VS 2008 - System.Reflection.TargetInvocationException
Oct 3, 2009
I am trying to create an application that will play a movie file, then when it has played the movie, give the user 30 seconds then shut the system down. i have so far made it so that it does everything i need expect when the code for the additional 30 seconds is up i get the following error:
Quote:
An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll
Additional information: Exception has been thrown by the target of an invocation.
When i had a message box being made at the same point it worked fine but when i added the shutdown code in it doesnt work so i am confident it is not with the if statements but more the "Process.Start("shutdown /s /t 30")" line.
Private Sub timShutdown_Elapsed(ByVal sender As System.Object, ByVal e As System.Timers.ElapsedEventArgs) Handles timShutdown.Elapsed
If ShutdownTimer = 1 And ShutdownExtraTime = False Then 'Movie Has Played
ShutdownExtraTime = True
[CODE]...
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May 29, 2009
I get this error when I try to read data over the serial port using a program that I have written in VB.NET n unhandled exception of type System.Reflection.TargetInvocationException' occurred in mscorlib.dllAdditional information: Exception has been thrown by the target of an invocation.he code which I think causes this error is as follows :
Try
COMPort.Open()
Catch ex As Exception
[code].....
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Feb 11, 2012
I am making a program that is sort of a frontend to all my other apps. I put the EXEs of those apps into the resources of my frontend. The problem occurs when I try to run the EXEs from memory.
I keep getting System.Reflection.TargetInvocationException on the line:
entryPoint.Invoke(RuntimeHelpers.GetObjectValue(objectValue), New Object() {New String() {"1"}})
[code].....
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Feb 20, 2009
Nightmare error: System.Reflection.TargetInvocationException error in VB 2008
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Feb 6, 2010
I am working on a card game, and i get this werid error:
A first chance exception of type 'System.Reflection.TargetParameterCountException' occurred in System.Windows.Forms.dll
The code that is cousing this error is:
Private Delegate Sub ShowcardDelegate(ByVal test As String, ByVal objtest As Object, ByVal value As Boolean)
Private Sub Showcard(ByVal test As String, ByVal objtest As Object, ByVal value As Boolean)
If objtest.InvokeRequired Then
[code].....
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Jun 11, 2009
I have had several occasions recently to access a specific class several times over a relatively small time frame.So I've been storing the value of the class in Session and trying to access it on page load, if it's not available creating a new instance and storing that in session.
So instead of constantly replicating the same code for different classes on different pages I'm trying to create an extension method to do this for me.
[Code]...
I'm stuck on what to do when I make my new instance of my class (it would have to have a New() sub)
I'm not sure where to go from here... or even if this is the best way to do it.
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Jun 1, 2011
Im using system.reflection to inject a managed (.net) file directly into memory.This injection works with other managed files, but this file has data in the EOF and it wont run without that data.
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Mar 4, 2010
I am trying to determine every single reference inside a dll with System.Reflection. However, GetReferencedAssemblies only lists the ones in the "References" (visible in solution explorer).
I would like to determine references from within the code itself, such as an imports statement. Even things like if/then statements, try/catch, absolutely everything.
Is this possible to do using System.Reflection? If so, how?
I would definitely prefer to do this without p/invoke.
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Sep 15, 2011
I am trying to create an Excel file using reflection. The reason, the application will be running on many machines some of which may or not have excel installed. I decided to embed the "Microsoft.Office.Interop.Excel.dll" and via reflection generated the excel spreadsheet. The code I am trying to resemble is:
[Code]....
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Dec 5, 2011
I am loading an assembly dynamically and invoking a static method from it. The problem arises when the method uses a reference which is not trivial (e.g. mscorlib or System.Core) - I get System.MissingMethodException. I have tried going through the references assemblies of the loaded assembly and manually loading them all, thus forcing them to be loaded onto the AppDomain. I have checked CurrentDomain.GetAssemblies, the assemblies are loaded.
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Oct 3, 2007
I am working on a program that requires me to load 2 dll at runtime.My code is as shown below:
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Jul 31, 2011
so I want to go start using System.Reflection to load my dlls from a special folder as I never did this before and thought I should give it a try. now I'm wondering how to do this. below I have my dll code and my form code I need to know how to use the sub from my dll in my form if I use Assembly.LoadFrom
[Code]...
