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1、如有侵权，请联系网站删除，仅供学习与交流C#入门代码您现在的位置正文C#入门代码新闻类别:网络编程 | 来源:百度 | 日期：2007-1-10 | 阅读： 次一、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;
2、 public class TestReadFile public static void Main(String args) / Read text file C:temptest.txt FileStream fs = new FileStream(c:temptest.txt , FileMode.Open, FileAccess.Read); StreamReader sr = new StreamReader(fs); String line=sr.ReadLine(); while (line!=null) Console.WriteLine(line); line=sr.Read
3、Line(); 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:temptest.txt FileStream fs = new FileStream(c:temptest.txt , FileMode.OpenOrCreate, FileAccess.Write); StreamWriter sw = new StreamWriter(fs);
4、 / 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:tempsource.txt, C:tempdest.txt ); 五、移动文件：using System;
5、using System.IO;class TestMoveFile public static void Main() File.Move(c:tempabc.txt, C:tempdef.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; ti
6、mer.Start(); timer.Enabled = true; while ( Console.Read() != q ) /- public static void DisplayTimeEvent( object source, ElapsedEventArgs e ) Console.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：using S
7、ystem;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( strS
8、QL, conn ); OleDbDataReader reader = null; try conn.Open(); reader = cmd.ExecuteReader(); while (reader.Read() ) Console.WriteLine(First Name:0, Last Name:1, readerFirstName, readerLastName); catch (Exception e) Console.WriteLine(e.Message); finally conn.Close(); 九、连接SQL Server数据库：using System;using
9、 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.ExecuteRead
10、er(); 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;
11、 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(); ada
12、pter.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.WriteXm
13、l(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) ; / c
14、reate 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:n0, e.Message); finally conn.Close(); 十二、使用OLECo
15、nn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
16、 OleDbDataAdapter( strSQL, conn ); conn.Open(); DataSet ds = new DataSet(); cmd.Fill( ds, employee ); DataTable dt = ds.Tables0; foreach( DataRow dr in dt.Rows ) Console.WriteLine(First name: + drFirstName.ToString() + Last name: + drLastName.ToString(); conn.Close(); 十三、读取表的属性：using System;using Sy
17、stem.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, co
18、nn ); conn.Open(); DataSet ds = new DataSet(); cmd.Fill( ds, employee ); DataTable dt = ds.Tables0; 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
19、.AutoIncrement+ ,+dc.AllowDBNull ); conn.Close(); ASP.NET方面的十四、一个ASP.NET程序： void Button1_Click(Object sender, EventArgs e) Label1.Text=TextBox1.Text; Enter your name: 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.Windo
20、ws.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 Dis
21、pose( bool disposing ) if( disposing ) if (components != null) components.Dispose(); base.Dispose( disposing ); #region Windows Form Designer generated code private void InitializeComponent() ponents = new System.ComponentModel.Container(); this.Size = new System.Drawing.Size(300,300); this.Text = F
22、orm1; 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.TabI
23、ndex = 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
24、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 SimpleFor
25、m(); 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：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
26、.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 IpAd
27、dr.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 s
28、tatic void Main() try / Construct a new mail message MailMessage message = new MailMessage(); message.From = ; message.To = ; 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.A
29、dd(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
30、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.Form
31、s.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
32、 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.R
33、un(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
34、;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
35、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 Numbe
36、r: + 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:tempxmltest.x