VB.net與C#語(yǔ)法對(duì)比及轉(zhuǎn)換 VB.NET and C# Comparison This is a quick reference guide to highlight some key syntactical differences between VB.NET (version 2) and C#. Hope you find this useful! Thank you to Tom Shelton, Fergus Cooney, Steven Swafford and others for your contributions. Also see Java and C# Comparison.
Program Structure Comments Data Types Constants Enumerations Operators Choices Loops Arrays Functions Strings Exception Handling Namespaces Classes / Interfaces Constructors / Destructors Using Objects Structs Properties Delegates / Events Console I/O File I/O
VB.NET Program Structure C# Imports System
Namespace Hello Class HelloWorld Overloads Shared Sub Main(ByVal args() As String) Dim name As String = "VB.NET"
'See if an argument was passed from the command line If args.Length = 1 Then name = args(0)
Console.WriteLine("Hello, " & name & "!") End Sub End Class End Namespace using System;
namespace Hello { public class HelloWorld { public static void Main(string[] args) { string name = "C#";
// See if an argument was passed from the command line if (args.Length == 1) name = args[0];
Console.WriteLine("Hello, " + name + "!"); } } } VB.NET Comments C# ' Single line only Rem Single line only // Single line /* Multiple line */ /// XML comments on single line /** XML comments on multiple lines */ VB.NET Data Types C# Value Types Boolean Byte Char (example: "A"c) Short, Integer, Long Single, Double Decimal Date
Reference Types Object String
Dim x As Integer Console.WriteLine(x.GetType()) ' Prints System.Int32 Console.WriteLine(GetType(Integer)) ' Prints System.Int32 Console.WriteLine(TypeName(x)) ' Prints Integer
' Type conversion Dim d As Single = 3.5 Dim i As Integer = CType(d, Integer) ' set to 4 (Banker's rounding) i = CInt(d) ' same result as CType i = Int(d) ' set to 3 (Int function truncates the decimal) Value Types bool byte, sbyte char (example: 'A') short, ushort, int, uint, long, ulong float, double decimal DateTime (not a built-in C# type)
Reference Types object string
int x; Console.WriteLine(x.GetType()); // Prints System.Int32 Console.WriteLine(typeof(int)); // Prints System.Int32 Console.WriteLine(x.GetType().Name); // prints Int32
// Type conversion float d = 3.5f; int i = (int)d; // set to 3 (truncates decimal) VB.NET Constants C# Const MAX_STUDENTS As Integer = 25 ' Can set to a const or var; may be initialized in a constructor ReadOnly MIN_DIAMETER As Single = 4.93 const int MAX_STUDENTS = 25; // Can set to a const or var; may be initialized in a constructor readonly float MIN_DIAMETER = 4.93f; VB.NET Enumerations C# Enum Action Start [Stop] ' Stop is a reserved word Rewind Forward End Enum
Enum Status Flunk = 50 Pass = 70 Excel = 90 End Enum
Dim a As Action = Action.Stop If a <> Action.Start Then _ Console.WriteLine(a.ToString & " is " & a) ' Prints "Stop is 1"
Console.WriteLine(Status.Pass) ' Prints 70 Console.WriteLine(Status.Pass.ToString()) ' Prints Pass enum Action {Start, Stop, Rewind, Forward}; enum Status {Flunk = 50, Pass = 70, Excel = 90};
Action a = Action.Stop; if (a != Action.Start) Console.WriteLine(a + " is " + (int) a); // Prints "Stop is 1"
Console.WriteLine((int) Status.Pass); // Prints 70 Console.WriteLine(Status.Pass); // Prints Pass VB.NET Operators C# Comparison = < > <= >= <>
Arithmetic + - * / Mod \ (integer division) ^ (raise to a power)
Assignment = += -= *= /= \= ^= <<= >>= &=
Bitwise And Or Not << >>
Logical AndAlso OrElse And Or Xor Not
Note: AndAlso and OrElse perform short-circuit logical evaluations
String Concatenation & + Comparison == < > <= >= !=
Arithmetic + - * / % (mod) / (integer division if both operands are ints) Math.Pow(x, y)
Assignment = += -= *= /= %= &= |= ^= <<= >>= ++ --
Bitwise & | ^ ~ << >>
Logical && || & | ^ !
