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【字号:大 小】
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一、从控制台读取东西代码片断:
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using System;
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class TestReadConsole
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{
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public static void Main()
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{
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Console.Write(Enter your name:);
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string strName = Console.ReadLine();
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Console.WriteLine( Hi + strName);
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}
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}
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二、读文件代码片断:
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using System;
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using System.IO;
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public class TestReadFile
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{
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public static void Main(String[] args)
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{
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// Read text file C:\temp\test.txt
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FileStream fs = new FileStream(@c:\temp\test.txt , FileMode.Open, FileAccess.Read);
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StreamReader sr = new StreamReader(fs);
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String line=sr.ReadLine();
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while (line!=null)
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{
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Console.WriteLine(line);
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line=sr.ReadLine();
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}
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sr.Close();
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fs.Close();
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}
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}
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三、写文件代码:
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using System;
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using System.IO;
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public class TestWriteFile
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{
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public static void Main(String[] args)
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{
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// Create a text file C:\temp\test.txt
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FileStream fs = new FileStream(@c:\temp\test.txt , FileMode.OpenOrCreate, FileAccess.Write);
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StreamWriter sw = new StreamWriter(fs);
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// Write to the file using StreamWriter class
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sw.BaseStream.Seek(0, SeekOrigin.End);
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sw.WriteLine( First Line );
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sw.WriteLine( Second Line);
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sw.Flush();
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}
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}
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四、拷贝文件:
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using System;
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using System.IO;
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class TestCopyFile
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{
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public static void Main()
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{
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File.Copy(c:\\temp\\source.txt, C:\\temp\\dest.txt );
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}
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}
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五、移动文件:
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using System;
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using System.IO;
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class TestMoveFile
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{
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public static void Main()
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{
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File.Move(c:\\temp\\abc.txt, C:\\temp\\def.txt );
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}
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}
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六、使用计时器:
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using System;
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using System.Timers;
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class TestTimer
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{
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public static void Main()
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{
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Timer timer = new Timer();
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timer.Elapsed += new ElapsedEventHandler( DisplayTimeEvent );
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timer.Interval = 1000;
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timer.Start();
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timer.Enabled = true;
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while ( Console.Read() != 'q' )
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{
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}
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}
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public static void DisplayTimeEvent( object source, ElapsedEventArgs e )
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{
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Console.Write(\r{0}, DateTime.Now);
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}
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}
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七、调用外部程序:
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class Test
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{
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static void Main(string[] args)
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{
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System.Diagnostics.Process.Start(notepad.exe);
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}
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}
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ADO.NET方面的:
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八、连接Access数据库:
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using System;
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using System.Data;
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using System.Data.OleDb;
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class TestADO
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{
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static void Main(string[] args)
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{
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string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\test.mdb;
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string strSQL = SELECT * FROM employees ;
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OleDbConnection conn = new OleDbConnection(strDSN);
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OleDbCommand cmd = new OleDbCommand( strSQL, conn );
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OleDbDataReader reader = null;
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try
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{
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conn.Open();
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reader = cmd.ExecuteReader();
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while (reader.Read() )
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{
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Console.WriteLine(First Name:{0}, Last Name:{1}, reader[FirstName], reader[LastName]);
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}
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}
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catch (Exception e)
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{
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Console.WriteLine(e.Message);
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}
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finally
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{
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conn.Close();
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}
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}
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}
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九、连接SQL Server数据库:
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using System;
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using System.Data.SqlClient;
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public class TestADO
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{
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public static void Main()
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{
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SqlConnection conn = new SqlConnection(Data Source=localhost; Integrated Security=SSPI; Initial Catalog=pubs);
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SqlCommand cmd = new SqlCommand(SELECT * FROM employees, conn);
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try
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{
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conn.Open();
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SqlDataReader reader = cmd.ExecuteReader();
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while (reader.Read())
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{
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Console.WriteLine(First Name: {0}, Last Name: {1}, reader.GetString(0), reader.GetString(1));
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}
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reader.Close();
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conn.Close();
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}
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catch(Exception e)
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{
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Console.WriteLine(Exception Occured -->> {0},e);
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}
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}
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}
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十、从SQL内读数据到XML:
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using System;
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using System.Data;
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using System.Xml;
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using System.Data.SqlClient;
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using System.IO;
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public class TestWriteXML
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{
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public static void Main()
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{
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String strFileName=c:/temp/output.xml;
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SqlConnection conn = new SqlConnection(server=localhost;uid=sa;pwd=;database=db);
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String strSql = SELECT FirstName, LastName FROM employees;
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SqlDataAdapter adapter = new SqlDataAdapter();
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adapter.SelectCommand = new SqlCommand(strSql,conn);
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// Build the DataSet
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DataSet ds = new DataSet();
