I have a c++ dll, and an idl file that was used to generate a .winmd file.
I created a C# application that consumes the .winmd file and I can successfully create an object for a class that was defined in the dll. i.e the program compiles and runs without any issues.
However, when I try and use the same exact winmd file (which works when consumed by a C# application) for a C# Asp.net web app (i.e I add a reference to the winmd file and I see that the winmd file and dll are copied into my web apps bin folder), I get a runtime exception saying:
"Could not find Windows Runtime type [Name of class]"
When I use Fusion Logs to see what went wrong when the application was attempting to load the dll, I see this:
END : Typename or Namespace was not found in metadata file. (Exception from HRESULT: 0x8000000F)
So my question is, what is the main difference between loading a native dll in a C# application vs an Asp.Net application?
Related
I have .NET 5 project which includes C++/CLI DLL, which includes C++ DLL, which includes opencascade DLLs. All these projects are built for the x64 platform. I've published this solution to my local folder and then set up IIS server everything works fine. But when I've tried to upload my project to two different hostings (https://www.smarterasp.net/ and azure) I've got this error. Project crashes when it starts use C++/CLI dll(using namespace C++/CLI). I've also set up x64 platform in azure portal.
I would appreciate any help.
Thank you Joe. Posting your suggestion as an answer to help other community members.
Project crashes because of missing DLL. Run the app and get the error.
Go to the Windows Event Viewer (Start Menu and type "Event"). In the EventViewer, under Windows Logs >> Application, you might see an error message regarding the failure. If the error is a missing DLL, it will typically tell you the name of the DLL as well.
You can refer to Could not load file or assembly ... An attempt was made to load a program with an incorrect format (System.BadImageFormatException), Troubleshooting BadImageFormatException and System.BadImageFormatException An attempt was made to load a program with an incorrect format
I was able to create single exe for my WinForm app using Costura and Fody (Any CPU .NET 4).
All dll files used in my project are placed in a 'dll' folder inside project. And Build Action of each dll is set to none. Then each dll in this folder is added as a reference.
Now I want to add Aforge.Video.FFMPEG.dll as reference and did as above. But when running the app it shows an exception :
System.IO.FileLoadException: 'Could not load file or assembly 'AForge.Video.FFMPEG, Version=2.2.5.0, Culture=neutral, PublicKeyToken=03563089b1be05dd' or one of its dependencies. Attempt to load an unverifiable executable with fixups (IAT with more than 2 sections or a TLS section.) (Exception from HRESULT: 0x80131019)'
Finally I found that FFMPEG has 8 native dlls and this files should put in bin/Release folder along with Aforge.Video.FFMPEG.dll. Then I can only run the app.
Also Fody not embedding those native dll.
How can I embed this FFMPEG to fody to create a single exe file?
I have a C++ DLL library (let's call it unmanaged.dll) that gets wrapped around a managed .NET library (let's call it managed.dll). The managed.dll uses unmanaged.lib to import/link unmanaged.dll. I have another ASP.NET Web API project that uses managed.dll (let's call the project webapi.dll). Now, whenever I build the Web project, in the output directory I get webapi.dll and managed.dll. Then, I manually copy unmanaged.dll to be in the same output folder so that (presumably) .NET can locate it and load it.
However, when I try to run webapi.dll, it fails with an error that it cannot load managed.dll:
Could not load file or assembly 'managed.DLL' or one of its dependencies. The specified module could not be found.
This is particularly weird because unmanaged.dll is in the same folder.
What I find very weird is that if I put unmanaged.dll under C:\Windows\system32 then .NET can properly load it!
My question is how can I make this unmanaged.dll visible to .NET in the folder where the .NET project output is residing?
It's the IIS that is causing the problems. Had the same problem, sovled it by adding the dll to a folder, that lies in the PATH variable.
I am using a Visual Studio 2017 Community Version to develop a console application using Reflection. I want to analyse the dll file of Windows.UI.Notifications using Reflection.
However, when I try to load the dll file using Assembly.LoadFrom("path") , the program throws an error given below.
System.BadImageFormatException: "Could not load file or assembly '(path)' or one of it's dependencies. The module was expected to contain an assembly manifest."
I am working on a Windows 10 64 bit system. I have tried loading the dll from System32 folder , SystemWOW64 and also from ProgramFiles(x86) directly. I also tried to copy the dll from these folders to a different folder. But each time the error is thrown while loading the assembly. I am able to load Xamarin dlls using the same methods.
In order to use Assembly.LoadFrom(path), dll file must be .Net assembly but in your case Windows.UI.dll is not a .Net assembly but native code. You can not use Assembly.LoadFrom(path).
If you want to use Windows.UI.dll in your .net application please refer to this page
I created two projects. They are VB.Net dll and c# .net dll file. I am using VB.net dll file into c#.dll file. when i test c#.net dll file it is giving error message Could not load assemble. if i use both then it is working fine.But i have to use only one dll file.
Let me know how can i do with only c#.net dll file.
In .NET a project denotes the bounds of the resulting assembly. So if you want a single .dll you will need to put everything in a single project.
You have the additional task in your case of making everything the same language as you can't mix VB.NET and C#.NET in a single project.