asp+语法介绍(一) |
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| 2003-04-10 http://www.aspCool.com |
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ASP+ 现在支持两种语言C# (简称 ""C Sharp""), Visual Basic, and JScript.
基于习惯，在以下的语言介绍中，我们采用的练习和例程采用VB和C#语言来开发Web应用程序.如果想要得到关于.Net技术的详细资料，请去MS的站点 查看关于 NGWS SDK!
在下面的列表中，你可以看到关于这两种语言的语法的简要介绍
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(""豆腐"");
VB:
Response.Write(""豆腐"")
3.注释语句
//豆腐制作，都是精品
/*
豆腐制作
，
都是精品
*/
VB:
'豆腐制作，都是精品
' 豆腐制作
'，
'都是精品
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
本篇文章是由一篇英语的文章翻译来的，从这里面我们可以看到MS 为了统治Web编程领域，花费了多大的心思！
他完全的重新定义了Web编程的全部规范，使得Web编程变的更加简单和功能强大！
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