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adapter.Fill(ds, employees);
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// Get a FileStream object
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FileStream fs = new FileStream(strFileName,FileMode.OpenOrCreate,FileAccess.Write);
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// Apply the WriteXml method to write an XML document
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ds.WriteXml(fs);
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fs.Close();
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}
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}
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十一、用ADO添加数据到数据库中:
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using System;
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using System.Data;
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using System.Data.OleDb;
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class TestADO
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{
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static void Main(string[] args)
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{
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string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb;
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string strSQL = INSERT INTO Employee(FirstName, LastName) VALUES('FirstName', 'LastName') ;
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// create Objects of ADOConnection and ADOCommand
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OleDbConnection conn = new OleDbConnection(strDSN);
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OleDbCommand cmd = new OleDbCommand( strSQL, conn );
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try
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{
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conn.Open();
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cmd.ExecuteNonQuery();
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}
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catch (Exception e)
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{
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Console.WriteLine(Oooops. I did it again:\n{0}, e.Message);
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}
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finally
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{
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conn.Close();
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}
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}
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}
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十二、使用OLEConn连接数据库:
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using System;
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using System.Data;
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using System.Data.OleDb;
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class TestADO
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{
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static void Main(string[] args)
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{
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string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb;
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string strSQL = SELECT * FROM employee ;
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OleDbConnection conn = new OleDbConnection(strDSN);
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OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn );
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conn.Open();
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DataSet ds = new DataSet();
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cmd.Fill( ds, employee );
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DataTable dt = ds.Tables[0];
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foreach( DataRow dr in dt.Rows )
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{
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Console.WriteLine(First name: + dr[FirstName].ToString() + Last name: + dr[LastName].ToString());
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}
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conn.Close();
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}
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}
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十三、读取表的属性:
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using System;
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using System.Data;
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using System.Data.OleDb;
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class TestADO
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{
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static void Main(string[] args)
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{
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string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb;
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string strSQL = SELECT * FROM employee ;
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OleDbConnection conn = new OleDbConnection(strDSN);
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OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn );
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conn.Open();
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DataSet ds = new DataSet();
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cmd.Fill( ds, employee );
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DataTable dt = ds.Tables[0];
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Console.WriteLine(Field Name DataType Unique AutoIncrement AllowNull);
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Console.WriteLine(==================================================================);
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foreach( DataColumn dc in dt.Columns )
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{
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Console.WriteLine(dc.ColumnName+ , +dc.DataType + ,+dc.Unique + ,+dc.AutoIncrement+ ,+dc.AllowDBNull );
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}
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conn.Close();
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}
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}
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ASP.NET方面的
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十四、一个ASP.NET程序:
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<%@ Page Language=C# %>
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<script runat=server>
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void Button1_Click(Object sender, EventArgs e)
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{
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Label1.Text=TextBox1.Text;
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}
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</script>
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<html>
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<head>
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</head>
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<body>
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<form runat=server>
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<p>
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<br />
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Enter your name: <asp:TextBox id=TextBox1 runat=server></asp:TextBox>
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</p>
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<p>
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<b><asp:Label id=Label1 runat=server Width=247px></asp:Label></b>
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</p>
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<p>
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<asp:Button id=Button1 onclick=Button1_Click runat=server Text=Submit></asp:Button>
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</p>
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</form>
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</body>
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</html>
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WinForm开发:
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十五、一个简单的WinForm程序:
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using System;
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using System.Drawing;
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using System.Collections;
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using System.ComponentModel;
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using System.Windows.Forms;
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using System.Data;
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public class SimpleForm : System.Windows.Forms.Form
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{
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private System.ComponentModel.Container components = null;
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private System.Windows.Forms.Button button1;
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private System.Windows.Forms.TextBox textBox1;
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public SimpleForm()
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{
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InitializeComponent();
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}
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protected override void Dispose( bool disposing )
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{
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if( disposing )
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{
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if (components != null)
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{
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components.Dispose();
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}
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}
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base.Dispose( disposing );
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}
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Windows Form Designer generated code
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[STAThread]
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static void Main()
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{
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Application.Run(new SimpleForm());
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}
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}
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十六、运行时显示自己定义的图标:
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//load icon and set to form
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System.Drawing.Icon ico = new System.Drawing.Icon(@c:\temp\app.ico);
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this.Icon = ico;
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十七、添加组件到ListBox中:
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private void Form1_Load(object sender, System.EventArgs e)
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{
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string str = First item;
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int i = 23;
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float flt = 34.98f;
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listBox1.Items.Add(str);
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listBox1.Items.Add(i.ToString());
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listBox1.Items.Add(flt.ToString());
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listBox1.Items.Add(Last Item in the List Box);
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}
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网络方面的:
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十八、取得IP地址:
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using System;
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using System.Net;
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class GetIP
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{
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public static void Main()
