Problem querying a DynamoDB GSI Composite key using .NET Core Object Persistence Model - asp.net

Question

I want to query a GSI composite key using OPM. I followed the documentation example the link for which is as follows:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBContext.QueryScan.html
However I am facing two issues:
1). The same code as mentioned in the above example is throwing errors for me. I believe inside the context.QueryAsync(Hask Key target value, Operator.Between, RangeKey lower target value, RangeKey higher target value) is the syntax.
But I get error as follows for the last two range key target values:
Error CS1503 Argument 3: cannot convert from 'string' to 'System.Collections.Generic.IEnumerable'
2). How do I set the query to target a GSI instead of Normal Composite Keys.
For instructing the query to target GSI I googled and found the below code snippet : DynamoDBOperationConfig(). But how do I incorporate it into the final Context.QueryAsync method?
using Amazon.DynamoDBv2.DataModel;
using System;
using System.Collections.Generic;
using System.Text;
namespace EDCPA.Core.Models
{
[DynamoDBTable("EDCBUILDDATA1")]
public class AARes
{
[DynamoDBGlobalSecondaryIndexHashKey("PN-FGD-Index")]
public string ProjectName { get; set; }
[DynamoDBGlobalSecondaryIndexRangeKey("PN-FGD-Index")]
public string FileGeneratedDate { get; set; }
public string VehicleName { get; set; }
public string FileNameKey { get; set; }
[DynamoDBHashKey]
public string Id { get; set; }
[DynamoDBRangeKey]
public string createdTimeStamp { get; set; }
}
}
using Amazon.DynamoDBv2.DataModel;
using System;
using System.Collections.Generic;
using System.Text;
namespace EDCPA.Core.Models
{
[DynamoDBTable("EDCBUILDDATA1")]
public class AAReq
{
public string FileGeneratedFromDate { get; set; }
public string FileGeneratedToDate { get; set; }
public string ProjectName { get; set; }
public string VehicleName { get; set; }
[DynamoDBHashKey]
public string Id { get; set; }
[DynamoDBRangeKey]
public string createdTimeStamp { get; set; }
}
}
public async Task<IActionResult> AARequestAsync([FromBody] AAReq req)
{
try
{
headers = HeaderCollections.TryRetrieveToken(Request);
AmazonDynamoDBClient client = new AmazonDynamoDBClient(new StoredProfileAWSCredentials(),
RegionEndpoint.APSouth1);
DynamoDBContext context = new DynamoDBContext(client);
DynamoDBOperationConfig indexHashRangeOpConfig = new DynamoDBOperationConfig()
{
IndexName = "PN-FGD-Index",
ConsistentRead = false,
};
IEnumerable<AARes> fileKeys = await
context.QueryAsync<AARes>(req.ProjectName, QueryOperator.Between, req.FileGeneratedFromDate, req.FileGeneratedToDate);
Console.WriteLine("\nFindRepliesInLast15Days: Printing result.....");
foreach (AARes r in fileKeys)
Console.WriteLine("{0}\t{1}\t{2}\t{3}", r.FileNameKey, r.VehicleName);
1). What am I doing wrong inside the context.QueryAsync statement?
2). Also,How do I incorporate the DynamoDBOperationConfig indexHashRangeOpConfig into my final query statement?

Answer 1

Here is the solution to my problems above:
List<Dashboardreq> list =
await context.QueryAsync<Dashboardreq>(req.ProjectName, QueryOperator.Between, new string[] {
req.FileGeneratedFromDate+" " + Constants.DayBeginTime,
req.FileGeneratedToDate+" " + Constants.DayEndTime
}, indexHashRangeOpConfig).GetRemainingAsync();