VB-C +速度差 [英] VB - C+ Speed Differential
问题描述
这是什么?突然我可以发贴了吗?
使用C + DLL，我可以搜索目录0.46秒内可存储12000个块(512字节记录).真是动人.
我可以使用以下代码进行搜索:
导入 System.IO. DirectoryInfo
Imports System.IO.DirectoryInfo
导入 Microsoft.VisualBasic.FileIO
导入 System.Globalization
导入 System.Collections
公共 类 Form11
Public Class Form11
继承 System.Windows.Forms.表单
Inherits System.Windows.Forms.Form
暗 sw 如 新建 秒表
Dim sw As New Stopwatch
暗 t 如 字符串
Dim t As String
私有 Sub BeingTimed()
Private Sub BeingTimed()
暗 foo As System.Collections.ObjectModel. Of 字符串)
Dim foo As System.Collections.ObjectModel.ReadOnlyCollection(Of String)
foo = 文件系统 .FindInFiles("G:\ BOOK \" ， 克里斯不再怀疑他们会这么做" ， False ，Microsoft.VisualBasic.FileIO. SearchOption .SearchAllSubDirectories)
foo = FileSystem.FindInFiles("G:\BOOK\", "Chris no longer doubted that they would", False, Microsoft.VisualBasic.FileIO.SearchOption.SearchAllSubDirectories)
返回
Return
结束 子
End Sub
私有 Sub Button1_Click( ByVal 发件人 按系统.对象， ByVal e As 系统. EventArgs ) 手柄 Button1.单击
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Stopwatch1()
Stopwatch1()
BeingTimed()
BeingTimed()
Stopwatch1(错误)
Stopwatch1(False)
结束 子
End Sub
私有 Sub Stopwatch1(可选 ByRef 重设目标 布尔值 = 真)
Private Sub Stopwatch1(Optional ByRef Reset As Boolean = True)
如果重设然后
If Reset Then
sw.Reset()
sw.Reset()
sw.Start()
sw.Start()
其他
Else
暗 ts As TimeSpan = TimeSpan .FromMilliseconds(sw.ElapsedMilliseconds) '开始
Dim ts As TimeSpan = TimeSpan.FromMilliseconds(sw.ElapsedMilliseconds) ' Start
t = 字符串 .Format( CultureInfo .CurrentCulture， "{0:00}:{1:00}:{2:00}.{3:00}" ，小时，小时. ，ts.Seconds，ts.Milliseconds)
t = String.Format(CultureInfo.CurrentCulture, "{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds)
ts = ts
ts = ts
结束 如果
End If
结束 子
End Sub
结束 类
End Class
我的问题是，那非常快.为什么C +和VB之间存在巨大的速度差异? 因为VB是托管代码"，实际上并没有 回答问题.
My question is, that's pretty fast. Why the enormous speed differential between C+ and VB? "Becase VB is managed code", doesn't really answer the question.
Renee
推荐答案
蕾妮，
许多Framework代码可能已经过优化，并且可能是使用C编译器以非托管代码编写的.
A lot of the Framework code is probably optimised and probably written in unmanaged code using a C compiler.
我认为编写代码应尽可能接近机器语言".或尽可能接近汇编语言"
I believe writing code as close to "machine language" or as close to "assembly language"
尽可能使(几乎)产生最快的代码.
as possible results in ( almost ) the fastest code being produced.
如果Microsoft的编码人员可以用二进制的1和0进行编码，或者他们知道为执行特定任务而要编写的正确字节顺序，我敢打赌，他们会的！！大声笑！但是，他们可能使用C编译器或/以及一些汇编语言".
If the coders at Microsoft could code in the 1's and 0's of binary or they knew the correct sequence of bytes to write to perform a certain task, I bet they would!! LOL!! However they probably use a C compiler or / and a bit of "assembly language".
我希望这会有所帮助. :)
I hope this helps. :)
.Net Framework代码有时令我感到惊讶，尤其是LINQ查询的速度. :-)
The .Net Framework code suprises me at times, especially with the speed of LINQ queries. :-)
C +或C ++(如果您正在谈论Visual C ++)，则可能更近
C+ or C++ ( if you are talking of Visual C++ ) it is probably closer
也要比VB.Net到标准C，因此速度差异也很大.
to standard C than VB.Net too, hence the speed difference.
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