Method Not Found When Loading Assembly
Aug 3, 2009
I am getting a
"Method not found: 'Boolean MyCompany.LibraryAssembly.SomeFunction (System.String)'"
Exception/error when running a VB.NET console application. The method is part of an external assembly and it is definitely in the assembly. The error only occurs at runtime when I go to enter the function that calls the method. I have the assembly referenced by my project and I am not copying it locally. Intellisense shows no errors, and neither does the compiler. I am loading the assembly statically not dynamically. I reference the from a local folder (not the GAC) although the same version is also available from the GAC.
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Apr 2, 2012
I am loading an Assembly using Assembly.LoadFrom() as the assemblies are located in a different path from Application Base directory.
Dim oAssembly As Assembly = _
Assembly.LoadFrom("C:\MyFolder\" + ddlXlate.SelectedItem.ToString() + ".dll")
And I consume a Type from that assembly without any problem:
oXML = CType(oAssembly.CreateInstance(sBaseType + ".XlateContainer"), _
XlateBase.XlateContainer)
However, the problem occurs when I try to use a Type from this assembly from within another method like the one below:
oComboBox.DataSource = _
[Enum].GetValues(Type.GetType(sType + "+ItemEnum," + sAssemblyName))
sAssemblyName is the one I loaded using LoadFrom() actually. After it said it cannot find the assembly, I used AssemblyResolve event which solved my problem :Subscribing AssemblyResolve event :
AddHandler AppDomain.CurrentDomain.AssemblyResolve, _
AddressOf MyResolveEventHandler
Event Handler Method:
Private Shared Function MyResolveEventHandler(ByVal sender As Object, _
ByVal args As ResolveEventArgs) As Assembly
Return Assembly.LoadFrom("C:\PSIOBJ\" + args.Name + ".dll")
End Function
And I thought maybe the error occurs because it cannot find a dependent assembly defined in assembly manifest file I loaded using LoadFrom() already but when I checked the args.Name, I saw it was trying to load same assembly and after that it worked without any problem. So basically a type in the loaded assembly cannot be found before the event adding change.
My old code was using AppDomain.CurrentDomain.Load() and Assembly.Load() methods and they were working fine without the AssemblyResolve event. I was able to reach types in dynamically loaded Assembly from every where within the same AppDomain.
LoadFrom() can find dependencies automatically within the same requested assembly path and that couldn't be problem as everything this dll needs was there. So at first it looked like a AppDomain problem to me as it looks like it seems it can reach assemblies from Load context instead of LoadFrom context and I am now using LoadFrom context.But now it seems I should pass oAssembly instance evertwhere to use any type from the loaded assembly?Doesn't it load the assembly where I can reach it everywhere (same AppDomain) using simple Type.GetType(...) method?
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Jun 9, 2009
When I am loading an Assembly dynamically, then calling a method from it, I appear to be getting the method from Assembly executing before the code in the method that is calling it.It does not appear to be executing in a Serial manner as I would expect. Can anyone shine some light on why this might be happening. Below is some code to illustrate what I am seeing, the code from the some.dll assembly calls a method named PerformLookup. For testing I put a similar MessageBox type output with "PerformLookup Time: " as the text. What I end up seeing is:
First: "PerformLookup Time: 40:842"
Second: "initIndex Time: 45:873"
Imports System
[code].....
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Mar 7, 2012
After finish my software, when I was try to run in other computer the error was: Don't possible to get the file or assembly 'ADODB, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f711d50a3a'...How the best solution for this error? Just to put the last adodb.dll in the application folder?
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Jun 9, 2011
What's the meaning of this error? The first version the I had installed is the vb. 2008 express edition. Now I try to used the vb.net2008 team system. Is there any conflict with those versions that I had installed to my pc?
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Jan 23, 2012
VS2008 / XP Pro sp3 / .NET 3.5 I develop during the day on my office computer and bring home projects on a laptop to work on over the weekend. After working at home then at work, I have a conflict that I don't understand. When I build, all is normal but when I debug, I get "Found conflicts between different versions of the same dependent assembly." If I click on the warning message I also get "Do you want to fix these conflicts by adding binding redirect records in the app.config file"?Both computers have same O/S, same SP, same .NET, same VS. Only thing that could be different is particular O/S updates that have been installed on each machine. What causes this warning and where do I look for differences? I really hate to let mSoft keep changing my code every Saturday and Monday. I just don't trust it on Mondays.
