☆由于一些人对vb.net和c#选择方面存...... 由于一些人对vb.net和c#选择方面存在一些困惑,其实只是语法习惯问题,我把它们的语法列出来比较一下,大家有个感性认识。 1.变量声名 C# 语法 int x; String s; String s1, s2; Object o; Object obj = new Object(); public String name; VB语法 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语句 C#: Response.Write("中文c#技术站"); VB: Response.Write("中文c#技术站") 3.注释语句 //中文c#技术站 /* 欢迎访问 , 中文c#技术站 */ VB: '中文c#技术站 4.获得URL 传递的变量 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.声明属性 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.数组 C# String[] a = new String[3]; a[0] = "1"; a[1] = "2"; a[2] = "3"; //二维数组 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变量初始化 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;判断语句(If 语句) if (Request.QueryString != null) { ... } VB: If Not (Request.QueryString = Null) ... End If 9.分支语句(case 语句) C#: switch (FirstName) { case "John" : ... break; case "Paul" : ... break; case "Ringo" : ... break; } VB: Select (FirstName) case "John" : ... case "Paul" :... case "Ringo" : ... End Select 10 For循环语句 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 11 While 循环 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 字符串连接 C#: String s1; String s2 = "hello"; s2 += " world"; s1 = s2 + " !!!"; VB: Dim s1, s2 As String s2 = "hello" s2 &= " world" s1 = s2 & " !!!" 声明事件 C#: void MyButton_Click(Object sender, EventArgs E) { ... } VB: Sub MyButton_Click(Sender As Object, E As EventArgs) ... End Sub 13 声明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 数据类型转换 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 类的声明和继承 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 声明类的主函数 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 标准模块 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 |
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