The AWS Mobile SDK for.NET and Xamarin also allows you to use most of the AWS services supported by the AWS SDK for.NET. The AWS services specific to mobile development are explained in this developer guide. Note: this article uses the old project.json format of.net core, i havent gotten around to updating this yet. In this article I am going to go through step by step on how to get started with Visual Studio Code and creating your first C# based AWS Lambda function out of it. Extension for Visual Studio - The AWS Toolkit for Visual Studio is an extension for Microsoft Visual Studio on Windows that makes it easier for developers to develop, debug, and deploy.NET applications using Amazon Web Services. The SDK can be downloaded from NuGet or installed using the MSI package, which also includes the AWS Toolkit for Microsoft Visual Studio 2013 and 2015.
In this post I’m doing a deep dive of AWS DynamoDB database and using the available APIs with .Net Core. https://browntelevision102.weebly.com/acdsee-photo-studio-for-mac-beta.html. For more general information on DynamoDB, refer to this post:
The code shown here is from another post where I created a complete serverless web application in AWS using DynamoDB. Below is a link to that post as well as the github project site.
https://github….tbd
To work with the DynamoDB in .Net we need the AWS SDK installed on Visual Studio. The SDK provides a few different ways to communicate with DynamoDB. The diagram below shows an overview of these approaches. The actual communication between the SDK and DynamoDB database is done over HTTPS.
Studio manager 9.2 for mac. Interfaces
The application works with DynamoDB through the 3 different interfaces shown in the diagram. Each interface has different pros/cons to be used for different use cases.
Low-Level API
At the lowest level of the DynamoDB SDK we see the Low-Level API which contains the actual HTTPS request/response handling. Add extension to visual studio for mac. This should not be confused with the Low-Level Interface which is implemented with the AmazonDynamoDB client class. The Low-Level API is where the actual communication takes place using JSON format and the API predefined data types. Some of these data type descriptors are listed below. For binary data, it is encoded in Base64 format (RFC 4648).
As the low level API is using HTTPS, errors are usually responses with HTTP 400 or 500 codes. For complete list of error codes that can be return, refer to this article:
Implementing the Interfaces
Refer to the Serverless AWS app project post for a working example that uses the different interfaces in .Net. That post is here:
In the Repository.cs file we have implemented the 3 different interface approaches for creating a record and then reading it. The sample code shows this below. Note that for the Low Level interface the data conversion had to be done whereas on the other two model based approaches the data conversion was ignored.
In the same Repository.cs file we also have some sample code that dives deeper into the Object Persistence approach. First we define the table using the Widget class. That is shown below:
To interact with the DynamoDB table we use the DynamoDBContext class which is declared in the Repository class. This context model lets use interact with the tables including CRUD operations as well as running Queries and Scans. Some of the methods it provides are:
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Optimistic Locking
To avoid updates to stale record copies the DynamoDBTable attribute allows optimistic locking by defining a version number field. This is done with the DynamoDBVersion attribute. With this version number we can determine older copies. The AWS SDK will perform the lock (its more of a programmatic lock from the .Net code instead of directly in DynamoDB, which does not have locking features).
How To Get C++ On Visual Studio For Mac![]()
In the Repository.cs class we demonstrate the following features offered through the Object Persistence model.
Please refer to the github project site to see the complete file and these examples. The following post explains that github project and how it works.
References
AWS SDK .NET Reference Document
https://docs.aws.amazon.com/sdkfornet/v3/apidocs/
DynamoDB API Blog
https://aws.amazon.com/blogs/developer/dynamodb-apis/
Programming with DynamoDB
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.html Visual Studio Community For Mac
Working with DynamoDB Object Persistence Model in .Net
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DotNetSDKHighLevel.html Comments are closed.
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