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Aug 4, 2009
I have created a strong name key file and run the gacutil to attach the dll to the assembly.. When i try to run the regsvcs bankaccounts.dll i get the following error...
Invalid ServicedComponent-derived classes were
found in the assembly.
(Classes must be public, concrete, have a public[code].....
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Jun 18, 2008
i am writing a simple games client using an XNA 2.0 engine to play games. The games are written in dll files and the client uses the assembly.loadfrom method to read and execute the games accordingly...Now this all works fine on my computer and my laptop. However when i give it to my friend he gets this error and the dll doesnt load - "Unable to load one or more of the requested types. Retrieve the loader exceptions property for more information"
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Dec 20, 2011
I now have a need to dynamically load a dll into my application and I've found the reflection/assembly information and it's fairly easy to implement so I thought I was on my way. However, I quickly found out that I'm only able to use 'shared' methods. What I was originally thinking was I could have one shared method 'library.beginprocess' and then that would make all the necessary calls to the other methods, but this doesn't work unless all the other methods and class level objects are also shared.
I feel like I'm missing something or somethings just going right over my head. I've looked at many, many sites and examples, but I've only run across examples that expose 1 method,[URL]..which explain how to implement a plugin architechture, which I have not tried yet, but maybe would allow me to keep my class structure the same without having to make everything shared?
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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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Apr 26, 2011
My program requires that a picturebox change its image during run time. I've used:
PictureBox1.ImageLocation = [file location]
PictureBox1.Image = Image.FileFrom([file location])
Both work fine, usually.
[code].....
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Dec 8, 2011
I set a background image to my project. When I run it, It comes with an error, file not found:
Could not load file or assembly 'System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.. I do have the file, and I didnt move places. I still have it and also reloaded it in the resources.
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Sep 25, 2010
AFAIK, there're 3 methods to load an assembly into a AppDomain:
Assembly.Load()
Assembly.LoadFrom()
Assembly.LoadFile()
The LoadFrom() method takes the assembly filepath as its argument, but the filepath is merely providing the assembly identity information as a clue to the CLR. The LoadFrom() method still internally calls Load() with that identity information. So it is quite possible that LoadFrom(filepath) will load a totally different assembly from the one specified by the filepath. But the tame LoadFile() method will just load the assembly we specified.
I am wondering why do we need the LoadFrom() method? It adds nothing but confusion and pitfall. Is there any scenario that only LoadFrom() is applicable?
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Apr 25, 2012
I have 1 exe and 1 dll. The dll (ClassLibrary1) file is located in the root of a website. In the dll I have a UserControl that populates with data its controls, from a database that is on a website too. The end user gets the exe file. This exe loads the dll and displays the UserControl1 on the form. This is how i load the control from inside the dll (located on the web site), on my form (exe file).
Private _dll As String = "http://www.site.com/ClassLibrary1.dll"
Private _class As String = "ClassLibrary1.UserControl1"
Private WithEvents cont As UserControl
[code]....
The error is "Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed."Note that if i dont load the usercontrol from the web and instead have it locally, there is no problem. The data are fetched from the database (db is on the web) with no problem.The problem seems to be that the loaded assembly from the web (the usercontrol1 inside the dll) has no permission to access anything. I am not trying to access stuff from the user's pc (like file IO), but access a database located on a web server.
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Mar 11, 2010
Assume a .NET class library code that, for example, writes to the Windows registry. Then this code has problem to run over internet, because default Internet policy does not give access to write to the registry.By adding a RequestMinimum statement in the assembly we can specify that the code requires permission to write to write to the registry. This will not alter the fact that the code does not have the permission, but will stop the assembly from loading; the runtime will throw a System.Security.Policy.PolicyException and identify the permission that is required.Do you now any other examples of using evidence, security policy and permissions (the key elements of code-access security) to prevent an assembly from loading on a web server?
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Aug 9, 2010
I'm returning to my old question since I've never been able to find an answer.
For example I have a class library A with a method Method, is there a way to load this assembly from my application B and execute this method (A.Method) without putting a reference to assembly A?
My idea isn't that the idea behind System.Reflection?
So far, I can only load the assembly, I can even enumerate classes, members, etc, but I cannot figure out how to invoke methods and read property values.
