当我动态加载程序集,然后从中调用一个方法时,我似乎是在调用它的方法中的代码之前从Assembly执行方法。它似乎没有像我预期的那样以串行方式执行。任何人都可以阐明为什么会发生这种情况。下面是一些代码来说明我看到的内容,some.dll程序集中的代码调用名为PerformLookup的方法。为了测试,我将类似的MessageBox类型输出与“PerformLookup Time:”作为文本。我最终看到的是:
First: "PerformLookup Time: 40:842"
Second: "initIndex Time: 45:873"
Imports System
Imports System.Data
Imports System.IO
Imports Microsoft.VisualBasic.Strings
Imports System.Reflection
Public Class Class1
Public Function initIndex(indexTable as System.Collections.Hashtable) As System.Data.DataSet
Dim writeCode As String
MessageBox.Show("initIndex Time: " & Date.Now.Second.ToString() & ":" & Date.Now.Millisecond.ToString())
System.Threading.Thread.Sleep(5000)
writeCode = RefreshList()
End Function
Public Function RefreshList() As String
Dim asm As System.Reflection.Assembly
Dim t As Type()
Dim ty As Type
Dim m As MethodInfo()
Dim mm As MethodInfo
Dim retString as String
retString = ""
Try
asm = System.Reflection.Assembly.LoadFrom("C:\Program Files\some.dll")
t = asm.GetTypes()
ty = asm.GetType(t(28).FullName) 'known class location
m = ty.GetMethods()
mm = ty.GetMethod("PerformLookup")
Dim o as Object
o = Activator.CreateInstance(ty)
Dim oo as Object()
retString = mm.Invoke(o,Nothing).ToString()
Catch Ex As Exception
End Try
return retString
End Function
End Class
我在write方法的末尾添加了一个flush语句,即使我有一个StreamReader.Close()调用。结果相同。以下是我输入的调试语句的一些输出,以便进一步尝试和诊断。在initIndex我有
write(timestamp)
save(file)
write(save success)
write(saved value)
write(timestamp)
write(file create / file modified times)
sleep(5 seconds)
invoke(assembly method)
write(timestamp)
在装配方法中,我有:
write(timestamp)
sleep(5 seconds) //yes, two 5 second sleeps between write and read
read(file)
write(file value)
write(timestamp)
write(file create / file write times)
这是我的initIndex logfile输出:
17:732
True
A/P
17:732
5/17/2010 11:59:30 AM / 5/18/2010 7:49:17 AM
22:748
这是Assembly类logfile的输出:
12:670
CASH
17:685
5/17/2010 11:59:30 AM / 5/18/2010 7:41:20 AM
答案 0 :(得分:0)
日期时间不像您想象的那么精确,您可能只是看到了这种不完美。
答案 1 :(得分:0)
所以你把新的时间写回文件然后重新阅读?您是否正在刷新输出流以确保数据已写入文件而不是仅缓存为惰性写入?