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Jul 15, 2010
I have an open source project I converted to vb.net. I solved all the errors, except for one. This is the C# line
[Code]....
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Oct 24, 2011
I cannot get the following to work for me: its the section that sets the default for system.data.linq.binary. The database I work with doesn't allow nulls in any field. So I generally run my buffer through this routine to populate defaults and then set the real values independently, (this works when I miss a field). I can set the Linq table field = fakeBinary and it works like a charm. Thus, I don't understand why using reflection can't pull of the same thing.
Ex: Me.CM20500WindowBuffer.Reconcile_Messages = New Byte() {0} works.
Try
Dim fakeBinary As System.Byte() = {0}
For Each fld In nObj.GetType().GetProperties
Select Case fld.PropertyType
Case GetType(Byte)
[Code] .....
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Jan 29, 2010
I'm passing a type name and some parameters from C# code into a navigation framework written in VB. The navigation framework looks for a constructor on the type that matches the parameters passed in using Type.GetConstructor(Types()). The constructor that I'm looking for expects an array of integers Integer() in vb. But it gets an array of System.Int32. I've gone so far as to try this:
[Code]...
And the VB code still sees System.Int32 on the other end, which means that it doesn't find the constructor.
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Dec 14, 2010
I have tried several versions of this with no luck. The casting of the worksheet works as my data is entered in other parts, but I have a section where I need to add data 1 column right of the cell containing the 'str(0)' value. Most of these parameters are optional. I have even tried the System.Reflection.Missing object.
[Code]...
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Jan 15, 2007
Our company has an app that load their components by System.Reflection.Load (By the way, an awesome technique )But, we start to monitorate the application and detect a extrange grow up of memory (actually when our application still all day on air, their allocate memory on task manager is 200 MB plus memory) And all of our components (60 plus DLLs) is load by this technique.My doubt is how to deallocate this assemblies or how the best way to deallocate any assemblies loaded by the System.Reflection.Assemblie.Load method?
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Aug 31, 2010
I am developing a COM dll library, and I have a little vb.net (vs 2005) application just to test it.I had my object declared in the application as
Private m_VarName As MyLib.CMyComClass
So far, so good.But now, I need an event to inform the application of some things, so I implemented such event in the COM dll, and changed the declaration to
Private WithEvents m_VarName As MyLib.CMyComClass
So far, so good, again. But if I add a Sub to handle my event:
Private Sub m_VarName_OnCaptureStop() Handles m_VarName.MyEvent
..
End Sub
The first time I create the object, nothing bad happens, but if I reinstantiate it
If (Not m_VarName Is Nothing) Then ReleaseComObject(m_VarName)
m_VarName= New MyLib.CMyComClass
then I get a cryptic TargetInvocationException, seemingly related to reflection (which, AFAIK, I am not using).If I remove the "Handles m_VarName.MyEvent" part, everything seems to work. In case it matters, I am not firing any event, for now.
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Aug 19, 2009
I'm trying to download a file from my server, but it's giving me a the exception. Seems I'm doing something wrong, but I can't figure it out. HDIT: Also found this message: Value of 7 is not valid for Value. Value has to be between 'minimum' and 'maximum'
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Mar 30, 2009
I am reference DLL files programming in my application. My question is once they have been called and used is there anyway to "un-reference" them so I can move them?
CODE:
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Nov 16, 2009
I have various projects that use reflection to access and invoke private or internal members in some of the framework classes. These projects all work fine on my machine (running visual basic express 2008), but are they guaranteed to work on another machine, or, say, over a network? I've had a look at Reflection-Permission, but I'm not sure if I need that granting to me or if I grant it to my project!
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Sep 11, 2009
I wonder if anyone can help me - I've not done much with reflection but understand the basic principles.What I'm trying to do:I'm in the process of developing a class that gathers a lot of information about the local system, network, etc... to be used for automated bug reporting. Instead of having to change my test harness every time I add a new property, I'd (ideally) like to be able to serialise the lot as an XML string and just display that in a textbox.
Unfortunately, the Framework won't use the default XML serializer on read-only properties (which almost all of mine are) as they wouldn't deserialize properly [Not sure I agree with the assumption that anything serialized must be de-serializable - MS says this is a feature "by design" which I suppose I can understand - Perhaps a tag to indicate that it should be serialized anyway would be advantageous?]
