轉貼（天極論壇）：vb.net和c#語法比較
阿新 • • 發佈：2019-01-22
1.變數聲名
C# 語法
int x;
String s;
String s1, s2;
Object o;
Object obj = new Object();
public String name;
VB語法
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語句
C#:
Response.Write("中文c#技術站");
VB:
Response.Write("中文c#技術站")
3.註釋語句
//中文c#技術站
/*
歡迎訪問
，
中文c#技術站
*/
VB:
'中文c#技術站
4.獲得URL 傳遞的變數
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.宣告屬性
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.陣列
C#
String[] a = new String[3];
a[0] = "1";
a[1] = "2";
a[2] = "3";
//二維陣列
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變數初始化
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;判斷語句(If 語句)
if (Request.QueryString != null) {
...
}
VB:
If Not (Request.QueryString = Null)
...
End If
9.分支語句(case 語句)
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迴圈語句
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 迴圈
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 字串連線
C#:
String s1;
String s2 = "hello";
s2 += " world";
s1 = s2 + " !!!";
VB:
Dim s1, s2 As String
s2 = "hello"
s2 &= " world"
s1 = s2 & " !!!"
宣告事件
C#:
void MyButton_Click(Object sender,
EventArgs E) {
...
}
VB:
Sub MyButton_Click(Sender As Object,
E As EventArgs)
...
End Sub
13 宣告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 資料型別轉換
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 類的宣告和繼承
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 宣告類的主函式
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 標準模組
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