VB.NET and C# 差异
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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(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
// 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 == < > <= >= !=
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