AWS SDK Version 3 for .NET
API Reference

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Identifies a poll-based event source for a Lambda function. It can be either an Amazon Kinesis or DynamoDB stream, or an Amazon SQS queue. AWS Lambda invokes the specified function when records are posted to the event source.

This association between a poll-based source and a Lambda function is called the event source mapping.

You provide mapping information (for example, which stream or SQS queue to read from and which Lambda function to invoke) in the request body.

Amazon Kinesis or DynamoDB stream event sources can be associated with multiple AWS Lambda functions and a given Lambda function can be associated with multiple AWS event sources. For Amazon SQS, you can configure multiple queues as event sources for a single Lambda function, but an SQS queue can be mapped only to a single Lambda function.

If you are using versioning, you can specify a specific function version or an alias via the function name parameter. For more information about versioning, see AWS Lambda Function Versioning and Aliases.

This operation requires permission for the lambda:CreateEventSourceMapping action.


For .NET Core, PCL and Unity this operation is only available in asynchronous form. Please refer to CreateEventSourceMappingAsync.

Namespace: Amazon.Lambda
Assembly: AWSSDK.Lambda.dll
Version: 3.x.y.z


public virtual CreateEventSourceMappingResponse CreateEventSourceMapping(
         CreateEventSourceMappingRequest request
Type: Amazon.Lambda.Model.CreateEventSourceMappingRequest

Container for the necessary parameters to execute the CreateEventSourceMapping service method.

Return Value
The response from the CreateEventSourceMapping service method, as returned by Lambda.


InvalidParameterValueException One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda to assume in the CreateFunction or the UpdateFunctionConfiguration API, that AWS Lambda is unable to assume you will get this exception.
ResourceConflictException The resource already exists.
ResourceNotFoundException The resource (for example, a Lambda function or access policy statement) specified in the request does not exist.
ServiceException The AWS Lambda service encountered an internal error.

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

Supported Versions: 4.6 and above
Supported Platforms: Android, iOS, Standalone

See Also