不错，不错，初学c#，转了~！
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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: emp est.txt FileStream fs = new FileStream(@c: emp est.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: emp est.txt FileStream fs = new FileStream(@c: emp est.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( {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: est.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: {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: est.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: est.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# %><script runat=server> void Button1_Click(Object sender, EventArgs e) { Label1.Text=TextBox1.Text; }
</script><html><head></head><body> <form runat=server> <p> <br /> Enter your name: <asp:TextBox id=TextBox1 runat=server></asp:TextBox> </p> <p> <b><asp:Label id=Label1 runat=server Width=247px></asp:Label></b> </p> <p> <asp:Button id=Button1 οnclick=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.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.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.butto, n1.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 formSystem.Drawing.Icon ico = new System.Drawing.Icon(@c: empapp.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.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(); }
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.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.; }}
当一个页面跳到此页面时，它就会记录跳到这个页面的ＵＲＬ，然后利用这个ＵＲＬ返回．小技巧，记录下来 1protected void Page_Load(object sender, EventArgs e) { ViewState["UrlReferrer"] = Request.UrlReferrer.ToString(); HyperLink1.NavigateUrl = (string)ViewState["UrlReferrer"]; Response.Write((string)ViewState["UrlReferrer"]);
本文来自博客，转载请标明出处：http://blog.csdn.net/tianhuo_soft/archive/2008/12/16/3528531.aspx
