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Asynchronous API for .NET 4.5, Windows Store,
and Windows Phone 8
The AWS SDK for .NET uses the new task-based asynchronous pattern for .NET 4.5, Windows Store,
and Windows Phone 8.You can use the async and await keywords to perform and manage asynchronous
operations for all AWS products without blocking.
To learn more about the task-based asynchronous pattern, see Task-based Asynchronous Pattern (TAP)
on MSDN.
Asynchronous API for .NET 3.5
The AWS SDK for .NET supports asynchronous (async) versions of most of the method calls exposed
by the .NET client classes.The async methods enable you to call AWS services without having your code
block on the response from the service. For example, you could make a request to write data to Amazon
S3 or DynamoDB and then have your code continue to do other work while AWS processes the requests.
Syntax of Async Request Methods
There are two phases to making an asynchronous request to an AWS service.The first is to call the Begin
method for the request. This method initiates the asynchronous operation. Then, after some period of
time, you would call the corresponding End method.This method retrieves the response from the service
and also provides an opportunity to handle exceptions that might have occurred during the operation.
Note
It is not required that you call the End method. Assuming that no errors are encountered, the
asynchronous operation will complete whether or not you call End.
Begin Method Syntax
In addition to taking a request object parameter, such as PutItemRequest, the async Begin methods
take two additional parameters: a callback function, and a state object. Instead of returning a service re-
sponse object, the Begin methods return a result of type IAsyncResult. For the definition of this type,
go to the MSDN documentation.
Synchronous Method
PutItemResponse PutItem(
PutItemRequest putItemRequest
)
Asynchronous Method
IAsyncResult BeginPutItem(
GetSessionTokenRequest getSessionTokenRequest,
AsyncCallback callback,
Object state
)
AsyncCallback callback
The callback function is called when the asynchronous operation completes.When the function is called,
it receives a single parameter of type IAsyncResult. The callback function has the following signature.
Version v2.0.0
17
AWS SDK for .NET Developer Guide
Asynchronous API for .NET 4.5,Windows Store, and
Windows Phone 8
- AWS SDK for .NET 1
- Table of Contents 3
- AWS SDK for .NET Developer 5
- About Amazon Web Services 6
- To sign up for an AWS account 7
- Install the AWS SDK for .NET 8
- Start a New Project 9
- Application (p. 8) 11
- Programming with the AWS SDK 12
- Configuring AWS Credentials 13
- Using the SDK Store 14
- Using a Credentials File 14
- Specifying a Profile 15
- Using Proxy Credentials 16
- AWS Region Selection 20
- Asynchronous API for .NET 3.5 21
- Examples 22
- No Callback Specified 23
- Simple Callback 23
- Callback with Client 23
- Callback with State Object 24
- Complete Sample 25
- Removal of SecureString 29
- Breaking Changes 29
- Amazon DynamoDB 30
- Amazon EC2 30
- Amazon Redshift 30
- Amazon S3 30
- Configuring the AWS Region 31
- Response and Result Classes 31
- AWS SDK for Windows RT 32
- AWS SDK for Windows Phone 8 32
- Installation 33
- NuGet from Solution Explorer 34
- NuGet Package Manager Console 34
- Version v2.0.0 35
- Web.config Options 38
- Security Considerations 39
- Creating a Security Group 42
- Enumerating Your Key Pairs 44
- Launching an EC2 Instance 46
- Create an IAM Role 53
- Overview 55
- Prerequisites 56
- Conclusion 62
- Create an Amazon SQS Client 63
- Create an Amazon SQS Queue 63
- Amazon SQS Queue URLs 64
- Send an Amazon SQS Message 64
- Important 65
- Adding Resource Record Sets 67
- To run this example 68
- To create a hosted zone 70
- To monitor update status 71
- Additional Resources 72
- Document History 73
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