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Jan 5, 2011
First let me say: I am still very inexperienced with VB.NET so there is probably something simple I am missing, or at least that's what I'm hoping. I've been writing a COM exposed wrapper class to provide access to a web service in a legacy VB6 application. I got everything pretty much working as I wanted - all the COM properties, methods and events are showing up in the VB6 app - but for one minor detail: when I used a method which made a call to the service, it was obviously only working asynchronously, so I couldn't update a progress bar or do anything else while waiting for a corresponding assembly event to fire.
[Code]...
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Mar 11, 2011
Is there any class or specific method for getting non-primitive types in an assembly? FieldInfo.Gettype() will do for primtive types but what about non-primitive types?
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Nov 11, 2010
I am trying to use a simple LINQ to Objects query.When I try to run my application I get the message:
System.InvalidOperationException was unhandled Message="An error occurred creating the form. See Exception.InnerException for details. The error is: Method not found: 'Void sharatTashlumimWS.paymentDetailsManager.set_ReleaseDate(System.DateTime)'."
Source="WindowsApplication1"
StackTrace:
[Code]...
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Jan 2, 2012
I am getting an error when I try and run my service. I made sure everything in the project is VB .NET 2.0.This service used to work, but we have been making code updates... I did some research but I do not see anything relevant. Does this error mean that my function cause the issue? Or is it the List that is the issue?
[Code]...
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Apr 25, 2011
I have:
Namespace Model.Object.Interface.Object
Public Interface IObject
Property Id As Integer
Property Id_Parent As Integer
Property Name As String
[code].....
Why throw this exception? How to fix?
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Mar 17, 2012
Private Sub setView()
With lvwLogs
.AllowColumnReorder = True
.FullRowSelect = True
.GridLines = True
[code]...
I am getting the same compile error for the forms with setview. I am thinking it concerns with listview. It highlights the public sub setview().
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Nov 6, 2011
I'm making a notepad and i added find method to find the string and i programed the code but when i search some string in the text box the found string not be shown until i will scroll the text box to see it
it's not auto select or auto go to found text
so how can i do this and my code is Imports System.Text.RegularExpressions
[Code]...
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Nov 24, 2010
For example, assume that in my assembly, in Namespace A, Class B, there is an instance method with the following signature: void Test(string someString, int someOtherParm, string someOtherString ); This method is called multiple times, from multiple places in the assembly. I would like to be able build a list of all invocations of this method and the value of the someString/someOtherString (assuming they are hardcoded). In other words, I like to extract a list of calls like the example one below, if they happen in the assembly somewhere: Test("some text", 8, "some other text");
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Jan 4, 2011
I am trying to read all selected items from a listbox in Visual Basic.
Dim x As Integer
Dim testValue As String
testValue = "20"
[code]....
is the code I am trying. But When I run the code, I am getting "Compile error : Method or data member not found" I guess I am missing some references to use "ListBox.Items" method right?What is the required references/library.
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Apr 18, 2012
When I start my application I get the following error:
method not found microsoft.visualbasic.msgboxresult
I have tried repairing my .NET installation.
Note: This error only occurs on one machine. On every other machine it works fine which makes me think something with the .NET assemblies was corrupted. It was working fine on the broken machine a few days ago.
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Jan 18, 2012
I want to open a notepad file using VisualBasic.Interaction.Shell method. At present I get a file not found exception using the following code.
int pid = Interaction.Shell(@"D:abc.txt", AppWinStyle.NormalNoFocus, false, -1);
But this works:
int pid = Interaction.Shell(@"notepad.exe", AppWinStyle.NormalNoFocus, false, -1);
[code].....
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Jan 6, 2010
I know there is a function Contains that returns true if string has a certain substing in it. But is there a function that returns the count of instances of that substring inside another string.
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Feb 25, 2010
I found a custom ListBox that, strangely doesn't have an InsertAt method and I would like to add one. The custom ListBox uses an object instead of just a list of strings like a normal ListBox. I was curious what the logic behind inserting a new item at a particular index would be.The only thing I could come up with was add the new ListBoxItem at the end, then using the specified index, I could either keep moving ListBoxItem objects to the bottom, with the Add() method, from that index till the ListBoxItem at that index equals the one added, or I could use that index number in a "calculation" till I know I've moved the correct number of objects.
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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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