运行Windows Phone 8应用程序时出现System.IO.FileNotFoundException错误

Question

I have a Windows Runtime Component that uses some native libraries ( the PJSIP library ). This component is used in a Windows Phone 8 Application and when I try to invoke a function from the native component I get the following error:

An exception of type 'System.IO.FileNotFoundException' occurred in TestingApp.DLL but was not handled in user code

with the Source (at Exception Details) in mscorlib.

Can anyone point out what may be causing this error and how can I find out what is missing actually? When I try to put a breakpoint in my Windows Runtime Component, at runtime, the breakpoint appears as disabled.

Regards, Tamas

Answer 1

Add the missing dll to the project (like adding a new file) and mark it as content. Then reference the dll from this location. This may resolve your problem.

I guess it is not working as it is not being deployed within your application.

Answer 2

In Visual studio, under the debug menu select 'Exceptions' then in the dialogue that appears enable 'Thrown' for 'Common language runtime exceptions'

Then re-run your application, Visual Studio should break now at the line in the code that is causing the Null Exception.

Answer 3

If you reference a native library, double-check if you also reference C++ Runtime. Under your project in Solution Explorer, right-click References > Add Reference... Go to Extensions and check Visual C++ Runtime Package.

Answer 4

Check the library file you linked, it should be a import library for DLL file.

An import library (.lib) file contains information the linker needs to resolve external references to exported DLL functions, so the system can locate the specified DLL and exported DLL functions at run time.

When app start it find DLL files according to the import library, but there is no such DLL files, so C# throw a FileNotFoundException. Make sure link to a static library