Note: && and || perform short-circuit logical evaluations
String Concatenation + VB.NET Choices C# greeting = IIf(age < 20, "What's up?", "Hello")
' One line doesn't require "End If" If age < 20 Then greeting = "What's up?" If age < 20 Then greeting = "What's up?" Else greeting = "Hello"
' Use : to put two commands on same line If x <> 100 And y < 5 Then x *= 5 : y *= 2
' Preferred If x <> 100 And y < 5 Then x *= 5 y *= 2 End If
' To break up any long single line use _ If whenYouHaveAReally < longLine And _ itNeedsToBeBrokenInto2 > Lines Then _ UseTheUnderscore(charToBreakItUp)
'If x > 5 Then x *= y ElseIf x = 5 Then x += y ElseIf x < 10 Then x -= y Else x /= y End If
Select Case color ' Must be a primitive data type Case "pink", "red" r += 1 Case "blue" b += 1 Case "green" g += 1 Case Else other += 1 End Select greeting = age < 20 ? "What's up?" : "Hello";
if (age < 20) greeting = "What's up?"; else greeting = "Hello";
// Multiple statements must be enclosed in {} if (x != 100 && y < 5) { x *= 5; y *= 2; }
No need for _ or : since ; is used to terminate each statement.
if (x > 5) x *= y; else if (x == 5) x += y; else if (x < 10) x -= y; else x /= y;
// Every case must end with break or goto case switch (color) { // Must be integer or string case "pink": case "red": r++; break; case "blue": b++; break; case "green": g++; break; default: other++; break; // break necessary on default } VB.NET Loops C# Pre-test Loops: While c < 10 c += 1 End While Do Until c = 10 c += 1 Loop Do While c < 10 c += 1 Loop For c = 2 To 10 Step 2 Console.WriteLine(c) Next
Post-test Loops: Do c += 1 Loop While c < 10 Do c += 1 Loop Until c = 10
' Array or collection looping Dim names As String() = {"Fred", "Sue", "Barney"} For Each s As String In names Console.WriteLine(s) Next
' Breaking out of loops Dim i As Integer = 0 While (True) If (i = 5) Then Exit While i += 1 End While
' Continue to next iteration For i = 0 To 4 If i < 4 Then Continue For Console.WriteLine(i) ' Only prints 4 Next Pre-test Loops: // no "until" keyword while (c < 10) c++;
for (c = 2; c <= 10; c += 2) Console.WriteLine(c);
Post-test Loop:
do c++; while (c < 10);
// Array or collection looping string[] names = {"Fred", "Sue", "Barney"}; foreach (string s in names) Console.WriteLine(s);
// Breaking out of loops int i = 0; while (true) { if (i == 5) break; i++; }
// Continue to next iteration for (i = 0; i < 5; i++) { if (i < 4) continue; Console.WriteLine(i); // Only prints 4 } VB.NET Arrays C# Dim nums() As Integer = {1, 2, 3} For i As Integer = 0 To nums.Length - 1 Console.WriteLine(nums(i)) Next
' 4 is the index of the last element, so it holds 5 elements Dim names(4) As String names(0) = "David" names(5) = "Bobby" ' Throws System.IndexOutOfRangeException
' Resize the array, keeping the existing values (Preserve is optional) ReDim Preserve names(6)
Dim twoD(rows-1, cols-1) As Single twoD(2, 0) = 4.5
Dim jagged()() As Integer = { _ New Integer(4) {}, New Integer(1) {}, New Integer(2) {} } jagged(0)(4) = 5 int[] nums = {1, 2, 3}; for (int i = 0; i < nums.Length; i++) Console.WriteLine(nums[i]);
// 5 is the size of the array string[] names = new string[5]; names[0] = "David"; names[5] = "Bobby"; // Throws System.IndexOutOfRangeException
// C# can't dynamically resize an array. Just copy into new array. string[] names2 = new string[7]; Array.Copy(names, names2, names.Length); // or names.CopyTo(names2, 0);
float[,] twoD = new float[rows, cols]; twoD[2,0] = 4.5f;
int[][] jagged = new int[3][] { new int[5], new int[2], new int[3] }; jagged[0][4] = 5; VB.NET Functions C# ' Pass by value (in, default), reference (in/out), and reference (out) Sub TestFunc(ByVal x As Integer, ByRef y As Integer, ByRef z As Integer) x += 1 y += 1 z = 5 End Sub
Dim a = 1, b = 1, c As Integer ' c set to zero by default TestFunc(a, b, c) Console.WriteLine("{0} {1} {2}", a, b, c) ' 1 2 5
' Accept variable number of arguments Function Sum(ByVal ParamArray nums As Integer()) As Integer Sum = 0 For Each i As Integer In nums Sum += i Next End Function ' Or use Return statement like C#
Dim total As Integer = Sum(4, 3, 2, 1) ' returns 10
