Azure Cloud Service Web Role not starting - Unhandled exception - Unable to find Assembly

Question

I have an ASP.NET Web API hosted in a cloud service web role. I have added a WebRole class extending RoleEntryPoint which is attempting to retrieve an IoC castle Windsor container which has dependencies setup in the StartUp.cs of my web API. I want to then retrieve a logger instance I have registered and use that in my WebRole.

public class WebRole : RoleEntryPoint
{
    private ICancellationTokenSourceProvider _cancellationTokenSourceProvider;
    public override bool OnStart()
    {
        try
        {
            var container = IoC.GetContainer();
             _cancellationTokenSourceProvider = container.Resolve<ICancellationTokenSourceProvider>();
        }
        catch (Exception)
        {

            throw;
        }

        return base.OnStart();
    }

However when I try to deploy this to the cloud service I get the following exception:

Unhandled Exception: Unable to find assembly 'Castle.Windsor, Version=3.2.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc'. at System.Runtime.Serialization.Formatters.Binary.BinaryAssemblyInfo.GetAssembly() at System.Runtime.Serialization.Formatters.Binary.ObjectReader.GetType(BinaryAssemblyInfo assemblyInfo, String name) at System.Runtime.Serialization.Formatters.Binary.ObjectMap..ctor(String objectName, String[] memberNames, BinaryTypeEnum[] binaryTypeEnumA, Object[] typeInformationA, Int32[] memberAssemIds, ObjectReader objectReader, Int32 objectId, BinaryAssemblyInfo assemblyInfo, SizedArray assemIdToAssemblyTable) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWithMapTyped(BinaryObjectWithMapTyped record) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run() at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Remoting.Channels.CrossAppDomainSerializer.DeserializeObject(MemoryStream stm) at System.AppDomain.Deserialize(Byte[] blob) at System.AppDomain.UnmarshalObject(Byte[] blob) ' [2020-06-19T16:48:01Z] Last exit time: [2020/06/19, 16:48:05.617]. Last exit code: 0.

I have tried to find the cause and solution to this extensively.

I have tried to add binding redirects to the missing assembly in MyApi.dll.config and ensuring it is set to copy always.
I have also ensured the assembly has Copy Local set to true as well.

However, I still get this error every time and the web role keeps restarting trying to recover from this exception.

Give some suggestions, you can try whether it can be resolved, looking forward to your reply. — Jason Pan, Jun 22 '20 at 01:33

score 0 · Answer 1 · answered Jun 22 '20 at 01:32

Read your problem description carefully, I think the problem should be in the problem of loading assembly such as MyApi.dll.

First, because of the limitations of Azure's cloud environment, it may not be possible to load some third-party assemblies. You can refer to this post.

After the Azure Cloud Services service is created, you can get a virtual machine, and you can log in using RDP. So I suggest that you create your application first, do not contain the code that references the third-party .dll , to ensure the successful deployment. Then log in with RDP method to the virtual machine, open cmd, use the regsvr32 xxx.dll related command to register the third-party .dll file in the registry, and then redeploy your complete project now. Check if the problem is solved.

Azure Cloud Service Web Role not starting - Unhandled exception - Unable to find Assembly

1 Answers1