It is just a wrapper for java version, provided by AWS.

1. Download and configure AWS CLI V2
2. Download DynamoDBLocal
3. Put content of the folder in SolutionRootDir/dynamodb_local_latest or use environment variable, for example DYNAMODB_LOCAL_LATEST_COMMON_PATH

1. Example (also see DynamoDbLocalInMemoryBaseFixture and DynamoDbLocalInMemoryFixture)

   public class DynamoDbLocalInMemoryFixtureTest: IClassFixture<DynamoDbLocalInMemoryFixture>
   {
       private const string TableName = "Example";
       private readonly DynamoDbLocalInMemoryFixture _dynamoDbLocalInMemoryFixture;
   
       public DynamoDbLocalInMemoryFixtureTest(DynamoDbLocalInMemoryFixture dynamoDbLocalInMemoryFixture)
       {
           _dynamoDbLocalInMemoryFixture = dynamoDbLocalInMemoryFixture;
           _dynamoDbLocalInMemoryFixture.Create();
       }
   
       [Fact]
       public async Task CreateTable_And_PutOneItem_In_TheTable_Using_DynamoDBClient()
       {
           await _dynamoDbLocalInMemoryFixture.SetupAsync();
   
           var dynamoDbClient = _dynamoDbLocalInMemoryFixture.DynamoDbClient;
           
           var putItemResponse = await dynamoDbClient.PutItemAsync(new PutItemRequest
           {
               TableName = TableName,
               Item = GetTestItem()
           });
   
           Assert.Equal(HttpStatusCode.OK, putItemResponse.HttpStatusCode);
   
           var scanResponse = await dynamoDbClient.ScanAsync(new ScanRequest
           {
               TableName = TableName
           });
   
           Assert.Equal(HttpStatusCode.OK, scanResponse.HttpStatusCode);
           Assert.Equal(1, scanResponse.Items.Count);
   
           await _dynamoDbLocalInMemoryFixture.DestroyAsync();
       }
       
       private Dictionary<string, AttributeValue> GetTestItem()
       {
           Dictionary<string, AttributeValue> attributes = new ();
           attributes["Id"] = new AttributeValue { S = Guid.NewGuid().ToString() };
           attributes["CreatedDate"] = new AttributeValue { S = DateTimeOffset.UtcNow.ToString() };
           attributes["Content"] = new AttributeValue { S = "aws_dynamodb_local_test" };
           return attributes;
       }
   }

2. Make sure to always kill a running process at the end and first verify, on any error, there is no active dynamodb java processes (task manager)

   dynamoDbProcess.Kill(true);

3. Make sure DynamoDBLocal and DynamoDBClient both are using the same port, otherwise the client may not be able to find the runnig java process. Read more...

4. Alternative usage:

   private void CreateTable_UsingCommand()
   {
       // create using environment variable
       using var dynamoDbProcess = DynamoDbLocalWrapper.CreateInMemoryDbProcess(environmentVariableName: "DYNAMODB_LOCAL_LATEST_COMMON_PATH");
   
       // or put dynamodb_local_latest folder inside the solution root folder
       // using var dynamoDbProcess = DynamoDbLocalWrapper.CreateInMemoryDbProcess();
   
       dynamoDbProcess.Start();
   
       var input = @"aws dynamodb create-table --table-name Example --attribute-definitions AttributeName=Id,AttributeType=S AttributeName=CreatedDate,AttributeType=S --key-schema AttributeName=Id,KeyType=HASH AttributeName=CreatedDate,KeyType=RANGE --provisioned-throughput ReadCapacityUnits=10,WriteCapacityUnits=5 --endpoint-url http://localhost:8000 --region test";
       using var createTableProcess = DynamoDBLocalWrapper.CreateProcess(input);
       createTableProcess.Start();
       createTableProcess.Kill(true);
   
       // do something else
   
       dynamoDbProcess.Kill(true);
   }

5. SharedDb:

   private void CreateSharedDb()
   {
       // create using environment variable
       using var dynamoDbProcess = DynamoDbLocalWrapper.CreateSharedDbProcess(environmentVariableName: "DYNAMODB_LOCAL_LATEST_COMMON_PATH");
   
       // or put dynamodb_local_latest folder inside the solution root folder
       // using var dynamoDbProcess = DynamoDbLocalWrapper.CreateSharedDbProcess();
   
       dynamoDbProcess.Start();
   
       using var dynamoDbClient = DynamoDbLocalWrapper.CreateClient();
   
       // do something
   
       dynamoDbProcess.Kill(true);
   }