Unable to add SQS queue as an event source in C#

Describe the bug Adding an SQS queue as an event source to a lambda function throws an exception with message “Parameter count mismatch.” in C#.

To Reproduce

This example adds the queue as an event source after the function object is created, but I receive the same error if I try to add the queue as an event source at the time of function creation via the “Events” property.

Code:

var app = new App(new AppProps());

var stack = new Stack(app, "MyTestStack", new StackProps());

var function = new Function(stack, "MyTestLambdaFunction", new FunctionProps
{
    Runtime = Runtime.DotNetCore21,
    Handler = "MyTestAssembly::MyTestClass::Handler",
    Code = new CfnParametersCode(new CfnParametersCodeProps
    {
        BucketNameParam = new CfnParameter(stack, "BucketNameParameter", new CfnParameterProps{Type="String"}),
        ObjectKeyParam = new CfnParameter(stack, "ObjectKeyParameter", new CfnParameterProps{Type="String"})
    }),
    FunctionName = "MyTestFunction"
}); 

var queue = new Queue(stack, "MyTestQueue", new QueueProps
{
    QueueName = "MyTestQueue"
});
            
function.AddEventSource(new SqsEventSource(queue, new SqsEventSourceProps()));

Stacktrace:

An unhandled exception of type 'Amazon.JSII.Runtime.JsiiException' occurred in Amazon.JSII.Runtime.dll: 'Amazon.JSII.Runtime.JsiiException: Amazon.JSII.Runtime.JsiiException: System.Reflection.TargetParameterCountException: Parameter count mismatch.
   at System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Amazon.JSII.Runtime.CallbackExtensions.InvokeMethod(InvokeRequest request, IReferenceMap referenceMap)
   at Amazon.JSII.Runtime.CallbackExtensions.InvokeCallback(Callback callback, IReferenceMap referenceMap, IFrameworkToJsiiConverter converter, String& error)
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Deputy.DeputyBase.<InvokeMethodCore>g__GetResult|18_0[T](<>c__DisplayClass18_0`1& )
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeMethodCore[T](JsiiMethodAttribute methodAttribute, Object[] arguments, Func`3 beginFunc, Func`3 invokeFunc)
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Deputy.DeputyBase.<InvokeMethodCore>g__GetResult|18_0[T](<>c__DisplayClass18_0`1& )
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeMethodCore[T](JsiiMethodAttribute methodAttribute, Object[] arguments, Func`3 beginFunc, Func`3 invokeFunc)
   at Amazon.CDK.AWS.Lambda.EventSources.SqsEventSource.Bind(IIFunction target)'
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Deputy.DeputyBase.<InvokeMethodCore>g__GetResult|18_0[T](<>c__DisplayClass18_0`1& )
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeMethodCore[T](JsiiMethodAttribute methodAttribute, Object[] arguments, Func`3 beginFunc, Func`3 invokeFunc)
   at Amazon.CDK.AWS.Lambda.FunctionBase.AddEventSource(IIEventSource source)

Expected behavior The SQS queue is added as an event source to the lambda function.

Version:

• OSX
• C#
• 0.33

[carlosrfernandez]

Any updates on this? It happens on the latest preview as well

[sveinhelge]

Workaround:

someFunction.AddEventSourceMapping("SomeId", new EventSourceMappingProps
            {
                BatchSize = 10,
                Enabled = true,
                EventSourceArn = someQueue.QueueArn,
                Target = someFunction
            });