王者荣耀人物台词:C#和VB.net语法对比图

C#和VB.net的语法相差还是比较大的. 可能你会C#,可能你会VB.

将它们俩放在一起对比一下你就会很快读懂,并掌握另一门语言.

相信下面这张图会对你帮助很大.

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 Types            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 int MAX_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 Action = Action.Stop            If a <> Action.Start Then _            ‘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) a);            // 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  AndAlso  Or  OrElse  Not  <<  >>            ‘Logical            And  AndAlso  Or  OrElse  Not            ‘String Concatenation            & 

C#

//Comparison            ==  <  >  <=  >=  !=            //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 "End If", no "Else"            If language = "VB.NET" Then langType = "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 single command use _            If henYouHaveAReally < 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            ‘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[] names = {"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 < nums.Length; 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[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 Integer,            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 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 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 / y            Catch ex As Exception When y = 0 ‘Argument and When is optional              System.Console.WriteLine(ex.Message)            Finally              DoSomething()            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.DotNet.Community              ...            End Namespace            ‘or            Namespace ASPAlliance              Namespace DotNet                Namespace Community                  ...                End Namespace              End Namespace            End Namespace            Imports ASPAlliance.DotNet.Community

C#

namespace ASPAlliance.DotNet.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            ‘Inheritance            Class Articles              Inherits Authors              ...            End Class            ‘Interface definition            Interface IArticle               ...            End Interface            ‘Extending an interface            Interface IArticle              Inherits IAuthor              ...            End Interface            ‘Interface implementation            Class PublicationDate              Implements IArticle, IRating               ...            End Class

C#

//Accessibility keywords            public            private            internal            protected            protected internal            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 Integer              Public Sub New()                _topAuthor = 0              End Sub              Public Sub New(ByVal topAuthor As Integer)                Me._topAuthor = topAuthor              End Sub              Protected Overrides Sub Finalize()               ‘Desctructor code to free unmanaged resources                MyBase.Finalize()              End Sub            End Class

C#

class TopAuthor {              private int _topAuthor;              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 Then _              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.AuthorRanking = 3;            author.Rank("Scott");            TopAuthor.Demote() //Calling static method            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 AuthorRecord              Public 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 {                if (value < 0)                  _size = 0;                else                  _size = value;              }            }            foo.Size++;

Delegates / Events

VB.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, 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            ‘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", _                MessageBoxButtons.OK, MessageBoxIcon.Information)            End Sub

C#

delegate void MsgArrivedEventHandler(string message);            event MsgArrivedEventHandler MsgArrivedEvent;            //Delegates must be used with events in C#            MsgArrivedEvent += new MsgArrivedEventHandler              (My_MsgArrivedEventCallback);            //Throws exception if obj is null            MsgArrivedEvent("Test message");            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);            }

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 are 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 sequences            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 are 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();

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