[转] C # and VB.NET syntax comparison
The syntax of C # and VB.NET is still relatively large. Maybe you will C #, maybe you will vb.
Putting them together to compare you, you will read it quickly, and master another language.
I believe that the table below will help you.
Comments vb.net 'Single Line ONLY
REM SINGLE LINE ONLY C # // Single Line
/ * Multiple
Line * /
/// xml Comments on single line
/ ** XML Comments on Multiple Lines * / Data Types VB.NET 'Value Types
Boolean
Byte
Char (Example: "a")
Short, integer, long
SINGLE, DOUBLE
Decimal
Date
'Reference Types
Object
String
DIM X as integer
System.console.writeLine (x.gettype ())
System.console.writeline (TypeName (X))
'Type Conversion
DIM D As Single = 3.5
DIM I as integer = ctype (d, integer)
i = CINT (D)
i = int (d) c # // value type
Bool
Byte, sbyte
Char (Example: 'A')
Short, Ushort, Int, Uint, Long, Ulong
Float, Double
Decimal
Datetime
// REFERENCE TYPES
Object
String
INT X;
Console.writeline (x.gettype ())
Console.writeLine (Typeof (int))
// Type Conversion
FLOAT D = 3.5;
INT i = (int) D constants VB.NET const Max_authors as integer = 25
Readonly min_rank as single = 5.00 c # const amount in_authors = 25;
Readonly float min_ranking = 5.00; ENUMERATIONS VB.NET ENUM ACTION
Start
'Stop Is A Reserved Word
[STOP]
Rewind
Forward
END ENUM
ENUM STATUS
FLUNK = 50
Pass = 70
Excel = 90
END ENUM
Dim a as an action = action.stop
IF a <> action.start the_
'Prints "STOP IS 1"
System.Console.writeline (a.tostring & "is" & a)
'Prints 70
System.console.writeline (status.pass)
'Prints Pass
System.console.writeline (status.pass.tostring ()) C # enum action {start, stop, rewind, forward};
ENUM STATUS {FLUNK = 50, Pass = 70, Excel = 90}; action a = action.stop;
IF (a! = action.start)
// Prints "STOP IS 1"
System.Console.writeline (A "IS" (int));
// Prints 70
System.console.writeline (int) status.pass;
// Prints Pass
System.console.writeline (status.pass); Operators VB.NET 'Comparison
= <> <=> = <>
'AritHmetic
- * /
MOD
(Integer Division)
^ (Raise to a power)
'Assignment
= = - = * = / = = ^ = << = >> = & =
'Bitwise
And and Andalso or orelse not << >>
'Logical
And and Andalso or orelse not
'String ConcateNation
& C # // Comparist
== <> <=> =! =
// arithmetic
- * /
% (MOD)
/ (Integer Division if Both Operands Are INTS)
Math.Pow (x, y)
// Assignment
= = - = * = / =% = & = | = ^ = << = >> = -
// bitwise
& | ^ ~ << >>
// logical
&& ||!
// String ConcateNation
Choices VB.Net Greeting = IIF (age <20, "What's up?", "Hello")
'One Line Doesn't Require "Endiff", NO "ELSE"
If Language = "VB.NET" TENGTYPE = "Verbose"
'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
'or to Break Up any long salesle command use _
IF HenyouhaveareAlly 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 'Must Be a Primitive Data Type SELECT CASE Color Case "Black", "Red" R = 1 Case "blue" B = 1 Case "Green" G = 1 Case Else Other = 1 End Select C # Greeting = AGE <20? "What's up?": "Hello"; IF (x! = 100 && y <5) { // Multiple Statements Must Be enclosed in {} X * = 5; Y * = 2; } IF (x> 5) X * = Y; Else IF (x == 5) X = Y; ELSE IF (x <10) X - = Y; Else X / = Y; // must be integer or string Switch (color) { Case "Black": Case "Red": R ; Break; Case "blue" Break; Case "Green": G ; Break; DEFAULT: OTHER ; Break; } Loops vb.net 'pre-test loops: While C <10 C = 1 End while do until c = 10 C = 1 Loop 'POST-TEST LOOP: Do While C <10 C = 1 Loop For c = 2 to 10 step 2 System.console.writeLine (C) NEXT 'Array or Collection looping DIM Names as string () = {"steven", "suok", "sarah"} For Each S as string in names System.console.writeLine (s) Next C # // pre-test loops: while (i <10) i ; For (i = 2; i <= 10; i = 2) System.console.writeline (i); // Post-test loop: DO i ; While (i <10); // array or collection looping String [] name = {"steven", "suok", "sarah"} FOREACH (STRING S in Names) System.Console.writeline (s); Arrays VB.