Error Message 'Unable to Load One or More of the Requested Types. Retrieve the Loaderexceptions Property for More Information.'

Error message 'Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.'

I solved this issue by setting the Copy Local attribute of my project's references to true.

Entity Framework LoaderExceptions Unable to load one or more of the requested types

As the top line of the stack says:

Retrieve the LoaderExceptions property for more information.

You can find this by examining the exception in the debugger.

ReflectionTypeLoadException Unable to load one or more of the requested types

I had the exact same issue but the Assembly it was having issues with I didn't really care about.

I went from this (worked locally):

Type t = AppDomain.CurrentDomain.GetAssemblies()
              .SelectMany(a => a.GetTypes())
              .Where(a => a.FullName == clientEx.ExceptionType)
              .FirstOrDefault();

To this:

Type t = null;

foreach (Assembly a in AppDomain.CurrentDomain.GetAssemblies())
{
    try
    {
        foreach (Type type in a.GetTypes())
        {
            if (type.FullName == clientEx.ExceptionType)
            {
                t = type;
                break;
            }                                            
        }

        if (t != null)
            break;
    }
    catch (Exception) { }
}

System.Reflection.ReflectionTypeLoadException: 'Unable to load one or more of the requested types. Could not load file or assembly

So in my case the dll file Crijoya.Core was in a different format as the error says. After trying everything they said on other questions this is what worked for me.

I have a project with two class libraries like so

I made sure that in the properties of each of them the platform was Any CPU

And finally that on Tools I was using the 64 bit version for IIS Express for web projects

Azure table: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information

Is there a way to look at the LoaderException stacktrace.

You could use StackTrace class to trace exception in your project.

Or you could retrieve ReflectionTypeLoadException.LoaderException property to get more information about LoaderException.

Catch the exception in Code:

try
{
  // load the assembly or type
}
catch (Exception ex)
{
  if (ex is System.Reflection.ReflectionTypeLoadException)
  {
    var typeLoadException = ex as ReflectionTypeLoadException;
    var loaderExceptions  = typeLoadException.LoaderExceptions;
  }
}

At the moment, Under Property of the Project, Application -> Target Framework is running in .netStandard 2.0

Just some features in trigger types could use in Azure function v2 preview template:

For example, the BlobTrigger supports fine in v2. You could have a try to operate azure storage.

Create Azure function v2 preview:

Create BlobTrigger:

The Code in BlobTrigger:

public static class Function1
    {
        [FunctionName("Function1")]
        public static void Run([BlobTrigger("helloworld/{name}", Connection = "AzureWebJobsStorage")]Stream myBlob, string name, TraceWriter log)
        {
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
   "storage account connection string");
            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer container = blobClient.GetContainerReference("helloworld");
            CloudAppendBlob blob = container.GetAppendBlobReference("log2.txt");
            using (var fileStream = System.IO.File.OpenRead(@"D:\log.txt"))
            {
                blob.UploadFromStreamAsync(fileStream);
            }
            log.Info($"C# Blob trigger function Processed blob\n Name:{name} \n Size: {myBlob.Length} Bytes");
        }

}

The result in BlobTrigger:

So you'd better to choose the compatible platform version. More details please refer this article.

Azure Functions runtime 2.0 is in preview, and currently not all features of Azure Functions are supported.

Getting Error: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information

Needed to change ajax 4.5 to 4.0. and worked.

C# - Loading DLL Dynamic - System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types

Solution to the problem was quite easy. It is just using a different method from the assembly. Instead of using LoadFile, we should use LoadFrom

So the below code solves the problem efficiently

var assembly = Assembly.LoadFrom(assemblyInfo.FullName); // loads perfectly, absolute path to dll
var types = assembly.GetTypes(); // loads perfectly.

There is no need to use GetExportedTypes. We can get all the types.

LoadFrom does auto reflection binding with other DLLs, however, loadfile doesn't do the same.

Which resolves that export issue.

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