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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / Could not load file or...
Microsoft Dynamics AX (Archived)

Could not load file or assembly 'Microsoft.Exchange.WebServices

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Posted on by Ali R 1,040

Hi,

I have implemented a C# code to retrieve the unread email from Exchange by using Microsoft.Exchange.WebServices . I am going to call this C# class in AX and get the emails data. I consume C# class as reference into AOT but getting the below error while running this class-> method? 

System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Exchange.WebServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
File name: 'Microsoft.Exchange.WebServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
at ZonMicrosoftExchangeEmail.MicrosoftExchangeEmail.ReadUnreadEmails(String _EmailAddress, String _Username, String _Password, Boolean _MarkRead)

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Exchange.WebServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. 

at ZonMicrosoftExchangeEmail.MicrosoftExchangeEmail.ReadUnreadEmails(String _EmailAddress, String _Username, String _Password, Boolean _MarkRead)
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.Dynamics.AX.ManagedInterop.ClrBridgeImpl.InvokeClrInstanceMethod(ClrBridgeImpl* , ObjectWrapper* objectWrapper, Char* pszMethodName, Int32 argsLength, ObjectWrapper** arguments, Boolean* argsAreByRef, Boolean* isException)

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  • Suggested answer
    Ali R Profile Picture
    Ali R 1,040 on at
    RE: Could not load file or assembly 'Microsoft.Exchange.WebServices

    Yes. I was using EWS 2.0. After upgrading to 2.1, I don't get any error. Not sure why 2.0 was not working. BTW the problem has been solved. :)

  • Suggested answer
    Martin Dráb Profile Picture
    Martin Dráb 235,876 Most Valuable Professional on at
    RE: Could not load file or assembly 'Microsoft.Exchange.WebServices

    It's not a problem about locating the web service, it's about a .NET assembly. Adding a reference to AOT will make no difference - the application can't find the assembly at run-time.

    Try to identify the problematic assembly with Assembly Binding Log Viewer (it may be either Microsoft.Exchange.WebServices or another assembly referenced by it). Then decide where the assembly should be found and ensure that it's there - either in bin folder of the application (either AX client or AOS, depending on where you use the assembly) or in GAC on the right computer (client machine or AOS machine).

  • Ali R Profile Picture
    Ali R 1,040 on at
    RE: Could not load file or assembly 'Microsoft.Exchange.WebServices

    This happens only when I call this C# class from AX. I consumed this class in another C# project and it works fine.

    I also added Exchange Web Service into reference in AOT, but still getting error. Should I do anything in C# side to embed the web service. ?  

  • Suggested answer
    Community Member Profile Picture
    Community Member on at
    RE: Could not load file or assembly 'Microsoft.Exchange.WebServices

    it seems as if you C# class which you created in .net and referenced in AX in not able to find the webserivce which you are using.

    i suggest you should also reference the web service in dynamics AX.

    Please verify and update us with your further findings

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