Cannot Get DynamoDB record when model inherits from base class with member with the same name about aws-sdk-net HOT 8 CLOSED

We have released a fix for this bug today.

Please use the new package versions and try again:
AWSSDK.Core: 3.7.304.19
AWSSDK.DynamoDBv2: 3.7.303.25

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Hello @alvaromon,

Thank you for reporting the issue. Using below code sample I am able to reproduce the InvalidOperationException that you mentioned.

using Amazon.DynamoDBv2;
using Amazon.DynamoDBv2.DataModel;

namespace DDB_LoadAsync_3343
{
    public class Program
    {
        public static async Task Main()
        {
            Amazon.AWSConfigs.LoggingConfig.LogResponses = Amazon.ResponseLoggingOption.Always
            Amazon.AWSConfigs.LoggingConfig.LogTo = Amazon.LoggingOptions.Console;
            Amazon.AWSConfigs.AddTraceListener("Amazon", new System.Diagnostics.ConsoleTraceListener());

            var client = new AmazonDynamoDBClient();
            DynamoDBContext context = new DynamoDBContext(client);

            var d = new MyClass { Number = "3.7.302", Addresses = new List<string>() { "add1", "add2" } };

            await context.SaveAsync<MyClass>(d);

            var loaded = await context.LoadAsync<MyClass>(d.Number, d.Addresses);
        }

        private class BaseClass
        {
            public string Number { get; set; }
            public IList<string> Addresses { get; set; }
        }

        [DynamoDBTable("OverrideBase")]
        private class MyClass : BaseClass
        {
            [DynamoDBHashKey]
            public new string Number
            {
                get => base.Number;
                set => base.Number = value;
            }
            public new List<string>? Addresses { get; set; }  
        }
    }
}

I am able to reliably reproduce this error with AWSSDK.DynamoDBv2 3.7.300 onwards. I will review this issue with the .NET SDK team to investigate it further. We shall keep you posted.

Hi @YuriiMocherniuk,

The error you mentioned looks similar. Can you provide code sample for your use-case? Also, I don't see the package version for AWSSDK.DynamoDBv2 in the screenshot that you shared.

Regards,
Chaitanya

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We are currently working on a fix for this issue.

from aws-sdk-net.

thank you to the team. That was very fast!

from aws-sdk-net.

I'm having a similar issue, also on .NET 8:

System.InvalidOperationException: Dictionary already contains item with key Usage
   at Amazon.Util.Internal.InternalSDKUtils.AddToDictionary[TKey,TValue](Dictionary`2 dictionary, TKey key, TValue value)
   at Amazon.DynamoDBv2.DataModel.StorageConfig.GetMembersDictionary(Type type)
   at Amazon.DynamoDBv2.DataModel.StorageConfig..ctor(Type targetType)
   at Amazon.DynamoDBv2.DataModel.ItemStorageConfig..ctor(Type targetType)
   at Amazon.DynamoDBv2.DataModel.ItemStorageConfigCache.CreateStorageConfig(Type baseType, String actualTableName, DynamoDBFlatConfig flatConfig)
   at Amazon.DynamoDBv2.DataModel.ItemStorageConfigCache.GetConfig(Type type, DynamoDBFlatConfig flatConfig, Boolean conversionOnly)
   at Amazon.DynamoDBv2.DataModel.BatchWrite`1..ctor(DynamoDBContext context, Type valuesType, DynamoDBFlatConfig config)
   at Amazon.DynamoDBv2.DataModel.DynamoDBContext.CreateBatchWrite[T](DynamoDBOperationConfig operationConfig)

Do you think its origin is the same? Previously before .NET 8 and AWS NuGet packages upgrade we haven't been facing such problem.

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Extra information: the issue started to occur after the following NuGet package upgrade:

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Hi @bhoradc,

Actually, we had several NuGet packages referenced in other projects and the AWSSDK.Core, AWSSDK.DynamoDBv2 packages probably got referenced here as transitive dependencies (they haven't been referenced in this case explicitly).

As for the code that throws exception, overall it looks as follows:
var batch = context.CreateBatchWrite<UsageItem>();
context member here has DynamoDBContext type.

In this case there's Usage property present on both UsageItem class and its parent class. The type differs as in your example with Addresses property and we also use new keyword in the child class.

I hope this information helps with issue resolution.

Regards,
Yura

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