AWS SDK Version 3 for .NET
API Reference

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Container for the parameters to the AddPermission operation. Adds a permission to the resource policy associated with the specified AWS Lambda function. You use resource policies to grant permissions to event sources that use push model. In a push model, event sources (such as Amazon S3 and custom applications) invoke your Lambda function. Each permission you add to the resource policy allows an event source, permission to invoke the Lambda function.

For information about the push model, see Lambda Functions.

If you are using versioning, the permissions you add are specific to the Lambda function version or alias you specify in the AddPermission request via the Qualifier parameter. For more information about versioning, see AWS Lambda Function Versioning and Aliases.

This operation requires permission for the lambda:AddPermission action.

Inheritance Hierarchy


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


public class AddPermissionRequest : AmazonLambdaRequest

The AddPermissionRequest type exposes the following members


Public Method AddPermissionRequest()


Public Property Action System.String

Gets and sets the property Action.

The AWS Lambda action you want to allow in this statement. Each Lambda action is a string starting with lambda: followed by the API name . For example, lambda:CreateFunction. You can use wildcard (lambda:*) to grant permission for all AWS Lambda actions.

Public Property EventSourceToken System.String

Gets and sets the property EventSourceToken.

A unique token that must be supplied by the principal invoking the function. This is currently only used for Alexa Smart Home functions.

Public Property FunctionName System.String

Gets and sets the property FunctionName.

Name of the Lambda function whose resource policy you are updating by adding a new permission.

You can specify a function name (for example, Thumbnail) or you can specify Amazon Resource Name (ARN) of the function (for example, arn:aws:lambda:us-west-2:account-id:function:ThumbNail). AWS Lambda also allows you to specify partial ARN (for example, account-id:Thumbnail). Note that the length constraint applies only to the ARN. If you specify only the function name, it is limited to 64 characters in length.

Public Property Principal System.String

Gets and sets the property Principal.

The principal who is getting this permission. It can be Amazon S3 service Principal ( if you want Amazon S3 to invoke the function, an AWS account ID if you are granting cross-account permission, or any valid AWS service principal such as For example, you might want to allow a custom application in another AWS account to push events to AWS Lambda by invoking your function.

Public Property Qualifier System.String

Gets and sets the property Qualifier.

You can use this optional query parameter to describe a qualified ARN using a function version or an alias name. The permission will then apply to the specific qualified ARN. For example, if you specify function version 2 as the qualifier, then permission applies only when request is made using qualified function ARN:


If you specify an alias name, for example PROD, then the permission is valid only for requests made using the alias ARN:


If the qualifier is not specified, the permission is valid only when requests is made using unqualified function ARN.


Public Property RevisionId System.String

Gets and sets the property RevisionId.

An optional value you can use to ensure you are updating the latest update of the function version or alias. If the RevisionID you pass doesn't match the latest RevisionId of the function or alias, it will fail with an error message, advising you to retrieve the latest function version or alias RevisionID using either or .

Public Property SourceAccount System.String

Gets and sets the property SourceAccount.

This parameter is used for S3 and SES. The AWS account ID (without a hyphen) of the source owner. For example, if the SourceArn identifies a bucket, then this is the bucket owner's account ID. You can use this additional condition to ensure the bucket you specify is owned by a specific account (it is possible the bucket owner deleted the bucket and some other AWS account created the bucket). You can also use this condition to specify all sources (that is, you don't specify the SourceArn) owned by a specific account.

Public Property SourceArn System.String

Gets and sets the property SourceArn.

This is optional; however, when granting permission to invoke your function, you should specify this field with the Amazon Resource Name (ARN) as its value. This ensures that only events generated from the specified source can invoke the function.

If you add a permission without providing the source ARN, any AWS account that creates a mapping to your function ARN can send events to invoke your Lambda function.

Public Property StatementId System.String

Gets and sets the property StatementId.

A unique statement identifier.


This example adds a permission for an S3 bucket to invoke a Lambda function.


var response = client.AddPermission(new AddPermissionRequest 
    Action = "lambda:InvokeFunction",
    FunctionName = "MyFunction",
    Principal = "",
    SourceAccount = "123456789012",
    SourceArn = "arn:aws:s3:::examplebucket/*",
    StatementId = "ID-1"

string statement = response.Statement;


Version Information

.NET Standard:
Supported in: 1.3

.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