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) = "steven" 'Throws system.indexoutofrangeexception Names (5) = "sarah" '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 c # int [] NUMS = {1, 2, 3}; For (int i = 0; i Console.writeline (NUMS [I]); // 5 is The size of the array String [] Names = new string [5]; Names [0] = "steven"; // throws system.indexoutofrangeexception Names [5] = "sarah" // c # can't Dynamically Resize an Array. // Just Copy Into New Array. String [] Names2 = new string [7]; // or names.copyto (names2, 0); Array.copy (Names, Names2, Names.length); Float [,] twod = new float [rows, cols]; TWOD [2,0] = 4.5; int [] jagged = new int [3] [] { New int [5], new int rt [2], new int [3]}; Jagged [0] [4] = 5; functions vb.net 'Pass by value (in, default), Reference '(In / Out), and Reference (OUT) Sub testfunc (byval x as integer, byref y as in BYREF Z AS INTEGER) X = 1 Y = 1 z = 5 End Sub 'c set to zero by Default DIM A = 1, B = 1, C as integer Testfunc (A, B, C) System.console.writeline ("{0} {1} {2}", A, B, C) '1 2 5 'Accept Variable Number of ArgumentsFunction Sum (Byval Paramarray Nums As Integer ()) AS Integer SUM = 0 For Each I as integer in Nums SUM = i NEXT End Function 'or Use a 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 = "") System.Console.writeline ("Greetings," & Prefix & "& name) End Sub Sayhello ("Steven", "Dr.") Sayhello ("Suok") C # // 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); System.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) { System.Console.writeline ("Greetings," Prefix " Name); } Void Sayhello (String name) { Sayhello (Name, "); } Exception Handling VB.NET 'DEPRECATED UNSTRUCTURED ERROR HANDLING ON Error Goto MyErrorhandler ... MyErrorhandler: System.Console.writeline (Err.Description) DIM EX AS NEW EXCEPTION ("Something Has Really Gone WRONG.") Throw EX Try Y = 0 x = 10 / YCATCH EX AS Exception When Y = 0 'Argument and When IS Optional System.console.writeLine (ex.Message) Finally DOSMETHING () End Try C # Exception Up = New Exception ("Something IS Really Wrong."); Throw up; // ha ha Try { y = 0; x = 10 / y; } Catch (Exception EX) {// argument is optional, no "when" keyword Console.writeLine (ex.Message); } Finally { // do something } Namespaces VB.Net Namespace aspalliance.dot.com.community ... End Namespace 'OR Namespace aspalliance Namespace DotNet Namespace Community ... End Namespace End Namespace End Namespace Imports aspalliance.dotnet.community C # namespace aspalliance.dot.com.community { ... } // OR Namespace aspalliance { Namespace dotnet { Namespace Community { ... } } } Using aspalliance.dotnet.community; classes / interfaces vb.net 'Accessibility Keywords Public Private Friend Protected Protected Friend Shared 'Inheritancence Class Articles Inherits Authors ... END CLASS 'Interface Definition Interface IATICLE ... End interface 'Extending an interface Interface IATICLE Inherits IAUTHOR ... End interface 'Interface Implementation Class PublicationDate Implements iArticle, IRating ... End Class C # // Accessibility Keywords public Private Internal protected protected in Static // inheritance Class Articles: Authors { ... } // Interface definition Interface iArticle { ... } // extending an interface Interface iArticle: IAUTHOR { ... } // Interface Implementation Class publicationDate: iArticle, Irating { ... CONSTRUCTORS / DESTRUCTORS VB.NET CLASS TOPAUTHOR Private _topauthor as integerpublic sub new () _TopAuthor = 0 End Sub Public Sub New (Byval TopAuthor As Integer) Me._topauthor = TopAuthor End Sub Protected overrides sub firmize () 'Desctructor code to free unmanaged resources Mybase.finalize () End Sub End class c # Class TopAuthor { Private int _topauhouse; Public TopAuthor () { _topauThor = 0; } Public TopAuthor (int TopAuthor) { THIS._TOPAUTHOR = TopAuthor } ~ TopAuthor () { // deStructor Code to Free Unmanaged Resources. // Implicitly Creates a finalize method } } Objects VB.NET DIM Author as TopAuthor = New TopAuthor With Author .Name = "steven" .Authorranking = 3 End with Author.rank ("Scott") Author.demote () 'Calling Shared Method 'OR TopAuthor.rank () DIM Author2 as TopAuthor = Author 'Both Refer to Same Object Author2.name = "joe" System.console.writeline (Author2.name) 'Prints Joe Author = Nothing 'Free the Object IF author is nothing the _ Author = New TopAuthor DIM OBJ As Object = New TopAuthor If TypeOf Obj Is TopAuthor Then_ System.Console.writeline ("is a topauthor object.") C # TopAuthor Author = New TopAuthor (); // no "with" construct Author.name = "steven"; Author.Authorrancing = 3; Author.rank ("scott"); TopAuthor.Demote () // Calling staticMethod TopAuthor Author2 = Author // Both Refer to Same Object Author2.name = "joe"; System.console.writeline (Author2.name) // Prints Joe Author = null // free the object IF (author == null) Author = new TopAuthor (); Object obj = new TopAuthor (); IF (Obj Is TopAuthor) SYSTCONSOLE.WRITELINE ("IS A TopAuthor Object."); Structs VB.NET Structure AuthorRecordpublic Name As String Public Rank As Single Public Sub New (Byval Name As String, BYVAL RANK AS SINGLE) Me.name = name Me.rank = Rank End Sub End structure DIM Author as authorrecord = New AuthorRecord ("Steven", 8.8) Dim Author2 as AuthorRecord = Author Author2.name = "scott" System.console.writeline (Author.Name) 'Prints Steven System.console.writeline (Author2.name) 'Prints Scott C # struct authorrecord { Public String Name; Public float rank; Public AuthorRecord (String Name, Float Rank) { THIS.NAME = Name; THIS.RANK = Rank; } } AuthorRecord Author = New AuthorRecord ("Steven", 8.8); AuthorRecord Author2 = Author Author.name = "scott"; SystemConsole.writeline (Author.Name); // Prints Steven System.console.writeline (Author2.name); // Prints Scott Properties VB.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 C # private int _size; Public int size { Get { Return_size; } SET { Value <0) _size = 0; Else _size = value; } } Foo.size ; delegates / events vb.net delegate Sub MsgarriveDeventrandler (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' THROW An Exception IF Obj Is Nothingraiseevent MsgarriveDevent ("Test Message") REMOVEHANDAL MSGARRIVEDEVENT, Addressof my_msgarrivedcallback Imports System.Windows.Forms 'WitHevents Can't Be Used On Local Variable Dim withevents mybutton as button 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", _ MessageboxButton.ok, MessageBoxicon.information) End Sub C # delegate Void MsgarriveDeventHandler (String Message); Event MsgarriveDeventHandler MsgarriveDevent; // delegates Must Be Used with events in c # MsgarriveDevent = new msgarrivedeDeventhandler (My_MsgarriveDeventCallback); // throws Exception if Obj Is Null MsgarriveDevent ("Test Message"); MsgarriveDevent - = new msgarrivedeDeventhandler (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; } Console I / O VB.NET 'Special Character Constants VBCRLF, VBCR, VBLF, VBNEWLINE vbnullstring VBTAB VBBACK VBFormfeed VBverticalTab "" CHR (65) 'RETURNS' A ' System.Console.write ("What's your name?") Dim name as string = system.console.readline () System.Console.write ("How old is you?") DIM AGE AS INTEGER = VAL (System.Console.Readline ()) System.console.writeline ("{0} is {1} Years old.", Name, age) 'OR System.console.writeline (Name & "IS" & Age & "Years Old.") DIM C AS Integer C = system.console.read () 'Read Single Char System.console.writeline (c) 'Prints 65 if User Enters "a" c # // escape sequencees n, r t Convert.TOCHAR (65) // Returns 'A' - Equivalent to Chr (NUM) in VB // OR (char) 65 System.Console.write ("What's your name?"); String name = system.console.readline (); System.Console.write ("How old is you?"); Int Age = Convert.Toint32 (System.Console.Readline ()); System.console.writeLine ("{0} is {1} years old.", Name, AGE; // OR System.console.writeLine (Name "IS" Age "Years Old."); INT c = system.console.read (); // read single char System.console.writeLine (C); // Prints 65 if User Enters "a" File I / O VB.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 new binaryreader (file.openread) ("c: myfile.dat")) Str = binreader.readstring () Num = binreader.readInt32 () BinReader.close () C # 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 (); Note: This article is transferred from http://www.lemongtree.com/280.html.aspx
