一、从控制台读取东西代码片断: using System;
namespace ConsoleApplication4 { class Program { static void Main(string[] args) { Console.Write("Enter your name:"); string strName = Console.ReadLine(); Console.WriteLine("Hi " + strName); Console.ReadKey(); } } } 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.OleDb; class TestADO { static void Main(string[] args) { string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\test.mdb"; string strSQL = "SELECT * FROM tb" ; 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["id"], reader["name"]); } } catch (Exception e) { Console.WriteLine(e.Message); } finally { conn.Close(); } Console.ReadKey(); } } 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 employee", 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); } Console.ReadKey(); } } 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=@"d:/output.xml"; SqlConnection conn = new SqlConnection("server=DD-ITSHIWEINA;uid=sa;pwd=123;database=pubs"); String strSql = "SELECT FName, LName FROM employee"; SqlDataAdapter adapter = new SqlDataAdapter(); adapter.SelectCommand = new SqlCommand(strSql,conn); // Build the DataSet DataSet ds = new DataSet();
adapter.Fill(ds, "employee"); // 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;Data Source=d:\\test.mdb"; string strSQL = "INSERT INTO tb(name) VALUES('nana')" ; // 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;Data Source=c:\\test.mdb"; string strSQL = "SELECT * FROM tb";
OleDbConnection conn = new OleDbConnection(strDSN); OleDbDataAdapter cmd = new OleDbDataAdapter(strSQL, conn);
conn.Open(); DataSet ds = new DataSet(); cmd.Fill(ds, "tb"); DataTable dt = ds.Tables[0];
foreach (DataRow dr in dt.Rows) { Console.WriteLine("First name:" + dr["id"].ToString() + "Last name:" + dr["name"].ToString()); } conn.Close(); Console.ReadKey(); }
} 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# %> <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 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.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 ); } Windows Form Designer generated code#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.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;
namespace ConsoleApplication4 { class Program { static void Main(string[] args) { IPHostEntry ipEntry = Dns.GetHostEntry("192.168.200.67"); Console.WriteLine("Host name:{0}",ipEntry.HostName); Console.ReadKey(); } } } 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 ); } Windows Form Designer generated code#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.; } }
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