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{
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IPHostEntry ipEntry = Dns.GetHostByName (localhost);
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IPAddress [] IpAddr = ipEntry.AddressList;
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for (int i = 0; i < IpAddr.Length; i++)
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{
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Console.WriteLine (IP Address {0}: {1} , i, IpAddr.ToString ());
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}
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}
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}
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十九、取得机器名称:
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using System;
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using System.Net;
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class GetIP
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{
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public static void Main()
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{
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Console.WriteLine (Host name : {0}, Dns.GetHostName());
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}
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}
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二十、发送邮件:
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using System;
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using System.Web;
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using System.Web.Mail;
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public class TestSendMail
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{
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public static void Main()
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{
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try
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{
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// Construct a new mail message
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MailMessage message = new MailMessage();
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message.From = from@domain.com;
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message.To = pengyun@cobainsoft.com;
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message.Cc = ;
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message.Bcc = ;
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message.Subject = Subject;
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message.Body = Content of message;
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//if you want attach file with this mail, add the line below
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message.Attachments.Add(new MailAttachment(c:\\attach.txt, MailEncoding.Base64));
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// Send the message
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SmtpMail.Send(message);
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System.Console.WriteLine(Message has been sent);
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}
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catch(Exception ex)
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{
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System.Console.WriteLine(ex.Message.ToString());
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}
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}
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}
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二十一、根据IP地址得出机器名称:
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using System;
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using System.Net;
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class ResolveIP
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{
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public static void Main()
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{
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IPHostEntry ipEntry = Dns.Resolve(172.29.9.9);
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Console.WriteLine (Host name : {0}, ipEntry.HostName);
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}
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}
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GDI+方面的:
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二十二、GDI+入门介绍:
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using System;
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using System.Drawing;
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using System.Collections;
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using System.ComponentModel;
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using System.Windows.Forms;
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using System.Data;
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public class Form1 : System.Windows.Forms.Form
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{
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private System.ComponentModel.Container components = null;
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public Form1()
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{
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InitializeComponent();
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}
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protected override void Dispose( bool disposing )
525
{
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if( disposing )
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{
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if (components != null)
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{
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components.Dispose();
531
}
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}
533
base.Dispose( disposing );
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}
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Windows Form Designer generated code
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[STAThread]
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static void Main()
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{
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Application.Run(new Form1());
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}
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private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
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{
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Graphics g=e.Graphics;
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g.DrawLine(new Pen(Color.Blue),10,10,210,110);
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g.DrawRectangle(new Pen(Color.Red),10,10,200,100);
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g.DrawEllipse(new Pen(Color.Yellow),10,150,200,100);
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}
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}
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XML方面的:
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二十三、读取XML文件:
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using System;
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using System.Xml;
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class TestReadXML
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{
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public static void Main()
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{
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XmlTextReader reader = new XmlTextReader(C:\\test.xml);
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reader.Read();
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while (reader.Read())
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{
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reader.MoveToElement();
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Console.WriteLine(XmlTextReader Properties Test);
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Console.WriteLine(===================);
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// Read this properties of element and display them on console
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Console.WriteLine(Name: + reader.Name);
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Console.WriteLine(Base URI: + reader.BaseURI);
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Console.WriteLine(Local Name: + reader.LocalName);
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Console.WriteLine(Attribute Count: + reader.AttributeCount.ToString());
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Console.WriteLine(Depth: + reader.Depth.ToString());
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Console.WriteLine(Line Number: + reader.LineNumber.ToString());
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Console.WriteLine(Node Type: + reader.NodeType.ToString());
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Console.WriteLine(Attribute Count: + reader.Value.ToString());
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}
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}
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}
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二十四、写XML文件:
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using System;
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using System.Xml;
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public class TestWriteXMLFile
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{
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public static int Main(string[] args)
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{
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try
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{
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// Creates an XML file is not exist
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XmlTextWriter writer = new XmlTextWriter(C:\\temp\\xmltest.xml, null);
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// Starts a new document
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writer.WriteStartDocument();
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//Write comments
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writer.WriteComment(Commentss: XmlWriter Test Program);
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writer.WriteProcessingInstruction(Instruction,Person Record);
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// Add elements to the file
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writer.WriteStartElement(p, person, urn:person);
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writer.WriteStartElement(LastName,);
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writer.WriteString(Chand);
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writer.WriteEndElement();
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writer.WriteStartElement(FirstName,);
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writer.WriteString(Mahesh);
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writer.WriteEndElement();
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writer.WriteElementInt16(age,, 25);
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// Ends the document
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writer.WriteEndDocument();
621
}
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catch (Exception e)
623
{
624
Console.WriteLine (Exception: {0}, e.ToString());
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}
626
return 0;
627
}
628
}
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630
Web Service方面的:
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二十五、一个Web Service的小例子:
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<% @WebService Language=C# Class=TestWS %>
633
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using System.Web.Services;
635
636
public class TestWS : System.Web.Services.WebService
637
{
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[WebMethod()]
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public string StringFromWebService()
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{
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return This is a string from web service.;
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}
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}
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