C#入门代码集

一般的小东西：
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(,',',');
        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:\temp\test.txt
        FileStream fs = new FileStream(@"c:\temp\test.txt" , FileMode.Open, FileAccess.Read,',',');
        StreamReader sr = new StreamReader(fs,',',');

        String line=sr.ReadLine(,',',');
        while (line!=null)
        {
            Console.WriteLine(line,',',');
            line=sr.ReadLine(,',',');
        }

        sr.Close(,',',');
        fs.Close(,',',');
    }
}
三、写文件代码：
using System;
using System.IO;

public class TestWriteFile
{
    public static void Main(String[] args)
    {
        // Create a text file C:\temp\test.txt
        FileStream fs = new FileStream(@"c:\temp\test.txt" , FileMode.OpenOrCreate, FileAccess.Write,',',');
        StreamWriter sw = new StreamWriter(fs,',',');
        // Write to the file using StreamWriter class
        sw.BaseStream.Seek(0, SeekOrigin.End,',',');
        sw.WriteLine(" First Line ",',',');
        sw.WriteLine(" Second Line",',',');
        sw.Flush(,',',');
    }
}
四、拷贝文件：
using System;
using System.IO;

class TestCopyFile
{
    public static void Main()
    {
        File.Copy("c:\\temp\\source.txt", "C:\\temp\\dest.txt" ,',',');
    }
}
五、移动文件：
using System;
using System.IO;

class TestMoveFile
{
    public static void Main()
    {
        File.Move("c:\\temp\\abc.txt", "C:\\temp\\def.txt" ,',',');
    }
}
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 ,',',');
        timer.Interval = 1000;
        timer.Start(,',',');
        timer.Enabled = true;

while ( Console.Read() != 'q' )
{

}
}

    public static void DisplayTimeEvent( object source, ElapsedEventArgs e )
    {
        Console.Write("\r{0}", 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;
using 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" ;

        OleDbConnection conn = new OleDbConnection(strDSN,',',');
        OleDbCommand cmd = new OleDbCommand( strSQL, conn ,',',');
        OleDbDataReader reader = null;
        try
        {
            conn.Open(,',',');
            reader = cmd.ExecuteReader(,',',');
            while (reader.Read() )
            {
                Console.WriteLine("First Name:{0}, Last Name:{1}", reader["FirstName"], reader["LastName"],',',');
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message,',',');
        }
        finally
        {
            conn.Close(,',',');
        }
    }
}
九、连接SQL Server数据库：
using System;
using System.Data.SqlClient;

public class TestADO
{
    public static void Main()
    {
        SqlConnection conn = new SqlConnection("Data Source=localhost; Integrated Security=SSPI; Initial Catalog=pubs",',',');
        SqlCommand cmd = new SqlCommand("SELECT * FROM employees", conn,',',');
        try
        {
            conn.Open(,',',');

            SqlDataReader reader = cmd.ExecuteReader(,',',');
            while (reader.Read())
            {
                Console.WriteLine("First Name: {0}, Last Name: {1}", reader.GetString(0), reader.GetString(1),',',');
            }

            reader.Close(,',',');
            conn.Close(,',',');
        }
        catch(Exception e)
        {
            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.SqlClient;
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=;database=db",',',');

String strSql = "SELECT FirstName, LastName FROM employees";

SqlDataAdapter adapter = new SqlDataAdapter(,',',');

adapter.SelectCommand = new SqlCommand(strSql,conn,',',');

// Build the DataSet
DataSet ds = new DataSet(,',',');

adapter.Fill(ds, "employees",',',');

// Get a FileStream object
FileStream fs = new FileStream(strFileName,FileMode.OpenOrCreate,FileAccess.Write,',',');

// Apply the WriteXml method to write an XML document
ds.WriteXml(fs,',',');

fs.Close(,',',');

    }
}
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=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb";
        string strSQL = "INSERT INTO Employee(FirstName, LastName) VALUES('FirstName', 'LastName')" ;

        // create Objects of ADOConnection and ADOCommand
        OleDbConnection conn = new OleDbConnection(strDSN,',',');
        OleDbCommand cmd = new OleDbCommand( strSQL, conn ,',',');
        try
        {
            conn.Open(,',',');
            cmd.ExecuteNonQuery(,',',');
        }
        catch (Exception e)
        {
            Console.WriteLine("Oooops. I did it again:\n{0}", e.Message,',',');
        }
        finally
        {
            conn.Close(,',',');
        }
    }
}
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)
    {
        string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb";
        string strSQL = "SELECT * FROM employee" ;

OleDbConnection conn = new OleDbConnection(strDSN,',',');
OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn ,',',');

        conn.Open(,',',');
        DataSet ds = new DataSet(,',',');
        cmd.Fill( ds, "employee" ,',',');
        DataTable dt = ds.Tables[0];

        foreach( DataRow dr in dt.Rows )
        {
            Console.WriteLine("First name: "+ dr["FirstName"].ToString() + " Last name: "+ dr["LastName"].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(string[] args)
    {
        string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb";
        string strSQL = "SELECT * FROM employee" ;

OleDbConnection conn = new OleDbConnection(strDSN,',',');
OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn ,',',');

        conn.Open(,',',');
        DataSet ds = new DataSet(,',',');
        cmd.Fill( ds, "employee" ,',',');
        DataTable dt = ds.Tables[0];