' Optional parameters must be listed last and must have a default value Sub SayHello(ByVal name As String, Optional ByVal prefix As String = "") Console.WriteLine("Greetings, " & prefix & " " & name) End Sub
SayHello("Strangelove", "Dr.") SayHello("Madonna")
// Pass by value (in, default), reference (in/out), and reference (out) void TestFunc(int x, ref int y, out int z) { x++; y++; z = 5; } int a = 1, b = 1, c; // c doesn't need initializing TestFunc(a, ref b, out c); Console.WriteLine("{0} {1} {2}", a, b, c); // 1 2 5
// Accept variable number of arguments int Sum(params int[] nums) { int sum = 0; foreach (int i in nums) sum += i; return sum; }
int total = Sum(4, 3, 2, 1); // returns 10
/* C# doesn't support optional arguments/parameters. Just create two different versions of the same function. */ void SayHello(string name, string prefix) { Console.WriteLine("Greetings, " + prefix + " " + name); }
void SayHello(string name) { SayHello(name, ""); } VB.NET Strings C# Special character constants vbCrLf, vbCr, vbLf, vbNewLine vbNullString vbTab vbBack vbFormFeed vbVerticalTab ""
' String concatenation (use & or +) Dim school As String = "Harding" & vbTab school = school & "University" ' school is "Harding (tab) University"
' Chars Dim letter As Char = school.Chars(0) ' letter is H letter = Convert.ToChar(65) ' letter is A letter = Chr(65) ' same thing Dim word() As Char = school.ToCharArray() ' word holds Harding
' No string literal operator Dim msg As String = "File is c:\temp\x.dat"
' String comparison Dim mascot As String = "Bisons" If (mascot = "Bisons") Then ' true If (mascot.Equals("Bisons")) Then ' true If (mascot.ToUpper().Equals("BISONS")) Then ' true If (mascot.CompareTo("Bisons") = 0) Then ' true
Console.WriteLine(mascot.Substring(2, 3)) ' Prints "son"
' String matching If ("John 3:16" Like "Jo[Hh]? #:*") Then 'true
Imports System.Text.RegularExpressions ' More powerful than Like Dim r As New Regex("Jo[hH]. \d:*") If (r.Match("John 3:16").Success) Then 'true
' My birthday: Oct 12, 1973 Dim dt As New DateTime(1973, 10, 12) Dim s As String = "My birthday: " & dt.ToString("MMM dd, yyyy")
' Mutable string Dim buffer As New System.Text.StringBuilder("two ") buffer.Append("three ") buffer.Insert(0, "one ") buffer.Replace("two", "TWO") Console.WriteLine(buffer) ' Prints "one TWO three" Escape sequences \n, \r \t \\ \"
// String concatenation string school = "Harding\t"; school = school + "University"; // school is "Harding (tab) University"
// Chars char letter = school[0]; // letter is H letter = Convert.ToChar(65); // letter is A letter = (char)65; // same thing char[] word = school.ToCharArray(); // word holds Harding
// String literal string msg = @"File is c:\temp\x.dat"; // same as string msg = "File is c:\\temp\\x.dat";
// String comparison string mascot = "Bisons"; if (mascot == "Bisons") // true if (mascot.Equals("Bisons")) // true if (mascot.ToUpper().Equals("BISONS")) // true if (mascot.CompareTo("Bisons") == 0) // true
Console.WriteLine(mascot.Substring(2, 3)); // Prints "son"
// String matching // No Like equivalent - use regular expressions
using System.Text.RegularExpressions; Regex r = new Regex(@"Jo[hH]. \d:*"); if (r.Match("John 3:16").Success) // true
// My birthday: Oct 12, 1973 DateTime dt = new DateTime(1973, 10, 12); string s = "My birthday: " + dt.ToString("MMM dd, yyyy");
// Mutable string System.Text.StringBuilder buffer = new System.Text.StringBuilder("two "); buffer.Append("three "); buffer.Insert(0, "one "); buffer.Replace("two", "TWO"); Console.WriteLine(buffer); // Prints "one TWO three" VB.NET Exception Handling C# ' Throw an exception Dim ex As New Exception("Something is really wrong.") Throw ex
' Catch an exception Try y = 0 x = 10 / y Catch ex As Exception When y = 0 ' Argument and When is optional Console.WriteLine(ex.Message) Finally Beep() End Try
' Deprecated unstructured error handling On Error GoTo MyErrorHandler ... MyErrorHandler: Console.WriteLine(Err.Description)
// Throw an exception Exception up = new Exception("Something is really wrong."); throw up; // ha ha
// Catch an exception try { y = 0; x = 10 / y; } catch (Exception ex) { // Argument is optional, no "When" keyword Console.WriteLine(ex.Message); } finally { // Requires reference to the Microsoft.VisualBasic.dll // assembly (pre .NET Framework v2.0) Microsoft.VisualBasic.Interaction.Beep(); } VB.NET Namespaces C# Namespace Harding.Compsci.Graphics ... End Namespace
