将VB.Net代码转换为C#时发生逻辑错误 [英] Logic Error while converting VB.Net Code to C#
问题描述
我有这个VB.Net代码:
I have this VB.Net Code:
Dim t as String = "111100111000011110111110010111101001100001100011101000001010011100110110100110100000101001110010011001101"
Dim i as Integer
If (t.Length Mod 8) <> 0 Then
For i = 1 To 8 - (t.Length Mod 8)
t = "0" + t
Next
End If
当我将其转换为C#时,它变为:
When I convert it to C# it becomes:
string t = "111100111000011110111110010111101001100001100011101000001010011100110110100110100000101001110010011001101";
int i = 0;
if ((t.Length % 8) != 0)
{
for (i = 1; i <= (8 - (t.Length%8)); i++)
{
t = "0" + t;
}
}
问题是两个代码的结果不相同.因此VB.net代码执行7次,而C#代码执行4次.
The problem is the two codes are not same result. so the VB.net code is executing 7 times and the C# code is executing 4 times.
请告诉我是什么问题!
推荐答案
For
VB中的边界是预先计算的,在执行循环时不会更改.因此, t.Length Mod 8
会被计算一次,然后使用该值.
For
boundaries in VB are pre-calculated and do not change while the loop is executed. So t.Length Mod 8
is calculated once and then this value is used.
在C#中,每次都会评估条件,并且由于您不断更改 t
,因此 t.Length Mod 8
每次都会赋予新值.
In C# the condition is evaluated each time, and because you keep changing t
, t.Length Mod 8
gives new value each time.
此外,由于字符串在.NET中是不可变的,因此您的代码最多生成7个 t
的副本.您应该真正做到这一点:
Also because strings are immutable in .NET, your code generates up to 7 copies of t
. You should really do this:
Dim diff As Integer = t.Length Mod 8
If diff <> 0 Then
t = New String("0"c, 8 - diff) & t
End If
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