The initial approach was to make properties gettable and settable (with a throw exception on the setter) but the amount of work tidying this up afterwards seems a little excessive and I would want the properties to be read-only in the final version.What I need help with:My current plan is to use reflection to recursively iterate through each (public) property of my topmost gathering class. The problem is, the samples I've seen don't handle things recursively. Additionally, I only want to inspect an object's properties if it's in one of my assemblies - Otherwise just call .ToString on it.
If I don't have the inspection limited to my assembly, I assume I'll get (say) a string which then contains a Length which in turn will have .Tostring method.For the purposes of this project, I can almost guarantee no circular references within my code and as this will only be used as a development tool so I'm not too concerned about it running amok now and then.
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Sep 24, 2009
I have found a lot of articles about Reflection and know how to create a class. I'm practicing how to work properly with the reflection to create a module/plugin-based application.So I found a simple example which is working great, but it isn't dynamic enough, 'cause it is hard-coded. I need to read all the .dll's from the application.startuppath & "modules" & *.dll and get there names (without the .dll).Code is was testing for practice returns the form (I know that this is not the correct way to call the dll dynamically):
vb.net
Imports System.Reflection Public Class Form1 Private Sub cmdOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdOK.Click Dim assemblylink As [Assembly] assemblylink = [Assembly].LoadFrom(Application.StartupPath & "/" & "LoginAssembly.dll") Dim LoginFrm As Form LoginFrm = assemblylink.CreateInstance("LoginAssembly.Login") LoginFrm.Show() End Sub
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Jan 28, 2010
I have a utility that is a simple exe that is not installed compiled with VS2005 and works well. But when I upgraded to VS2008 the utility can no longer locate files in the active system folder. I have UAC turned off and am logged in as the Administrator and it still can not locate a file that I can see in Windows Explorer. The file I am looking for is PakMgr.exe.
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Nov 2, 2009
I'm trying to use DataView.Rowfilter and I'm getting an exception which says "Cannot perform 'Like' operation on System.Int32 and System.String".
Here's the code...
Dim str2 As Double = CDbl(searchSTR)
Me.shipperDV.RowFilter = fieldName & " LIKE '*" & str2 & "*'"
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Feb 15, 2010
I have finished coding an application which I designed for people working in my office. When I started to install the application to computers at the office, I realized that, in some machines, application doesn�t work properly. Although it worked for 15 computers perfectly, for 3 computers following error code is displayed:
System.IO.FileNotFoundException: Could not load file or assembly 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.
[code]....
WRN: Assembly binding logging is turned OFF.To enable assembly bind failure logging, set the registry value [HKLMSoftwareMicrosoftFusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.To turn this feature off, remove the registry value [HKLMSoftwareMicrosoftFusion!EnableLog].
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Feb 12, 2011
A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll It displays in my Immediate Window when i run my program, I'm using a text reader to read a number of XML files using background worker...most the time it stops so something is wrong but sometimes it works fine.
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Sep 27, 2008
I am trying to perform a simple bound connection between an Access database and a text box on a form. This is actually Chapter 18 of the "Microsoft Visual Basic 2008" book.I get the same error message when trying to create my own project "MY ADO Form" or the "ADO Form" project supplied from the DVD provided with the book. I am running the 90 Day Trial Version of Visual Studio 2008 with SP1 and Net 3.5 SP1.
My operating system is the 64 bit Version of Vista with all updates.The error when I try to run the application in the debug mode is:"A first chance exception of type 'System.InvalidOperationException' occurred in System.Data.dll"and as a result no data shows up in the text box from the database and the data selection bar is grayed out in the form. The underlying database "Students Data Set" appears to be fine as I have seen the correct data for the fields "Instructor" and "PhoneNumber" prior to running the program and when connecting with the database.
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Oct 20, 2010
I have a bit of trouble right here, I am trying to get the data from the site and input them in the listview. Well, when my main app start to load through on debug, then it start to display a warning. The warning is: Unable to cast object of type 'System.String' to type 'System.IFormatProvider'.
[Code]...
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Jun 15, 2009
I'm wondering what exactly is the difference System.Timers.Timer and System.Windows.Forms.Timer???
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