' or
Namespace Harding Namespace Compsci Namespace Graphics ... End Namespace End Namespace End Namespace
Imports Harding.Compsci.Graphics namespace Harding.Compsci.Graphics { ... }
// or
namespace Harding { namespace Compsci { namespace Graphics { ... } } }
using Harding.Compsci.Graphics; VB.NET Classes / Interfaces C# Accessibility keywords Public Private Friend Protected Protected Friend Shared
' Inheritance Class FootballGame Inherits Competition ... End Class
' Interface definition Interface IAlarmClock ... End Interface
// Extending an interface Interface IAlarmClock Inherits IClock ... End Interface
// Interface implementation Class WristWatch Implements IAlarmClock, ITimer ... End Class Accessibility keywords public private internal protected protected internal static
// Inheritance class FootballGame : Competition { ... }
// Interface definition interface IAlarmClock { ... }
// Extending an interface interface IAlarmClock : IClock { ... }
// Interface implementation class WristWatch : IAlarmClock, ITimer { ... } VB.NET Constructors / Destructors C# Class SuperHero Private _powerLevel As Integer
Public Sub New() _powerLevel = 0 End Sub
Public Sub New(ByVal powerLevel As Integer) Me._powerLevel = powerLevel End Sub
Protected Overrides Sub Finalize() ' Desctructor code to free unmanaged resources MyBase.Finalize() End Sub End Class class SuperHero { private int _powerLevel;
public SuperHero() { _powerLevel = 0; }
public SuperHero(int powerLevel) { this._powerLevel= powerLevel; }
~SuperHero() { // Destructor code to free unmanaged resources. // Implicitly creates a Finalize method } } VB.NET Using Objects C# Dim hero As SuperHero = New SuperHero ' or Dim hero As New SuperHero
With hero .Name = "SpamMan" .PowerLevel = 3 End With
hero.Defend("Laura Jones") hero.Rest() ' Calling Shared method ' or SuperHero.Rest()
Dim hero2 As SuperHero = hero ' Both reference the same object hero2.Name = "WormWoman" Console.WriteLine(hero.Name) ' Prints WormWoman
hero = Nothing ' Free the object
If hero Is Nothing Then _ hero = New SuperHero
Dim obj As Object = New SuperHero If TypeOf obj Is SuperHero Then _ Console.WriteLine("Is a SuperHero object.")
' Mark object for quick disposal Using reader As StreamReader = File.OpenText("test.txt") Dim line As String = reader.ReadLine() While Not line Is Nothing Console.WriteLine(line) line = reader.ReadLine() End While End Using SuperHero hero = new SuperHero();
// No "With" construct hero.Name = "SpamMan"; hero.PowerLevel = 3;
hero.Defend("Laura Jones"); SuperHero.Rest(); // Calling static method
SuperHero hero2 = hero; // Both reference the same object hero2.Name = "WormWoman"; Console.WriteLine(hero.Name); // Prints WormWoman
hero = null ; // Free the object
if (hero == null) hero = new SuperHero();
Object obj = new SuperHero(); if (obj is SuperHero) Console.WriteLine("Is a SuperHero object.");
// Mark object for quick disposal using (StreamReader reader = File.OpenText("test.txt")) { string line; while ((line = reader.ReadLine()) != null) Console.WriteLine(line); } VB.NET Structs C# Structure StudentRecord Public name As String Public gpa As Single
Public Sub New(ByVal name As String, ByVal gpa As Single) Me.name = name Me.gpa = gpa End Sub End Structure
Dim stu As StudentRecord = New StudentRecord("Bob", 3.5) Dim stu2 As StudentRecord = stu
stu2.name = "Sue" Console.WriteLine(stu.name) ' Prints Bob Console.WriteLine(stu2.name) ' Prints Sue struct StudentRecord { public string name; public float gpa;
public StudentRecord(string name, float gpa) { this.name = name; this.gpa = gpa; } }
StudentRecord stu = new StudentRecord("Bob", 3.5f); StudentRecord stu2 = stu;
stu2.name = "Sue"; Console.WriteLine(stu.name); // Prints Bob Console.WriteLine(stu2.name); // Prints Sue VB.NET Properties C# Private _size As Integer
Public Property Size() As Integer Get Return _size End Get Set (ByVal Value As Integer) If Value < 0 Then _size = 0 Else _size = Value End If End Set End Property
foo.Size += 1 private int _size;
