net v4.7 is not supported?

[wrjanan]

I have a program that runs 2 different versions

1. 4.5.2
2. 4.7

The portion that works with AWS is:

var fileTransferUtility = new TransferUtility(S3Client);

Expected Behavior

Program should run successfully and transfer files for multiple versions

Current Behavior

Everything runs smoothly on v4.5.2

On v4.7 however, I receive this error message on the specific line that initiates

new TransferUtility(S3Client);
Exception thrown: 'System.TypeLoadException' in AWSSDK.CognitoIdentity.dll

While S3Client is a staticinitiated file:

private static IAmazonS3 S3Client
        {
            get
            {
                if (_s3client == null)
                    _s3client = new AmazonS3Client(Credentials, Region);

                return _s3client;
            }
        }


private static AWSCredentials Credentials
        {
            get
            {
                if (_credentials == null)
                    _credentials = new CognitoAWSCredentials(IdentityPoolId, Region); // errant line

                return _credentials;
            }
        }

Possible Solution

Am not quite certain, possibly a nuget version that has the v4.7?

Context

Am trying to get AWS to work on both net versions of v4.5.2 and v4.7 build configurations

Your Environment

• AWSSDK.Core version used: 3.3.103.42
• Service assembly and version used: 64 bit
• Operating System and version: Windows 10
• Visual Studio version: 2019
• Targeted .NET platform: v4.5.2 & v4.7

[wrjanan]

Finally fixed this issue!

What happened was with the 4.7 .net framework, somehow the assembly being loaded was already being used by a program that was loading my plugin. Since it was being loaded already, the debugger module window showed a totally different version that wasn't referencing the assembly that I had built.

            List<string> assemblies = new List<String>() {
                "AWSSDK.S3.dll",
                "AWSSDK.Core.dll",
                "AWSSDK.CognitoIdentity.dll",
                "AWSSDK.SecurityToken.dll"
            };
            string folderPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

            foreach (string assemblyName in assemblies)
            {
                string assemblyPath = Path.Combine(folderPath, assemblyName);
                if (!File.Exists(assemblyPath))
                    continue;
                Assembly assembly = Assembly.LoadFrom(assemblyPath);

            }

Now the assembly that is loaded is referencing from the right path and is working!