当我动态加载程序集,然后从它调用一个方法时,我似乎从调用它的方法中的代码之前获取Assembly执行的方法。它并不像我所期望的那样以串行方式执行。任何人都可以点亮一下为什么会发生这种情况。下面是一些代码来说明我所看到的,来自some.dll程序集的代码调用名为PerformLookup的方法。对于测试,我将类似的MessageBox类型输出与“PerformLookup Time:”作为文本。我最终看到的是:VB .Net - 反射:在调用方法之前,从加载的程序集反射的方法执行。为什么?
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
我添加了一个冲洗声明我写方法的末尾,即使我有一个StreamReader.Close()调用。相同的结果。下面是我放入的一些调试语句的输出,用于进一步尝试和诊断它。在initIndex我
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)
而在装配方法,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)
这里是initIndex日志文件我的输出:
17:732
True
A/P
17:732
5/17/2010 11:59:30 AM/5/18/2010 7:49:17 AM
22:748
这里是从Assembly类输出日志文件:
12:670
CASH
17:685
5/17/2010 11:59:30 AM/5/18/2010 7:41:20 AM
在实际的代码中,我试图从文件中读取值。我更新调用方法中的值,然后在Assembly方法中读取它。 Assembly方法正在从文件中提取前一个值。当我通过Assembly类查看文件上的编辑时间戳时,我发现它没有被调用方法更新。 – 2010-05-17 21:04:43