public int Size { get { return _size; } set { if (value < 0) _size = 0; else _size = value; } }
foo.Size++; VB.NET Delegates / Events C# Delegate Sub MsgArrivedEventHandler(ByVal message As String)
Event MsgArrivedEvent As MsgArrivedEventHandler
' or to define an event which declares a delegate implicitly Event MsgArrivedEvent(ByVal message As String)
AddHandler MsgArrivedEvent, AddressOf My_MsgArrivedCallback ' Won't throw an exception if obj is Nothing RaiseEvent MsgArrivedEvent("Test message") RemoveHandler MsgArrivedEvent, AddressOf My_MsgArrivedCallback
Imports System.Windows.Forms
Dim WithEvents MyButton As Button ' WithEvents can't be used on local variable MyButton = New Button
Private Sub MyButton_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyButton.Click MessageBox.Show(Me, "Button was clicked", "Info", _ MessageBoxButtons.OK, MessageBoxIcon.Information) End Sub delegate void MsgArrivedEventHandler(string message);
event MsgArrivedEventHandler MsgArrivedEvent;
// Delegates must be used with events in C#
MsgArrivedEvent += new MsgArrivedEventHandler(My_MsgArrivedEventCallback); MsgArrivedEvent("Test message"); // Throws exception if obj is null MsgArrivedEvent -= new MsgArrivedEventHandler(My_MsgArrivedEventCallback);
using System.Windows.Forms;
Button MyButton = new Button(); MyButton.Click += new System.EventHandler(MyButton_Click);
private void MyButton_Click(object sender, System.EventArgs e) { MessageBox.Show(this, "Button was clicked", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information); } VB.NET Console I/O C# Console.Write("What's your name? ") Dim name As String = Console.ReadLine() Console.Write("How old are you? ") Dim age As Integer = Val(Console.ReadLine()) Console.WriteLine("{0} is {1} years old.", name, age) ' or Console.WriteLine(name & " is " & age & " years old.")
Dim c As Integer c = Console.Read() ' Read single char Console.WriteLine(c) ' Prints 65 if user enters "A" Console.Write("What's your name? "); string name = Console.ReadLine(); Console.Write("How old are you? "); int age = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("{0} is {1} years old.", name, age); // or Console.WriteLine(name + " is " + age + " years old.");
int c = Console.Read(); // Read single char Console.WriteLine(c); // Prints 65 if user enters "A" VB.NET File I/O C# Imports System.IO
' Write out to text file Dim writer As StreamWriter = File.CreateText("c:\myfile.txt") writer.WriteLine("Out to file.") writer.Close()
' Read all lines from text file Dim reader As StreamReader = File.OpenText("c:\myfile.txt") Dim line As String = reader.ReadLine() While Not line Is Nothing Console.WriteLine(line) line = reader.ReadLine() End While reader.Close()
' Write out to binary file Dim str As String = "Text data" Dim num As Integer = 123 Dim binWriter As New BinaryWriter(File.OpenWrite("c:\myfile.dat")) binWriter.Write(str) binWriter.Write(num) binWriter.Close()
' Read from binary file Dim binReader As New BinaryReader(File.OpenRead("c:\myfile.dat")) str = binReader.ReadString() num = binReader.ReadInt32() binReader.Close() using System.IO;
// Write out to text file StreamWriter writer = File.CreateText("c:\\myfile.txt"); writer.WriteLine("Out to file."); writer.Close();
// Read all lines from text file StreamReader reader = File.OpenText("c:\\myfile.txt"); string line = reader.ReadLine(); while (line != null) { Console.WriteLine(line); line = reader.ReadLine(); } reader.Close();
// Write out to binary file string str = "Text data"; int num = 123; BinaryWriter binWriter = new BinaryWriter(File.OpenWrite("c:\\myfile.dat")); binWriter.Write(str); binWriter.Write(num); binWriter.Close();
// Read from binary file BinaryReader binReader = new BinaryReader(File.OpenRead("c:\\myfile.dat")); str = binReader.ReadString(); num = binReader.ReadInt32(); binReader.Close();
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Copyright © 2003-2006 by Frank McCown Please send any corrections or comments to [email protected].
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本文來(lái)自CSDN博客,,轉(zhuǎn)載請(qǐng)標(biāo)明出處:http://blog.csdn.net/eray/archive/2007/04/01/1548513.aspx
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