.Container();        this.Size = new System.Drawing.Size(300,300);        this.Text = Form1;  

55、      this.button1 = new System.Windows.Forms.Button();        this.textBox1 = new System.Windows.Forms.TextBox();        this.SuspendLayout();     /    / button1  &

56、#160; /    this.button1.Location = new System.Drawing.Point(8, 16);    this.button1.Name = button1;    this.button1.Size = new System.Drawing.Size(80, 24);    this.button1.TabIndex = 0;    this.button1.Text = button1; &#

57、160;  /    / textBox1    /    this.textBox1.Location = new System.Drawing.Point(112, 16);    this.textBox1.Name = textBox1;    this.textBox1.Size = new System.Drawing.Size(160, 20);    this.textBox1.TabInd

58、ex = 1;    this.textBox1.Text = textBox1;    /    / Form1    /    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);    this.ClientSize = new System.Drawing.Size(292, 273);    this.Controls

59、.AddRange(new System.Windows.Forms.Control     this.textBox1,    this.button1);    this.Name = Form1;    this.Text = Form1;    this.ResumeLayout(false);         #endregion    STATh

60、read    static void Main()            Application.Run(new SimpleForm();    十六、运行时显示自己定义的图标：/load icon and set to formSystem.Drawing.Icon ico = new System.Drawing.Icon(c:tempapp.ico);this.Icon = ico;十七、添加组件到ListBox中：priva

61、te void Form1_Load(object sender, System.EventArgs e)    string str = First item;    int i = 23;    float flt = 34.98f;     listBox1.Items.Add(str);    listBox1.Items.Add(i.ToString();    listBox1.Items.Add(flt

62、.ToString();    listBox1.Items.Add(Last Item in the List Box); 网络方面的：十八、取得IP地址：using System;using System.Net;class GetIP     public static void Main()              IPHostEntry ipEntry = Dns.GetHostByName (

63、localhost);         IPAddress IpAddr = ipEntry.AddressList;         for (int i = 0; i < IpAddr.Length; i+)                   &#

64、160;  Console.WriteLine (IP Address 0: 1 , i, IpAddr.ToString ();             十九、取得机器名称：using System;using System.Net;class GetIP    public static void Main()            

65、  Console.WriteLine (Host name : 0, Dns.GetHostName();    二十、发送邮件：using System;using System.Web;using System.Web.Mail;public class TestSendMail    public static void Main()            try    

66、0;               / Construct a new mail message             MailMessage message = new MailMessage();            message.From

67、= from;            message.To   =  pengyun;            message.Cc   = ;            message.Bcc  = ; 

68、           message.Subject = Subject;            message.Body = Content of message;                   

69、60;    /if you want attach file with this mail, add the line below            message.Attachments.Add(new MailAttachment(c:attach.txt, MailEncoding.Base64);             

70、/ Send the message            SmtpMail.Send(message);              System.Console.WriteLine(Message has been sent);            

71、60;   catch(Exception ex)                    System.Console.WriteLine(ex.Message.ToString();            二十一、根据IP地址得出机器名称：using System;using System.Net

72、;class ResolveIP     public static void Main()              IPHostEntry ipEntry = Dns.Resolve();         Console.WriteLine (Host name : 0, ipEntry.HostName);  &

73、#160;           GDI+方面的：二十二、GDI+入门介绍：using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;public class Form1 : System.Windows.Forms.Form    private System.Compon

74、entModel.Container components = null;    public Form1()            InitializeComponent();        protected override void Dispose( bool disposing )          

75、0; if( disposing )                    if (components != null)                          

76、60;  components.Dispose();                            base.Dispose( disposing );        #region Windows Form Designer generated code &#

77、160;  private void InitializeComponent()            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);        this.ClientSize = new System.Drawing.Size(292, 273);       

78、 this.Name = Form1;        this.Text = Form1;        this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);        #endregion    STAThread    static

79、void Main()             Application.Run(new Form1();        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)            Graphics g=e.Graphic

80、s;        g.DrawLine(new Pen(Color.Blue),10,10,210,110);        g.DrawRectangle(new Pen(Color.Red),10,10,200,100);        g.DrawEllipse(new Pen(Color.Yellow),10,150,200,100);    XM

81、L方面的：二十三、读取XML文件：using System;using System.Xml;  class TestReadXML    public static void Main()                    XmlTextReader reader  = new XmlTextReader(C:test.xml);   

82、60;    reader.Read();                while (reader.Read()                            

83、    reader.MoveToElement();            Console.WriteLine(XmlTextReader Properties Test);            Console.WriteLine(=);          

84、;    / Read this properties of element and display them on console            Console.WriteLine(Name: + reader.Name);            Console.WriteLine(Base URI: + reader.BaseURI);

85、            Console.WriteLine(Local Name: + reader.LocalName);            Console.WriteLine(Attribute Count: + reader.AttributeCount.ToString();       

86、0;    Console.WriteLine(Depth: + reader.Depth.ToString();            Console.WriteLine(Line Number: + reader.LineNumber.ToString();            Console.WriteLine(Node Type: + reader.NodeType.ToString();            Console.WriteLine(Attribute Count: + reader.Value.ToString();