VB.net 2010 视频教程 VB.net 2010 视频教程 python基础视频教程
SQL Server 2008 视频教程 c#入门经典教程 Visual Basic从门到精通视频教程
当前位置:
首页 > VB.net教程 >
  • C# 与 VB.NET 对比

1.0     Introduction

1.1      Purpose & Scope

This document is to compare the syntax between the VB.Net and C#.Net for various coding concepts.

2.0     Comparison

2.1      Program Structure

VB.NET

C#.NET

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 + "!");
      }
   }
}

 

2.2      Comments

VB.NET

C#.NET

' Single line only
REM Single line only
''' <summary>XML comments</summary>

// Single line
/* Multiple
    line  */
/// <summary>XML comments on single line</summary>
/** <summary>XML comments on multiple lines</summary> */

2.3      Data Types

VB.NET

C#.NET

Value Types
Boolean
Byte, SByte
Char
Short, UShort, Integer, UInteger, Long, ULong
Single, Double
Decimal
Date

Reference Types
Object
String

Initializing
Dim correct As Boolean = True
Dim b As Byte = &H2A   'hex
Dim o As Byte = &O52   'octal
Dim person As Object = Nothing
Dim name As String = "Dwight"
Dim grade As Char = "B"c
Dim today As Date = #12/31/2007 12:15:00 PM#
Dim amount As Decimal = 35.99@
Dim gpa As Single = 2.9!
Dim pi As Double = 3.14159265
Dim lTotal As Long = 123456L
Dim sTotal As Short = 123S
Dim usTotal As UShort = 123US
Dim uiTotal As UInteger = 123UI
Dim ulTotal As ULong = 123UL

Type Information
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
short, ushort, int, uint, long, ulong
float, double
decimal
DateTime   (not a built-in C# type)

Reference Types
object
string

Initializing
bool correct = true;
byte b = 0x2A;   // hex

object person = null;
string name = "Dwight";
char grade = 'B';
DateTime today = DateTime.Parse("12/31/2007 12:15:00");
decimal amount = 35.99m;
float gpa = 2.9f;
double pi = 3.14159265;
long lTotal = 123456L;
short sTotal = 123;
ushort usTotal = 123;
uint uiTotal = 123;
ulong ulTotal = 123;

Type Information
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)

2.4      Constants

VB.NET

C#.NET

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;

2.5      Enumerations

VB.NET

C#.NET

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

2.6      Operators

VB.NET

C#.NET

Comparison
=  <  >  <=  >=  <>

Arithmetic
+  -  *  /
Mod
"  (integer division)
^  (raise to a power)

Assignment
=  +=  -=  *=  /=  "=  ^=  <<=  >>=  &=

Bitwise
And   Or   Xor   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
+

2.7      Choices

VB.NET

C#.NET

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?" Elsegreeting = "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
}

2.8      Loops

VB.NET

C#.NET

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
  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
}

2.9      Arrays

VB.NET

C#.NET

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;

2.10 Functions

VB.NET

C#.NET

' 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 AsInteger()) 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, ""); 
}

2.11 Strings

VB.NET

C#.NET

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
"r    // carriage-return
"n    // line-feed
"t    // tab
""    // backslash
""    // quote 


// 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"

2.12 Exception Handling

VB.NET

C#.NET

' 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(); 
}

2.13 Namespaces

VB.NET

C#.NET

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;

2.14 Classes / Interfaces

VB.NET

C#.NET

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 {
   ...
}

2.15 Constructors / Destructors

VB.NET

C#.NET

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
  }
}

2.16 Using Objects

VB.NET

C#.NET

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 IsNothing 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);
}

2.17 Structs

VB.NET

C#.NET

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

2.18 Properties

VB.NET

C#.NET

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++;

2.19 Delegates / Events

VB.NET

C#.NET

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, AddressOfMy_MsgArrivedCallback 
' Won't throw an exception if obj is Nothing

RaiseEvent MsgArrivedEvent("Test message") 
RemoveHandler MsgArrivedEvent, AddressOfMy_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) 
HandlesMyButton.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); 
}

2.20 Console I/O

VB.NET

C#.NET

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"

2.21 File I/O

VB.NET

C#.NET

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 NewBinaryReader(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();

 

 


相关教程