        Console.WriteLine("Field Name DataType Unique AutoIncrement AllowNull",',',');
        Console.WriteLine("==================================================================",',',');
        foreach( DataColumn dc in dt.Columns )
        {
            Console.WriteLine(dc.ColumnName+" , "+dc.DataType +" ,"+dc.Unique +" ,"+dc.AutoIncrement+" ,"+dc.AllowDBNull ,',',');
        }
        conn.Close(,',',');
    }
}
ASP.NET方面的
十四、一个ASP.NET程序：
<%@ Page Language="C#" %>

public class SimpleForm : System.Windows.Forms.Form
{

    private System.ComponentModel.Container components = null;
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.TextBox textBox1;
    public SimpleForm()
    {
        InitializeComponent(,',',');
    }

    protected override void Dispose( bool disposing )
    {
        if( disposing )
        {
            if (components != null)
            {
                components.Dispose(,',',');
            }
        }
        base.Dispose( disposing ,',',');
    }

    #region Windows Form Designer generated code
    private void InitializeComponent()
    {

        this.components = new System.ComponentModel.Container(,',',');
        this.Size = new System.Drawing.Size(300,300,',',');
        this.Text = "Form1";

        this.button1 = new System.Windows.Forms.Button(,',',');
        this.textBox1 = new System.Windows.Forms.TextBox(,',',');
        this.SuspendLayout(,',',');
    //
    // button1
    //

    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";

    //
    // 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.TabIndex = 1;
    this.textBox1.Text = "textBox1";
    //
    // Form1
    //

    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13,',',');
    this.ClientSize = new System.Drawing.Size(292, 273,',',');
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
    this.textBox1,
    this.button1},',',');
    this.Name = "Form1";
    this.Text = "Form1";
    this.ResumeLayout(false,',',');

}
#endregion

    [STAThread]
    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 form
System.Drawing.Icon ico = new System.Drawing.Icon(@"c:\temp\app.ico",',',');
this.Icon = ico;
十七、添加组件到ListBox中：
private 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.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 ("localhost",',',');
         IPAddress [] IpAddr = ipEntry.AddressList;
         for (int i = 0; i < IpAddr.Length; i++)
         {
             Console.WriteLine ("IP Address {0}: {1} ", i, IpAddr[i].ToString (),',',');
         }
    }
}
十九、取得机器名称：
using System;
using System.Net;

class GetIP
{
    public static void Main()
    {
          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
        {
            // Construct a new mail message
            MailMessage message = new MailMessage(,',',');
            message.From = "from@domain.com";
            message.To   = "pengyun@cobainsoft.com";
            message.Cc   = "";
            message.Bcc = "";
            message.Subject = "Subject";
            message.Body = "Content of message";

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

            // Send the message
            SmtpMail.Send(message,',',');
            System.Console.WriteLine("Message has been sent",',',');
        }

        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;

class ResolveIP
{
     public static void Main()
     {
         IPHostEntry ipEntry = Dns.Resolve("172.29.9.9",',',');
         Console.WriteLine ("Host name : {0}", ipEntry.HostName,',',');
     }
}
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.ComponentModel.Container components = null;

    public Form1()
    {
        InitializeComponent(,',',');
    }

    #region Windows Form Designer generated code
    private void InitializeComponent()
    {
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13,',',');
        this.ClientSize = new System.Drawing.Size(292, 273,',',');
        this.Name = "Form1";
        this.Text = "Form1";
        this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint,',',');
    }
    #endregion

    [STAThread]
    static void Main()
    {
        Application.Run(new Form1(),',',');
    }

    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
        Graphics g=e.Graphics;
        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,',',');
    }
}
XML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",',',');
        reader.Read(,',',');

        while (reader.Read())
        {
            reader.MoveToElement(,',',');
            Console.WriteLine("XmlTextReader Properties Test",',',');
            Console.WriteLine("===================",',',');

            // Read this properties of element and display them on console
            Console.WriteLine("Name:" + reader.Name,',',');
            Console.WriteLine("Base URI:" + reader.BaseURI,',',');
            Console.WriteLine("Local Name:" + reader.LocalName,',',');
            Console.WriteLine("Attribute Count:" + reader.AttributeCount.ToString(),',',');
            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(),',',');
        }
    }
}
二十四、写XML文件：
using System;
using System.Xml;

public class TestWriteXMLFile
{
    public static int Main(string[] args)
    {
        try
        {
            // Creates an XML file is not exist
            XmlTextWriter writer = new XmlTextWriter("C:\\temp\\xmltest.xml", null,',',');
            // Starts a new document
            writer.WriteStartDocument(,',',');
            //Write comments
            writer.WriteComment("Commentss: XmlWriter Test Program",',',');
            writer.WriteProcessingInstruction("Instruction","Person Record",',',');
            // Add elements to the file
            writer.WriteStartElement("p", "person", "urn:person",',',');
            writer.WriteStartElement("LastName","",',',');
            writer.WriteString("Chand",',',');
            writer.WriteEndElement(,',',');
            writer.WriteStartElement("FirstName","",',',');
            writer.WriteString("Mahesh",',',');
            writer.WriteEndElement(,',',');
            writer.WriteElementInt16("age","", 25,',',');
            // Ends the document
            writer.WriteEndDocument(,',',');
        }
        catch (Exception e)
        {
            Console.WriteLine ("Exception: {0}", e.ToString(),',',');
        }
        return 0;
    }
}
Web Service方面的：
二十五、一个Web Service的小例子：
<% @WebService Language="C#" Class="TestWS" %>

using System.Web.Services;

public class TestWS : System.Web.Services.WebService
{
    [WebMethod()]
    public string StringFromWebService()
    {
        return "This is a string from web service.";
    }
}

C#入门代码集

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