VB.net and C # syntax comparisons

Comparison | Grammar because some people have some confusion about vb.net and C # choice, it's just the grammar habit problem, I put the grammar listed to compare, we have a perceptual knowledge.



1. Variable reputation

C # syntax

int x;

String s;

String S1, S2;

Object o;

Object obj = new Object ();

public String name;

VB Grammar

Dim x as Integer

Dim S as String

Dim s1, S2 as String

Dim o ' implicitly Object

Dim obj as New Object ()

Public name as String





2 statements

C#:

Response.Write ("Chinese C # Technology station");

Vb:

Response.Write ("Chinese C # Technical station")



3. Comment Statement

Chinese C # Technology station

/*

Welcome to visit

，

Chinese C # Technology station

*/



Vb:

' Chinese C # technology station



4. Get the URL pass variable

C#:

String s = request.querystring["Name"];

String value = request.cookies["Key"];

Vb:

Dim s, value as String

s = Request.QueryString ("Name")

Value = Request.Cookies ("Key"). Value

5. Declaring properties

C#:

Public String Name {



get {

...

return ...;

}



set {

. = value;

}



}



Vb:

Public Property Name as String



Get

...

return ...;

End Get



Set

. = Value;

End Set



End Property

6. Array

C#

String[] A = new string[3];

A[0] = "1";

A[1] = "2";

A[2] = "3";

Two-dimensional array

String[][] A = new string[3][3];

A[0][0] = "1";

A[1][0] = "2";

A[2][0] = "3";

Vb:

Dim A (3) as String

A (0) = "1"

A (1) = "2"

A (2) = "3"



Dim A (3,3) as String

A (0,0) = "1"

A (1,0) = "2"

A (2,0) = "3"



Dim A () as String

A (0,0) = "1"

A (1,0) = "2"

A (2,0) = "3"



Dim A (,) as String

A (0,0) = "1"

A (1,0) = "2"

A (2,0) = "3"





7 Variable Initialization

C#:

String s = "Hello world";

int i = 1

Double[] A = {3.00, 4.00, 5.00};

Vb:

Dim s as String = "Hello World"

Dim I as Integer = 1

Dim A () as Double = {3.00, 4.00, 5.00}



8; Judgment statement (IF statement)

if (request.querystring!= null) {

...

}



Vb:

If not (request.querystring = Null)

...

End If



9. Branch statement (case statement)

C#:

Switch (FirstName) {

Case "John":

...

Break

Case "Paul":

...

Break

Case "Ringo":

...

Break

}

Vb:

Select (FirstName)

Case "John":

...

Case "Paul": ...

Case "Ringo":

...

End Select



A For Loop statement

C#

for (int i=0; i<3; i++)

A (i) = "Test";

Vb:

Dim I as Integer

For I = 0 to 2

A (I) = "Test"

Next



One while loop

C#:

int i = 0;

while (i<3) {

Console.WriteLine (i.ToString ());

i + 1;

}

Vb:

Dim I as Integer

I = 0

Do While I < 3

Console.WriteLine (i.ToString ())

i = i + 1

Loop

12 String Connection

C#:

String S1;

String s2 = "Hello";

S2 = "World";

S1 = s2 + "!!!";

Vb:

Dim s1, S2 as String

S2 = "Hello"

S2 &= "World"

S1 = s2 & "!!!"





declaring events

C#:

void MyButton_Click (Object sender,

EventArgs E) {

...

}

Vb:

Sub MyButton_Click (Sender as Object,

E as EventArgs)

...

End Sub





13 Declaring object

C#

MyObject obj = (MyObject) session["Some Value"];

Imyobject iobj = obj

Vb:

Dim BJ as MyObject

Dim Iobj as Imyobject

obj = Session ("Some Value")

Iobj = CType (obj, imyobject)





14 Data type Conversions

C#

int i = 3;

String s = i.tostring ();

Double D = double.parse (s);

Vb:

Dim I as Integer

Dim S as String

Dim D as Double



i = 3

s = i.tostring ()

D = CDBL (s)





15 declaration and inheritance of classes

C#:

Using System;



Namespace MySpace {



public class Foo:bar {



int x;



Public Foo () {x = 4;}

public void Add (int x) {this.x = x;}

public int Getnum () {return x;}

}



}



Vb:

Imports System



Namespace MySpace



Public Class foo:inherits Bar



Dim x as Integer



Public Sub New ()

MyBase.New ()

x = 4

End Sub



Public Sub Add (x as Integer)

me.x = me.x + x

End Sub



Public Function Getnum () as Integer

return x

End Function



End Class



End Namespace



16 declaring the main function of a class

C#:

Using System;



public class Consolecs {



Public Consolecs () {

Console.WriteLine ("Object Created");

}



public static void Main (string[] args) {

Console.WriteLine ("Hello World");

Consolecs CCS = new Consolecs ();

}



}



Vb

Imports System



Public Class Consolevb



Public Sub New ()

MyBase.New ()

Console.WriteLine ("Object Created")

End Sub



Public Shared Sub Main ()

Console.WriteLine ("Hello World")

Dim CVB as Consolevb

CVB = New Consolevb ()

End Sub



End Class





17 standard Modules

C#

Using System;



public class Module {



public static void Main (string[] args) {

Console.WriteLine ("Hello World");

}



}

Vb:

Imports System



Public Module Consolevb



Public Sub Main ()

Console.WriteLine ("Hello World")

End Sub



End Module